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From: Boris Brezillon <boris.brezillon@collabora.com>
To: dri-devel@lists.freedesktop.org
Subject: [PATCH v2 01/21] drm: Stop including drm_bridge.h from drm_crtc.h
Date: Mon, 26 Aug 2019 17:26:29 +0200
Message-Id: <20190826152649.13820-2-boris.brezillon@collabora.com>
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Cc: Nikita Yushchenko <nikita.yoush@cogentembedded.com>,
 Jernej Skrabec <jernej.skrabec@siol.net>,
 Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
 Neil Armstrong <narmstrong@baylibre.com>,
 Andrey Smirnov <andrew.smirnov@gmail.com>, Jonas Karlman <jonas@kwiboo.se>,
 Seung-Woo Kim <sw0312.kim@samsung.com>,
 Kyungmin Park <kyungmin.park@samsung.com>,
 Thierry Reding <thierry.reding@gmail.com>,
 Chris Healy <Chris.Healy@zii.aero>,
 Boris Brezillon <boris.brezillon@collabora.com>, kernel@collabora.com,
 Sam Ravnborg <sam@ravnborg.org>
Errors-To: dri-devel-bounces@lists.freedesktop.org
Sender: "dri-devel" <dri-devel-bounces@lists.freedesktop.org>

We are about to add a drm_bridge_state that inherits from
drm_private_state which is defined in drm_atomic.h. Problem is,
drm_atomic.h includes drm_crtc.h which in turn includes drm_bridge.h,
leading to "drm_private_state has incomplete type" error.

Let's force all users of the drm_bridge API to explicitly include
drm_bridge.h.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
---
Changes in v2:
* Fix inclusion order (Sam Ravnog)
* Add Sam's R-b
---
 drivers/gpu/drm/arc/arcpgu_hdmi.c                        | 1 +
 drivers/gpu/drm/bridge/analogix-anx78xx.c                | 1 +
 drivers/gpu/drm/bridge/analogix/analogix_dp_core.c       | 1 +
 drivers/gpu/drm/bridge/dumb-vga-dac.c                    | 1 +
 drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c | 1 +
 drivers/gpu/drm/bridge/nxp-ptn3460.c                     | 1 +
 drivers/gpu/drm/bridge/panel.c                           | 1 +
 drivers/gpu/drm/bridge/parade-ps8622.c                   | 1 +
 drivers/gpu/drm/bridge/sii902x.c                         | 1 +
 drivers/gpu/drm/bridge/sii9234.c                         | 1 +
 drivers/gpu/drm/bridge/sil-sii8620.c                     | 1 +
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c                | 1 +
 drivers/gpu/drm/bridge/tc358764.c                        | 1 +
 drivers/gpu/drm/bridge/tc358767.c                        | 1 +
 drivers/gpu/drm/bridge/ti-sn65dsi86.c                    | 1 +
 drivers/gpu/drm/bridge/ti-tfp410.c                       | 1 +
 drivers/gpu/drm/drm_atomic_helper.c                      | 1 +
 drivers/gpu/drm/drm_crtc_helper.c                        | 1 +
 drivers/gpu/drm/drm_encoder.c                            | 1 +
 drivers/gpu/drm/drm_probe_helper.c                       | 1 +
 drivers/gpu/drm/drm_simple_kms_helper.c                  | 1 +
 drivers/gpu/drm/exynos/exynos_dp.c                       | 1 +
 drivers/gpu/drm/exynos/exynos_drm_dsi.c                  | 1 +
 drivers/gpu/drm/exynos/exynos_drm_mic.c                  | 1 +
 drivers/gpu/drm/exynos/exynos_hdmi.c                     | 1 +
 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c                | 1 +
 drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c             | 1 +
 drivers/gpu/drm/i2c/tda998x_drv.c                        | 1 +
 drivers/gpu/drm/imx/imx-ldb.c                            | 1 +
 drivers/gpu/drm/imx/parallel-display.c                   | 1 +
 drivers/gpu/drm/ingenic/ingenic-drm.c                    | 1 +
 drivers/gpu/drm/mediatek/mtk_dpi.c                       | 1 +
 drivers/gpu/drm/mediatek/mtk_dsi.c                       | 1 +
 drivers/gpu/drm/mediatek/mtk_hdmi.c                      | 1 +
 drivers/gpu/drm/msm/dsi/dsi.h                            | 1 +
 drivers/gpu/drm/msm/edp/edp.h                            | 1 +
 drivers/gpu/drm/msm/hdmi/hdmi.h                          | 2 ++
 drivers/gpu/drm/omapdrm/dss/output.c                     | 1 +
 drivers/gpu/drm/omapdrm/omap_drv.c                       | 1 +
 drivers/gpu/drm/omapdrm/omap_encoder.c                   | 1 +
 drivers/gpu/drm/rcar-du/rcar_du_encoder.c                | 1 +
 drivers/gpu/drm/rockchip/rockchip_lvds.c                 | 1 +
 drivers/gpu/drm/rockchip/rockchip_rgb.c                  | 1 +
 drivers/gpu/drm/sti/sti_dvo.c                            | 1 +
 drivers/gpu/drm/sti/sti_hda.c                            | 1 +
 drivers/gpu/drm/sti/sti_hdmi.c                           | 1 +
 drivers/gpu/drm/sun4i/sun4i_lvds.c                       | 1 +
 drivers/gpu/drm/sun4i/sun4i_rgb.c                        | 1 +
 drivers/gpu/drm/sun4i/sun4i_tcon.c                       | 1 +
 drivers/gpu/drm/tilcdc/tilcdc_external.c                 | 1 +
 drivers/gpu/drm/vc4/vc4_dsi.c                            | 1 +
 include/drm/drm_crtc.h                                   | 1 -
 52 files changed, 52 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/arc/arcpgu_hdmi.c b/drivers/gpu/drm/arc/arcpgu_hdmi.c
index 98aac743cc26..8fd7094beece 100644
--- a/drivers/gpu/drm/arc/arcpgu_hdmi.c
+++ b/drivers/gpu/drm/arc/arcpgu_hdmi.c
@@ -5,6 +5,7 @@
  * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
  */
 
+#include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_encoder.h>
 #include <drm/drm_device.h>
diff --git a/drivers/gpu/drm/bridge/analogix-anx78xx.c b/drivers/gpu/drm/bridge/analogix-anx78xx.c
index 3c7cc5af735c..e3f4fd2a5ad4 100644
--- a/drivers/gpu/drm/bridge/analogix-anx78xx.c
+++ b/drivers/gpu/drm/bridge/analogix-anx78xx.c
@@ -19,6 +19,7 @@
 #include <linux/types.h>
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_dp_helper.h>
 #include <drm/drm_edid.h>
diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index 22885dceaa17..bb411fe52ae8 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -21,6 +21,7 @@
 #include <drm/bridge/analogix_dp.h>
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_device.h>
 #include <drm/drm_panel.h>
diff --git a/drivers/gpu/drm/bridge/dumb-vga-dac.c b/drivers/gpu/drm/bridge/dumb-vga-dac.c
index 7aa789c35882..cc33dc411b9e 100644
--- a/drivers/gpu/drm/bridge/dumb-vga-dac.c
+++ b/drivers/gpu/drm/bridge/dumb-vga-dac.c
@@ -12,6 +12,7 @@
 #include <linux/regulator/consumer.h>
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_print.h>
 #include <drm/drm_probe_helper.h>
diff --git a/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c b/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c
index 6e81e5db57f2..e8a49f6146c6 100644
--- a/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c
+++ b/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c
@@ -25,6 +25,7 @@
 
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_print.h>
 #include <drm/drm_probe_helper.h>
diff --git a/drivers/gpu/drm/bridge/nxp-ptn3460.c b/drivers/gpu/drm/bridge/nxp-ptn3460.c
index d4a1cc5052c3..57ff01339559 100644
--- a/drivers/gpu/drm/bridge/nxp-ptn3460.c
+++ b/drivers/gpu/drm/bridge/nxp-ptn3460.c
@@ -11,6 +11,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_of.h>
diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
index b12ae3a4c5f1..6cffeb4a42f2 100644
--- a/drivers/gpu/drm/bridge/panel.c
+++ b/drivers/gpu/drm/bridge/panel.c
@@ -5,6 +5,7 @@
  */
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_connector.h>
 #include <drm/drm_encoder.h>
 #include <drm/drm_modeset_helper_vtables.h>
diff --git a/drivers/gpu/drm/bridge/parade-ps8622.c b/drivers/gpu/drm/bridge/parade-ps8622.c
index 93c68e2e9484..b7a72dfdcac3 100644
--- a/drivers/gpu/drm/bridge/parade-ps8622.c
+++ b/drivers/gpu/drm/bridge/parade-ps8622.c
@@ -17,6 +17,7 @@
 #include <linux/regulator/consumer.h>
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_of.h>
 #include <drm/drm_panel.h>
diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
index 38f75ac580df..b70e8c5cf2e1 100644
--- a/drivers/gpu/drm/bridge/sii902x.c
+++ b/drivers/gpu/drm/bridge/sii902x.c
@@ -20,6 +20,7 @@
 #include <linux/clk.h>
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_print.h>
diff --git a/drivers/gpu/drm/bridge/sii9234.c b/drivers/gpu/drm/bridge/sii9234.c
index 25d4ad8c7ad6..ad00d841ed9e 100644
--- a/drivers/gpu/drm/bridge/sii9234.c
+++ b/drivers/gpu/drm/bridge/sii9234.c
@@ -13,6 +13,7 @@
  *    Dharam Kumar <dharam.kr@samsung.com>
  */
 #include <drm/bridge/mhl.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_edid.h>
 
diff --git a/drivers/gpu/drm/bridge/sil-sii8620.c b/drivers/gpu/drm/bridge/sil-sii8620.c
index bd3165ee5354..14643923a721 100644
--- a/drivers/gpu/drm/bridge/sil-sii8620.c
+++ b/drivers/gpu/drm/bridge/sil-sii8620.c
@@ -9,6 +9,7 @@
 #include <asm/unaligned.h>
 
 #include <drm/bridge/mhl.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_encoder.h>
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 355877f0ad7a..bd65d0479683 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -26,6 +26,7 @@
 
 #include <drm/bridge/dw_hdmi.h>
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_encoder_slave.h>
 #include <drm/drm_of.h>
diff --git a/drivers/gpu/drm/bridge/tc358764.c b/drivers/gpu/drm/bridge/tc358764.c
index 170f162ffa55..db298f550a5a 100644
--- a/drivers/gpu/drm/bridge/tc358764.c
+++ b/drivers/gpu/drm/bridge/tc358764.c
@@ -16,6 +16,7 @@
 #include <video/mipi_display.h>
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_mipi_dsi.h>
diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index cebc8e620820..51664a2df731 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -26,6 +26,7 @@
 #include <linux/slab.h>
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_dp_helper.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_of.h>
diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index 0a580957c8cf..43abf01ebd4c 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -17,6 +17,7 @@
 
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_dp_helper.h>
 #include <drm/drm_mipi_dsi.h>
 #include <drm/drm_of.h>
diff --git a/drivers/gpu/drm/bridge/ti-tfp410.c b/drivers/gpu/drm/bridge/ti-tfp410.c
index 61cc2354ef1b..aa3198dc9903 100644
--- a/drivers/gpu/drm/bridge/ti-tfp410.c
+++ b/drivers/gpu/drm/bridge/ti-tfp410.c
@@ -14,6 +14,7 @@
 #include <linux/platform_device.h>
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_print.h>
 #include <drm/drm_probe_helper.h>
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index aa16ea17ff9b..4706439fb490 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -30,6 +30,7 @@
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_atomic_uapi.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_damage_helper.h>
 #include <drm/drm_device.h>
 #include <drm/drm_plane_helper.h>
diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index 6dd49a60deac..fa3694836c22 100644
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -36,6 +36,7 @@
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_atomic_uapi.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_drv.h>
diff --git a/drivers/gpu/drm/drm_encoder.c b/drivers/gpu/drm/drm_encoder.c
index 7fb47b7b8b44..80d88a55302e 100644
--- a/drivers/gpu/drm/drm_encoder.c
+++ b/drivers/gpu/drm/drm_encoder.c
@@ -22,6 +22,7 @@
 
 #include <linux/export.h>
 
+#include <drm/drm_bridge.h>
 #include <drm/drm_device.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_encoder.h>
diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
index ef2c468205a2..351cbc40f0f8 100644
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -32,6 +32,7 @@
 #include <linux/export.h>
 #include <linux/moduleparam.h>
 
+#include <drm/drm_bridge.h>
 #include <drm/drm_client.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_edid.h>
diff --git a/drivers/gpu/drm/drm_simple_kms_helper.c b/drivers/gpu/drm/drm_simple_kms_helper.c
index b11910f14c46..046055719245 100644
--- a/drivers/gpu/drm/drm_simple_kms_helper.c
+++ b/drivers/gpu/drm/drm_simple_kms_helper.c
@@ -8,6 +8,7 @@
 
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_plane_helper.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/drm_simple_kms_helper.h>
diff --git a/drivers/gpu/drm/exynos/exynos_dp.c b/drivers/gpu/drm/exynos/exynos_dp.c
index 3a0f0ba8c63a..1e6aa24bf45e 100644
--- a/drivers/gpu/drm/exynos/exynos_dp.c
+++ b/drivers/gpu/drm/exynos/exynos_dp.c
@@ -19,6 +19,7 @@
 
 #include <drm/bridge/analogix_dp.h>
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_of.h>
 #include <drm/drm_panel.h>
diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index 6926cee91b36..72726f2c7a9f 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -24,6 +24,7 @@
 #include <video/videomode.h>
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_mipi_dsi.h>
 #include <drm/drm_panel.h>
diff --git a/drivers/gpu/drm/exynos/exynos_drm_mic.c b/drivers/gpu/drm/exynos/exynos_drm_mic.c
index b78e8c5ba553..f41d75923557 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_mic.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_mic.c
@@ -21,6 +21,7 @@
 #include <video/of_videomode.h>
 #include <video/videomode.h>
 
+#include <drm/drm_bridge.h>
 #include <drm/drm_encoder.h>
 #include <drm/drm_print.h>
 
diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
index bc1565f1822a..2e3795c2c794 100644
--- a/drivers/gpu/drm/exynos/exynos_hdmi.c
+++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
@@ -34,6 +34,7 @@
 #include <media/cec-notifier.h>
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_print.h>
 #include <drm/drm_probe_helper.h>
diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
index a92fd6c70b09..82c972e9c024 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
@@ -9,6 +9,7 @@
 #include <linux/of_graph.h>
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_of.h>
 #include <drm/drm_panel.h>
 #include <drm/drm_probe_helper.h>
diff --git a/drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c b/drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c
index 5bf8138941de..bdcf9c6ae9e9 100644
--- a/drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c
+++ b/drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c
@@ -18,6 +18,7 @@
 #include <linux/platform_device.h>
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_device.h>
 #include <drm/drm_encoder_slave.h>
 #include <drm/drm_mipi_dsi.h>
diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index 84c6d4c91c65..6c218bace2ce 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -14,6 +14,7 @@
 #include <sound/hdmi-codec.h>
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_of.h>
 #include <drm/drm_print.h>
diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c
index 695f307f36b2..208069faf183 100644
--- a/drivers/gpu/drm/imx/imx-ldb.c
+++ b/drivers/gpu/drm/imx/imx-ldb.c
@@ -20,6 +20,7 @@
 
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_of.h>
 #include <drm/drm_panel.h>
diff --git a/drivers/gpu/drm/imx/parallel-display.c b/drivers/gpu/drm/imx/parallel-display.c
index e7ce17503ae1..35518e5de356 100644
--- a/drivers/gpu/drm/imx/parallel-display.c
+++ b/drivers/gpu/drm/imx/parallel-display.c
@@ -13,6 +13,7 @@
 #include <video/of_display_timing.h>
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_of.h>
 #include <drm/drm_panel.h>
diff --git a/drivers/gpu/drm/ingenic/ingenic-drm.c b/drivers/gpu/drm/ingenic/ingenic-drm.c
index ce1fae3a78a9..1daa1378fc36 100644
--- a/drivers/gpu/drm/ingenic/ingenic-drm.c
+++ b/drivers/gpu/drm/ingenic/ingenic-drm.c
@@ -13,6 +13,7 @@
 
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_drv.h>
diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index be6d95c5ff25..01fa8b8d763d 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -17,6 +17,7 @@
 #include <video/videomode.h>
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_of.h>
 
diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 224afb666881..a413f5ff442d 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -16,6 +16,7 @@
 #include <video/videomode.h>
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_mipi_dsi.h>
 #include <drm/drm_of.h>
 #include <drm/drm_panel.h>
diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index ce91b61364eb..c79b1f855d89 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -23,6 +23,7 @@
 #include <sound/hdmi-codec.h>
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_print.h>
diff --git a/drivers/gpu/drm/msm/dsi/dsi.h b/drivers/gpu/drm/msm/dsi/dsi.h
index 0da8a4e428ad..eff1a4c61258 100644
--- a/drivers/gpu/drm/msm/dsi/dsi.h
+++ b/drivers/gpu/drm/msm/dsi/dsi.h
@@ -9,6 +9,7 @@
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 
+#include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_mipi_dsi.h>
 #include <drm/drm_panel.h>
diff --git a/drivers/gpu/drm/msm/edp/edp.h b/drivers/gpu/drm/msm/edp/edp.h
index f2c17858a703..eb34243dad53 100644
--- a/drivers/gpu/drm/msm/edp/edp.h
+++ b/drivers/gpu/drm/msm/edp/edp.h
@@ -10,6 +10,7 @@
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/platform_device.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_dp_helper.h>
 
diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.h b/drivers/gpu/drm/msm/hdmi/hdmi.h
index 982865866a29..4aba397a889b 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi.h
+++ b/drivers/gpu/drm/msm/hdmi/hdmi.h
@@ -13,6 +13,8 @@
 #include <linux/regulator/consumer.h>
 #include <linux/hdmi.h>
 
+#include <drm/drm_bridge.h>
+
 #include "msm_drv.h"
 #include "hdmi.xml.h"
 
diff --git a/drivers/gpu/drm/omapdrm/dss/output.c b/drivers/gpu/drm/omapdrm/dss/output.c
index de0f882f0f7b..de500bb05bdc 100644
--- a/drivers/gpu/drm/omapdrm/dss/output.c
+++ b/drivers/gpu/drm/omapdrm/dss/output.c
@@ -11,6 +11,7 @@
 #include <linux/of.h>
 #include <linux/of_graph.h>
 
+#include <drm/drm_bridge.h>
 #include <drm/drm_panel.h>
 
 #include "dss.h"
diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c
index 9f652d2e7af1..224ec6fdc800 100644
--- a/drivers/gpu/drm/omapdrm/omap_drv.c
+++ b/drivers/gpu/drm/omapdrm/omap_drv.c
@@ -11,6 +11,7 @@
 
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_file.h>
diff --git a/drivers/gpu/drm/omapdrm/omap_encoder.c b/drivers/gpu/drm/omapdrm/omap_encoder.c
index 6fe14111cd95..24bbe9f2a32e 100644
--- a/drivers/gpu/drm/omapdrm/omap_encoder.c
+++ b/drivers/gpu/drm/omapdrm/omap_encoder.c
@@ -6,6 +6,7 @@
 
 #include <linux/list.h>
 
+#include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_modeset_helper_vtables.h>
 #include <drm/drm_edid.h>
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
index 0f00bdfe2366..3a1139b725c0 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
@@ -9,6 +9,7 @@
 
 #include <linux/export.h>
 
+#include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_modeset_helper_vtables.h>
 #include <drm/drm_panel.h>
diff --git a/drivers/gpu/drm/rockchip/rockchip_lvds.c b/drivers/gpu/drm/rockchip/rockchip_lvds.c
index 64aefa856896..8a4c9af0ba73 100644
--- a/drivers/gpu/drm/rockchip/rockchip_lvds.c
+++ b/drivers/gpu/drm/rockchip/rockchip_lvds.c
@@ -16,6 +16,7 @@
 #include <linux/regmap.h>
 #include <linux/reset.h>
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 
 #include <drm/drm_dp_helper.h>
 #include <drm/drm_of.h>
diff --git a/drivers/gpu/drm/rockchip/rockchip_rgb.c b/drivers/gpu/drm/rockchip/rockchip_rgb.c
index 89e0bb0fe0ab..db1be1f3925c 100644
--- a/drivers/gpu/drm/rockchip/rockchip_rgb.c
+++ b/drivers/gpu/drm/rockchip/rockchip_rgb.c
@@ -9,6 +9,7 @@
 #include <linux/of_graph.h>
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_dp_helper.h>
 #include <drm/drm_of.h>
 #include <drm/drm_panel.h>
diff --git a/drivers/gpu/drm/sti/sti_dvo.c b/drivers/gpu/drm/sti/sti_dvo.c
index e55870190bf5..0a4f00253f39 100644
--- a/drivers/gpu/drm/sti/sti_dvo.c
+++ b/drivers/gpu/drm/sti/sti_dvo.c
@@ -12,6 +12,7 @@
 #include <linux/platform_device.h>
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_device.h>
 #include <drm/drm_panel.h>
 #include <drm/drm_print.h>
diff --git a/drivers/gpu/drm/sti/sti_hda.c b/drivers/gpu/drm/sti/sti_hda.c
index 94e404f13234..9d3fd6370a29 100644
--- a/drivers/gpu/drm/sti/sti_hda.c
+++ b/drivers/gpu/drm/sti/sti_hda.c
@@ -12,6 +12,7 @@
 #include <linux/seq_file.h>
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_debugfs.h>
 #include <drm/drm_device.h>
 #include <drm/drm_file.h>
diff --git a/drivers/gpu/drm/sti/sti_hdmi.c b/drivers/gpu/drm/sti/sti_hdmi.c
index 9862c322f0c4..84318d0832a0 100644
--- a/drivers/gpu/drm/sti/sti_hdmi.c
+++ b/drivers/gpu/drm/sti/sti_hdmi.c
@@ -14,6 +14,7 @@
 #include <linux/reset.h>
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_debugfs.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_edid.h>
diff --git a/drivers/gpu/drm/sun4i/sun4i_lvds.c b/drivers/gpu/drm/sun4i/sun4i_lvds.c
index 7fbf425acb55..25ab2ef6d545 100644
--- a/drivers/gpu/drm/sun4i/sun4i_lvds.c
+++ b/drivers/gpu/drm/sun4i/sun4i_lvds.c
@@ -7,6 +7,7 @@
 #include <linux/clk.h>
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_of.h>
 #include <drm/drm_panel.h>
 #include <drm/drm_print.h>
diff --git a/drivers/gpu/drm/sun4i/sun4i_rgb.c b/drivers/gpu/drm/sun4i/sun4i_rgb.c
index aac56983f208..e74b9eddca01 100644
--- a/drivers/gpu/drm/sun4i/sun4i_rgb.c
+++ b/drivers/gpu/drm/sun4i/sun4i_rgb.c
@@ -9,6 +9,7 @@
 #include <linux/clk.h>
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_of.h>
 #include <drm/drm_panel.h>
 #include <drm/drm_print.h>
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
index 690aeb822704..eb187da56aba 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
@@ -16,6 +16,7 @@
 #include <linux/reset.h>
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_connector.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_encoder.h>
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_external.c b/drivers/gpu/drm/tilcdc/tilcdc_external.c
index 43d756b7810e..4fc10838de80 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_external.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_external.c
@@ -8,6 +8,7 @@
 #include <linux/of_graph.h>
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_of.h>
 
 #include "tilcdc_drv.h"
diff --git a/drivers/gpu/drm/vc4/vc4_dsi.c b/drivers/gpu/drm/vc4/vc4_dsi.c
index c78fa8144776..3f63943e5472 100644
--- a/drivers/gpu/drm/vc4/vc4_dsi.c
+++ b/drivers/gpu/drm/vc4/vc4_dsi.c
@@ -31,6 +31,7 @@
 #include <linux/pm_runtime.h>
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_mipi_dsi.h>
 #include <drm/drm_of.h>
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 7d14c11bdc0a..7e2963cad543 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -41,7 +41,6 @@
 #include <drm/drm_connector.h>
 #include <drm/drm_device.h>
 #include <drm/drm_property.h>
-#include <drm/drm_bridge.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_plane.h>
 #include <drm/drm_blend.h>

From patchwork Mon Aug 26 15:26:30 2019
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From: Boris Brezillon <boris.brezillon@collabora.com>
To: dri-devel@lists.freedesktop.org
Subject: [PATCH v2 02/21] drm: Add a dummy bridge object to drm_encoder
Date: Mon, 26 Aug 2019 17:26:30 +0200
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Cc: Nikita Yushchenko <nikita.yoush@cogentembedded.com>,
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This in one step in the right direction towards drm_encoder/drm_bridge
unification. By doing that we also allow encoder drivers to implement
the ->pre_enable() and ->post_disable() hooks without adding new
methods to drm_encoder_helper_funcs.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
Changes in v2:
* New patch
---
 drivers/gpu/drm/drm_atomic_helper.c     | 17 +++++++++--------
 drivers/gpu/drm/drm_bridge.c            |  4 ++--
 drivers/gpu/drm/drm_crtc_helper.c       | 20 ++++++++++----------
 drivers/gpu/drm/drm_encoder.c           | 23 ++++++++++++++---------
 drivers/gpu/drm/drm_probe_helper.c      |  2 +-
 drivers/gpu/drm/exynos/exynos_drm_dsi.c |  2 +-
 drivers/gpu/drm/msm/edp/edp.c           |  2 +-
 drivers/gpu/drm/msm/edp/edp_bridge.c    |  2 +-
 drivers/gpu/drm/msm/hdmi/hdmi.c         |  2 +-
 drivers/gpu/drm/rcar-du/rcar_du_crtc.c  |  4 ++--
 drivers/gpu/drm/vc4/vc4_dsi.c           |  2 +-
 include/drm/drm_encoder.h               | 16 ++++++++++++++--
 12 files changed, 57 insertions(+), 39 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 4706439fb490..3fe60076da05 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -445,8 +445,9 @@ mode_fixup(struct drm_atomic_state *state)
 		encoder = new_conn_state->best_encoder;
 		funcs = encoder->helper_private;
 
-		ret = drm_bridge_mode_fixup(encoder->bridge, &new_crtc_state->mode,
-				&new_crtc_state->adjusted_mode);
+		ret = drm_bridge_mode_fixup(&encoder->bridge,
+					    &new_crtc_state->mode,
+					    &new_crtc_state->adjusted_mode);
 		if (!ret) {
 			DRM_DEBUG_ATOMIC("Bridge fixup failed\n");
 			return -EINVAL;
@@ -511,7 +512,7 @@ static enum drm_mode_status mode_valid_path(struct drm_connector *connector,
 		return ret;
 	}
 
-	ret = drm_bridge_mode_valid(encoder->bridge, mode);
+	ret = drm_bridge_mode_valid(&encoder->bridge, mode);
 	if (ret != MODE_OK) {
 		DRM_DEBUG_ATOMIC("[BRIDGE] mode_valid() failed\n");
 		return ret;
@@ -1030,7 +1031,7 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
 		 * Each encoder has at most one connector (since we always steal
 		 * it away), so we won't call disable hooks twice.
 		 */
-		drm_atomic_bridge_disable(encoder->bridge, old_state);
+		drm_atomic_bridge_disable(&encoder->bridge, old_state);
 
 		/* Right function depends upon target state. */
 		if (funcs) {
@@ -1044,7 +1045,7 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
 				funcs->dpms(encoder, DRM_MODE_DPMS_OFF);
 		}
 
-		drm_atomic_bridge_post_disable(encoder->bridge, old_state);
+		drm_atomic_bridge_post_disable(&encoder->bridge, old_state);
 	}
 
 	for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
@@ -1225,7 +1226,7 @@ crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *old_state)
 			funcs->mode_set(encoder, mode, adjusted_mode);
 		}
 
-		drm_bridge_mode_set(encoder->bridge, mode, adjusted_mode);
+		drm_bridge_mode_set(&encoder->bridge, mode, adjusted_mode);
 	}
 }
 
@@ -1342,7 +1343,7 @@ void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
 		 * Each encoder has at most one connector (since we always steal
 		 * it away), so we won't call enable hooks twice.
 		 */
-		drm_atomic_bridge_pre_enable(encoder->bridge, old_state);
+		drm_atomic_bridge_pre_enable(&encoder->bridge, old_state);
 
 		if (funcs) {
 			if (funcs->atomic_enable)
@@ -1353,7 +1354,7 @@ void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
 				funcs->commit(encoder);
 		}
 
-		drm_atomic_bridge_enable(encoder->bridge, old_state);
+		drm_atomic_bridge_enable(&encoder->bridge, old_state);
 	}
 
 	drm_atomic_helper_commit_writebacks(dev, old_state);
diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index cba537c99e43..c5d6b17f6790 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -139,8 +139,8 @@ int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
 
 	if (previous)
 		previous->next = bridge;
-	else
-		encoder->bridge = bridge;
+	else if (bridge != &encoder->bridge)
+		encoder->bridge.next = bridge;
 
 	return 0;
 }
diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index fa3694836c22..c80e33a84605 100644
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -160,14 +160,14 @@ drm_encoder_disable(struct drm_encoder *encoder)
 	if (!encoder_funcs)
 		return;
 
-	drm_bridge_disable(encoder->bridge);
+	drm_bridge_disable(&encoder->bridge);
 
 	if (encoder_funcs->disable)
 		(*encoder_funcs->disable)(encoder);
 	else if (encoder_funcs->dpms)
 		(*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 
-	drm_bridge_post_disable(encoder->bridge);
+	drm_bridge_post_disable(&encoder->bridge);
 }
 
 static void __drm_helper_disable_unused_functions(struct drm_device *dev)
@@ -327,8 +327,8 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 		if (!encoder_funcs)
 			continue;
 
-		ret = drm_bridge_mode_fixup(encoder->bridge,
-			mode, adjusted_mode);
+		ret = drm_bridge_mode_fixup(&encoder->bridge, mode,
+					    adjusted_mode);
 		if (!ret) {
 			DRM_DEBUG_KMS("Bridge fixup failed\n");
 			goto done;
@@ -365,13 +365,13 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 		if (!encoder_funcs)
 			continue;
 
-		drm_bridge_disable(encoder->bridge);
+		drm_bridge_disable(&encoder->bridge);
 
 		/* Disable the encoders as the first thing we do. */
 		if (encoder_funcs->prepare)
 			encoder_funcs->prepare(encoder);
 
-		drm_bridge_post_disable(encoder->bridge);
+		drm_bridge_post_disable(&encoder->bridge);
 	}
 
 	drm_crtc_prepare_encoders(dev);
@@ -399,7 +399,7 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 		if (encoder_funcs->mode_set)
 			encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 
-		drm_bridge_mode_set(encoder->bridge, mode, adjusted_mode);
+		drm_bridge_mode_set(&encoder->bridge, mode, adjusted_mode);
 	}
 
 	/* Now enable the clocks, plane, pipe, and connectors that we set up. */
@@ -414,12 +414,12 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 		if (!encoder_funcs)
 			continue;
 
-		drm_bridge_pre_enable(encoder->bridge);
+		drm_bridge_pre_enable(&encoder->bridge);
 
 		if (encoder_funcs->commit)
 			encoder_funcs->commit(encoder);
 
-		drm_bridge_enable(encoder->bridge);
+		drm_bridge_enable(&encoder->bridge);
 	}
 
 	/* Calculate and store various constants which
@@ -818,7 +818,7 @@ static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 /* Helper which handles bridge ordering around encoder dpms */
 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
 {
-	struct drm_bridge *bridge = encoder->bridge;
+	struct drm_bridge *bridge = &encoder->bridge;
 	const struct drm_encoder_helper_funcs *encoder_funcs;
 
 	encoder_funcs = encoder->helper_private;
diff --git a/drivers/gpu/drm/drm_encoder.c b/drivers/gpu/drm/drm_encoder.c
index 80d88a55302e..686053bf41b9 100644
--- a/drivers/gpu/drm/drm_encoder.c
+++ b/drivers/gpu/drm/drm_encoder.c
@@ -91,6 +91,9 @@ void drm_encoder_unregister_all(struct drm_device *dev)
 	}
 }
 
+static const struct drm_bridge_funcs dummy_bridge_funcs = {
+};
+
 /**
  * drm_encoder_init - Init a preallocated encoder
  * @dev: drm device
@@ -140,6 +143,13 @@ int drm_encoder_init(struct drm_device *dev,
 		goto out_put;
 	}
 
+	if (!encoder->bridge.funcs)
+		encoder->bridge.funcs = &dummy_bridge_funcs;
+
+	ret = drm_bridge_attach(encoder, &encoder->bridge, NULL);
+	if (ret)
+		goto out_put;
+
 	list_add_tail(&encoder->head, &dev->mode_config.encoder_list);
 	encoder->index = dev->mode_config.num_encoder++;
 
@@ -160,21 +170,16 @@ EXPORT_SYMBOL(drm_encoder_init);
 void drm_encoder_cleanup(struct drm_encoder *encoder)
 {
 	struct drm_device *dev = encoder->dev;
+	struct drm_bridge *bridge, *next;
 
 	/* Note that the encoder_list is considered to be static; should we
 	 * remove the drm_encoder at runtime we would have to decrement all
 	 * the indices on the drm_encoder after us in the encoder_list.
 	 */
 
-	if (encoder->bridge) {
-		struct drm_bridge *bridge = encoder->bridge;
-		struct drm_bridge *next;
-
-		while (bridge) {
-			next = bridge->next;
-			drm_bridge_detach(bridge);
-			bridge = next;
-		}
+	for (bridge = &encoder->bridge; bridge; bridge = next) {
+		next = bridge->next;
+		drm_bridge_detach(bridge);
 	}
 
 	drm_mode_object_unregister(dev, &encoder->base);
diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
index 351cbc40f0f8..e4af2f9fa372 100644
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -113,7 +113,7 @@ drm_mode_validate_pipeline(struct drm_display_mode *mode,
 			continue;
 		}
 
-		ret = drm_bridge_mode_valid(encoder->bridge, mode);
+		ret = drm_bridge_mode_valid(&encoder->bridge, mode);
 		if (ret != MODE_OK) {
 			/* There is also no point in continuing for crtc check
 			 * here. */
diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index 72726f2c7a9f..8e655ae1fb0c 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -1522,7 +1522,7 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
 	if (out_bridge) {
 		drm_bridge_attach(encoder, out_bridge, NULL);
 		dsi->out_bridge = out_bridge;
-		encoder->bridge = NULL;
+		encoder->bridge.next = NULL;
 	} else {
 		int ret = exynos_dsi_create_connector(encoder);
 
diff --git a/drivers/gpu/drm/msm/edp/edp.c b/drivers/gpu/drm/msm/edp/edp.c
index 0f312ac5b624..b54559a79d36 100644
--- a/drivers/gpu/drm/msm/edp/edp.c
+++ b/drivers/gpu/drm/msm/edp/edp.c
@@ -178,7 +178,7 @@ int msm_edp_modeset_init(struct msm_edp *edp, struct drm_device *dev,
 		goto fail;
 	}
 
-	encoder->bridge = edp->bridge;
+	encoder->bridge.next = edp->bridge;
 
 	priv->bridges[priv->num_bridges++]       = edp->bridge;
 	priv->connectors[priv->num_connectors++] = edp->connector;
diff --git a/drivers/gpu/drm/msm/edp/edp_bridge.c b/drivers/gpu/drm/msm/edp/edp_bridge.c
index 2950bba4aca9..446acca110e9 100644
--- a/drivers/gpu/drm/msm/edp/edp_bridge.c
+++ b/drivers/gpu/drm/msm/edp/edp_bridge.c
@@ -56,7 +56,7 @@ static void edp_bridge_mode_set(struct drm_bridge *bridge,
 
 	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 		if ((connector->encoder != NULL) &&
-			(connector->encoder->bridge == bridge)) {
+			(connector->encoder->bridge.next == bridge)) {
 			msm_edp_ctrl_timing_cfg(edp->ctrl,
 				adjusted_mode, &connector->display_info);
 			break;
diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.c b/drivers/gpu/drm/msm/hdmi/hdmi.c
index 0e4217be3f00..9d94a88dd8d6 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi.c
@@ -327,7 +327,7 @@ int msm_hdmi_modeset_init(struct hdmi *hdmi,
 		goto fail;
 	}
 
-	encoder->bridge = hdmi->bridge;
+	encoder->bridge.next = hdmi->bridge;
 
 	priv->bridges[priv->num_bridges++]       = hdmi->bridge;
 	priv->connectors[priv->num_connectors++] = hdmi->connector;
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
index 2da46e3dc4ae..1bd748202946 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
@@ -681,7 +681,7 @@ static void rcar_du_crtc_atomic_enable(struct drm_crtc *crtc,
 		const struct drm_display_mode *mode =
 			&crtc->state->adjusted_mode;
 
-		rcar_lvds_clk_enable(encoder->base.bridge,
+		rcar_lvds_clk_enable(encoder->base.bridge.next,
 				     mode->clock * 1000);
 	}
 
@@ -707,7 +707,7 @@ static void rcar_du_crtc_atomic_disable(struct drm_crtc *crtc,
 		 * Disable the LVDS clock output, see
 		 * rcar_du_crtc_atomic_enable().
 		 */
-		rcar_lvds_clk_disable(encoder->base.bridge);
+		rcar_lvds_clk_disable(encoder->base.bridge.next);
 	}
 
 	spin_lock_irq(&crtc->dev->event_lock);
diff --git a/drivers/gpu/drm/vc4/vc4_dsi.c b/drivers/gpu/drm/vc4/vc4_dsi.c
index 3f63943e5472..e64b66b1efcd 100644
--- a/drivers/gpu/drm/vc4/vc4_dsi.c
+++ b/drivers/gpu/drm/vc4/vc4_dsi.c
@@ -1610,7 +1610,7 @@ static int vc4_dsi_bind(struct device *dev, struct device *master, void *data)
 	 * from our driver, since we need to sequence them within the
 	 * encoder's enable/disable paths.
 	 */
-	dsi->encoder->bridge = NULL;
+	dsi->encoder->bridge.next = NULL;
 
 	if (dsi->port == 0)
 		vc4_debugfs_add_regset32(drm, "dsi0_regs", &dsi->regset);
diff --git a/include/drm/drm_encoder.h b/include/drm/drm_encoder.h
index 70cfca03d812..30d347c37402 100644
--- a/include/drm/drm_encoder.h
+++ b/include/drm/drm_encoder.h
@@ -25,6 +25,7 @@
 
 #include <linux/list.h>
 #include <linux/ctype.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_mode.h>
 #include <drm/drm_mode_object.h>
@@ -89,7 +90,6 @@ struct drm_encoder_funcs {
  * @head: list management
  * @base: base KMS object
  * @name: human readable name, can be overwritten by the driver
- * @bridge: bridge associated to the encoder
  * @funcs: control functions
  * @helper_private: mid-layer private data
  *
@@ -172,13 +172,25 @@ struct drm_encoder {
 	 * &drm_connector_state.crtc.
 	 */
 	struct drm_crtc *crtc;
-	struct drm_bridge *bridge;
+
+	/**
+	 * @bridge: Bridge representing our encoder. Other bridges might be
+	 * linked to this dummy bridge element to form an encoder chain.
+	 */
+	struct drm_bridge bridge;
+
 	const struct drm_encoder_funcs *funcs;
 	const struct drm_encoder_helper_funcs *helper_private;
 };
 
 #define obj_to_encoder(x) container_of(x, struct drm_encoder, base)
 
+static inline struct drm_encoder *
+bridge_to_encoder(struct drm_bridge *bridge)
+{
+	return container_of(bridge, struct drm_encoder, bridge);
+}
+
 __printf(5, 6)
 int drm_encoder_init(struct drm_device *dev,
 		     struct drm_encoder *encoder,

From patchwork Mon Aug 26 15:26:31 2019
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From: Boris Brezillon <boris.brezillon@collabora.com>
To: dri-devel@lists.freedesktop.org
Subject: [PATCH v2 03/21] drm/vc4: Implement bridge_funcs instead of
 encoder_helper_funcs
Date: Mon, 26 Aug 2019 17:26:31 +0200
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Cc: Nikita Yushchenko <nikita.yoush@cogentembedded.com>,
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Those hooks are called exactly at the same time except the bridge
funcs have pre_enable()/post_disable() hooks which allows us to get
rid of the hack resetting encoder->bridge.next (was needed to control
the encoder/bridge enable/disable sequence).

We can also get of the dsi->bridge field since the bridge pointer is
available in encoder->bridge.next.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
Changes in v2:
* New patch (replaces "drm/vc4: Get rid of the dsi->bridge field")
---
 drivers/gpu/drm/vc4/vc4_dsi.c | 70 +++++++++++++++++++----------------
 1 file changed, 39 insertions(+), 31 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_dsi.c b/drivers/gpu/drm/vc4/vc4_dsi.c
index e64b66b1efcd..4aa4c1a94f17 100644
--- a/drivers/gpu/drm/vc4/vc4_dsi.c
+++ b/drivers/gpu/drm/vc4/vc4_dsi.c
@@ -498,7 +498,6 @@ struct vc4_dsi {
 
 	struct mipi_dsi_host dsi_host;
 	struct drm_encoder *encoder;
-	struct drm_bridge *bridge;
 
 	void __iomem *regs;
 
@@ -747,16 +746,13 @@ dsi_esc_timing(u32 ns)
 	return DIV_ROUND_UP(ns, ESC_TIME_NS);
 }
 
-static void vc4_dsi_encoder_disable(struct drm_encoder *encoder)
+static void vc4_dsi_bridge_post_disable(struct drm_bridge *bridge)
 {
+	struct drm_encoder *encoder = bridge_to_encoder(bridge);
 	struct vc4_dsi_encoder *vc4_encoder = to_vc4_dsi_encoder(encoder);
 	struct vc4_dsi *dsi = vc4_encoder->dsi;
 	struct device *dev = &dsi->pdev->dev;
 
-	drm_bridge_disable(dsi->bridge);
-	vc4_dsi_ulps(dsi, true);
-	drm_bridge_post_disable(dsi->bridge);
-
 	clk_disable_unprepare(dsi->pll_phy_clock);
 	clk_disable_unprepare(dsi->escape_clock);
 	clk_disable_unprepare(dsi->pixel_clock);
@@ -764,6 +760,15 @@ static void vc4_dsi_encoder_disable(struct drm_encoder *encoder)
 	pm_runtime_put(dev);
 }
 
+static void vc4_dsi_bridge_disable(struct drm_bridge *bridge)
+{
+	struct drm_encoder *encoder = bridge_to_encoder(bridge);
+	struct vc4_dsi_encoder *vc4_encoder = to_vc4_dsi_encoder(encoder);
+	struct vc4_dsi *dsi = vc4_encoder->dsi;
+
+	vc4_dsi_ulps(dsi, true);
+}
+
 /* Extends the mode's blank intervals to handle BCM2835's integer-only
  * DSI PLL divider.
  *
@@ -777,10 +782,11 @@ static void vc4_dsi_encoder_disable(struct drm_encoder *encoder)
  * higher-than-expected clock rate to the panel, but that's what the
  * firmware does too.
  */
-static bool vc4_dsi_encoder_mode_fixup(struct drm_encoder *encoder,
-				       const struct drm_display_mode *mode,
-				       struct drm_display_mode *adjusted_mode)
+static bool vc4_dsi_bridge_mode_fixup(struct drm_bridge *bridge,
+				      const struct drm_display_mode *mode,
+				      struct drm_display_mode *adjusted_mode)
 {
+	struct drm_encoder *encoder = bridge_to_encoder(bridge);
 	struct vc4_dsi_encoder *vc4_encoder = to_vc4_dsi_encoder(encoder);
 	struct vc4_dsi *dsi = vc4_encoder->dsi;
 	struct clk *phy_parent = clk_get_parent(dsi->pll_phy_clock);
@@ -816,8 +822,9 @@ static bool vc4_dsi_encoder_mode_fixup(struct drm_encoder *encoder,
 	return true;
 }
 
-static void vc4_dsi_encoder_enable(struct drm_encoder *encoder)
+static void vc4_dsi_bridge_pre_enable(struct drm_bridge *bridge)
 {
+	struct drm_encoder *encoder = bridge_to_encoder(bridge);
 	struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
 	struct vc4_dsi_encoder *vc4_encoder = to_vc4_dsi_encoder(encoder);
 	struct vc4_dsi *dsi = vc4_encoder->dsi;
@@ -1054,8 +1061,14 @@ static void vc4_dsi_encoder_enable(struct drm_encoder *encoder)
 	}
 
 	vc4_dsi_ulps(dsi, false);
+}
 
-	drm_bridge_pre_enable(dsi->bridge);
+static void vc4_dsi_bridge_enable(struct drm_bridge *bridge)
+{
+	struct drm_encoder *encoder = bridge_to_encoder(bridge);
+	struct vc4_dsi_encoder *vc4_encoder = to_vc4_dsi_encoder(encoder);
+	struct vc4_dsi *dsi = vc4_encoder->dsi;
+	bool debug_dump_regs = false;
 
 	if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO) {
 		DSI_PORT_WRITE(DISP0_CTRL,
@@ -1072,8 +1085,6 @@ static void vc4_dsi_encoder_enable(struct drm_encoder *encoder)
 			       DSI_DISP0_ENABLE);
 	}
 
-	drm_bridge_enable(dsi->bridge);
-
 	if (debug_dump_regs) {
 		struct drm_printer p = drm_info_printer(&dsi->pdev->dev);
 		dev_info(&dsi->pdev->dev, "DSI regs after:\n");
@@ -1290,10 +1301,12 @@ static const struct mipi_dsi_host_ops vc4_dsi_host_ops = {
 	.transfer = vc4_dsi_host_transfer,
 };
 
-static const struct drm_encoder_helper_funcs vc4_dsi_encoder_helper_funcs = {
-	.disable = vc4_dsi_encoder_disable,
-	.enable = vc4_dsi_encoder_enable,
-	.mode_fixup = vc4_dsi_encoder_mode_fixup,
+static const struct drm_bridge_funcs vc4_dsi_bridge_funcs = {
+	.pre_enable = vc4_dsi_bridge_pre_enable,
+	.enable = vc4_dsi_bridge_enable,
+	.disable = vc4_dsi_bridge_disable,
+	.post_disable = vc4_dsi_bridge_post_disable,
+	.mode_fixup = vc4_dsi_bridge_mode_fixup,
 };
 
 static const struct of_device_id vc4_dsi_dt_match[] = {
@@ -1445,6 +1458,7 @@ static int vc4_dsi_bind(struct device *dev, struct device *master, void *data)
 	struct vc4_dev *vc4 = to_vc4_dev(drm);
 	struct vc4_dsi *dsi = dev_get_drvdata(dev);
 	struct vc4_dsi_encoder *vc4_dsi_encoder;
+	struct drm_bridge *bridge;
 	struct drm_panel *panel;
 	const struct of_device_id *match;
 	dma_cap_mask_t dma_mask;
@@ -1561,7 +1575,7 @@ static int vc4_dsi_bind(struct device *dev, struct device *master, void *data)
 	}
 
 	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
-					  &panel, &dsi->bridge);
+					  &panel, &bridge);
 	if (ret) {
 		/* If the bridge or panel pointed by dev->of_node is not
 		 * enabled, just return 0 here so that we don't prevent the DRM
@@ -1576,10 +1590,10 @@ static int vc4_dsi_bind(struct device *dev, struct device *master, void *data)
 	}
 
 	if (panel) {
-		dsi->bridge = devm_drm_panel_bridge_add(dev, panel,
-							DRM_MODE_CONNECTOR_DSI);
-		if (IS_ERR(dsi->bridge))
-			return PTR_ERR(dsi->bridge);
+		bridge = devm_drm_panel_bridge_add(dev, panel,
+						   DRM_MODE_CONNECTOR_DSI);
+		if (IS_ERR(bridge))
+			return PTR_ERR(bridge);
 	}
 
 	/* The esc clock rate is supposed to always be 100Mhz. */
@@ -1596,21 +1610,15 @@ static int vc4_dsi_bind(struct device *dev, struct device *master, void *data)
 	if (dsi->port == 1)
 		vc4->dsi1 = dsi;
 
+	dsi->encoder->bridge.funcs = &vc4_dsi_bridge_funcs;
 	drm_encoder_init(drm, dsi->encoder, &vc4_dsi_encoder_funcs,
 			 DRM_MODE_ENCODER_DSI, NULL);
-	drm_encoder_helper_add(dsi->encoder, &vc4_dsi_encoder_helper_funcs);
 
-	ret = drm_bridge_attach(dsi->encoder, dsi->bridge, NULL);
+	ret = drm_bridge_attach(dsi->encoder, bridge, NULL);
 	if (ret) {
 		dev_err(dev, "bridge attach failed: %d\n", ret);
 		return ret;
 	}
-	/* Disable the atomic helper calls into the bridge.  We
-	 * manually call the bridge pre_enable / enable / etc. calls
-	 * from our driver, since we need to sequence them within the
-	 * encoder's enable/disable paths.
-	 */
-	dsi->encoder->bridge.next = NULL;
 
 	if (dsi->port == 0)
 		vc4_debugfs_add_regset32(drm, "dsi0_regs", &dsi->regset);
@@ -1629,7 +1637,7 @@ static void vc4_dsi_unbind(struct device *dev, struct device *master,
 	struct vc4_dev *vc4 = to_vc4_dev(drm);
 	struct vc4_dsi *dsi = dev_get_drvdata(dev);
 
-	if (dsi->bridge)
+	if (dsi->encoder->bridge.next)
 		pm_runtime_disable(dev);
 
 	vc4_dsi_encoder_destroy(dsi->encoder);

From patchwork Mon Aug 26 15:26:32 2019
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From: Boris Brezillon <boris.brezillon@collabora.com>
To: dri-devel@lists.freedesktop.org
Subject: [PATCH v2 04/21] drm/exynos: Fix potential unbalanced calls to
 pm_runtime_put
Date: Mon, 26 Aug 2019 17:26:32 +0200
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The encoder->enable() can't report errors and is expected to always
succeed. If we call pm_runtime_put() in the exynos_dsi_enable() error
path (as currently done) we'll have unbalanced get/put calls when
encoder->disable() is called.

The situation is not ideal since drm_panel_{prepare,enable}() can
theoretically return an error (even if in practice I don't think any
panel driver does that). Putting a WARN_ON() is the best we can do,
unfortunately. Note that -ENOSYS is actually a valid case, it just
means the panel driver does not implement the hook.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
Changes in v2:
* New patch
---
 drivers/gpu/drm/exynos/exynos_drm_dsi.c | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index 8e655ae1fb0c..c555cecfe1f5 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -1387,8 +1387,7 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
 
 	if (dsi->panel) {
 		ret = drm_panel_prepare(dsi->panel);
-		if (ret < 0)
-			goto err_put_sync;
+		WARN_ON(ret && ret != -ENOSYS);
 	} else {
 		drm_bridge_pre_enable(dsi->out_bridge);
 	}
@@ -1398,22 +1397,13 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
 
 	if (dsi->panel) {
 		ret = drm_panel_enable(dsi->panel);
-		if (ret < 0)
-			goto err_display_disable;
+		WARN_ON(ret && ret != -ENOSYS);
 	} else {
 		drm_bridge_enable(dsi->out_bridge);
 	}
 
 	dsi->state |= DSIM_STATE_VIDOUT_AVAILABLE;
 	return;
-
-err_display_disable:
-	exynos_dsi_set_display_enable(dsi, false);
-	drm_panel_unprepare(dsi->panel);
-
-err_put_sync:
-	dsi->state &= ~DSIM_STATE_ENABLED;
-	pm_runtime_put(dsi->dev);
 }
 
 static void exynos_dsi_disable(struct drm_encoder *encoder)

From patchwork Mon Aug 26 15:26:33 2019
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To: dri-devel@lists.freedesktop.org
Subject: [PATCH v2 05/21] drm/exynos: Don't reset bridge->next
Date: Mon, 26 Aug 2019 17:26:33 +0200
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bridge->next is only points to the new bridge if drm_bridge_attach()
succeeds. No need to reset it manually here.

Note that this change is part of the attempt to make the bridge chain
a double-linked list. In order to do that we must patch all drivers
manipulating the bridge->next field.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
Changes in v2:
* Add Laurent's R-b (I'd like to have a R-b from the DRM exynos
  maintainers before applying that one)
---
 drivers/gpu/drm/exynos/exynos_dp.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/gpu/drm/exynos/exynos_dp.c b/drivers/gpu/drm/exynos/exynos_dp.c
index 1e6aa24bf45e..4785885c0f4f 100644
--- a/drivers/gpu/drm/exynos/exynos_dp.c
+++ b/drivers/gpu/drm/exynos/exynos_dp.c
@@ -110,7 +110,6 @@ static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
 		if (ret) {
 			DRM_DEV_ERROR(dp->dev,
 				      "Failed to attach bridge to drm\n");
-			bridge->next = NULL;
 			return ret;
 		}
 	}

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Subject: [PATCH v2 06/21] drm/exynos: Implement bridge_funcs instead of
 encoder_helper_funcs
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Those hooks are called exactly at the same time except the bridge
funcs have pre_enable()/post_disable() hooks which allows us to get
rid of the hack resetting encoder->bridge.next (was needed to control
the encoder/bridge enable/disable sequence).

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
Changes in v2:
* New patch (replacement for "drm/exynos: Get rid of exynos_dsi->out_bridge")
---
 drivers/gpu/drm/exynos/exynos_drm_dsi.c | 55 ++++++++++++++++---------
 1 file changed, 36 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index c555cecfe1f5..4f713b0ac244 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -1374,40 +1374,48 @@ static void exynos_dsi_unregister_te_irq(struct exynos_dsi *dsi)
 	}
 }
 
-static void exynos_dsi_enable(struct drm_encoder *encoder)
+static void exynos_dsi_pre_enable(struct drm_bridge *bridge)
 {
+	struct drm_encoder *encoder = bridge_to_encoder(bridge);
 	struct exynos_dsi *dsi = encoder_to_dsi(encoder);
-	int ret;
 
 	if (dsi->state & DSIM_STATE_ENABLED)
 		return;
 
 	pm_runtime_get_sync(dsi->dev);
-	dsi->state |= DSIM_STATE_ENABLED;
 
 	if (dsi->panel) {
+		int ret;
+
 		ret = drm_panel_prepare(dsi->panel);
 		WARN_ON(ret && ret != -ENOSYS);
-	} else {
-		drm_bridge_pre_enable(dsi->out_bridge);
 	}
+}
+
+static void exynos_dsi_enable(struct drm_bridge *bridge)
+{
+	struct drm_encoder *encoder = bridge_to_encoder(bridge);
+	struct exynos_dsi *dsi = encoder_to_dsi(encoder);
+
+	if (dsi->state & DSIM_STATE_ENABLED)
+		return;
 
 	exynos_dsi_set_display_mode(dsi);
 	exynos_dsi_set_display_enable(dsi, true);
 
 	if (dsi->panel) {
+		int ret;
+
 		ret = drm_panel_enable(dsi->panel);
 		WARN_ON(ret && ret != -ENOSYS);
-	} else {
-		drm_bridge_enable(dsi->out_bridge);
 	}
 
-	dsi->state |= DSIM_STATE_VIDOUT_AVAILABLE;
-	return;
+	dsi->state |= DSIM_STATE_VIDOUT_AVAILABLE | DSIM_STATE_ENABLED;
 }
 
-static void exynos_dsi_disable(struct drm_encoder *encoder)
+static void exynos_dsi_disable(struct drm_bridge *bridge)
 {
+	struct drm_encoder *encoder = bridge_to_encoder(bridge);
 	struct exynos_dsi *dsi = encoder_to_dsi(encoder);
 
 	if (!(dsi->state & DSIM_STATE_ENABLED))
@@ -1415,11 +1423,18 @@ static void exynos_dsi_disable(struct drm_encoder *encoder)
 
 	dsi->state &= ~DSIM_STATE_VIDOUT_AVAILABLE;
 
-	drm_panel_disable(dsi->panel);
-	drm_bridge_disable(dsi->out_bridge);
 	exynos_dsi_set_display_enable(dsi, false);
 	drm_panel_unprepare(dsi->panel);
-	drm_bridge_post_disable(dsi->out_bridge);
+}
+
+static void exynos_dsi_post_disable(struct drm_bridge *bridge)
+{
+	struct drm_encoder *encoder = bridge_to_encoder(bridge);
+	struct exynos_dsi *dsi = encoder_to_dsi(encoder);
+
+	if (!(dsi->state & DSIM_STATE_ENABLED))
+		return;
+
 	dsi->state &= ~DSIM_STATE_ENABLED;
 	pm_runtime_put_sync(dsi->dev);
 }
@@ -1489,9 +1504,11 @@ static int exynos_dsi_create_connector(struct drm_encoder *encoder)
 	return 0;
 }
 
-static const struct drm_encoder_helper_funcs exynos_dsi_encoder_helper_funcs = {
+static const struct drm_bridge_funcs exynos_dsi_bridge_funcs = {
+	.pre_enable = exynos_dsi_pre_enable,
 	.enable = exynos_dsi_enable,
 	.disable = exynos_dsi_disable,
+	.post_disable = exynos_dsi_post_disable,
 };
 
 static const struct drm_encoder_funcs exynos_dsi_encoder_funcs = {
@@ -1512,7 +1529,6 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
 	if (out_bridge) {
 		drm_bridge_attach(encoder, out_bridge, NULL);
 		dsi->out_bridge = out_bridge;
-		encoder->bridge.next = NULL;
 	} else {
 		int ret = exynos_dsi_create_connector(encoder);
 
@@ -1569,7 +1585,8 @@ static int exynos_dsi_host_detach(struct mipi_dsi_host *host,
 
 	if (dsi->panel) {
 		mutex_lock(&drm->mode_config.mutex);
-		exynos_dsi_disable(&dsi->encoder);
+		exynos_dsi_disable(&dsi->encoder.bridge);
+		exynos_dsi_post_disable(&dsi->encoder.bridge);
 		drm_panel_detach(dsi->panel);
 		dsi->panel = NULL;
 		dsi->connector.status = connector_status_disconnected;
@@ -1674,11 +1691,10 @@ static int exynos_dsi_bind(struct device *dev, struct device *master,
 	struct drm_bridge *in_bridge;
 	int ret;
 
+	encoder->bridge.funcs = &exynos_dsi_bridge_funcs;
 	drm_encoder_init(drm_dev, encoder, &exynos_dsi_encoder_funcs,
 			 DRM_MODE_ENCODER_TMDS, NULL);
 
-	drm_encoder_helper_add(encoder, &exynos_dsi_encoder_helper_funcs);
-
 	ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
 	if (ret < 0)
 		return ret;
@@ -1698,7 +1714,8 @@ static void exynos_dsi_unbind(struct device *dev, struct device *master,
 	struct drm_encoder *encoder = dev_get_drvdata(dev);
 	struct exynos_dsi *dsi = encoder_to_dsi(encoder);
 
-	exynos_dsi_disable(encoder);
+	exynos_dsi_disable(&encoder->bridge);
+	exynos_dsi_post_disable(&encoder->bridge);
 
 	mipi_dsi_host_unregister(&dsi->dsi_host);
 }

From patchwork Mon Aug 26 15:26:35 2019
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From: Boris Brezillon <boris.brezillon@collabora.com>
To: dri-devel@lists.freedesktop.org
Subject: [PATCH v2 07/21] drm/bridge: Rename bridge helpers targeting a bridge
 chain
Date: Mon, 26 Aug 2019 17:26:35 +0200
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Cc: Nikita Yushchenko <nikita.yoush@cogentembedded.com>,
 Jernej Skrabec <jernej.skrabec@siol.net>,
 Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
 Neil Armstrong <narmstrong@baylibre.com>,
 Andrey Smirnov <andrew.smirnov@gmail.com>, Jonas Karlman <jonas@kwiboo.se>,
 Seung-Woo Kim <sw0312.kim@samsung.com>,
 Kyungmin Park <kyungmin.park@samsung.com>,
 Thierry Reding <thierry.reding@gmail.com>,
 Chris Healy <Chris.Healy@zii.aero>,
 Boris Brezillon <boris.brezillon@collabora.com>, kernel@collabora.com,
 Sam Ravnborg <sam@ravnborg.org>
Errors-To: dri-devel-bounces@lists.freedesktop.org
Sender: "dri-devel" <dri-devel-bounces@lists.freedesktop.org>

Change the prefix of bridge helpers targeting a bridge chain from
drm_bridge_ to drm_bridge_chain_ to better reflect the fact that
the operation will happen on all elements of chain, starting at the
bridge passed in argument.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
Changes in v2:
* Pass te bridge, not the encoder, so we can later act on a sub-chain
  instead of the whole chain
---
 drivers/gpu/drm/drm_atomic_helper.c |  20 +++--
 drivers/gpu/drm/drm_bridge.c        | 125 ++++++++++++++--------------
 drivers/gpu/drm/drm_crtc_helper.c   |  28 +++----
 drivers/gpu/drm/drm_probe_helper.c  |   2 +-
 drivers/gpu/drm/mediatek/mtk_hdmi.c |   4 +-
 include/drm/drm_bridge.h            |  64 +++++++-------
 6 files changed, 126 insertions(+), 117 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 3fe60076da05..cccd9e3531c1 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -445,9 +445,9 @@ mode_fixup(struct drm_atomic_state *state)
 		encoder = new_conn_state->best_encoder;
 		funcs = encoder->helper_private;
 
-		ret = drm_bridge_mode_fixup(&encoder->bridge,
-					    &new_crtc_state->mode,
-					    &new_crtc_state->adjusted_mode);
+		ret = drm_bridge_chain_mode_fixup(&encoder->bridge,
+					&new_crtc_state->mode,
+					&new_crtc_state->adjusted_mode);
 		if (!ret) {
 			DRM_DEBUG_ATOMIC("Bridge fixup failed\n");
 			return -EINVAL;
@@ -512,7 +512,7 @@ static enum drm_mode_status mode_valid_path(struct drm_connector *connector,
 		return ret;
 	}
 
-	ret = drm_bridge_mode_valid(&encoder->bridge, mode);
+	ret = drm_bridge_chain_mode_valid(&encoder->bridge, mode);
 	if (ret != MODE_OK) {
 		DRM_DEBUG_ATOMIC("[BRIDGE] mode_valid() failed\n");
 		return ret;
@@ -1031,7 +1031,7 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
 		 * Each encoder has at most one connector (since we always steal
 		 * it away), so we won't call disable hooks twice.
 		 */
-		drm_atomic_bridge_disable(&encoder->bridge, old_state);
+		drm_atomic_bridge_chain_disable(&encoder->bridge, old_state);
 
 		/* Right function depends upon target state. */
 		if (funcs) {
@@ -1045,7 +1045,8 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
 				funcs->dpms(encoder, DRM_MODE_DPMS_OFF);
 		}
 
-		drm_atomic_bridge_post_disable(&encoder->bridge, old_state);
+		drm_atomic_bridge_chain_post_disable(&encoder->bridge,
+						     old_state);
 	}
 
 	for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
@@ -1226,7 +1227,8 @@ crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *old_state)
 			funcs->mode_set(encoder, mode, adjusted_mode);
 		}
 
-		drm_bridge_mode_set(&encoder->bridge, mode, adjusted_mode);
+		drm_bridge_chain_mode_set(&encoder->bridge, mode,
+					  adjusted_mode);
 	}
 }
 
@@ -1343,7 +1345,7 @@ void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
 		 * Each encoder has at most one connector (since we always steal
 		 * it away), so we won't call enable hooks twice.
 		 */
-		drm_atomic_bridge_pre_enable(&encoder->bridge, old_state);
+		drm_atomic_bridge_chain_pre_enable(&encoder->bridge, old_state);
 
 		if (funcs) {
 			if (funcs->atomic_enable)
@@ -1354,7 +1356,7 @@ void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
 				funcs->commit(encoder);
 		}
 
-		drm_atomic_bridge_enable(&encoder->bridge, old_state);
+		drm_atomic_bridge_chain_enable(&encoder->bridge, old_state);
 	}
 
 	drm_atomic_helper_commit_writebacks(dev, old_state);
diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index c5d6b17f6790..52f1263530b7 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -172,8 +172,8 @@ void drm_bridge_detach(struct drm_bridge *bridge)
  */
 
 /**
- * drm_bridge_mode_fixup - fixup proposed mode for all bridges in the
- *			   encoder chain
+ * drm_bridge_chain_mode_fixup - fixup proposed mode for all bridges in the
+ *				 encoder chain
  * @bridge: bridge control structure
  * @mode: desired mode to be set for the bridge
  * @adjusted_mode: updated mode that works for this bridge
@@ -186,9 +186,9 @@ void drm_bridge_detach(struct drm_bridge *bridge)
  * RETURNS:
  * true on success, false on failure
  */
-bool drm_bridge_mode_fixup(struct drm_bridge *bridge,
-			const struct drm_display_mode *mode,
-			struct drm_display_mode *adjusted_mode)
+bool drm_bridge_chain_mode_fixup(struct drm_bridge *bridge,
+				 const struct drm_display_mode *mode,
+				 struct drm_display_mode *adjusted_mode)
 {
 	bool ret = true;
 
@@ -198,15 +198,16 @@ bool drm_bridge_mode_fixup(struct drm_bridge *bridge,
 	if (bridge->funcs->mode_fixup)
 		ret = bridge->funcs->mode_fixup(bridge, mode, adjusted_mode);
 
-	ret = ret && drm_bridge_mode_fixup(bridge->next, mode, adjusted_mode);
+	ret = ret && drm_bridge_chain_mode_fixup(bridge->next, mode,
+						 adjusted_mode);
 
 	return ret;
 }
-EXPORT_SYMBOL(drm_bridge_mode_fixup);
+EXPORT_SYMBOL(drm_bridge_chain_mode_fixup);
 
 /**
- * drm_bridge_mode_valid - validate the mode against all bridges in the
- * 			   encoder chain.
+ * drm_bridge_chain_mode_valid - validate the mode against all bridges in the
+ *				 encoder chain.
  * @bridge: bridge control structure
  * @mode: desired mode to be validated
  *
@@ -219,8 +220,9 @@ EXPORT_SYMBOL(drm_bridge_mode_fixup);
  * RETURNS:
  * MODE_OK on success, drm_mode_status Enum error code on failure
  */
-enum drm_mode_status drm_bridge_mode_valid(struct drm_bridge *bridge,
-					   const struct drm_display_mode *mode)
+enum drm_mode_status
+drm_bridge_chain_mode_valid(struct drm_bridge *bridge,
+			    const struct drm_display_mode *mode)
 {
 	enum drm_mode_status ret = MODE_OK;
 
@@ -233,12 +235,12 @@ enum drm_mode_status drm_bridge_mode_valid(struct drm_bridge *bridge,
 	if (ret != MODE_OK)
 		return ret;
 
-	return drm_bridge_mode_valid(bridge->next, mode);
+	return drm_bridge_chain_mode_valid(bridge->next, mode);
 }
-EXPORT_SYMBOL(drm_bridge_mode_valid);
+EXPORT_SYMBOL(drm_bridge_chain_mode_valid);
 
 /**
- * drm_bridge_disable - disables all bridges in the encoder chain
+ * drm_bridge_chain_disable - disables all bridges in the encoder chain
  * @bridge: bridge control structure
  *
  * Calls &drm_bridge_funcs.disable op for all the bridges in the encoder
@@ -247,20 +249,21 @@ EXPORT_SYMBOL(drm_bridge_mode_valid);
  *
  * Note: the bridge passed should be the one closest to the encoder
  */
-void drm_bridge_disable(struct drm_bridge *bridge)
+void drm_bridge_chain_disable(struct drm_bridge *bridge)
 {
 	if (!bridge)
 		return;
 
-	drm_bridge_disable(bridge->next);
+	drm_bridge_chain_disable(bridge->next);
 
 	if (bridge->funcs->disable)
 		bridge->funcs->disable(bridge);
 }
-EXPORT_SYMBOL(drm_bridge_disable);
+EXPORT_SYMBOL(drm_bridge_chain_disable);
 
 /**
- * drm_bridge_post_disable - cleans up after disabling all bridges in the encoder chain
+ * drm_bridge_chain_post_disable - cleans up after disabling all bridges in the
+ *				   encoder chain
  * @bridge: bridge control structure
  *
  * Calls &drm_bridge_funcs.post_disable op for all the bridges in the
@@ -269,7 +272,7 @@ EXPORT_SYMBOL(drm_bridge_disable);
  *
  * Note: the bridge passed should be the one closest to the encoder
  */
-void drm_bridge_post_disable(struct drm_bridge *bridge)
+void drm_bridge_chain_post_disable(struct drm_bridge *bridge)
 {
 	if (!bridge)
 		return;
@@ -277,25 +280,25 @@ void drm_bridge_post_disable(struct drm_bridge *bridge)
 	if (bridge->funcs->post_disable)
 		bridge->funcs->post_disable(bridge);
 
-	drm_bridge_post_disable(bridge->next);
+	drm_bridge_chain_post_disable(bridge->next);
 }
-EXPORT_SYMBOL(drm_bridge_post_disable);
+EXPORT_SYMBOL(drm_bridge_chain_post_disable);
 
 /**
- * drm_bridge_mode_set - set proposed mode for all bridges in the
- *			 encoder chain
+ * drm_bridge_chain_mode_set - set proposed mode for all bridges in the
+ *			       encoder chain
  * @bridge: bridge control structure
- * @mode: desired mode to be set for the bridge
- * @adjusted_mode: updated mode that works for this bridge
+ * @mode: desired mode to be set for the encoder chain
+ * @adjusted_mode: updated mode that works for this encoder chain
  *
  * Calls &drm_bridge_funcs.mode_set op for all the bridges in the
  * encoder chain, starting from the first bridge to the last.
  *
  * Note: the bridge passed should be the one closest to the encoder
  */
-void drm_bridge_mode_set(struct drm_bridge *bridge,
-			 const struct drm_display_mode *mode,
-			 const struct drm_display_mode *adjusted_mode)
+void drm_bridge_chain_mode_set(struct drm_bridge *bridge,
+			       const struct drm_display_mode *mode,
+			       const struct drm_display_mode *adjusted_mode)
 {
 	if (!bridge)
 		return;
@@ -303,13 +306,13 @@ void drm_bridge_mode_set(struct drm_bridge *bridge,
 	if (bridge->funcs->mode_set)
 		bridge->funcs->mode_set(bridge, mode, adjusted_mode);
 
-	drm_bridge_mode_set(bridge->next, mode, adjusted_mode);
+	drm_bridge_chain_mode_set(bridge->next, mode, adjusted_mode);
 }
-EXPORT_SYMBOL(drm_bridge_mode_set);
+EXPORT_SYMBOL(drm_bridge_chain_mode_set);
 
 /**
- * drm_bridge_pre_enable - prepares for enabling all
- *			   bridges in the encoder chain
+ * drm_bridge_chain_pre_enable - prepares for enabling all bridges in the
+ *				 encoder chain
  * @bridge: bridge control structure
  *
  * Calls &drm_bridge_funcs.pre_enable op for all the bridges in the encoder
@@ -318,20 +321,20 @@ EXPORT_SYMBOL(drm_bridge_mode_set);
  *
  * Note: the bridge passed should be the one closest to the encoder
  */
-void drm_bridge_pre_enable(struct drm_bridge *bridge)
+void drm_bridge_chain_pre_enable(struct drm_bridge *bridge)
 {
 	if (!bridge)
 		return;
 
-	drm_bridge_pre_enable(bridge->next);
+	drm_bridge_chain_pre_enable(bridge->next);
 
 	if (bridge->funcs->pre_enable)
 		bridge->funcs->pre_enable(bridge);
 }
-EXPORT_SYMBOL(drm_bridge_pre_enable);
+EXPORT_SYMBOL(drm_bridge_chain_pre_enable);
 
 /**
- * drm_bridge_enable - enables all bridges in the encoder chain
+ * drm_bridge_chain_enable - enables all bridges in the encoder chain
  * @bridge: bridge control structure
  *
  * Calls &drm_bridge_funcs.enable op for all the bridges in the encoder
@@ -340,7 +343,7 @@ EXPORT_SYMBOL(drm_bridge_pre_enable);
  *
  * Note that the bridge passed should be the one closest to the encoder
  */
-void drm_bridge_enable(struct drm_bridge *bridge)
+void drm_bridge_chain_enable(struct drm_bridge *bridge)
 {
 	if (!bridge)
 		return;
@@ -348,12 +351,12 @@ void drm_bridge_enable(struct drm_bridge *bridge)
 	if (bridge->funcs->enable)
 		bridge->funcs->enable(bridge);
 
-	drm_bridge_enable(bridge->next);
+	drm_bridge_chain_enable(bridge->next);
 }
-EXPORT_SYMBOL(drm_bridge_enable);
+EXPORT_SYMBOL(drm_bridge_chain_enable);
 
 /**
- * drm_atomic_bridge_disable - disables all bridges in the encoder chain
+ * drm_atomic_bridge_chain_disable - disables all bridges in the encoder chain
  * @bridge: bridge control structure
  * @state: atomic state being committed
  *
@@ -364,24 +367,24 @@ EXPORT_SYMBOL(drm_bridge_enable);
  *
  * Note: the bridge passed should be the one closest to the encoder
  */
-void drm_atomic_bridge_disable(struct drm_bridge *bridge,
-			       struct drm_atomic_state *state)
+void drm_atomic_bridge_chain_disable(struct drm_bridge *bridge,
+				     struct drm_atomic_state *state)
 {
 	if (!bridge)
 		return;
 
-	drm_atomic_bridge_disable(bridge->next, state);
+	drm_atomic_bridge_chain_disable(bridge->next, state);
 
 	if (bridge->funcs->atomic_disable)
 		bridge->funcs->atomic_disable(bridge, state);
 	else if (bridge->funcs->disable)
 		bridge->funcs->disable(bridge);
 }
-EXPORT_SYMBOL(drm_atomic_bridge_disable);
+EXPORT_SYMBOL(drm_atomic_bridge_chain_disable);
 
 /**
- * drm_atomic_bridge_post_disable - cleans up after disabling all bridges in the
- *				    encoder chain
+ * drm_atomic_bridge_chain_post_disable - cleans up after disabling all bridges
+ *					  in the encoder chain
  * @bridge: bridge control structure
  * @state: atomic state being committed
  *
@@ -392,8 +395,8 @@ EXPORT_SYMBOL(drm_atomic_bridge_disable);
  *
  * Note: the bridge passed should be the one closest to the encoder
  */
-void drm_atomic_bridge_post_disable(struct drm_bridge *bridge,
-				    struct drm_atomic_state *state)
+void drm_atomic_bridge_chain_post_disable(struct drm_bridge *bridge,
+					  struct drm_atomic_state *state)
 {
 	if (!bridge)
 		return;
@@ -403,13 +406,13 @@ void drm_atomic_bridge_post_disable(struct drm_bridge *bridge,
 	else if (bridge->funcs->post_disable)
 		bridge->funcs->post_disable(bridge);
 
-	drm_atomic_bridge_post_disable(bridge->next, state);
+	drm_atomic_bridge_chain_post_disable(bridge->next, state);
 }
-EXPORT_SYMBOL(drm_atomic_bridge_post_disable);
+EXPORT_SYMBOL(drm_atomic_bridge_chain_post_disable);
 
 /**
- * drm_atomic_bridge_pre_enable - prepares for enabling all bridges in the
- *				  encoder chain
+ * drm_atomic_bridge_chain_pre_enable - prepares for enabling all bridges in
+ *					the encoder chain
  * @bridge: bridge control structure
  * @state: atomic state being committed
  *
@@ -420,23 +423,23 @@ EXPORT_SYMBOL(drm_atomic_bridge_post_disable);
  *
  * Note: the bridge passed should be the one closest to the encoder
  */
-void drm_atomic_bridge_pre_enable(struct drm_bridge *bridge,
-				  struct drm_atomic_state *state)
+void drm_atomic_bridge_chain_pre_enable(struct drm_bridge *bridge,
+					struct drm_atomic_state *state)
 {
 	if (!bridge)
 		return;
 
-	drm_atomic_bridge_pre_enable(bridge->next, state);
+	drm_atomic_bridge_chain_pre_enable(bridge->next, state);
 
 	if (bridge->funcs->atomic_pre_enable)
 		bridge->funcs->atomic_pre_enable(bridge, state);
 	else if (bridge->funcs->pre_enable)
 		bridge->funcs->pre_enable(bridge);
 }
-EXPORT_SYMBOL(drm_atomic_bridge_pre_enable);
+EXPORT_SYMBOL(drm_atomic_bridge_chain_pre_enable);
 
 /**
- * drm_atomic_bridge_enable - enables all bridges in the encoder chain
+ * drm_atomic_bridge_chain_enable - enables all bridges in the encoder chain
  * @bridge: bridge control structure
  * @state: atomic state being committed
  *
@@ -447,8 +450,8 @@ EXPORT_SYMBOL(drm_atomic_bridge_pre_enable);
  *
  * Note: the bridge passed should be the one closest to the encoder
  */
-void drm_atomic_bridge_enable(struct drm_bridge *bridge,
-			      struct drm_atomic_state *state)
+void drm_atomic_bridge_chain_enable(struct drm_bridge *bridge,
+				    struct drm_atomic_state *state)
 {
 	if (!bridge)
 		return;
@@ -458,9 +461,9 @@ void drm_atomic_bridge_enable(struct drm_bridge *bridge,
 	else if (bridge->funcs->enable)
 		bridge->funcs->enable(bridge);
 
-	drm_atomic_bridge_enable(bridge->next, state);
+	drm_atomic_bridge_chain_enable(bridge->next, state);
 }
-EXPORT_SYMBOL(drm_atomic_bridge_enable);
+EXPORT_SYMBOL(drm_atomic_bridge_chain_enable);
 
 #ifdef CONFIG_OF
 /**
diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index c80e33a84605..18cdf9b8fdb0 100644
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -160,14 +160,14 @@ drm_encoder_disable(struct drm_encoder *encoder)
 	if (!encoder_funcs)
 		return;
 
-	drm_bridge_disable(&encoder->bridge);
+	drm_bridge_chain_disable(&encoder->bridge);
 
 	if (encoder_funcs->disable)
 		(*encoder_funcs->disable)(encoder);
 	else if (encoder_funcs->dpms)
 		(*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 
-	drm_bridge_post_disable(&encoder->bridge);
+	drm_bridge_chain_post_disable(&encoder->bridge);
 }
 
 static void __drm_helper_disable_unused_functions(struct drm_device *dev)
@@ -327,8 +327,8 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 		if (!encoder_funcs)
 			continue;
 
-		ret = drm_bridge_mode_fixup(&encoder->bridge, mode,
-					    adjusted_mode);
+		ret = drm_bridge_chain_mode_fixup(&encoder->bridge, mode,
+						  adjusted_mode);
 		if (!ret) {
 			DRM_DEBUG_KMS("Bridge fixup failed\n");
 			goto done;
@@ -365,13 +365,13 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 		if (!encoder_funcs)
 			continue;
 
-		drm_bridge_disable(&encoder->bridge);
+		drm_bridge_chain_disable(&encoder->bridge);
 
 		/* Disable the encoders as the first thing we do. */
 		if (encoder_funcs->prepare)
 			encoder_funcs->prepare(encoder);
 
-		drm_bridge_post_disable(&encoder->bridge);
+		drm_bridge_chain_post_disable(&encoder->bridge);
 	}
 
 	drm_crtc_prepare_encoders(dev);
@@ -399,7 +399,8 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 		if (encoder_funcs->mode_set)
 			encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 
-		drm_bridge_mode_set(&encoder->bridge, mode, adjusted_mode);
+		drm_bridge_chain_mode_set(&encoder->bridge, mode,
+					  adjusted_mode);
 	}
 
 	/* Now enable the clocks, plane, pipe, and connectors that we set up. */
@@ -414,12 +415,12 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 		if (!encoder_funcs)
 			continue;
 
-		drm_bridge_pre_enable(&encoder->bridge);
+		drm_bridge_chain_pre_enable(&encoder->bridge);
 
 		if (encoder_funcs->commit)
 			encoder_funcs->commit(encoder);
 
-		drm_bridge_enable(&encoder->bridge);
+		drm_bridge_chain_enable(&encoder->bridge);
 	}
 
 	/* Calculate and store various constants which
@@ -818,7 +819,6 @@ static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 /* Helper which handles bridge ordering around encoder dpms */
 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
 {
-	struct drm_bridge *bridge = &encoder->bridge;
 	const struct drm_encoder_helper_funcs *encoder_funcs;
 
 	encoder_funcs = encoder->helper_private;
@@ -826,17 +826,17 @@ static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
 		return;
 
 	if (mode == DRM_MODE_DPMS_ON)
-		drm_bridge_pre_enable(bridge);
+		drm_bridge_chain_pre_enable(&encoder->bridge);
 	else
-		drm_bridge_disable(bridge);
+		drm_bridge_chain_disable(&encoder->bridge);
 
 	if (encoder_funcs->dpms)
 		encoder_funcs->dpms(encoder, mode);
 
 	if (mode == DRM_MODE_DPMS_ON)
-		drm_bridge_enable(bridge);
+		drm_bridge_chain_enable(&encoder->bridge);
 	else
-		drm_bridge_post_disable(bridge);
+		drm_bridge_chain_post_disable(&encoder->bridge);
 }
 
 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
index e4af2f9fa372..a5c49b1bef2d 100644
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -113,7 +113,7 @@ drm_mode_validate_pipeline(struct drm_display_mode *mode,
 			continue;
 		}
 
-		ret = drm_bridge_mode_valid(&encoder->bridge, mode);
+		ret = drm_bridge_chain_mode_valid(&encoder->bridge, mode);
 		if (ret != MODE_OK) {
 			/* There is also no point in continuing for crtc check
 			 * here. */
diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index c79b1f855d89..ea68b5adccbe 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -1247,8 +1247,8 @@ static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
 		struct drm_display_mode adjusted_mode;
 
 		drm_mode_copy(&adjusted_mode, mode);
-		if (!drm_bridge_mode_fixup(hdmi->bridge.next, mode,
-					   &adjusted_mode))
+		if (!drm_bridge_chain_mode_fixup(hdmi->bridge.next, mode,
+						 &adjusted_mode))
 			return MODE_BAD;
 	}
 
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 7616f6562fe4..442a0654e1bf 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -254,9 +254,10 @@ struct drm_bridge_funcs {
 	 * there is one) when this callback is called.
 	 *
 	 * Note that this function will only be invoked in the context of an
-	 * atomic commit. It will not be invoked from &drm_bridge_pre_enable. It
-	 * would be prudent to also provide an implementation of @pre_enable if
-	 * you are expecting driver calls into &drm_bridge_pre_enable.
+	 * atomic commit. It will not be invoked from
+	 * &drm_bridge_chain_pre_enable. It would be prudent to also provide an
+	 * implementation of @pre_enable if you are expecting driver calls into
+	 * &drm_bridge_chain_pre_enable.
 	 *
 	 * The @atomic_pre_enable callback is optional.
 	 */
@@ -279,9 +280,9 @@ struct drm_bridge_funcs {
 	 * chain if there is one.
 	 *
 	 * Note that this function will only be invoked in the context of an
-	 * atomic commit. It will not be invoked from &drm_bridge_enable. It
-	 * would be prudent to also provide an implementation of @enable if
-	 * you are expecting driver calls into &drm_bridge_enable.
+	 * atomic commit. It will not be invoked from &drm_bridge_chain_enable.
+	 * It would be prudent to also provide an implementation of @enable if
+	 * you are expecting driver calls into &drm_bridge_chain_enable.
 	 *
 	 * The enable callback is optional.
 	 */
@@ -301,9 +302,10 @@ struct drm_bridge_funcs {
 	 * signals) feeding it is still running when this callback is called.
 	 *
 	 * Note that this function will only be invoked in the context of an
-	 * atomic commit. It will not be invoked from &drm_bridge_disable. It
-	 * would be prudent to also provide an implementation of @disable if
-	 * you are expecting driver calls into &drm_bridge_disable.
+	 * atomic commit. It will not be invoked from
+	 * &drm_bridge_chain_disable. It would be prudent to also provide an
+	 * implementation of @disable if you are expecting driver calls into
+	 * &drm_bridge_chain_disable.
 	 *
 	 * The disable callback is optional.
 	 */
@@ -325,10 +327,11 @@ struct drm_bridge_funcs {
 	 * called.
 	 *
 	 * Note that this function will only be invoked in the context of an
-	 * atomic commit. It will not be invoked from &drm_bridge_post_disable.
+	 * atomic commit. It will not be invoked from
+	 * &drm_bridge_chain_post_disable.
 	 * It would be prudent to also provide an implementation of
 	 * @post_disable if you are expecting driver calls into
-	 * &drm_bridge_post_disable.
+	 * &drm_bridge_chain_post_disable.
 	 *
 	 * The post_disable callback is optional.
 	 */
@@ -406,27 +409,28 @@ struct drm_bridge *of_drm_find_bridge(struct device_node *np);
 int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
 		      struct drm_bridge *previous);
 
-bool drm_bridge_mode_fixup(struct drm_bridge *bridge,
-			   const struct drm_display_mode *mode,
-			   struct drm_display_mode *adjusted_mode);
-enum drm_mode_status drm_bridge_mode_valid(struct drm_bridge *bridge,
-					   const struct drm_display_mode *mode);
-void drm_bridge_disable(struct drm_bridge *bridge);
-void drm_bridge_post_disable(struct drm_bridge *bridge);
-void drm_bridge_mode_set(struct drm_bridge *bridge,
-			 const struct drm_display_mode *mode,
-			 const struct drm_display_mode *adjusted_mode);
-void drm_bridge_pre_enable(struct drm_bridge *bridge);
-void drm_bridge_enable(struct drm_bridge *bridge);
+bool drm_bridge_chain_mode_fixup(struct drm_bridge *bridge,
+				 const struct drm_display_mode *mode,
+				 struct drm_display_mode *adjusted_mode);
+enum drm_mode_status
+drm_bridge_chain_mode_valid(struct drm_bridge *bridge,
+			    const struct drm_display_mode *mode);
+void drm_bridge_chain_disable(struct drm_bridge *bridge);
+void drm_bridge_chain_post_disable(struct drm_bridge *bridge);
+void drm_bridge_chain_mode_set(struct drm_bridge *bridge,
+			       const struct drm_display_mode *mode,
+			       const struct drm_display_mode *adjusted_mode);
+void drm_bridge_chain_pre_enable(struct drm_bridge *bridge);
+void drm_bridge_chain_enable(struct drm_bridge *bridge);
 
-void drm_atomic_bridge_disable(struct drm_bridge *bridge,
-			       struct drm_atomic_state *state);
-void drm_atomic_bridge_post_disable(struct drm_bridge *bridge,
+void drm_atomic_bridge_chain_disable(struct drm_bridge *bridge,
+				     struct drm_atomic_state *state);
+void drm_atomic_bridge_chain_post_disable(struct drm_bridge *bridge,
+					  struct drm_atomic_state *state);
+void drm_atomic_bridge_chain_pre_enable(struct drm_bridge *bridge,
+					struct drm_atomic_state *state);
+void drm_atomic_bridge_chain_enable(struct drm_bridge *bridge,
 				    struct drm_atomic_state *state);
-void drm_atomic_bridge_pre_enable(struct drm_bridge *bridge,
-				  struct drm_atomic_state *state);
-void drm_atomic_bridge_enable(struct drm_bridge *bridge,
-			      struct drm_atomic_state *state);
 
 #ifdef CONFIG_DRM_PANEL_BRIDGE
 struct drm_bridge *drm_panel_bridge_add(struct drm_panel *panel,

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To: dri-devel@lists.freedesktop.org
Subject: [PATCH v2 08/21] drm/msm: Use drm_attach_bridge() to attach a bridge
 to an encoder
Date: Mon, 26 Aug 2019 17:26:36 +0200
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This is part of our attempt to make the bridge chain a double-linked
list based on the generic list helpers. In order to do that, we must
patch all drivers manipulating the encoder->bridge field directly.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sean Paul <sean@poorly.run>
---
Changes in v2:
* Add Laurent and Sam R-b (waiting for a R-b from a drm/msm maintainer
  now)
---
 drivers/gpu/drm/msm/edp/edp.c   | 4 +++-
 drivers/gpu/drm/msm/hdmi/hdmi.c | 4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/edp/edp.c b/drivers/gpu/drm/msm/edp/edp.c
index b54559a79d36..ad4e963ccd9b 100644
--- a/drivers/gpu/drm/msm/edp/edp.c
+++ b/drivers/gpu/drm/msm/edp/edp.c
@@ -178,7 +178,9 @@ int msm_edp_modeset_init(struct msm_edp *edp, struct drm_device *dev,
 		goto fail;
 	}
 
-	encoder->bridge.next = edp->bridge;
+	ret = drm_bridge_attach(encoder, edp->bridge, NULL);
+	if (ret)
+		goto fail;
 
 	priv->bridges[priv->num_bridges++]       = edp->bridge;
 	priv->connectors[priv->num_connectors++] = edp->connector;
diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.c b/drivers/gpu/drm/msm/hdmi/hdmi.c
index 9d94a88dd8d6..55b9a8c8312b 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi.c
@@ -327,7 +327,9 @@ int msm_hdmi_modeset_init(struct hdmi *hdmi,
 		goto fail;
 	}
 
-	encoder->bridge.next = hdmi->bridge;
+	ret = drm_bridge_attach(encoder, hdmi->bridge, NULL);
+	if (ret)
+		goto fail;
 
 	priv->bridges[priv->num_bridges++]       = hdmi->bridge;
 	priv->connectors[priv->num_connectors++] = hdmi->connector;

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Subject: [PATCH v2 09/21] drm/bridge: Introduce
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And use it in drivers accessing the bridge->next field directly.
This is part of our attempt to make the bridge chain a double-linked list
based on the generic list helpers.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
---
Changes in v2:
* Kill the last/first helpers (they're not really needed)
* Drop the !bridge || !bridge->encoder test
---
 drivers/gpu/drm/drm_bridge.c           | 14 ++++++++++++++
 drivers/gpu/drm/mediatek/mtk_hdmi.c    |  6 ++++--
 drivers/gpu/drm/msm/edp/edp_bridge.c   | 10 ++++++++--
 drivers/gpu/drm/omapdrm/omap_drv.c     |  4 ++--
 drivers/gpu/drm/omapdrm/omap_encoder.c |  3 ++-
 drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 10 +++++++---
 drivers/gpu/drm/vc4/vc4_dsi.c          |  4 +++-
 include/drm/drm_bridge.h               |  2 ++
 8 files changed, 42 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index 52f1263530b7..3d9a6c6a7d4e 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -160,6 +160,20 @@ void drm_bridge_detach(struct drm_bridge *bridge)
 	bridge->dev = NULL;
 }
 
+/**
+ * drm_bridge_chain_get_next_bridge() - Get the next bridge in the chain
+ * @bridge: bridge object
+ *
+ * RETURNS:
+ * the next bridge in the chain, or NULL if @bridge is the last.
+ */
+struct drm_bridge *
+drm_bridge_chain_get_next_bridge(struct drm_bridge *bridge)
+{
+	return bridge->next;
+}
+EXPORT_SYMBOL(drm_bridge_chain_get_next_bridge);
+
 /**
  * DOC: bridge callbacks
  *
diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index ea68b5adccbe..cfaa5aab8876 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -1238,16 +1238,18 @@ static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
 				    struct drm_display_mode *mode)
 {
 	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
+	struct drm_bridge *next_bridge;
 
 	dev_dbg(hdmi->dev, "xres=%d, yres=%d, refresh=%d, intl=%d clock=%d\n",
 		mode->hdisplay, mode->vdisplay, mode->vrefresh,
 		!!(mode->flags & DRM_MODE_FLAG_INTERLACE), mode->clock * 1000);
 
-	if (hdmi->bridge.next) {
+	next_bridge = drm_bridge_chain_get_next_bridge(&hdmi->bridge);
+	if (next_bridge) {
 		struct drm_display_mode adjusted_mode;
 
 		drm_mode_copy(&adjusted_mode, mode);
-		if (!drm_bridge_chain_mode_fixup(hdmi->bridge.next, mode,
+		if (!drm_bridge_chain_mode_fixup(next_bridge, mode,
 						 &adjusted_mode))
 			return MODE_BAD;
 	}
diff --git a/drivers/gpu/drm/msm/edp/edp_bridge.c b/drivers/gpu/drm/msm/edp/edp_bridge.c
index 446acca110e9..772408c94643 100644
--- a/drivers/gpu/drm/msm/edp/edp_bridge.c
+++ b/drivers/gpu/drm/msm/edp/edp_bridge.c
@@ -55,8 +55,14 @@ static void edp_bridge_mode_set(struct drm_bridge *bridge,
 	DBG("set mode: " DRM_MODE_FMT, DRM_MODE_ARG(mode));
 
 	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
-		if ((connector->encoder != NULL) &&
-			(connector->encoder->bridge.next == bridge)) {
+		struct drm_encoder *encoder = connector->encoder;
+		struct drm_bridge *first_bridge;
+
+		if (!encoder)
+			continue;
+
+		first_bridge = drm_bridge_chain_get_next_bridge(&encoder->bridge);
+		if (bridge == first_bridge) {
 			msm_edp_ctrl_timing_cfg(edp->ctrl,
 				adjusted_mode, &connector->display_info);
 			break;
diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c
index 224ec6fdc800..ba59881bcf3f 100644
--- a/drivers/gpu/drm/omapdrm/omap_drv.c
+++ b/drivers/gpu/drm/omapdrm/omap_drv.c
@@ -217,8 +217,8 @@ static int omap_display_id(struct omap_dss_device *output)
 	} else if (output->bridge) {
 		struct drm_bridge *bridge = output->bridge;
 
-		while (bridge->next)
-			bridge = bridge->next;
+		while (drm_bridge_chain_get_next_bridge(bridge))
+			bridge = drm_bridge_chain_get_next_bridge(bridge);
 
 		node = bridge->of_node;
 	} else if (output->panel) {
diff --git a/drivers/gpu/drm/omapdrm/omap_encoder.c b/drivers/gpu/drm/omapdrm/omap_encoder.c
index 24bbe9f2a32e..8ca54081997e 100644
--- a/drivers/gpu/drm/omapdrm/omap_encoder.c
+++ b/drivers/gpu/drm/omapdrm/omap_encoder.c
@@ -126,7 +126,8 @@ static void omap_encoder_mode_set(struct drm_encoder *encoder,
 	for (dssdev = output; dssdev; dssdev = dssdev->next)
 		omap_encoder_update_videomode_flags(&vm, dssdev->bus_flags);
 
-	for (bridge = output->bridge; bridge; bridge = bridge->next) {
+	for (bridge = output->bridge; bridge;
+	     bridge = drm_bridge_chain_get_next_bridge(bridge)) {
 		if (!bridge->timings)
 			continue;
 
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
index 1bd748202946..bcccdccd2878 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
@@ -14,6 +14,7 @@
 
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_device.h>
 #include <drm/drm_fb_cma_helper.h>
@@ -680,9 +681,10 @@ static void rcar_du_crtc_atomic_enable(struct drm_crtc *crtc,
 			rcdu->encoders[RCAR_DU_OUTPUT_LVDS0 + rcrtc->index];
 		const struct drm_display_mode *mode =
 			&crtc->state->adjusted_mode;
+		struct drm_bridge *bridge;
 
-		rcar_lvds_clk_enable(encoder->base.bridge.next,
-				     mode->clock * 1000);
+		bridge = drm_bridge_chain_get_next_bridge(&encoder->base.bridge);
+		rcar_lvds_clk_enable(bridge, mode->clock * 1000);
 	}
 
 	rcar_du_crtc_start(rcrtc);
@@ -702,12 +704,14 @@ static void rcar_du_crtc_atomic_disable(struct drm_crtc *crtc,
 	    rstate->outputs == BIT(RCAR_DU_OUTPUT_DPAD0)) {
 		struct rcar_du_encoder *encoder =
 			rcdu->encoders[RCAR_DU_OUTPUT_LVDS0 + rcrtc->index];
+		struct drm_bridge *bridge;
 
 		/*
 		 * Disable the LVDS clock output, see
 		 * rcar_du_crtc_atomic_enable().
 		 */
-		rcar_lvds_clk_disable(encoder->base.bridge.next);
+		bridge = drm_bridge_chain_get_next_bridge(&encoder->base.bridge);
+		rcar_lvds_clk_disable(bridge);
 	}
 
 	spin_lock_irq(&crtc->dev->event_lock);
diff --git a/drivers/gpu/drm/vc4/vc4_dsi.c b/drivers/gpu/drm/vc4/vc4_dsi.c
index 4aa4c1a94f17..4ea352567cfb 100644
--- a/drivers/gpu/drm/vc4/vc4_dsi.c
+++ b/drivers/gpu/drm/vc4/vc4_dsi.c
@@ -1636,8 +1636,10 @@ static void vc4_dsi_unbind(struct device *dev, struct device *master,
 	struct drm_device *drm = dev_get_drvdata(master);
 	struct vc4_dev *vc4 = to_vc4_dev(drm);
 	struct vc4_dsi *dsi = dev_get_drvdata(dev);
+	struct drm_bridge *bridge;
 
-	if (dsi->encoder->bridge.next)
+	bridge = drm_bridge_chain_get_next_bridge(&dsi->encoder->bridge);
+	if (bridge)
 		pm_runtime_disable(dev);
 
 	vc4_dsi_encoder_destroy(dsi->encoder);
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 442a0654e1bf..7809fca99b2d 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -409,6 +409,8 @@ struct drm_bridge *of_drm_find_bridge(struct device_node *np);
 int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
 		      struct drm_bridge *previous);
 
+struct drm_bridge *
+drm_bridge_chain_get_next_bridge(struct drm_bridge *bridge);
 bool drm_bridge_chain_mode_fixup(struct drm_bridge *bridge,
 				 const struct drm_display_mode *mode,
 				 struct drm_display_mode *adjusted_mode);

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From: Boris Brezillon <boris.brezillon@collabora.com>
To: dri-devel@lists.freedesktop.org
Subject: [PATCH v2 10/21] drm/bridge: Make the bridge chain a double-linked
 list
Date: Mon, 26 Aug 2019 17:26:38 +0200
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Cc: Nikita Yushchenko <nikita.yoush@cogentembedded.com>,
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 Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
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 Seung-Woo Kim <sw0312.kim@samsung.com>,
 Kyungmin Park <kyungmin.park@samsung.com>,
 Thierry Reding <thierry.reding@gmail.com>,
 Chris Healy <Chris.Healy@zii.aero>,
 Boris Brezillon <boris.brezillon@collabora.com>, kernel@collabora.com,
 Sam Ravnborg <sam@ravnborg.org>
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So that each element in the chain can easily access its predecessor.
This will be needed to support bus format negotiation between elements
of the bridge chain.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
Changes in v2:
* Adjust things to the "dummy encoder bridge" change (patch 2 in this
  series)
---
 drivers/gpu/drm/drm_bridge.c  | 177 ++++++++++++++++++----------------
 drivers/gpu/drm/drm_encoder.c |   6 +-
 include/drm/drm_bridge.h      |   4 +-
 include/drm/drm_encoder.h     |   7 ++
 4 files changed, 107 insertions(+), 87 deletions(-)

diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index 3d9a6c6a7d4e..695ad67d33a5 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -55,7 +55,7 @@
  * just provide additional hooks to get the desired output at the end of the
  * encoder chain.
  *
- * Bridges can also be chained up using the &drm_bridge.next pointer.
+ * Bridges can also be chained up using the &drm_bridge.chain_node field.
  *
  * Both legacy CRTC helpers and the new atomic modeset helpers support bridges.
  */
@@ -114,6 +114,7 @@ EXPORT_SYMBOL(drm_bridge_remove);
 int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
 		      struct drm_bridge *previous)
 {
+	LIST_HEAD(tmp_list);
 	int ret;
 
 	if (!encoder || !bridge)
@@ -127,6 +128,7 @@ int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
 
 	bridge->dev = encoder->dev;
 	bridge->encoder = encoder;
+	list_add_tail(&bridge->chain_node, &tmp_list);
 
 	if (bridge->funcs->attach) {
 		ret = bridge->funcs->attach(bridge);
@@ -137,10 +139,12 @@ int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
 		}
 	}
 
-	if (previous)
-		previous->next = bridge;
-	else if (bridge != &encoder->bridge)
-		encoder->bridge.next = bridge;
+	if (bridge == &encoder->bridge)
+		list_splice(&tmp_list, &encoder->bridge_chain);
+	else if (!previous)
+		list_splice(&tmp_list, &encoder->bridge.chain_node);
+	else
+		list_splice(&tmp_list, &previous->chain_node);
 
 	return 0;
 }
@@ -157,6 +161,7 @@ void drm_bridge_detach(struct drm_bridge *bridge)
 	if (bridge->funcs->detach)
 		bridge->funcs->detach(bridge);
 
+	list_del(&bridge->chain_node);
 	bridge->dev = NULL;
 }
 
@@ -170,7 +175,10 @@ void drm_bridge_detach(struct drm_bridge *bridge)
 struct drm_bridge *
 drm_bridge_chain_get_next_bridge(struct drm_bridge *bridge)
 {
-	return bridge->next;
+	if (list_is_last(&bridge->chain_node, &bridge->encoder->bridge_chain))
+		return NULL;
+
+	return list_next_entry(bridge, chain_node);
 }
 EXPORT_SYMBOL(drm_bridge_chain_get_next_bridge);
 
@@ -204,18 +212,17 @@ bool drm_bridge_chain_mode_fixup(struct drm_bridge *bridge,
 				 const struct drm_display_mode *mode,
 				 struct drm_display_mode *adjusted_mode)
 {
-	bool ret = true;
+	struct drm_encoder *encoder = bridge->encoder;
 
-	if (!bridge)
-		return true;
+	list_for_each_entry_from(bridge, &encoder->bridge_chain, chain_node) {
+		if (!bridge->funcs->mode_fixup)
+			continue;
 
-	if (bridge->funcs->mode_fixup)
-		ret = bridge->funcs->mode_fixup(bridge, mode, adjusted_mode);
+		if (!bridge->funcs->mode_fixup(bridge, mode, adjusted_mode))
+			return false;
+	}
 
-	ret = ret && drm_bridge_chain_mode_fixup(bridge->next, mode,
-						 adjusted_mode);
-
-	return ret;
+	return true;
 }
 EXPORT_SYMBOL(drm_bridge_chain_mode_fixup);
 
@@ -238,18 +245,20 @@ enum drm_mode_status
 drm_bridge_chain_mode_valid(struct drm_bridge *bridge,
 			    const struct drm_display_mode *mode)
 {
-	enum drm_mode_status ret = MODE_OK;
+	struct drm_encoder *encoder = bridge->encoder;
 
-	if (!bridge)
-		return ret;
+	list_for_each_entry_from(bridge, &encoder->bridge_chain, chain_node) {
+		enum drm_mode_status ret;
+
+		if (!bridge->funcs->mode_valid)
+			continue;
 
-	if (bridge->funcs->mode_valid)
 		ret = bridge->funcs->mode_valid(bridge, mode);
+		if (ret != MODE_OK)
+			return ret;
+	}
 
-	if (ret != MODE_OK)
-		return ret;
-
-	return drm_bridge_chain_mode_valid(bridge->next, mode);
+	return MODE_OK;
 }
 EXPORT_SYMBOL(drm_bridge_chain_mode_valid);
 
@@ -265,13 +274,16 @@ EXPORT_SYMBOL(drm_bridge_chain_mode_valid);
  */
 void drm_bridge_chain_disable(struct drm_bridge *bridge)
 {
-	if (!bridge)
-		return;
+	struct drm_encoder *encoder = bridge->encoder;
+	struct drm_bridge *iter;
 
-	drm_bridge_chain_disable(bridge->next);
+	list_for_each_entry_reverse(iter, &encoder->bridge_chain, chain_node) {
+		if (iter->funcs->disable)
+			iter->funcs->disable(iter);
 
-	if (bridge->funcs->disable)
-		bridge->funcs->disable(bridge);
+		if (iter == bridge)
+			break;
+	}
 }
 EXPORT_SYMBOL(drm_bridge_chain_disable);
 
@@ -288,13 +300,12 @@ EXPORT_SYMBOL(drm_bridge_chain_disable);
  */
 void drm_bridge_chain_post_disable(struct drm_bridge *bridge)
 {
-	if (!bridge)
-		return;
+	struct drm_encoder *encoder = bridge->encoder;
 
-	if (bridge->funcs->post_disable)
-		bridge->funcs->post_disable(bridge);
-
-	drm_bridge_chain_post_disable(bridge->next);
+	list_for_each_entry_from(bridge, &encoder->bridge_chain, chain_node) {
+		if (bridge->funcs->post_disable)
+			bridge->funcs->post_disable(bridge);
+	}
 }
 EXPORT_SYMBOL(drm_bridge_chain_post_disable);
 
@@ -314,13 +325,12 @@ void drm_bridge_chain_mode_set(struct drm_bridge *bridge,
 			       const struct drm_display_mode *mode,
 			       const struct drm_display_mode *adjusted_mode)
 {
-	if (!bridge)
-		return;
+	struct drm_encoder *encoder = bridge->encoder;
 
-	if (bridge->funcs->mode_set)
-		bridge->funcs->mode_set(bridge, mode, adjusted_mode);
-
-	drm_bridge_chain_mode_set(bridge->next, mode, adjusted_mode);
+	list_for_each_entry_from(bridge, &encoder->bridge_chain, chain_node) {
+		if (bridge->funcs->mode_set)
+			bridge->funcs->mode_set(bridge, mode, adjusted_mode);
+	}
 }
 EXPORT_SYMBOL(drm_bridge_chain_mode_set);
 
@@ -337,13 +347,13 @@ EXPORT_SYMBOL(drm_bridge_chain_mode_set);
  */
 void drm_bridge_chain_pre_enable(struct drm_bridge *bridge)
 {
-	if (!bridge)
-		return;
+	struct drm_encoder *encoder = bridge->encoder;
+	struct drm_bridge *iter;
 
-	drm_bridge_chain_pre_enable(bridge->next);
-
-	if (bridge->funcs->pre_enable)
-		bridge->funcs->pre_enable(bridge);
+	list_for_each_entry_reverse(iter, &encoder->bridge_chain, chain_node) {
+		if (iter->funcs->pre_enable)
+			iter->funcs->pre_enable(iter);
+	}
 }
 EXPORT_SYMBOL(drm_bridge_chain_pre_enable);
 
@@ -359,13 +369,12 @@ EXPORT_SYMBOL(drm_bridge_chain_pre_enable);
  */
 void drm_bridge_chain_enable(struct drm_bridge *bridge)
 {
-	if (!bridge)
-		return;
+	struct drm_encoder *encoder = bridge->encoder;
 
-	if (bridge->funcs->enable)
-		bridge->funcs->enable(bridge);
-
-	drm_bridge_chain_enable(bridge->next);
+	list_for_each_entry_from(bridge, &encoder->bridge_chain, chain_node) {
+		if (bridge->funcs->enable)
+			bridge->funcs->enable(bridge);
+	}
 }
 EXPORT_SYMBOL(drm_bridge_chain_enable);
 
@@ -384,15 +393,18 @@ EXPORT_SYMBOL(drm_bridge_chain_enable);
 void drm_atomic_bridge_chain_disable(struct drm_bridge *bridge,
 				     struct drm_atomic_state *state)
 {
-	if (!bridge)
-		return;
+	struct drm_encoder *encoder = bridge->encoder;
+	struct drm_bridge *iter;
 
-	drm_atomic_bridge_chain_disable(bridge->next, state);
+	list_for_each_entry_reverse(iter, &encoder->bridge_chain, chain_node) {
+		if (iter->funcs->atomic_disable)
+			iter->funcs->atomic_disable(iter, state);
+		else if (iter->funcs->disable)
+			iter->funcs->disable(iter);
 
-	if (bridge->funcs->atomic_disable)
-		bridge->funcs->atomic_disable(bridge, state);
-	else if (bridge->funcs->disable)
-		bridge->funcs->disable(bridge);
+		if (iter == bridge)
+			break;
+	}
 }
 EXPORT_SYMBOL(drm_atomic_bridge_chain_disable);
 
@@ -412,15 +424,14 @@ EXPORT_SYMBOL(drm_atomic_bridge_chain_disable);
 void drm_atomic_bridge_chain_post_disable(struct drm_bridge *bridge,
 					  struct drm_atomic_state *state)
 {
-	if (!bridge)
-		return;
+	struct drm_encoder *encoder = bridge->encoder;
 
-	if (bridge->funcs->atomic_post_disable)
-		bridge->funcs->atomic_post_disable(bridge, state);
-	else if (bridge->funcs->post_disable)
-		bridge->funcs->post_disable(bridge);
-
-	drm_atomic_bridge_chain_post_disable(bridge->next, state);
+	list_for_each_entry_from(bridge, &encoder->bridge_chain, chain_node) {
+		if (bridge->funcs->atomic_post_disable)
+			bridge->funcs->atomic_post_disable(bridge, state);
+		else if (bridge->funcs->post_disable)
+			bridge->funcs->post_disable(bridge);
+	}
 }
 EXPORT_SYMBOL(drm_atomic_bridge_chain_post_disable);
 
@@ -440,15 +451,18 @@ EXPORT_SYMBOL(drm_atomic_bridge_chain_post_disable);
 void drm_atomic_bridge_chain_pre_enable(struct drm_bridge *bridge,
 					struct drm_atomic_state *state)
 {
-	if (!bridge)
-		return;
+	struct drm_encoder *encoder = bridge->encoder;
+	struct drm_bridge *iter;
 
-	drm_atomic_bridge_chain_pre_enable(bridge->next, state);
+	list_for_each_entry_reverse(iter, &encoder->bridge_chain, chain_node) {
+		if (iter->funcs->atomic_pre_enable)
+			iter->funcs->atomic_pre_enable(iter, state);
+		else if (iter->funcs->pre_enable)
+			iter->funcs->pre_enable(iter);
 
-	if (bridge->funcs->atomic_pre_enable)
-		bridge->funcs->atomic_pre_enable(bridge, state);
-	else if (bridge->funcs->pre_enable)
-		bridge->funcs->pre_enable(bridge);
+		if (iter == bridge)
+			break;
+	}
 }
 EXPORT_SYMBOL(drm_atomic_bridge_chain_pre_enable);
 
@@ -467,15 +481,14 @@ EXPORT_SYMBOL(drm_atomic_bridge_chain_pre_enable);
 void drm_atomic_bridge_chain_enable(struct drm_bridge *bridge,
 				    struct drm_atomic_state *state)
 {
-	if (!bridge)
-		return;
+	struct drm_encoder *encoder = bridge->encoder;
 
-	if (bridge->funcs->atomic_enable)
-		bridge->funcs->atomic_enable(bridge, state);
-	else if (bridge->funcs->enable)
-		bridge->funcs->enable(bridge);
-
-	drm_atomic_bridge_chain_enable(bridge->next, state);
+	list_for_each_entry_from(bridge, &encoder->bridge_chain, chain_node) {
+		if (bridge->funcs->atomic_enable)
+			bridge->funcs->atomic_enable(bridge, state);
+		else if (bridge->funcs->enable)
+			bridge->funcs->enable(bridge);
+	}
 }
 EXPORT_SYMBOL(drm_atomic_bridge_chain_enable);
 
diff --git a/drivers/gpu/drm/drm_encoder.c b/drivers/gpu/drm/drm_encoder.c
index 686053bf41b9..9bf642c09c55 100644
--- a/drivers/gpu/drm/drm_encoder.c
+++ b/drivers/gpu/drm/drm_encoder.c
@@ -143,6 +143,7 @@ int drm_encoder_init(struct drm_device *dev,
 		goto out_put;
 	}
 
+	INIT_LIST_HEAD(&encoder->bridge_chain);
 	if (!encoder->bridge.funcs)
 		encoder->bridge.funcs = &dummy_bridge_funcs;
 
@@ -177,10 +178,9 @@ void drm_encoder_cleanup(struct drm_encoder *encoder)
 	 * the indices on the drm_encoder after us in the encoder_list.
 	 */
 
-	for (bridge = &encoder->bridge; bridge; bridge = next) {
-		next = bridge->next;
+	list_for_each_entry_safe(bridge, next, &encoder->bridge_chain,
+				 chain_node)
 		drm_bridge_detach(bridge);
-	}
 
 	drm_mode_object_unregister(dev, &encoder->base);
 	kfree(encoder->name);
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 7809fca99b2d..8af92f0a9541 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -383,8 +383,8 @@ struct drm_bridge {
 	struct drm_device *dev;
 	/** @encoder: encoder to which this bridge is connected */
 	struct drm_encoder *encoder;
-	/** @next: the next bridge in the encoder chain */
-	struct drm_bridge *next;
+	/** @chain_node: used to form a bridge chain */
+	struct list_head chain_node;
 #ifdef CONFIG_OF
 	/** @of_node: device node pointer to the bridge */
 	struct device_node *of_node;
diff --git a/include/drm/drm_encoder.h b/include/drm/drm_encoder.h
index 30d347c37402..b3374d045801 100644
--- a/include/drm/drm_encoder.h
+++ b/include/drm/drm_encoder.h
@@ -173,6 +173,13 @@ struct drm_encoder {
 	 */
 	struct drm_crtc *crtc;
 
+	/**
+	 * @bridge_chain: Bridges attached to this encoder. The first entry of
+	 * this list is always &drm_encoder.bridge. It may be followed by other
+	 * bridge entities.
+	 */
+	struct list_head bridge_chain;
+
 	/**
 	 * @bridge: Bridge representing our encoder. Other bridges might be
 	 * linked to this dummy bridge element to form an encoder chain.

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To: dri-devel@lists.freedesktop.org
Subject: [PATCH v2 11/21] drm/bridge: Add the drm_for_each_bridge_in_chain()
 helper
Date: Mon, 26 Aug 2019 17:26:39 +0200
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To iterate over all bridges attached to a specific encoder.

Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
---
Changes in v2:
* New patch
---
 include/drm/drm_bridge.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 8af92f0a9541..cf05b30f2967 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -409,6 +409,17 @@ struct drm_bridge *of_drm_find_bridge(struct device_node *np);
 int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
 		      struct drm_bridge *previous);
 
+/**
+ * for_each_bridge_in_chain() - Iterate over all bridges present in a chain
+ * @encoder: the encoder to iterate bridges on
+ * @bridge: a bridge pointer updated to point to the current bridge at each
+ *	    iteration
+ *
+ * Iterate over all bridges present in the bridge chain attached to @encoder.
+ */
+#define drm_for_each_bridge_in_chain(encoder, bridge)			\
+	list_for_each_entry(bridge, &(encoder)->bridge_chain, chain_node)
+
 struct drm_bridge *
 drm_bridge_chain_get_next_bridge(struct drm_bridge *bridge);
 bool drm_bridge_chain_mode_fixup(struct drm_bridge *bridge,

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Subject: [PATCH v2 12/21] drm/bridge: Add a drm_bridge_state object
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 Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
 Neil Armstrong <narmstrong@baylibre.com>,
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One of the last remaining objects to not have its atomic state.

This is being motivated by our attempt to support runtime bus-format
negotiation between elements of the bridge chain.
This patch just paves the road for such a feature by adding a new
drm_bridge_state object inheriting from drm_private_obj so we can
re-use some of the existing state initialization/tracking logic.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
Changes in v2:
* Use drm_for_each_bridge_in_chain()
* Rename helpers to be more consistent with the rest of the DRM API
* Improve/fix the doc
---
 drivers/gpu/drm/drm_atomic.c        |  39 +++++++
 drivers/gpu/drm/drm_atomic_helper.c |  20 ++++
 drivers/gpu/drm/drm_bridge.c        | 168 +++++++++++++++++++++++++++-
 include/drm/drm_atomic.h            |   3 +
 include/drm/drm_bridge.h            | 118 +++++++++++++++++++
 5 files changed, 343 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 419381abbdd1..6c249ce39380 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -30,6 +30,7 @@
 
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_uapi.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_debugfs.h>
 #include <drm/drm_device.h>
 #include <drm/drm_drv.h>
@@ -1010,6 +1011,44 @@ static void drm_atomic_connector_print_state(struct drm_printer *p,
 		connector->funcs->atomic_print_state(p, state);
 }
 
+/**
+ * drm_atomic_add_encoder_bridges - add bridges attached to an encoder
+ * @state: atomic state
+ * @encoder: DRM encoder
+ *
+ * This function adds all bridges attached to @encoder. This is needed to add
+ * bridge states to @state and make them available when
+ * &bridge_funcs.atomic_{check,pre_enable,enable,disable_post_disable}() are
+ * called
+ *
+ * Returns:
+ * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
+ * then the w/w mutex code has detected a deadlock and the entire atomic
+ * sequence must be restarted. All other errors are fatal.
+ */
+int
+drm_atomic_add_encoder_bridges(struct drm_atomic_state *state,
+			       struct drm_encoder *encoder)
+{
+	struct drm_bridge_state *bridge_state;
+	struct drm_bridge *bridge;
+
+	if (!encoder)
+		return 0;
+
+	DRM_DEBUG_ATOMIC("Adding all bridges for [encoder:%d:%s] to %p\n",
+			 encoder->base.id, encoder->name, state);
+
+	drm_for_each_bridge_in_chain(encoder, bridge) {
+		bridge_state = drm_atomic_get_bridge_state(state, bridge);
+		if (IS_ERR(bridge_state))
+			return PTR_ERR(bridge_state);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_atomic_add_encoder_bridges);
+
 /**
  * drm_atomic_add_affected_connectors - add connectors for crtc
  * @state: atomic state
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index cccd9e3531c1..b3f59e757b30 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -736,6 +736,26 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
 			return ret;
 	}
 
+	/*
+	 * Iterate over all connectors again, and add all affected bridges to
+	 * the state.
+	 */
+	for_each_oldnew_connector_in_state(state, connector,
+					   old_connector_state,
+					   new_connector_state, i) {
+		struct drm_encoder *encoder;
+
+		encoder = old_connector_state->best_encoder;
+		ret = drm_atomic_add_encoder_bridges(state, encoder);
+		if (ret)
+			return ret;
+
+		encoder = new_connector_state->best_encoder;
+		ret = drm_atomic_add_encoder_bridges(state, encoder);
+		if (ret)
+			return ret;
+	}
+
 	ret = mode_valid(state);
 	if (ret)
 		return ret;
diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index 695ad67d33a5..6c2d7691455b 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -25,6 +25,7 @@
 #include <linux/module.h>
 #include <linux/mutex.h>
 
+#include <drm/drm_atomic_state_helper.h>
 #include <drm/drm_bridge.h>
 #include <drm/drm_encoder.h>
 
@@ -89,6 +90,38 @@ void drm_bridge_remove(struct drm_bridge *bridge)
 }
 EXPORT_SYMBOL(drm_bridge_remove);
 
+static struct drm_private_state *
+drm_bridge_atomic_duplicate_priv_state(struct drm_private_obj *obj)
+{
+	struct drm_bridge *bridge = drm_priv_to_bridge(obj);
+	struct drm_bridge_state *state;
+
+	if (bridge->funcs->atomic_duplicate_state)
+		state = bridge->funcs->atomic_duplicate_state(bridge);
+	else
+		state = drm_atomic_helper_bridge_duplicate_state(bridge);
+
+	return &state->base;
+}
+
+static void
+drm_bridge_atomic_destroy_priv_state(struct drm_private_obj *obj,
+				     struct drm_private_state *s)
+{
+	struct drm_bridge_state *state = drm_priv_to_bridge_state(s);
+	struct drm_bridge *bridge = drm_priv_to_bridge(obj);
+
+	if (bridge->funcs->atomic_destroy_state)
+		bridge->funcs->atomic_destroy_state(bridge, state);
+	else
+		drm_atomic_helper_bridge_destroy_state(bridge, state);
+}
+
+static const struct drm_private_state_funcs drm_bridge_priv_state_funcs = {
+	.atomic_duplicate_state = drm_bridge_atomic_duplicate_priv_state,
+	.atomic_destroy_state = drm_bridge_atomic_destroy_priv_state,
+};
+
 /**
  * drm_bridge_attach - attach the bridge to an encoder's chain
  *
@@ -114,6 +147,7 @@ EXPORT_SYMBOL(drm_bridge_remove);
 int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
 		      struct drm_bridge *previous)
 {
+	struct drm_bridge_state *state;
 	LIST_HEAD(tmp_list);
 	int ret;
 
@@ -132,13 +166,24 @@ int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
 
 	if (bridge->funcs->attach) {
 		ret = bridge->funcs->attach(bridge);
-		if (ret < 0) {
-			bridge->dev = NULL;
-			bridge->encoder = NULL;
-			return ret;
-		}
+		if (ret < 0)
+			goto err_reset_bridge;
 	}
 
+	if (bridge->funcs->atomic_reset)
+		state = bridge->funcs->atomic_reset(bridge);
+	else
+		state = drm_atomic_helper_bridge_reset(bridge);
+
+	if (IS_ERR(state)) {
+		ret = PTR_ERR(state);
+		goto err_detach_bridge;
+	}
+
+	drm_atomic_private_obj_init(bridge->dev, &bridge->base,
+				    &state->base,
+				    &drm_bridge_priv_state_funcs);
+
 	if (bridge == &encoder->bridge)
 		list_splice(&tmp_list, &encoder->bridge_chain);
 	else if (!previous)
@@ -147,6 +192,15 @@ int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
 		list_splice(&tmp_list, &previous->chain_node);
 
 	return 0;
+
+err_detach_bridge:
+	if (bridge->funcs->detach)
+		bridge->funcs->detach(bridge);
+
+err_reset_bridge:
+	bridge->dev = NULL;
+	bridge->encoder = NULL;
+	return ret;
 }
 EXPORT_SYMBOL(drm_bridge_attach);
 
@@ -158,6 +212,8 @@ void drm_bridge_detach(struct drm_bridge *bridge)
 	if (WARN_ON(!bridge->dev))
 		return;
 
+	drm_atomic_private_obj_fini(&bridge->base);
+
 	if (bridge->funcs->detach)
 		bridge->funcs->detach(bridge);
 
@@ -492,6 +548,108 @@ void drm_atomic_bridge_chain_enable(struct drm_bridge *bridge,
 }
 EXPORT_SYMBOL(drm_atomic_bridge_chain_enable);
 
+/**
+ * drm_atomic_helper_bridge_destroy_state() - Default destroy state helper
+ * @bridge: the bridge this state refers to
+ * @state: state object to destroy
+ *
+ * Just a simple kfree() for now.
+ */
+void drm_atomic_helper_bridge_destroy_state(struct drm_bridge *bridge,
+					    struct drm_bridge_state *state)
+{
+	kfree(state);
+}
+EXPORT_SYMBOL(drm_atomic_helper_bridge_destroy_state);
+
+/**
+ * __drm_atomic_helper_bridge_reset() - Initialize a bridge state to its
+ *					default
+ * @bridge: the bridge this state is refers to
+ * @state: bridge state to initialize
+ *
+ * For now it's just a memset(0) plus a state->bridge assignment. Might
+ * be extended in the future.
+ */
+void __drm_atomic_helper_bridge_reset(struct drm_bridge *bridge,
+				      struct drm_bridge_state *state)
+{
+	memset(state, 0, sizeof(*state));
+	state->bridge = bridge;
+}
+EXPORT_SYMBOL(__drm_atomic_helper_bridge_reset);
+
+/**
+ * drm_atomic_helper_bridge_reset() - default &drm_plane_funcs.reset hook for
+ *				      bridges
+ * @bridge: the bridge to reset state on
+ *
+ * Resets the atomic state for @bridge by freeing the state pointer (which
+ * might be NULL, e.g. at driver load time) and allocating a new empty state
+ * object.
+ *
+ * RETURNS:
+ * A valid drm_bridge_state object in case of success, an ERR_PTR()
+ * giving the reaon of the failure otherwise.
+ */
+struct drm_bridge_state *
+drm_atomic_helper_bridge_reset(struct drm_bridge *bridge)
+{
+	struct drm_bridge_state *bridge_state;
+
+	bridge_state = kzalloc(sizeof(*bridge_state), GFP_KERNEL);
+	if (!bridge_state)
+		return ERR_PTR(-ENOMEM);
+
+	__drm_atomic_helper_bridge_reset(bridge, bridge_state);
+	return bridge_state;
+}
+EXPORT_SYMBOL(drm_atomic_helper_bridge_reset);
+
+/**
+ * __drm_atomic_helper_bridge_duplicate_state() - Copy the content of the
+ *						  current bridge state into a
+ *						  new one
+ * @bridge: bridge element the old and new states are referring to
+ * @new: new bridge state to copy to
+ *
+ * Should be used by custom &drm_bridge_funcs.atomic_duplicate() implementation
+ * to copy the previous state into the new object.
+ */
+void __drm_atomic_helper_bridge_duplicate_state(struct drm_bridge *bridge,
+						struct drm_bridge_state *new)
+{
+	__drm_atomic_helper_private_obj_duplicate_state(&bridge->base,
+							&new->base);
+	new->bridge = bridge;
+}
+EXPORT_SYMBOL(__drm_atomic_helper_bridge_duplicate_state);
+
+/**
+ * drm_atomic_helper_duplicate_bridge_state() - Default duplicate state helper
+ * @bridge: bridge containing the state to duplicate
+ *
+ * Default implementation of &drm_bridge_funcs.atomic_duplicate().
+ *
+ * RETURNS:
+ * a valid state object or NULL if the allocation fails.
+ */
+struct drm_bridge_state *
+drm_atomic_helper_bridge_duplicate_state(struct drm_bridge *bridge)
+{
+	struct drm_bridge_state *new;
+
+	if (WARN_ON(!bridge->base.state))
+		return NULL;
+
+	new = kzalloc(sizeof(*new), GFP_KERNEL);
+	if (new)
+		__drm_atomic_helper_bridge_duplicate_state(bridge, new);
+
+	return new;
+}
+EXPORT_SYMBOL(drm_atomic_helper_bridge_duplicate_state);
+
 #ifdef CONFIG_OF
 /**
  * of_drm_find_bridge - find the bridge corresponding to the device node in
diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
index 927e1205d7aa..1c0a08217712 100644
--- a/include/drm/drm_atomic.h
+++ b/include/drm/drm_atomic.h
@@ -660,6 +660,9 @@ __drm_atomic_get_current_plane_state(struct drm_atomic_state *state,
 	return plane->state;
 }
 
+int __must_check
+drm_atomic_add_encoder_bridges(struct drm_atomic_state *state,
+			       struct drm_encoder *encoder);
 int __must_check
 drm_atomic_add_affected_connectors(struct drm_atomic_state *state,
 				   struct drm_crtc *crtc);
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index cf05b30f2967..11b20e2a9fc6 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -25,6 +25,7 @@
 
 #include <linux/list.h>
 #include <linux/ctype.h>
+#include <drm/drm_atomic.h>
 #include <drm/drm_mode_object.h>
 #include <drm/drm_modes.h>
 
@@ -32,6 +33,23 @@ struct drm_bridge;
 struct drm_bridge_timings;
 struct drm_panel;
 
+/**
+ * struct drm_bridge_state - Atomic bridge state object
+ * @base: inherit from &drm_private_state
+ * @bridge: the bridge this state refers to
+ */
+struct drm_bridge_state {
+	struct drm_private_state base;
+
+	struct drm_bridge *bridge;
+};
+
+static inline struct drm_bridge_state *
+drm_priv_to_bridge_state(struct drm_private_state *priv)
+{
+	return container_of(priv, struct drm_bridge_state, base);
+}
+
 /**
  * struct drm_bridge_funcs - drm_bridge control functions
  */
@@ -337,6 +355,48 @@ struct drm_bridge_funcs {
 	 */
 	void (*atomic_post_disable)(struct drm_bridge *bridge,
 				    struct drm_atomic_state *state);
+
+	/**
+	 * @atomic_duplicate_state:
+	 *
+	 * Duplicate the current bridge state object (which is guaranteed to be
+	 * non-NULL).
+	 *
+	 * The atomic_duplicate_state() is optional, the core falls back on
+	 * &drm_atomic_helper_bridge_duplicate_state() when not implemented.
+	 *
+	 * RETURNS:
+	 * A valid drm_bridge_state object or NULL if the allocation fails.
+	 */
+	struct drm_bridge_state *(*atomic_duplicate_state)(struct drm_bridge *bridge);
+
+	/**
+	 * @atomic_destroy_state:
+	 *
+	 * Destroy a bridge state object previously allocated by
+	 * &drm_bridge_funcs.atomic_duplicate_state().
+	 *
+	 * The atomic_destroy_state hook is optional, the coref falls back on
+	 * &drm_atomic_helper_bridge_destroy_state() when not implemented.
+	 */
+	void (*atomic_destroy_state)(struct drm_bridge *bridge,
+				     struct drm_bridge_state *state);
+
+	/**
+	 * @atomic_reset:
+	 *
+	 * Reset the bridge to a predefined state (or retrieve its current
+	 * state) and return a &drm_bridge_state object matching this state.
+	 * This function is called at attach time.
+	 *
+	 * The atomic_reset hook is optional, the core falls back on
+	 * &drm_atomic_helper_bridge_reset() when not implemented.
+	 *
+	 * RETURNS:
+	 * A valid drm_bridge_state object in case of success, an ERR_PTR()
+	 * giving the reaon of the failure otherwise.
+	 */
+	struct drm_bridge_state *(*atomic_reset)(struct drm_bridge *bridge);
 };
 
 /**
@@ -379,6 +439,8 @@ struct drm_bridge_timings {
  * struct drm_bridge - central DRM bridge control structure
  */
 struct drm_bridge {
+	/** @base: inherit from &drm_private_object */
+	struct drm_private_obj base;
 	/** @dev: DRM device this bridge belongs to */
 	struct drm_device *dev;
 	/** @encoder: encoder to which this bridge is connected */
@@ -403,6 +465,12 @@ struct drm_bridge {
 	void *driver_private;
 };
 
+static inline struct drm_bridge *
+drm_priv_to_bridge(struct drm_private_obj *priv)
+{
+	return container_of(priv, struct drm_bridge, base);
+}
+
 void drm_bridge_add(struct drm_bridge *bridge);
 void drm_bridge_remove(struct drm_bridge *bridge);
 struct drm_bridge *of_drm_find_bridge(struct device_node *np);
@@ -445,6 +513,56 @@ void drm_atomic_bridge_chain_pre_enable(struct drm_bridge *bridge,
 void drm_atomic_bridge_chain_enable(struct drm_bridge *bridge,
 				    struct drm_atomic_state *state);
 
+void __drm_atomic_helper_bridge_reset(struct drm_bridge *bridge,
+				      struct drm_bridge_state *state);
+struct drm_bridge_state *
+drm_atomic_helper_bridge_reset(struct drm_bridge *bridge);
+void drm_atomic_helper_bridge_destroy_state(struct drm_bridge *bridge,
+					    struct drm_bridge_state *state);
+void __drm_atomic_helper_bridge_duplicate_state(struct drm_bridge *bridge,
+						struct drm_bridge_state *new);
+struct drm_bridge_state *
+drm_atomic_helper_bridge_duplicate_state(struct drm_bridge *bridge);
+
+static inline struct drm_bridge_state *
+drm_atomic_get_bridge_state(struct drm_atomic_state *state,
+			    struct drm_bridge *bridge)
+{
+	struct drm_private_state *obj_state;
+
+	obj_state = drm_atomic_get_private_obj_state(state, &bridge->base);
+	if (!obj_state)
+		return NULL;
+
+	return drm_priv_to_bridge_state(obj_state);
+}
+
+static inline struct drm_bridge_state *
+drm_atomic_get_old_bridge_state(struct drm_atomic_state *state,
+				struct drm_bridge *bridge)
+{
+	struct drm_private_state *obj_state;
+
+	obj_state = drm_atomic_get_old_private_obj_state(state, &bridge->base);
+	if (!obj_state)
+		return NULL;
+
+	return drm_priv_to_bridge_state(obj_state);
+}
+
+static inline struct drm_bridge_state *
+drm_atomic_get_new_bridge_state(struct drm_atomic_state *state,
+				struct drm_bridge *bridge)
+{
+	struct drm_private_state *obj_state;
+
+	obj_state = drm_atomic_get_new_private_obj_state(state, &bridge->base);
+	if (!obj_state)
+		return NULL;
+
+	return drm_priv_to_bridge_state(obj_state);
+}
+
 #ifdef CONFIG_DRM_PANEL_BRIDGE
 struct drm_bridge *drm_panel_bridge_add(struct drm_panel *panel,
 					u32 connector_type);

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From: Boris Brezillon <boris.brezillon@collabora.com>
To: dri-devel@lists.freedesktop.org
Subject: [PATCH v2 13/21] drm/bridge: Patch atomic hooks to take a
 drm_bridge_state
Date: Mon, 26 Aug 2019 17:26:41 +0200
Message-Id: <20190826152649.13820-14-boris.brezillon@collabora.com>
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Cc: Nikita Yushchenko <nikita.yoush@cogentembedded.com>,
 Jernej Skrabec <jernej.skrabec@siol.net>,
 Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
 Neil Armstrong <narmstrong@baylibre.com>,
 Andrey Smirnov <andrew.smirnov@gmail.com>, Jonas Karlman <jonas@kwiboo.se>,
 Seung-Woo Kim <sw0312.kim@samsung.com>,
 Kyungmin Park <kyungmin.park@samsung.com>,
 Thierry Reding <thierry.reding@gmail.com>,
 Chris Healy <Chris.Healy@zii.aero>,
 Boris Brezillon <boris.brezillon@collabora.com>, kernel@collabora.com,
 Sam Ravnborg <sam@ravnborg.org>
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Instead of a drm_atomic_state. The only driver implementing those hooks
is patched too.

While at it, adjust the documentation and argument names to clarify the
fact that the state being passed to those functions/hooks is the old
state.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
---
Changes in v2:
* Pass the old bridge state
---
 .../drm/bridge/analogix/analogix_dp_core.c    | 12 ++-
 drivers/gpu/drm/drm_bridge.c                  | 73 ++++++++++++++-----
 include/drm/drm_bridge.h                      | 23 ++++--
 3 files changed, 76 insertions(+), 32 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index bb411fe52ae8..e438e757f2ce 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -1290,8 +1290,9 @@ struct drm_crtc *analogix_dp_get_new_crtc(struct analogix_dp_device *dp,
 }
 
 static void analogix_dp_bridge_atomic_pre_enable(struct drm_bridge *bridge,
-						 struct drm_atomic_state *state)
+						 struct drm_bridge_state *bstate)
 {
+	struct drm_atomic_state *state = bstate->base.state;
 	struct analogix_dp_device *dp = bridge->driver_private;
 	struct drm_crtc *crtc;
 	struct drm_crtc_state *old_crtc_state;
@@ -1367,8 +1368,9 @@ static int analogix_dp_set_bridge(struct analogix_dp_device *dp)
 }
 
 static void analogix_dp_bridge_atomic_enable(struct drm_bridge *bridge,
-					     struct drm_atomic_state *state)
+					     struct drm_bridge_state *bstate)
 {
+	struct drm_atomic_state *state = bstate->base.state;
 	struct analogix_dp_device *dp = bridge->driver_private;
 	struct drm_crtc *crtc;
 	struct drm_crtc_state *old_crtc_state;
@@ -1441,8 +1443,9 @@ static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
 }
 
 static void analogix_dp_bridge_atomic_disable(struct drm_bridge *bridge,
-					      struct drm_atomic_state *state)
+					      struct drm_bridge_state *bstate)
 {
+	struct drm_atomic_state *state = bstate->base.state;
 	struct analogix_dp_device *dp = bridge->driver_private;
 	struct drm_crtc *crtc;
 	struct drm_crtc_state *new_crtc_state = NULL;
@@ -1465,8 +1468,9 @@ static void analogix_dp_bridge_atomic_disable(struct drm_bridge *bridge,
 
 static
 void analogix_dp_bridge_atomic_post_disable(struct drm_bridge *bridge,
-					    struct drm_atomic_state *state)
+					    struct drm_bridge_state *bstate)
 {
+	struct drm_atomic_state *state = bstate->base.state;
 	struct analogix_dp_device *dp = bridge->driver_private;
 	struct drm_crtc *crtc;
 	struct drm_crtc_state *new_crtc_state;
diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index 6c2d7691455b..5c83cac7975e 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -437,7 +437,7 @@ EXPORT_SYMBOL(drm_bridge_chain_enable);
 /**
  * drm_atomic_bridge_chain_disable - disables all bridges in the encoder chain
  * @bridge: bridge control structure
- * @state: atomic state being committed
+ * @old_state: old atomic state
  *
  * Calls &drm_bridge_funcs.atomic_disable (falls back on
  * &drm_bridge_funcs.disable) op for all the bridges in the encoder chain,
@@ -447,16 +447,24 @@ EXPORT_SYMBOL(drm_bridge_chain_enable);
  * Note: the bridge passed should be the one closest to the encoder
  */
 void drm_atomic_bridge_chain_disable(struct drm_bridge *bridge,
-				     struct drm_atomic_state *state)
+				     struct drm_atomic_state *old_state)
 {
 	struct drm_encoder *encoder = bridge->encoder;
 	struct drm_bridge *iter;
 
 	list_for_each_entry_reverse(iter, &encoder->bridge_chain, chain_node) {
-		if (iter->funcs->atomic_disable)
-			iter->funcs->atomic_disable(iter, state);
-		else if (iter->funcs->disable)
+		if (iter->funcs->atomic_disable) {
+			struct drm_bridge_state *bridge_state;
+
+			bridge_state = drm_atomic_get_old_bridge_state(old_state,
+								       iter);
+			if (WARN_ON(!bridge_state))
+				return;
+
+			iter->funcs->atomic_disable(iter, bridge_state);
+		} else if (iter->funcs->disable) {
 			iter->funcs->disable(iter);
+		}
 
 		if (iter == bridge)
 			break;
@@ -468,7 +476,7 @@ EXPORT_SYMBOL(drm_atomic_bridge_chain_disable);
  * drm_atomic_bridge_chain_post_disable - cleans up after disabling all bridges
  *					  in the encoder chain
  * @bridge: bridge control structure
- * @state: atomic state being committed
+ * @old_state: old atomic state
  *
  * Calls &drm_bridge_funcs.atomic_post_disable (falls back on
  * &drm_bridge_funcs.post_disable) op for all the bridges in the encoder chain,
@@ -478,15 +486,24 @@ EXPORT_SYMBOL(drm_atomic_bridge_chain_disable);
  * Note: the bridge passed should be the one closest to the encoder
  */
 void drm_atomic_bridge_chain_post_disable(struct drm_bridge *bridge,
-					  struct drm_atomic_state *state)
+					  struct drm_atomic_state *old_state)
 {
 	struct drm_encoder *encoder = bridge->encoder;
 
 	list_for_each_entry_from(bridge, &encoder->bridge_chain, chain_node) {
-		if (bridge->funcs->atomic_post_disable)
-			bridge->funcs->atomic_post_disable(bridge, state);
-		else if (bridge->funcs->post_disable)
+		if (bridge->funcs->atomic_post_disable) {
+			struct drm_bridge_state *bridge_state;
+
+			bridge_state = drm_atomic_get_old_bridge_state(old_state,
+								       bridge);
+			if (WARN_ON(!bridge_state))
+				return;
+
+			bridge->funcs->atomic_post_disable(bridge,
+							   bridge_state);
+		} else if (bridge->funcs->post_disable) {
 			bridge->funcs->post_disable(bridge);
+		}
 	}
 }
 EXPORT_SYMBOL(drm_atomic_bridge_chain_post_disable);
@@ -495,7 +512,7 @@ EXPORT_SYMBOL(drm_atomic_bridge_chain_post_disable);
  * drm_atomic_bridge_chain_pre_enable - prepares for enabling all bridges in
  *					the encoder chain
  * @bridge: bridge control structure
- * @state: atomic state being committed
+ * @old_state: old atomic state
  *
  * Calls &drm_bridge_funcs.atomic_pre_enable (falls back on
  * &drm_bridge_funcs.pre_enable) op for all the bridges in the encoder chain,
@@ -505,16 +522,24 @@ EXPORT_SYMBOL(drm_atomic_bridge_chain_post_disable);
  * Note: the bridge passed should be the one closest to the encoder
  */
 void drm_atomic_bridge_chain_pre_enable(struct drm_bridge *bridge,
-					struct drm_atomic_state *state)
+					struct drm_atomic_state *old_state)
 {
 	struct drm_encoder *encoder = bridge->encoder;
 	struct drm_bridge *iter;
 
 	list_for_each_entry_reverse(iter, &encoder->bridge_chain, chain_node) {
-		if (iter->funcs->atomic_pre_enable)
-			iter->funcs->atomic_pre_enable(iter, state);
-		else if (iter->funcs->pre_enable)
+		if (iter->funcs->atomic_pre_enable) {
+			struct drm_bridge_state *bridge_state;
+
+			bridge_state = drm_atomic_get_old_bridge_state(old_state,
+								       iter);
+			if (WARN_ON(!bridge_state))
+				return;
+
+			iter->funcs->atomic_pre_enable(iter, bridge_state);
+		} else if (iter->funcs->pre_enable) {
 			iter->funcs->pre_enable(iter);
+		}
 
 		if (iter == bridge)
 			break;
@@ -525,7 +550,7 @@ EXPORT_SYMBOL(drm_atomic_bridge_chain_pre_enable);
 /**
  * drm_atomic_bridge_chain_enable - enables all bridges in the encoder chain
  * @bridge: bridge control structure
- * @state: atomic state being committed
+ * @old_state: old atomic state
  *
  * Calls &drm_bridge_funcs.atomic_enable (falls back on
  * &drm_bridge_funcs.enable) op for all the bridges in the encoder chain,
@@ -535,15 +560,23 @@ EXPORT_SYMBOL(drm_atomic_bridge_chain_pre_enable);
  * Note: the bridge passed should be the one closest to the encoder
  */
 void drm_atomic_bridge_chain_enable(struct drm_bridge *bridge,
-				    struct drm_atomic_state *state)
+				    struct drm_atomic_state *old_state)
 {
 	struct drm_encoder *encoder = bridge->encoder;
 
 	list_for_each_entry_from(bridge, &encoder->bridge_chain, chain_node) {
-		if (bridge->funcs->atomic_enable)
-			bridge->funcs->atomic_enable(bridge, state);
-		else if (bridge->funcs->enable)
+		if (bridge->funcs->atomic_enable) {
+			struct drm_bridge_state *bridge_state;
+
+			bridge_state = drm_atomic_get_old_bridge_state(old_state,
+								       bridge);
+			if (WARN_ON(!bridge_state))
+				return;
+
+			bridge->funcs->atomic_enable(bridge, bridge_state);
+		} else if (bridge->funcs->enable) {
 			bridge->funcs->enable(bridge);
+		}
 	}
 }
 EXPORT_SYMBOL(drm_atomic_bridge_chain_enable);
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 11b20e2a9fc6..231f62cd681d 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -264,7 +264,8 @@ struct drm_bridge_funcs {
 	 * preceding element is a bridge this means it's called before that
 	 * bridge's @atomic_pre_enable or @pre_enable function. If the preceding
 	 * element is a &drm_encoder it's called right before the encoder's
-	 * &drm_encoder_helper_funcs.atomic_enable hook.
+	 * &drm_encoder_helper_funcs.atomic_enable hook. This hook is passed the
+	 * old bridge state (the new one can be retrieved from bridge->state).
 	 *
 	 * The display pipe (i.e. clocks and timing signals) feeding this bridge
 	 * will not yet be running when this callback is called. The bridge must
@@ -280,7 +281,7 @@ struct drm_bridge_funcs {
 	 * The @atomic_pre_enable callback is optional.
 	 */
 	void (*atomic_pre_enable)(struct drm_bridge *bridge,
-				  struct drm_atomic_state *state);
+				  struct drm_bridge_state *old_bridge_state);
 
 	/**
 	 * @atomic_enable:
@@ -290,7 +291,9 @@ struct drm_bridge_funcs {
 	 * preceding element is a bridge this means it's called after that
 	 * bridge's @atomic_enable or @enable function. If the preceding element
 	 * is a &drm_encoder it's called right after the encoder's
-	 * &drm_encoder_helper_funcs.atomic_enable hook.
+	 * &drm_encoder_helper_funcs.atomic_enable hook. This hook is passed
+	 * the old bridge state (the new one can be retrieved from
+	 * bridge->state).
 	 *
 	 * The bridge can assume that the display pipe (i.e. clocks and timing
 	 * signals) feeding it is running when this callback is called. This
@@ -305,7 +308,7 @@ struct drm_bridge_funcs {
 	 * The enable callback is optional.
 	 */
 	void (*atomic_enable)(struct drm_bridge *bridge,
-			      struct drm_atomic_state *state);
+			      struct drm_bridge_state *old_bridge_state);
 	/**
 	 * @atomic_disable:
 	 *
@@ -314,7 +317,9 @@ struct drm_bridge_funcs {
 	 * preceding element is a bridge this means it's called before that
 	 * bridge's @atomic_disable or @disable vfunc. If the preceding element
 	 * is a &drm_encoder it's called right before the
-	 * &drm_encoder_helper_funcs.atomic_disable hook.
+	 * &drm_encoder_helper_funcs.atomic_disable hook. This hook is passed
+	 * the old bridge state (the new one can be retrieved from
+	 * bridge->state).
 	 *
 	 * The bridge can assume that the display pipe (i.e. clocks and timing
 	 * signals) feeding it is still running when this callback is called.
@@ -328,7 +333,7 @@ struct drm_bridge_funcs {
 	 * The disable callback is optional.
 	 */
 	void (*atomic_disable)(struct drm_bridge *bridge,
-			       struct drm_atomic_state *state);
+			       struct drm_bridge_state *old_bridge_state);
 
 	/**
 	 * @atomic_post_disable:
@@ -338,7 +343,9 @@ struct drm_bridge_funcs {
 	 * element is a bridge this means it's called after that bridge's
 	 * @atomic_post_disable or @post_disable function. If the preceding
 	 * element is a &drm_encoder it's called right after the encoder's
-	 * &drm_encoder_helper_funcs.atomic_disable hook.
+	 * &drm_encoder_helper_funcs.atomic_disable hook. This hook is passed
+	 * the old bridge state (the new one can be retrieved from
+	 * bridge->state).
 	 *
 	 * The bridge must assume that the display pipe (i.e. clocks and timing
 	 * signals) feeding it is no longer running when this callback is
@@ -354,7 +361,7 @@ struct drm_bridge_funcs {
 	 * The post_disable callback is optional.
 	 */
 	void (*atomic_post_disable)(struct drm_bridge *bridge,
-				    struct drm_atomic_state *state);
+				    struct drm_bridge_state *old_bridge_state);
 
 	/**
 	 * @atomic_duplicate_state:

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From: Boris Brezillon <boris.brezillon@collabora.com>
To: dri-devel@lists.freedesktop.org
Subject: [PATCH v2 14/21] drm/bridge: Add an ->atomic_check() hook
Date: Mon, 26 Aug 2019 17:26:42 +0200
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So that bridge drivers have a way to check/reject an atomic operation.
The drm_atomic_bridge_chain_check() (which is just a wrapper around
the ->atomic_check() hook) is called in place of
drm_bridge_chain_mode_fixup() (when ->atomic_check() is not implemented,
the core falls back to ->mode_fixup(), so the behavior should stay
the same for existing bridge drivers).

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
Laurent,

I haven't clarified what's allowed to be changed in
->mode_fixup()/->atomic_check() simply because I don't know what the
constraints are. Since the problem already exists with the
->mode_fixup() hook, and given the goal of this series is to support
bus_format negotation (which does not involve tweaking the display
mode), I'd prefer to delay these semantic adjustments if you're okay
with that.

Regards,

Boris

Changes in v2:
* Clarify the fact that ->atomic_check() is replacing ->mode_fixup()
---
 drivers/gpu/drm/drm_atomic_helper.c | 12 +++---
 drivers/gpu/drm/drm_bridge.c        | 62 +++++++++++++++++++++++++++++
 include/drm/drm_bridge.h            | 29 +++++++++++++-
 3 files changed, 96 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index b3f59e757b30..2a4ac69ccc93 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -445,12 +445,12 @@ mode_fixup(struct drm_atomic_state *state)
 		encoder = new_conn_state->best_encoder;
 		funcs = encoder->helper_private;
 
-		ret = drm_bridge_chain_mode_fixup(&encoder->bridge,
-					&new_crtc_state->mode,
-					&new_crtc_state->adjusted_mode);
-		if (!ret) {
-			DRM_DEBUG_ATOMIC("Bridge fixup failed\n");
-			return -EINVAL;
+		ret = drm_atomic_bridge_chain_check(&encoder->bridge,
+						    new_crtc_state,
+						    new_conn_state);
+		if (ret) {
+			DRM_DEBUG_ATOMIC("Bridge atomic check failed\n");
+			return ret;
 		}
 
 		if (funcs && funcs->atomic_check) {
diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index 5c83cac7975e..7f7e0ea5b06c 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -581,6 +581,68 @@ void drm_atomic_bridge_chain_enable(struct drm_bridge *bridge,
 }
 EXPORT_SYMBOL(drm_atomic_bridge_chain_enable);
 
+static int drm_atomic_bridge_check(struct drm_bridge *bridge,
+				   struct drm_crtc_state *crtc_state,
+				   struct drm_connector_state *conn_state)
+{
+	if (bridge->funcs->atomic_check) {
+		struct drm_bridge_state *bridge_state;
+		int ret;
+
+		bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state,
+							       bridge);
+		if (WARN_ON(!bridge_state))
+			return -EINVAL;
+
+		ret = bridge->funcs->atomic_check(bridge, bridge_state,
+						  crtc_state, conn_state);
+		if (ret)
+			return ret;
+	} else if (bridge->funcs->mode_fixup) {
+		if (!bridge->funcs->mode_fixup(bridge, &crtc_state->mode,
+					       &crtc_state->adjusted_mode))
+			return -EINVAL;
+	}
+
+	return 0;
+}
+
+/**
+ * drm_atomic_bridge_chain_check() - Do an atomic check on the bridge chain
+ * @bridge: bridge control structure
+ * @crtc_state: new CRTC state
+ * @conn_state: new connector state
+ *
+ * Calls &drm_bridge_funcs.atomic_check() (falls back on
+ * &drm_bridge_funcs.mode_fixup()) op for all the bridges in the encoder chain,
+ * starting from the last bridge to the first. These are called before calling
+ * &drm_encoder_helper_funcs.atomic_check()
+ *
+ * RETURNS:
+ * 0 on success, a negative error code on failure
+ */
+int drm_atomic_bridge_chain_check(struct drm_bridge *bridge,
+				  struct drm_crtc_state *crtc_state,
+				  struct drm_connector_state *conn_state)
+{
+	struct drm_encoder *encoder = bridge->encoder;
+	struct drm_bridge *iter;
+
+	list_for_each_entry_reverse(iter, &encoder->bridge_chain, chain_node) {
+		int ret;
+
+		ret = drm_atomic_bridge_check(iter, crtc_state, conn_state);
+		if (ret)
+			return ret;
+
+		if (iter == bridge)
+			break;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_atomic_bridge_chain_check);
+
 /**
  * drm_atomic_helper_bridge_destroy_state() - Default destroy state helper
  * @bridge: the bridge this state refers to
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 231f62cd681d..7fdce6dc5f26 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -126,7 +126,9 @@ struct drm_bridge_funcs {
 	 * this function passes all other callbacks must succeed for this
 	 * configuration.
 	 *
-	 * The mode_fixup callback is optional.
+	 * The mode_fixup callback is optional. &drm_bridge_funcs.mode_fixup()
+	 * is not called when &drm_bridge_funcs.atomic_check() is implemented,
+	 * so only one of them should be provided.
 	 *
 	 * NOTE:
 	 *
@@ -389,6 +391,28 @@ struct drm_bridge_funcs {
 	void (*atomic_destroy_state)(struct drm_bridge *bridge,
 				     struct drm_bridge_state *state);
 
+	/**
+	 * @atomic_check:
+	 *
+	 * This method is responsible for checking bridge state correctness.
+	 * It can also check the state of the surrounding components in chain
+	 * to make sure the whole pipeline can work properly.
+	 *
+	 * &drm_bridge_funcs.atomic_check() hooks are called in reverse
+	 * order (from the last to the first bridge).
+	 *
+	 * This method is optional. &drm_bridge_funcs.mode_fixup() is not
+	 * called when &drm_bridge_funcs.atomic_check() is implemented, so only
+	 * one of them should be provided.
+	 *
+	 * RETURNS:
+	 * zero if the check passed, a negative error code otherwise.
+	 */
+	int (*atomic_check)(struct drm_bridge *bridge,
+			    struct drm_bridge_state *bridge_state,
+			    struct drm_crtc_state *crtc_state,
+			    struct drm_connector_state *conn_state);
+
 	/**
 	 * @atomic_reset:
 	 *
@@ -511,6 +535,9 @@ void drm_bridge_chain_mode_set(struct drm_bridge *bridge,
 void drm_bridge_chain_pre_enable(struct drm_bridge *bridge);
 void drm_bridge_chain_enable(struct drm_bridge *bridge);
 
+int drm_atomic_bridge_chain_check(struct drm_bridge *bridge,
+				  struct drm_crtc_state *crtc_state,
+				  struct drm_connector_state *conn_state);
 void drm_atomic_bridge_chain_disable(struct drm_bridge *bridge,
 				     struct drm_atomic_state *state);
 void drm_atomic_bridge_chain_post_disable(struct drm_bridge *bridge,

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From: Boris Brezillon <boris.brezillon@collabora.com>
To: dri-devel@lists.freedesktop.org
Subject: [PATCH v2 15/21] drm/bridge: Add the
 drm_bridge_chain_get_prev_bridge() helper
Date: Mon, 26 Aug 2019 17:26:43 +0200
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Will be useful for bridge drivers that want to do bus format
negotiation with their neighbours.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
---
Changes in v2:
* Fix the kerneldoc
* Drop the !bridge || !bridge->encoder check
---
 drivers/gpu/drm/drm_bridge.c | 17 +++++++++++++++++
 include/drm/drm_bridge.h     |  2 ++
 2 files changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index 7f7e0ea5b06c..9c74b285da9d 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -238,6 +238,23 @@ drm_bridge_chain_get_next_bridge(struct drm_bridge *bridge)
 }
 EXPORT_SYMBOL(drm_bridge_chain_get_next_bridge);
 
+/**
+ * drm_bridge_chain_get_prev_bridge() - Get the previous bridge in the chain
+ * @bridge: bridge object
+ *
+ * RETURNS:
+ * the previous bridge in the chain, or NULL if @bridge is the last.
+ */
+struct drm_bridge *
+drm_bridge_chain_get_prev_bridge(struct drm_bridge *bridge)
+{
+	if (list_is_first(&bridge->chain_node, &bridge->encoder->bridge_chain))
+		return NULL;
+
+	return list_prev_entry(bridge, chain_node);
+}
+EXPORT_SYMBOL(drm_bridge_chain_get_prev_bridge);
+
 /**
  * DOC: bridge callbacks
  *
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 7fdce6dc5f26..95dc58c3a4e8 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -521,6 +521,8 @@ int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
 
 struct drm_bridge *
 drm_bridge_chain_get_next_bridge(struct drm_bridge *bridge);
+struct drm_bridge *
+drm_bridge_chain_get_prev_bridge(struct drm_bridge *bridge);
 bool drm_bridge_chain_mode_fixup(struct drm_bridge *bridge,
 				 const struct drm_display_mode *mode,
 				 struct drm_display_mode *adjusted_mode);

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Subject: [PATCH v2 16/21] drm/bridge: Add the necessary bits to support bus
 format negotiation
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This takes the form of various helpers, plus the addition of 2 new
structs:
* drm_bus_caps: describe the bus capabilities of a bridge/encoder. For
  bridges we have one for the input port and one for the output port.
  Encoders just have one output port.
* drm_bus_cfg: added to the drm_bridge_state. It's supposed to store
  bus configuration information. For now we just have format and flags
  but more fields might be added in the future. Again, each
  drm_bridge_state contains 2 drm_bus_cfg elements: one for the output
  port and one for the input port

Helpers can be used from bridge drivers' ->atomic_check() implementation
to negotiate the bus format to use. Negotiation happens in reserve order,
starting from the last element of the bridge chain (the one directly
connected to the display) to the first element of the chain (the one
connected to the encoder).

Negotiation usually takes place in 2 steps:
* make sure the input end of the next element in the chain picked a
  format that's supported by the output end of our bridge. That's done
  with drm_atomic_bridge_choose_output_bus_cfg().
* choose a format for the input end of our bridge based on what's
  supported by the previous bridge in the chain. This is achieved by
  calling drm_atomic_bridge_choose_input_bus_cfg()

Note that those helpers are a bit lax when it comes to uninitialized
bus format validation. That's intentional. If we don't do that we'll
basically break things if we start adding support for bus format
negotiation to some elements of the pipeline leaving others on the
side, and that's likely to happen for all external bridges since we
can't necessarily tell where they are used.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Tested-by: Neil Armstrong <narmstrong@baylibre.com>
---
Changes in v2:
* Rework things to support more complex use cases
---
 drivers/gpu/drm/drm_bridge.c | 179 ++++++++++++++++++++++++++++++++++-
 include/drm/drm_bridge.h     |  82 ++++++++++++++++
 2 files changed, 260 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index 9c74b285da9d..b53732ac997d 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -624,13 +624,184 @@ static int drm_atomic_bridge_check(struct drm_bridge *bridge,
 	return 0;
 }
 
+static int select_bus_fmt_recursive(struct drm_bridge *first,
+				    struct drm_bridge *cur,
+				    struct drm_crtc_state *crtc_state,
+				    struct drm_connector_state *conn_state,
+				    u32 out_bus_fmt)
+{
+	struct drm_bridge_state *cur_state;
+	unsigned int num_in_bus_fmts, i;
+	struct drm_bridge *prev;
+	u32 *in_bus_fmts;
+	int ret;
+
+	prev = drm_bridge_chain_get_prev_bridge(cur);
+	cur_state = drm_atomic_get_new_bridge_state(crtc_state->state, cur);
+	if (WARN_ON(!cur_state))
+		return -EINVAL;
+
+	/*
+	 * Bus format negotiation is not supported by this bridge, let's pass
+	 * MEDIA_BUS_FMT_FIXED to the previous bridge in the chain and hope
+	 * that it can handle this situation gracefully (by providing
+	 * appropriate default values).
+	 */
+	if (!cur->funcs->atomic_get_input_bus_fmts) {
+		if (cur != first) {
+			ret = select_bus_fmt_recursive(first, prev, crtc_state,
+						       conn_state,
+						       MEDIA_BUS_FMT_FIXED);
+			if (ret)
+				return ret;
+		}
+
+		cur_state->input_bus_cfg.fmt = MEDIA_BUS_FMT_FIXED;
+		cur_state->output_bus_cfg.fmt = out_bus_fmt;
+		return 0;
+	}
+
+	cur->funcs->atomic_get_input_bus_fmts(cur, cur_state, crtc_state,
+					      conn_state, out_bus_fmt,
+					      &num_in_bus_fmts, NULL);
+	if (!num_in_bus_fmts)
+		return -ENOTSUPP;
+
+	in_bus_fmts = kcalloc(num_in_bus_fmts, sizeof(*in_bus_fmts),
+			      GFP_KERNEL);
+	if (!in_bus_fmts)
+		return -ENOMEM;
+
+	cur->funcs->atomic_get_input_bus_fmts(cur, cur_state, crtc_state,
+					      conn_state, out_bus_fmt,
+					      &num_in_bus_fmts, in_bus_fmts);
+
+	if (first == cur) {
+		cur_state->input_bus_cfg.fmt = in_bus_fmts[0];
+		cur_state->output_bus_cfg.fmt = out_bus_fmt;
+		kfree(in_bus_fmts);
+		return 0;
+	}
+
+	for (i = 0; i < num_in_bus_fmts; i++) {
+		ret = select_bus_fmt_recursive(first, prev, crtc_state,
+					       conn_state, in_bus_fmts[i]);
+		if (ret != -ENOTSUPP)
+			break;
+	}
+
+	if (!ret) {
+		cur_state->input_bus_cfg.fmt = in_bus_fmts[i];
+		cur_state->output_bus_cfg.fmt = out_bus_fmt;
+	}
+
+	kfree(in_bus_fmts);
+	return ret;
+}
+
+/*
+ * This function is called by &drm_atomic_bridge_chain_check() just before
+ * calling &drm_bridge_funcs.atomic_check() on all elements of the chain.
+ * It's providing bus format negotiation between bridge elements. The
+ * negotiation happens in reverse order, starting from the last element in
+ * the chain up to @bridge.
+ *
+ * Negotiation starts by retrieving supported output bus formats on the last
+ * bridge element and testing them one by one. The test is recursive, meaning
+ * that for each tested output format, the whole chain will be walked backward,
+ * and each element will have to choose an input bus format that can be
+ * transcoded to the requested output format. When a bridge element does not
+ * support transcoding into a specific output format -ENOTSUPP is returned and
+ * the next bridge element will have to try a different format. If none of the
+ * combinations worked, -ENOTSUPP is returned and the atomic modeset will fail.
+ *
+ * This implementation is relying on
+ * &drm_bridge_funcs.atomic_get_output_bus_fmts() and
+ * &drm_bridge_funcs.atomic_get_input_bus_fmts() to gather supported
+ * input/output formats.
+ * When &drm_bridge_funcs.atomic_get_output_bus_fmts() is not implemented by
+ * the last element of the chain, &drm_atomic_bridge_chain_select_bus_fmts()
+ * tries a single format: &drm_connector.display_info.bus_formats[0] if
+ * available, MEDIA_BUS_FMT_FIXED otherwise.
+ * When &drm_bridge_funcs.atomic_get_input_bus_fmts() is not implemented,
+ * &drm_atomic_bridge_chain_select_bus_fmts() skips the negotiation on the
+ * bridge element that lacks this hook and asks the previous element in the
+ * chain to try MEDIA_BUS_FMT_FIXED. It's up to bridge drivers to decide what
+ * to do in that case (fail if they want to enforce bus format negotiation, or
+ * provide a reasonable default if they need to support pipelines where not
+ * all elements support bus format negotiation).
+ */
+static int
+drm_atomic_bridge_chain_select_bus_fmts(struct drm_bridge *bridge,
+					struct drm_crtc_state *crtc_state,
+					struct drm_connector_state *conn_state)
+{
+	struct drm_connector *conn = conn_state->connector;
+	struct drm_encoder *encoder = bridge->encoder;
+	struct drm_bridge_state *last_bridge_state;
+	unsigned int i, num_out_bus_fmts;
+	struct drm_bridge *last_bridge;
+	u32 *out_bus_fmts;
+	int ret = 0;
+
+	last_bridge = list_last_entry(&encoder->bridge_chain,
+				      struct drm_bridge, chain_node);
+	last_bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state,
+							    last_bridge);
+	if (WARN_ON(!last_bridge_state))
+		return -EINVAL;
+
+	if (last_bridge->funcs->atomic_get_output_bus_fmts)
+		last_bridge->funcs->atomic_get_output_bus_fmts(last_bridge,
+							last_bridge_state,
+							crtc_state,
+							conn_state,
+							&num_out_bus_fmts,
+							NULL);
+	else
+		num_out_bus_fmts = 1;
+
+	if (!num_out_bus_fmts)
+		return -ENOTSUPP;
+
+	out_bus_fmts = kcalloc(num_out_bus_fmts, sizeof(*out_bus_fmts),
+			       GFP_KERNEL);
+	if (!out_bus_fmts)
+		return -ENOMEM;
+
+	if (last_bridge->funcs->atomic_get_output_bus_fmts)
+		last_bridge->funcs->atomic_get_output_bus_fmts(last_bridge,
+							last_bridge_state,
+							crtc_state,
+							conn_state,
+							&num_out_bus_fmts,
+							out_bus_fmts);
+	else if (conn->display_info.num_bus_formats &&
+		 conn->display_info.bus_formats)
+		out_bus_fmts[0] = conn->display_info.bus_formats[0];
+	else
+		out_bus_fmts[0] = MEDIA_BUS_FMT_FIXED;
+
+	for (i = 0; i < num_out_bus_fmts; i++) {
+		ret = select_bus_fmt_recursive(bridge, last_bridge, crtc_state,
+					       conn_state, out_bus_fmts[i]);
+		if (ret != -ENOTSUPP)
+			break;
+	}
+
+	kfree(out_bus_fmts);
+
+	return ret;
+}
+
 /**
  * drm_atomic_bridge_chain_check() - Do an atomic check on the bridge chain
  * @bridge: bridge control structure
  * @crtc_state: new CRTC state
  * @conn_state: new connector state
  *
- * Calls &drm_bridge_funcs.atomic_check() (falls back on
+ * First trigger a bus format negotiation before calling
+ * &drm_bridge_funcs.atomic_check() (falls back on
  * &drm_bridge_funcs.mode_fixup()) op for all the bridges in the encoder chain,
  * starting from the last bridge to the first. These are called before calling
  * &drm_encoder_helper_funcs.atomic_check()
@@ -644,6 +815,12 @@ int drm_atomic_bridge_chain_check(struct drm_bridge *bridge,
 {
 	struct drm_encoder *encoder = bridge->encoder;
 	struct drm_bridge *iter;
+	int ret;
+
+	ret = drm_atomic_bridge_chain_select_bus_fmts(bridge, crtc_state,
+						      conn_state);
+	if (ret)
+		return ret;
 
 	list_for_each_entry_reverse(iter, &encoder->bridge_chain, chain_node) {
 		int ret;
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 95dc58c3a4e8..96df3bedfee4 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -33,15 +33,33 @@ struct drm_bridge;
 struct drm_bridge_timings;
 struct drm_panel;
 
+/**
+ * struct drm_bus_cfg - bus configuration
+ * @fmt: format used on this bus
+ * @flags: DRM_BUS_ flags used on this bus
+ *
+ * Encodes the bus format and bus flags used by one end of the bridge or
+ * by the encoder output.
+ */
+struct drm_bus_cfg {
+	u32 fmt;
+	u32 flags;
+};
+
 /**
  * struct drm_bridge_state - Atomic bridge state object
  * @base: inherit from &drm_private_state
  * @bridge: the bridge this state refers to
+ * @input_bus_info: input bus information
+ * @output_bus_info: output bus information
  */
 struct drm_bridge_state {
 	struct drm_private_state base;
 
 	struct drm_bridge *bridge;
+
+	struct drm_bus_cfg input_bus_cfg;
+	struct drm_bus_cfg output_bus_cfg;
 };
 
 static inline struct drm_bridge_state *
@@ -391,6 +409,70 @@ struct drm_bridge_funcs {
 	void (*atomic_destroy_state)(struct drm_bridge *bridge,
 				     struct drm_bridge_state *state);
 
+	/**
+	 * @atomic_get_output_bus_fmts:
+	 *
+	 * Return the supported bus formats on the output end of a bridge.
+	 * This method is called twice. Once with output_fmts set NULL, in this
+	 * case the driver should set num_output_fmts to the number of
+	 * supported output bus formats such that the core can allocate an
+	 * array of the right dimension. The second time it's called with a
+	 * non-NULL output_fmts, and the driver is expected to fill the
+	 * output_fmts array. The output_fmts array passed to the driver is
+	 * guaranteed to be big enough to store the number of entries returned
+	 * on the first call (no need to check num_output_fmts).
+	 *
+	 * This method is only called on the last element of the bridge chain
+	 * as part of the bus format negotiation process that happens in
+	 * &drm_atomic_bridge_chain_select_bus_fmts().
+	 * This method is optional. When not implemented, the core will
+	 * fallback to &drm_connector.display_info.bus_formats[0] if
+	 * &drm_connector.display_info.num_bus_formats > 0,
+	 * MEDIA_BUS_FMT_FIXED otherwise.
+	 */
+	void (*atomic_get_output_bus_fmts)(struct drm_bridge *bridge,
+					   struct drm_bridge_state *bridge_state,
+					   struct drm_crtc_state *crtc_state,
+					   struct drm_connector_state *conn_state,
+					   unsigned int *num_output_fmts,
+					   u32 *output_fmts);
+
+	/**
+	 * @atomic_get_input_bus_fmts:
+	 *
+	 * Return the supported bus formats on the input end of a bridge for
+	 * a specific output bus format.
+	 * This method is called twice. Once with input_fmts set NULL, in this
+	 * case the driver should set num_input_fmts to the number of
+	 * supported input bus formats such that the core can allocate an array
+	 * of the right dimension. The second time it's called with a non-NULL
+	 * input_fmts, and the driver is expected to fill the input_fmts array.
+	 * The input_fmts array passed to the driver is guaranteed to be big
+	 * enough to store the number of entries returned on the first call (no
+	 * need to check num_input_fmts).
+	 *
+	 * This method is called on all element of the bridge chain as part of
+	 * the bus format negotiation process that happens in
+	 * &drm_atomic_bridge_chain_select_bus_fmts().
+	 * This method is optional. When not implemented, the core will bypass
+	 * bus format negotiation on this element of the bridge without
+	 * failing, and the previous element in the chain will be passed
+	 * MEDIA_BUS_FMT_FIXED as its output bus format.
+	 *
+	 * Bridge drivers that need to support being linked to bridges that are
+	 * not supporting bus format negotiation should handle the
+	 * output_fmt == MEDIA_BUS_FMT_FIXED case appropriately, by selecting a
+	 * sensible default value or extracting this information from somewhere
+	 * else (FW property, &drm_display_mode, &drm_display_info, ...)
+	 */
+	void (*atomic_get_input_bus_fmts)(struct drm_bridge *bridge,
+					  struct drm_bridge_state *bridge_state,
+					  struct drm_crtc_state *crtc_state,
+					  struct drm_connector_state *conn_state,
+					  u32 output_fmt,
+					  unsigned int *num_input_fmts,
+					  u32 *input_fmts);
+
 	/**
 	 * @atomic_check:
 	 *

From patchwork Mon Aug 26 15:26:45 2019
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From: Boris Brezillon <boris.brezillon@collabora.com>
To: dri-devel@lists.freedesktop.org
Subject: [PATCH v2 17/21] drm/imx: pd: Use bus format/flags provided by the
 bridge when available
Date: Mon, 26 Aug 2019 17:26:45 +0200
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Cc: Nikita Yushchenko <nikita.yoush@cogentembedded.com>,
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Now that bridges can expose the bus format/flags they expect, we can
use those instead of the relying on the display_info provided by the
connector (which is only valid if the encoder is directly connected
to bridge element driving the panel/display).

We also explicitly expose the bus formats supported by our encoder by
filling encoder->output_bus_caps with proper info.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
Changes in v2:
* Adjust things to match the new bus-format negotiation infra
---
 drivers/gpu/drm/imx/parallel-display.c | 136 ++++++++++++++++++++++---
 1 file changed, 120 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/imx/parallel-display.c b/drivers/gpu/drm/imx/parallel-display.c
index 35518e5de356..df47cb74759f 100644
--- a/drivers/gpu/drm/imx/parallel-display.c
+++ b/drivers/gpu/drm/imx/parallel-display.c
@@ -89,37 +89,139 @@ static struct drm_encoder *imx_pd_connector_best_encoder(
 	return &imxpd->encoder;
 }
 
-static void imx_pd_encoder_enable(struct drm_encoder *encoder)
+static void imx_pd_bridge_enable(struct drm_bridge *bridge)
 {
+	struct drm_encoder *encoder = bridge_to_encoder(bridge);
 	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 
 	drm_panel_prepare(imxpd->panel);
 	drm_panel_enable(imxpd->panel);
 }
 
-static void imx_pd_encoder_disable(struct drm_encoder *encoder)
+static void imx_pd_bridge_disable(struct drm_bridge *bridge)
 {
+	struct drm_encoder *encoder = bridge_to_encoder(bridge);
 	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 
 	drm_panel_disable(imxpd->panel);
 	drm_panel_unprepare(imxpd->panel);
 }
 
-static int imx_pd_encoder_atomic_check(struct drm_encoder *encoder,
-				       struct drm_crtc_state *crtc_state,
-				       struct drm_connector_state *conn_state)
+static const u32 imx_pd_bus_fmts[] = {
+	MEDIA_BUS_FMT_RGB888_1X24,
+	MEDIA_BUS_FMT_RGB565_1X16,
+	MEDIA_BUS_FMT_RGB666_1X18,
+	MEDIA_BUS_FMT_RGB666_1X24_CPADHI,
+};
+
+static void
+imx_pd_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
+					 struct drm_bridge_state *bridge_state,
+					 struct drm_crtc_state *crtc_state,
+					 struct drm_connector_state *conn_state,
+					 unsigned int *num_output_fmts,
+					 u32 *output_fmts)
 {
+	struct drm_display_info *di = &conn_state->connector->display_info;
+	struct drm_encoder *encoder = bridge_to_encoder(bridge);
+	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
+
+	*num_output_fmts = 1;
+	if (imxpd->bus_format) {
+		if (output_fmts)
+			output_fmts[0] = imxpd->bus_format;
+	} else if (di->num_bus_formats) {
+		*num_output_fmts = 1;
+		if (output_fmts)
+			output_fmts[0] = di->bus_formats[0];
+	} else {
+		*num_output_fmts = ARRAY_SIZE(imx_pd_bus_fmts);
+		if (output_fmts)
+			memcpy(output_fmts, imx_pd_bus_fmts,
+			       ARRAY_SIZE(imx_pd_bus_fmts));
+	}
+}
+
+static void
+imx_pd_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
+					struct drm_bridge_state *bridge_state,
+					struct drm_crtc_state *crtc_state,
+					struct drm_connector_state *conn_state,
+					u32 output_fmt,
+					unsigned int *num_input_fmts,
+					u32 *input_fmts)
+{
+	struct drm_encoder *encoder = bridge_to_encoder(bridge);
+	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
+
+	*num_input_fmts = 0;
+	if (output_fmt == MEDIA_BUS_FMT_FIXED) {
+		*num_input_fmts = 1;
+	} else if (!imxpd->bus_format) {
+		unsigned int i;
+
+		for (i = 0; i < ARRAY_SIZE(imx_pd_bus_fmts); i++) {
+			if (imx_pd_bus_fmts[i] == output_fmt) {
+				*num_input_fmts = 1;
+				break;
+			}
+		}
+	} else if (imxpd->bus_format == output_fmt) {
+		*num_input_fmts = 1;
+	}
+
+	if (*num_input_fmts && input_fmts)
+		input_fmts[0] = MEDIA_BUS_FMT_FIXED;
+}
+
+static int imx_pd_bridge_atomic_check(struct drm_bridge *bridge,
+				      struct drm_bridge_state *bridge_state,
+				      struct drm_crtc_state *crtc_state,
+				      struct drm_connector_state *conn_state)
+{
+	struct drm_encoder *encoder = bridge_to_encoder(bridge);
 	struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
 	struct drm_display_info *di = &conn_state->connector->display_info;
 	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
+	struct drm_bridge_state *next_bridge_state = NULL;
+	struct drm_bridge *next_bridge;
+	u32 bus_flags, bus_fmt;
+	unsigned int i;
 
-	if (!imxpd->bus_format && di->num_bus_formats) {
-		imx_crtc_state->bus_flags = di->bus_flags;
-		imx_crtc_state->bus_format = di->bus_formats[0];
-	} else {
-		imx_crtc_state->bus_flags = imxpd->bus_flags;
-		imx_crtc_state->bus_format = imxpd->bus_format;
+	next_bridge = drm_bridge_chain_get_next_bridge(bridge);
+	if (next_bridge)
+		next_bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state,
+								    next_bridge);
+
+	bus_fmt = bridge_state->output_bus_cfg.fmt;
+	if (bus_fmt == MEDIA_BUS_FMT_FIXED)
+		bus_fmt = 0;
+
+	if (next_bridge_state)
+		bus_flags = next_bridge_state->input_bus_cfg.flags;
+	else if (!imxpd->bus_format && di->num_bus_formats)
+		bus_flags = di->bus_flags;
+	else
+		bus_flags = imxpd->bus_flags;
+
+	for (i = 0; bus_fmt && i < ARRAY_SIZE(imx_pd_bus_fmts); i++) {
+		if (imx_pd_bus_fmts[i] == bridge_state->output_bus_cfg.fmt)
+			break;
 	}
+
+	if (i == ARRAY_SIZE(imx_pd_bus_fmts))
+		return -EINVAL;
+
+	if (bus_flags &
+	    ~(DRM_BUS_FLAG_DE_LOW | DRM_BUS_FLAG_DE_HIGH |
+	      DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE |
+	      DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE))
+		return -EINVAL;
+
+	bridge_state->output_bus_cfg.flags = bus_flags;
+	bridge_state->input_bus_cfg.flags = bus_flags;
+	imx_crtc_state->bus_flags = bus_flags;
+	imx_crtc_state->bus_format = bridge_state->output_bus_cfg.fmt;
 	imx_crtc_state->di_hsync_pin = 2;
 	imx_crtc_state->di_vsync_pin = 3;
 
@@ -143,10 +245,12 @@ static const struct drm_encoder_funcs imx_pd_encoder_funcs = {
 	.destroy = imx_drm_encoder_destroy,
 };
 
-static const struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
-	.enable = imx_pd_encoder_enable,
-	.disable = imx_pd_encoder_disable,
-	.atomic_check = imx_pd_encoder_atomic_check,
+static const struct drm_bridge_funcs imx_pd_bridge_funcs = {
+	.enable = imx_pd_bridge_enable,
+	.disable = imx_pd_bridge_disable,
+	.atomic_check = imx_pd_bridge_atomic_check,
+	.atomic_get_input_bus_fmts = imx_pd_bridge_atomic_get_input_bus_fmts,
+	.atomic_get_output_bus_fmts = imx_pd_bridge_atomic_get_output_bus_fmts,
 };
 
 static int imx_pd_register(struct drm_device *drm,
@@ -166,7 +270,7 @@ static int imx_pd_register(struct drm_device *drm,
 	 */
 	imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
 
-	drm_encoder_helper_add(encoder, &imx_pd_encoder_helper_funcs);
+	encoder->bridge.funcs = &imx_pd_bridge_funcs;
 	drm_encoder_init(drm, encoder, &imx_pd_encoder_funcs,
 			 DRM_MODE_ENCODER_NONE, NULL);
 

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From: Boris Brezillon <boris.brezillon@collabora.com>
To: dri-devel@lists.freedesktop.org
Subject: [PATCH v2 18/21] drm/bridge: lvds-encoder: Implement basic bus format
 negotiation
Date: Mon, 26 Aug 2019 17:26:46 +0200
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Some LVDS encoder might support several input/output bus formats. Add
a way to describe the one used on a specific design by adding optional
'data-mapping' properties to the input/output ports.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
Changes in v2:
* Make the bus-format negotiation logic more generic
---
 .../display/bridge/lvds-transmitter.txt       |  12 ++
 drivers/gpu/drm/bridge/lvds-encoder.c         | 105 ++++++++++++++++++
 2 files changed, 117 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt b/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt
index 60091db5dfa5..db51eab216f7 100644
--- a/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt
+++ b/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt
@@ -36,6 +36,18 @@ graph bindings specified in Documentation/devicetree/bindings/graph.txt.
 - Video port 0 for parallel input
 - Video port 1 for LVDS output
 
+Optional port 0 node properties:
+
+- data-mapping: can be one of the following values
+	"rgb-24"
+	"rgb-18"
+
+Optional port 0 node properties:
+
+- data-mapping: can be one of the following values
+	"jeida-18"
+	"jeida-24"
+	"vesa-24"
 
 Example
 -------
diff --git a/drivers/gpu/drm/bridge/lvds-encoder.c b/drivers/gpu/drm/bridge/lvds-encoder.c
index 2ab2c234f26c..38cad7a7d828 100644
--- a/drivers/gpu/drm/bridge/lvds-encoder.c
+++ b/drivers/gpu/drm/bridge/lvds-encoder.c
@@ -6,6 +6,7 @@
 #include <linux/gpio/consumer.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/of_graph.h>
 #include <linux/platform_device.h>
 
@@ -16,6 +17,8 @@ struct lvds_encoder {
 	struct drm_bridge bridge;
 	struct drm_bridge *panel_bridge;
 	struct gpio_desc *powerdown_gpio;
+	u32 output_fmt;
+	u32 input_fmt;
 };
 
 static int lvds_encoder_attach(struct drm_bridge *bridge)
@@ -48,12 +51,86 @@ static void lvds_encoder_disable(struct drm_bridge *bridge)
 		gpiod_set_value_cansleep(lvds_encoder->powerdown_gpio, 1);
 }
 
+static void lvds_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
+					   struct drm_bridge_state *bridge_state,
+					   struct drm_crtc_state *crtc_state,
+					   struct drm_connector_state *conn_state,
+					   u32 output_fmt,
+					   unsigned int *num_input_fmts,
+					   u32 *input_fmts)
+{
+	struct lvds_encoder *lvds_encoder = container_of(bridge,
+							 struct lvds_encoder,
+							 bridge);
+
+	if (output_fmt == MEDIA_BUS_FMT_FIXED ||
+	    output_fmt == lvds_encoder->output_fmt)
+		*num_input_fmts = 1;
+	else
+		*num_input_fmts = 0;
+
+	if (*num_input_fmts && input_fmts)
+		input_fmts[0] = lvds_encoder->input_fmt;
+}
+
+static int lvds_encoder_atomic_check(struct drm_bridge *bridge,
+				     struct drm_bridge_state *bridge_state,
+				     struct drm_crtc_state *crtc_state,
+				     struct drm_connector_state *conn_state)
+{
+	/* Propagate the bus_flags. */
+	bridge_state->input_bus_cfg.flags = bridge_state->output_bus_cfg.flags;
+	return 0;
+}
+
 static struct drm_bridge_funcs funcs = {
 	.attach = lvds_encoder_attach,
 	.enable = lvds_encoder_enable,
 	.disable = lvds_encoder_disable,
+	.atomic_get_input_bus_fmts = lvds_atomic_get_input_bus_fmts,
+	.atomic_check = lvds_encoder_atomic_check,
 };
 
+struct of_data_mapping {
+	const char *name;
+	u32 id;
+};
+
+static const struct of_data_mapping output_data_mappings[] = {
+	{ "jeida-18", MEDIA_BUS_FMT_RGB666_1X7X3_SPWG },
+	{ "jeida-24", MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA },
+	{ "vesa-24", MEDIA_BUS_FMT_RGB888_1X7X4_SPWG },
+};
+
+static const struct of_data_mapping input_data_mappings[] = {
+	{ "rgb-24", MEDIA_BUS_FMT_RGB888_1X24 },
+	{ "rgb-18", MEDIA_BUS_FMT_RGB666_1X18 },
+};
+
+static int of_get_data_mapping(struct device_node *port,
+			       const struct of_data_mapping *mappings,
+			       unsigned int num_mappings,
+			       u32 *fmt)
+{
+	const char *name = NULL;
+	unsigned int i;
+
+	of_property_read_string(port, "data-mapping", &name);
+	if (!name) {
+		*fmt = MEDIA_BUS_FMT_FIXED;
+		return 0;
+	}
+
+	for (i = 0; i < num_mappings; i++) {
+		if (!strcmp(mappings[i].name, name)) {
+			*fmt = mappings[i].id;
+			return 0;
+		}
+	}
+
+	return -ENOTSUPP;
+}
+
 static int lvds_encoder_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -62,11 +139,15 @@ static int lvds_encoder_probe(struct platform_device *pdev)
 	struct device_node *panel_node;
 	struct drm_panel *panel;
 	struct lvds_encoder *lvds_encoder;
+	int ret;
 
 	lvds_encoder = devm_kzalloc(dev, sizeof(*lvds_encoder), GFP_KERNEL);
 	if (!lvds_encoder)
 		return -ENOMEM;
 
+	lvds_encoder->input_fmt = MEDIA_BUS_FMT_FIXED;
+	lvds_encoder->output_fmt = MEDIA_BUS_FMT_FIXED;
+
 	lvds_encoder->powerdown_gpio = devm_gpiod_get_optional(dev, "powerdown",
 							       GPIOD_OUT_HIGH);
 	if (IS_ERR(lvds_encoder->powerdown_gpio)) {
@@ -77,6 +158,21 @@ static int lvds_encoder_probe(struct platform_device *pdev)
 		return err;
 	}
 
+	port = of_graph_get_port_by_id(dev->of_node, 0);
+	if (!port) {
+		dev_dbg(dev, "port 0 not found\n");
+		return -ENXIO;
+	}
+
+	ret = of_get_data_mapping(port, input_data_mappings,
+				  ARRAY_SIZE(input_data_mappings),
+				  &lvds_encoder->input_fmt);
+	of_node_put(port);
+	if (ret) {
+		dev_dbg(dev, "unsupported input data-mapping\n");
+		return ret;
+	}
+
 	/* Locate the panel DT node. */
 	port = of_graph_get_port_by_id(dev->of_node, 1);
 	if (!port) {
@@ -84,6 +180,15 @@ static int lvds_encoder_probe(struct platform_device *pdev)
 		return -ENXIO;
 	}
 
+	ret = of_get_data_mapping(port, output_data_mappings,
+				  ARRAY_SIZE(output_data_mappings),
+				  &lvds_encoder->output_fmt);
+	if (ret) {
+		of_node_put(port);
+		dev_dbg(dev, "unsupported output data-mapping\n");
+		return ret;
+	}
+
 	endpoint = of_get_child_by_name(port, "endpoint");
 	of_node_put(port);
 	if (!endpoint) {

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From: Boris Brezillon <boris.brezillon@collabora.com>
To: dri-devel@lists.freedesktop.org
Subject: [PATCH v2 19/21] drm/bridge: panel: Propage bus format/flags
Date: Mon, 26 Aug 2019 17:26:47 +0200
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So that the previous bridge element in the chain knows which input
format the panel bridge expects.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
Laurent,

I intentionally left your comments unaddressed in this patch as I'm
more interested in discussing the preparation patches. Once we've
settled on something regarding the bus-format negotiation stuff I'll
rework the binding/driver to support the data-mapping DT prop.

Regards,

Boris

Changes in v2:
* Adjust things to match the new bus-format negotiation approach
---
 drivers/gpu/drm/bridge/panel.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
index 6cffeb4a42f2..3eeb40d37a89 100644
--- a/drivers/gpu/drm/bridge/panel.c
+++ b/drivers/gpu/drm/bridge/panel.c
@@ -120,6 +120,34 @@ static void panel_bridge_post_disable(struct drm_bridge *bridge)
 	drm_panel_unprepare(panel_bridge->panel);
 }
 
+static void
+panel_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
+				       struct drm_bridge_state *bridge_state,
+				       struct drm_crtc_state *crtc_state,
+				       struct drm_connector_state *conn_state,
+				       u32 output_fmt,
+				       unsigned int *num_input_fmts,
+				       u32 *input_fmts)
+{
+	*num_input_fmts = 1;
+	if (!input_fmts)
+		return;
+
+	input_fmts[0] = output_fmt;
+}
+
+static int panel_bridge_atomic_check(struct drm_bridge *bridge,
+				     struct drm_bridge_state *bridge_state,
+				     struct drm_crtc_state *crtc_state,
+				     struct drm_connector_state *conn_state)
+{
+	if (bridge_state->input_bus_cfg.fmt != bridge_state->output_bus_cfg.fmt)
+		return -EINVAL;
+
+	bridge_state->input_bus_cfg.flags = bridge_state->output_bus_cfg.flags;
+	return 0;
+}
+
 static const struct drm_bridge_funcs panel_bridge_bridge_funcs = {
 	.attach = panel_bridge_attach,
 	.detach = panel_bridge_detach,
@@ -127,6 +155,8 @@ static const struct drm_bridge_funcs panel_bridge_bridge_funcs = {
 	.enable = panel_bridge_enable,
 	.disable = panel_bridge_disable,
 	.post_disable = panel_bridge_post_disable,
+	.atomic_check = panel_bridge_atomic_check,
+	.atomic_get_input_bus_fmts = panel_bridge_atomic_get_input_bus_fmts,
 };
 
 /**

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Cc: Nikita Yushchenko <nikita.yoush@cogentembedded.com>,
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 Neil Armstrong <narmstrong@baylibre.com>,
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Add a new entry for the Toshiba LTA089AC29000 panel.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
 .../display/panel/toshiba,lt089ac29000.txt    |  5 ++-
 drivers/gpu/drm/panel/panel-simple.c          | 36 +++++++++++++++++++
 2 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/display/panel/toshiba,lt089ac29000.txt b/Documentation/devicetree/bindings/display/panel/toshiba,lt089ac29000.txt
index 89826116628c..26ebfa098966 100644
--- a/Documentation/devicetree/bindings/display/panel/toshiba,lt089ac29000.txt
+++ b/Documentation/devicetree/bindings/display/panel/toshiba,lt089ac29000.txt
@@ -1,7 +1,10 @@
 Toshiba 8.9" WXGA (1280x768) TFT LCD panel
 
 Required properties:
-- compatible: should be "toshiba,lt089ac29000"
+- compatible: should be one of the following
+	      "toshiba,lt089ac29000"
+	      "toshiba,lta089ac29000"
+
 - power-supply: as specified in the base binding
 
 This binding is compatible with the simple-panel binding, which is specified
diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 28fa6ba7b767..0601570404b1 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -2915,6 +2915,39 @@ static const struct panel_desc toshiba_lt089ac29000 = {
 	.bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE,
 };
 
+static const struct drm_display_mode toshiba_lta089ac29000_mode = {
+	.clock = 79500,
+	.hdisplay = 1280,
+	.hsync_start = 1280 + 192,
+	.hsync_end = 1280 + 192 + 128,
+	.htotal = 1280 + 192 + 128 + 64,
+	.vdisplay = 768,
+	.vsync_start = 768 + 20,
+	.vsync_end = 768 + 20 + 7,
+	.vtotal = 768 + 20 + 7 + 3,
+	.vrefresh = 60,
+};
+
+static const struct panel_desc toshiba_lta089ac29000 = {
+	.modes = &toshiba_lta089ac29000_mode,
+	.num_modes = 1,
+	.size = {
+		.width = 194,
+		.height = 116,
+	},
+	/*
+	 * FIXME:
+	 * The panel supports 2 bus formats: jeida-24 and jeida-18. The
+	 * mode is selected through the 8b6b_SEL pin. If anyone ever needs
+	 * support for jeida-18 we should probably parse the 'data-mapping'
+	 * property.
+	 * In the unlikely event where 8b6b_SEL is connected to a GPIO, we'd
+	 * need a new infra to allow bus format negotiation at the panel level.
+	 */
+	.bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA,
+	.bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE,
+};
+
 static const struct drm_display_mode tpk_f07a_0102_mode = {
 	.clock = 33260,
 	.hdisplay = 800,
@@ -3369,6 +3402,9 @@ static const struct of_device_id platform_of_match[] = {
 	}, {
 		.compatible = "toshiba,lt089ac29000",
 		.data = &toshiba_lt089ac29000,
+	}, {
+		.compatible = "toshiba,lta089ac29000",
+		.data = &toshiba_lta089ac29000,
 	}, {
 		.compatible = "tpk,f07a-0102",
 		.data = &tpk_f07a_0102,

From patchwork Mon Aug 26 15:26:49 2019
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X-Patchwork-Submitter: Boris Brezillon <boris.brezillon@collabora.com>
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From: Boris Brezillon <boris.brezillon@collabora.com>
To: dri-devel@lists.freedesktop.org
Subject: [PATCH v2 21/21] ARM: dts: imx: imx51-zii-rdu1: Fix the display
 pipeline definition
Date: Mon, 26 Aug 2019 17:26:49 +0200
Message-Id: <20190826152649.13820-22-boris.brezillon@collabora.com>
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 Jernej Skrabec <jernej.skrabec@siol.net>,
 Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
 Neil Armstrong <narmstrong@baylibre.com>,
 Andrey Smirnov <andrew.smirnov@gmail.com>, Jonas Karlman <jonas@kwiboo.se>,
 Seung-Woo Kim <sw0312.kim@samsung.com>,
 Kyungmin Park <kyungmin.park@samsung.com>,
 Thierry Reding <thierry.reding@gmail.com>,
 Chris Healy <Chris.Healy@zii.aero>,
 Boris Brezillon <boris.brezillon@collabora.com>, kernel@collabora.com,
 Sam Ravnborg <sam@ravnborg.org>
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The current definition does not represent the exact display pipeline we
have on the board: the LVDS panel is actually connected through a
parallel -> LVDS bridge. Let's fix that so the driver can select the
proper bus format on the CRTC end.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
Changes in v2:
* None
---
 arch/arm/boot/dts/imx51-zii-rdu1.dts | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/imx51-zii-rdu1.dts b/arch/arm/boot/dts/imx51-zii-rdu1.dts
index 3596060f52e7..b9c8e93cd5db 100644
--- a/arch/arm/boot/dts/imx51-zii-rdu1.dts
+++ b/arch/arm/boot/dts/imx51-zii-rdu1.dts
@@ -95,6 +95,28 @@
 			reg = <1>;
 
 			display_out: endpoint {
+				remote-endpoint = <&lvds_encoder_in>;
+			};
+		};
+	};
+
+	lvds-encoder {
+		compatible = "ti,sn75lvds83", "lvds-encoder";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		port@0 {
+			reg = <0>;
+			data-mapping = "rgb-24";
+			lvds_encoder_in: endpoint {
+				remote-endpoint = <&display_out>;
+			};
+		};
+
+		port@1 {
+			reg = <1>;
+			data-mapping = "jeida-24";
+			lvds_encoder_out: endpoint {
 				remote-endpoint = <&panel_in>;
 			};
 		};
@@ -110,7 +132,7 @@
 
 		port {
 			panel_in: endpoint {
-				remote-endpoint = <&display_out>;
+				remote-endpoint = <&lvds_encoder_out>;
 			};
 		};
 	};