[v10,08/11] drm/bridge: ti-sn65dsi86: Add support for the DP AUX bus

Commit Message

Doug Anderson June 11, 2021, 5:17 p.m. UTC

We want to provide our panel with access to the DP AUX channel. The
way to do this is to let our panel be a child of ours using the fancy
new DP AUX bus support.

Signed-off-by: Douglas Anderson <[e-mail]>
Acked-by: Linus Walleij <[e-mail]>
Reviewed-by: Lyude Paul <[e-mail]>
---

(no changes since v9)

Changes in v9:
- Rebased atop v9 ("Promote the AUX channel") patch.

Changes in v7:
- Patch to support for DP AUX bus on ti-sn65dsi86 new for v7.

 drivers/gpu/drm/bridge/Kconfig        | 1 +
 drivers/gpu/drm/bridge/ti-sn65dsi86.c | 6 ++++++
 2 files changed, 7 insertions(+)

Patch

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 85b673613687..431b6e12a81f 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -303,6 +303,7 @@  config DRM_TI_SN65DSI86
 	select DRM_PANEL
 	select DRM_MIPI_DSI
 	select AUXILIARY_BUS
+	select DRM_DP_AUX_BUS
 	help
 	  Texas Instruments SN65DSI86 DSI to eDP Bridge driver
 
diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index 8e61005cf4ad..32bd35c98d95 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -23,6 +23,7 @@ 
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_bridge.h>
+#include <drm/drm_dp_aux_bus.h>
 #include <drm/drm_dp_helper.h>
 #include <drm/drm_mipi_dsi.h>
 #include <drm/drm_of.h>
@@ -1426,12 +1427,17 @@  static int ti_sn_aux_probe(struct auxiliary_device *adev,
 			   const struct auxiliary_device_id *id)
 {
 	struct ti_sn65dsi86 *pdata = dev_get_drvdata(adev->dev.parent);
+	int ret;
 
 	pdata->aux.name = "ti-sn65dsi86-aux";
 	pdata->aux.dev = &adev->dev;
 	pdata->aux.transfer = ti_sn_aux_transfer;
 	drm_dp_aux_init(&pdata->aux);
 
+	ret = devm_of_dp_aux_populate_ep_devices(&pdata->aux);
+	if (ret)
+		return ret;
+
 	/*
 	 * The eDP to MIPI bridge parts don't work until the AUX channel is
 	 * setup so we don't add it in the main driver probe, we add it now.