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Wed, 31 Mar 2021 06:49:36 +0000 From: Liu Ying To: dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org Cc: airlied@linux.ie, daniel@ffwll.ch, robh+dt@kernel.org, shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com, mchehab@kernel.org, a.hajda@samsung.com, narmstrong@baylibre.com, Laurent.pinchart@ideasonboard.com, jonas@kwiboo.se, jernej.skrabec@siol.net, kishon@ti.com, vkoul@kernel.org, robert.foss@linaro.org, lee.jones@linaro.org, marcel.ziswiler@toradex.com Subject: [PATCH v7 10/14] drm/bridge: imx: Add LDB driver helper support Date: Wed, 31 Mar 2021 14:33:21 +0800 Message-Id: <1617172405-12962-11-git-send-email-victor.liu@nxp.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1617172405-12962-1-git-send-email-victor.liu@nxp.com> References: <1617172405-12962-1-git-send-email-victor.liu@nxp.com> X-Originating-IP: [119.31.174.66] X-ClientProxiedBy: MA1PR01CA0105.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a00:1::21) To VI1PR04MB3983.eurprd04.prod.outlook.com (2603:10a6:803:4c::16) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost.localdomain (119.31.174.66) by MA1PR01CA0105.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a00:1::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.20.3977.26 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: 3Xm3GJ5MgkZqKUcU8GZ0Pfb5iWUA8pEXtCabOeXCEeGbyAzMYwfJUNs1wYlRAca1xkRxDQDNGZkSPh6SYJuRX0lunjur8vZjBPqEI60/U51SRqgTkRCHHX6yfDkdj4fJAvvzYMUUCPPqP1ALafzbZM/Tha8NTiFbZJSgcJxtOt5eBLDinI/TFdW5Hli9Fet9h2YRLK5NMW+f1hTIgbUTHAzb7dmHI6/58PbMFzESnzvF4fzy5rpc8zfSsVglpPOd/9M62YA23M0UU8rLIp9CvsRqltvZpaKeztxLOeVEIrNQ+NShYPdlFaQIhDWqYcqw+8iS2/yd0NMoMIrBBj1AwE13NeCln/uu7XPLbkS8Z3NhLaX/FQ2RlFUxx1HnEmz9eoBu55m7Hrxs9bqZjhYiIxzWvjqwp2pLwWHlipohehek2naKorx6AjmE3qDELPceGREasJQuqx1FH7kgjBgudqu5C4QvPQ3BjI3h2sNWrxh+jQsRfuZSS5weMzpdskY9zd4TX4y9a8m2SaHFg4kL3KZx2xVQy15+sm5kplovKjqf8pUQkR6GwlFGeTd/edamOQStTJ6sj017NkK3rjshcJwr+zoetRYapg2gMIXmfcn76b9agHCS/AiDKNo8vhkdOgbGeFELNHdNedj7FRKQtb6USPPWSup2ChqYaX6zbdC2mKk57HJAnqcQ5+yAIchrpSVI7mt4KEvtdRBAI96LRNuyEyqR72naMs7nlGB+/xv9lpOlTXBy2qZLTf4M4dsUAtUWigMFWvBFcAiC6xUMe17r/6YZj0jlStwAwzZbYWCY4snyPBrLYLrvZoKCvy5DwArrBkDrR8NYyNNxEz26tp2J8pjGtnZlOV6Z1pQQPHjqh2w0tpHczHsxzQD2qaiOByTQMKz6I1bOsq/SQxidjAvno2qEROs6hxYv2vktgBsLT75ti6BqO9z9bi3Rvmfel/cWZg7VKyKv03CHm8z3ItEajfkxnqIvUu0XwRz0fU/Nn9NIRV3igmndREtMeiaDV4QEciZV+I63J/WTD9MbG3GdEtVHrJ0fByGzM3ZccW1npalKUuau6ZQnltUDep6Fs7Jv+Kv4m4QzkzrRv5j4qDZd1AdRWB/Lio8Q7ZjQtI9OLBya1BVSWeqUN8pU+kR7belkFWR3Pn0+Alg8P6mcgwViGX5rIjtzlpuIPH80ix/57aWUNP1ED07AteaGSa2n8NcC3lGbWgJ+xx34QpQQLmbe62XZsxk0CvXjFQkL4UKRH0002r7RwWQgg7SOg1VR2FKR/qALQbTw4f23SBCYpmv4FLaJl2+JlySHirczviA7LcAaq5utyIMnSWD2wH5Q X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 971081ec-f739-4a90-8c82-08d8f4112615 X-MS-Exchange-CrossTenant-AuthSource: VI1PR04MB3983.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 31 Mar 2021 06:49:36.6151 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: j/HRRvwzJCRouwXHxZ3/k8TP7udLchSFH7mRGtoWP8J7JQZdIoiIswu9bqvEnBIptB1MmgAibo+pZ9aqF4+dsg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR0401MB2318 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org This patch adds a helper to support LDB drm bridge drivers for i.MX SoCs. Helper functions supported by this helper should implement common logics for all LDB modules embedded in i.MX SoCs. Tested-by: Marcel Ziswiler # Colibri iMX8X, LT170410-2WHC, LP156WF1 Reviewed-by: Robert Foss Signed-off-by: Liu Ying --- Marcel, I add your T-b tag from v6, let me know if you want me to drop it, as the checkpatch fix in v7 is trivial. v6->v7: * Fix below complaints from 'checkpatch.pl --strict'. (Robert) - 'Alignment should match open parenthesis' - 'Prefer using the BIT macro' * Add Marcel's T-b tag. * Add Robert's R-b tag. v5->v6: * No change. v4->v5: * Make imx-ldb-helper be a pure object to be linked with i.MX8qxp LDB bridge driver and i.MX8qm LDB bridge driver. (Robert) * Move 'imx_ldb_helper.h' to 'drivers/gpu/drm/bridge/imx/imx-ldb-helper.h'. (Robert) * s/__FSL_IMX_LDB__/__IMX_LDB_HELPER__/ for 'imx-ldb-helper.h'. v3->v4: * No change. v2->v3: * Call syscon_node_to_regmap() to get regmap instead of syscon_regmap_lookup_by_phandle(). v1->v2: * No change. drivers/gpu/drm/bridge/imx/imx-ldb-helper.c | 232 ++++++++++++++++++++++++++++ drivers/gpu/drm/bridge/imx/imx-ldb-helper.h | 98 ++++++++++++ 2 files changed, 330 insertions(+) create mode 100644 drivers/gpu/drm/bridge/imx/imx-ldb-helper.c create mode 100644 drivers/gpu/drm/bridge/imx/imx-ldb-helper.h diff --git a/drivers/gpu/drm/bridge/imx/imx-ldb-helper.c b/drivers/gpu/drm/bridge/imx/imx-ldb-helper.c new file mode 100644 index 00000000..67425fc --- /dev/null +++ b/drivers/gpu/drm/bridge/imx/imx-ldb-helper.c @@ -0,0 +1,232 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2012 Sascha Hauer, Pengutronix + * Copyright 2019,2020 NXP + */ + +#include +#include +#include + +#include +#include +#include + +#include "imx-ldb-helper.h" + +bool ldb_channel_is_single_link(struct ldb_channel *ldb_ch) +{ + return ldb_ch->link_type == LDB_CH_SINGLE_LINK; +} + +bool ldb_channel_is_split_link(struct ldb_channel *ldb_ch) +{ + return ldb_ch->link_type == LDB_CH_DUAL_LINK_EVEN_ODD_PIXELS || + ldb_ch->link_type == LDB_CH_DUAL_LINK_ODD_EVEN_PIXELS; +} + +int ldb_bridge_atomic_check_helper(struct drm_bridge *bridge, + struct drm_bridge_state *bridge_state, + struct drm_crtc_state *crtc_state, + struct drm_connector_state *conn_state) +{ + struct ldb_channel *ldb_ch = bridge->driver_private; + + ldb_ch->in_bus_format = bridge_state->input_bus_cfg.format; + ldb_ch->out_bus_format = bridge_state->output_bus_cfg.format; + + return 0; +} + +void ldb_bridge_mode_set_helper(struct drm_bridge *bridge, + const struct drm_display_mode *mode, + const struct drm_display_mode *adjusted_mode) +{ + struct ldb_channel *ldb_ch = bridge->driver_private; + struct ldb *ldb = ldb_ch->ldb; + bool is_split = ldb_channel_is_split_link(ldb_ch); + + if (is_split) + ldb->ldb_ctrl |= LDB_SPLIT_MODE_EN; + + switch (ldb_ch->out_bus_format) { + case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG: + break; + case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG: + if (ldb_ch->chno == 0 || is_split) + ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24; + if (ldb_ch->chno == 1 || is_split) + ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24; + break; + case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA: + if (ldb_ch->chno == 0 || is_split) + ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24 | + LDB_BIT_MAP_CH0_JEIDA; + if (ldb_ch->chno == 1 || is_split) + ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24 | + LDB_BIT_MAP_CH1_JEIDA; + break; + } +} + +void ldb_bridge_enable_helper(struct drm_bridge *bridge) +{ + struct ldb_channel *ldb_ch = bridge->driver_private; + struct ldb *ldb = ldb_ch->ldb; + + /* + * Platform specific bridge drivers should set ldb_ctrl properly + * for the enablement, so just write the ctrl_reg here. + */ + regmap_write(ldb->regmap, ldb->ctrl_reg, ldb->ldb_ctrl); +} + +void ldb_bridge_disable_helper(struct drm_bridge *bridge) +{ + struct ldb_channel *ldb_ch = bridge->driver_private; + struct ldb *ldb = ldb_ch->ldb; + bool is_split = ldb_channel_is_split_link(ldb_ch); + + if (ldb_ch->chno == 0 || is_split) + ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK; + if (ldb_ch->chno == 1 || is_split) + ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK; + + regmap_write(ldb->regmap, ldb->ctrl_reg, ldb->ldb_ctrl); +} + +int ldb_bridge_attach_helper(struct drm_bridge *bridge, + enum drm_bridge_attach_flags flags) +{ + struct ldb_channel *ldb_ch = bridge->driver_private; + struct ldb *ldb = ldb_ch->ldb; + + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) { + DRM_DEV_ERROR(ldb->dev, + "do not support creating a drm_connector\n"); + return -EINVAL; + } + + if (!bridge->encoder) { + DRM_DEV_ERROR(ldb->dev, "missing encoder\n"); + return -ENODEV; + } + + return drm_bridge_attach(bridge->encoder, + ldb_ch->next_bridge, bridge, + DRM_BRIDGE_ATTACH_NO_CONNECTOR); +} + +int ldb_init_helper(struct ldb *ldb) +{ + struct device *dev = ldb->dev; + struct device_node *np = dev->of_node; + struct device_node *child; + int ret; + u32 i; + + ldb->regmap = syscon_node_to_regmap(np->parent); + if (IS_ERR(ldb->regmap)) { + ret = PTR_ERR(ldb->regmap); + if (ret != -EPROBE_DEFER) + DRM_DEV_ERROR(dev, "failed to get regmap: %d\n", ret); + return ret; + } + + for_each_available_child_of_node(np, child) { + struct ldb_channel *ldb_ch; + + ret = of_property_read_u32(child, "reg", &i); + if (ret || i > MAX_LDB_CHAN_NUM - 1) { + ret = -EINVAL; + DRM_DEV_ERROR(dev, + "invalid channel node address: %u\n", i); + of_node_put(child); + return ret; + } + + ldb_ch = ldb->channel[i]; + ldb_ch->ldb = ldb; + ldb_ch->chno = i; + ldb_ch->is_available = true; + ldb_ch->np = child; + + ldb->available_ch_cnt++; + } + + return 0; +} + +int ldb_find_next_bridge_helper(struct ldb *ldb) +{ + struct device *dev = ldb->dev; + struct ldb_channel *ldb_ch; + int ret, i; + + for (i = 0; i < MAX_LDB_CHAN_NUM; i++) { + ldb_ch = ldb->channel[i]; + + if (!ldb_ch->is_available) + continue; + + ret = drm_of_find_panel_or_bridge(ldb_ch->np, 1, 0, + &ldb_ch->panel, + &ldb_ch->next_bridge); + if (ret) { + if (ret != -EPROBE_DEFER) + DRM_DEV_ERROR(dev, + "failed to find panel or bridge: %d\n", + ret); + return ret; + } + + if (ldb_ch->panel) { + ldb_ch->next_bridge = + devm_drm_panel_bridge_add(dev, ldb_ch->panel); + if (IS_ERR(ldb_ch->next_bridge)) { + ret = PTR_ERR(ldb_ch->next_bridge); + DRM_DEV_ERROR(dev, + "failed to add panel bridge: %d\n", + ret); + return ret; + } + } + } + + return 0; +} + +void ldb_add_bridge_helper(struct ldb *ldb, + const struct drm_bridge_funcs *bridge_funcs) +{ + struct ldb_channel *ldb_ch; + int i; + + for (i = 0; i < MAX_LDB_CHAN_NUM; i++) { + ldb_ch = ldb->channel[i]; + + if (!ldb_ch->is_available) + continue; + + ldb_ch->bridge.driver_private = ldb_ch; + ldb_ch->bridge.funcs = bridge_funcs; + ldb_ch->bridge.of_node = ldb_ch->np; + + drm_bridge_add(&ldb_ch->bridge); + } +} + +void ldb_remove_bridge_helper(struct ldb *ldb) +{ + struct ldb_channel *ldb_ch; + int i; + + for (i = 0; i < MAX_LDB_CHAN_NUM; i++) { + ldb_ch = ldb->channel[i]; + + if (!ldb_ch->is_available) + continue; + + drm_bridge_remove(&ldb_ch->bridge); + } +} diff --git a/drivers/gpu/drm/bridge/imx/imx-ldb-helper.h b/drivers/gpu/drm/bridge/imx/imx-ldb-helper.h new file mode 100644 index 00000000..54dfe28 --- /dev/null +++ b/drivers/gpu/drm/bridge/imx/imx-ldb-helper.h @@ -0,0 +1,98 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ + +/* + * Copyright 2019,2020 NXP + */ + +#ifndef __IMX_LDB_HELPER__ +#define __IMX_LDB_HELPER__ + +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include + +#define LDB_CH0_MODE_EN_TO_DI0 BIT(0) +#define LDB_CH0_MODE_EN_TO_DI1 (3 << 0) +#define LDB_CH0_MODE_EN_MASK (3 << 0) +#define LDB_CH1_MODE_EN_TO_DI0 BIT(2) +#define LDB_CH1_MODE_EN_TO_DI1 (3 << 2) +#define LDB_CH1_MODE_EN_MASK (3 << 2) +#define LDB_SPLIT_MODE_EN BIT(4) +#define LDB_DATA_WIDTH_CH0_24 BIT(5) +#define LDB_BIT_MAP_CH0_JEIDA BIT(6) +#define LDB_DATA_WIDTH_CH1_24 BIT(7) +#define LDB_BIT_MAP_CH1_JEIDA BIT(8) +#define LDB_DI0_VS_POL_ACT_LOW BIT(9) +#define LDB_DI1_VS_POL_ACT_LOW BIT(10) + +#define MAX_LDB_CHAN_NUM 2 + +enum ldb_channel_link_type { + LDB_CH_SINGLE_LINK, + LDB_CH_DUAL_LINK_EVEN_ODD_PIXELS, + LDB_CH_DUAL_LINK_ODD_EVEN_PIXELS, +}; + +struct ldb; + +struct ldb_channel { + struct ldb *ldb; + struct drm_bridge bridge; + struct drm_panel *panel; + struct drm_bridge *next_bridge; + struct device_node *np; + u32 chno; + bool is_available; + u32 in_bus_format; + u32 out_bus_format; + enum ldb_channel_link_type link_type; +}; + +struct ldb { + struct regmap *regmap; + struct device *dev; + struct ldb_channel *channel[MAX_LDB_CHAN_NUM]; + unsigned int ctrl_reg; + u32 ldb_ctrl; + unsigned int available_ch_cnt; +}; + +#define bridge_to_ldb_ch(b) container_of(b, struct ldb_channel, bridge) + +bool ldb_channel_is_single_link(struct ldb_channel *ldb_ch); +bool ldb_channel_is_split_link(struct ldb_channel *ldb_ch); + +int ldb_bridge_atomic_check_helper(struct drm_bridge *bridge, + struct drm_bridge_state *bridge_state, + struct drm_crtc_state *crtc_state, + struct drm_connector_state *conn_state); + +void ldb_bridge_mode_set_helper(struct drm_bridge *bridge, + const struct drm_display_mode *mode, + const struct drm_display_mode *adjusted_mode); + +void ldb_bridge_enable_helper(struct drm_bridge *bridge); + +void ldb_bridge_disable_helper(struct drm_bridge *bridge); + +int ldb_bridge_attach_helper(struct drm_bridge *bridge, + enum drm_bridge_attach_flags flags); + +int ldb_init_helper(struct ldb *ldb); + +int ldb_find_next_bridge_helper(struct ldb *ldb); + +void ldb_add_bridge_helper(struct ldb *ldb, + const struct drm_bridge_funcs *bridge_funcs); + +void ldb_remove_bridge_helper(struct ldb *ldb); + +#endif /* __IMX_LDB_HELPER__ */