[PATCH v10 00/18] Apply drm_bridge_connector and panel_bridge helper for the Analogix DP driver

[PATCH v10 00/18] Apply drm_bridge_connector and panel_bridge helper for the Analogix DP driver

[Damon Ding]

Picked from:
https://lore.kernel.org/all/20251217093321.3108939-1-damon.ding@rock-chips.com/

PATCH 1 is to add a new parameter to store the point of next bridge.
PATCH 2 is to make legacy bridge driver more universal.
PATCH 3-10 are preparations for apply drm_bridge_connector helper.
PATCH 11-12 is to apply the drm_bridge_connector helper.
PATCH 13-15 are to move the panel/bridge parsing to the Analogix side.
PATCH 16 is to attach the next bridge on Analogix side uniformly.
PATCH 17-18 are to apply the panel_bridge helper.

The following reviewed commits, which to make codes more concise, are
rebased to the front of this patch series:

https://lore.kernel.org/all/20251110085823.1197472-1-damon.ding@rock-chips.com/
https://lore.kernel.org/all/20251111022103.1350183-1-damon.ding@rock-chips.com/

Damon Ding (18):
  drm/bridge: analogix_dp: Add &analogix_dp_plat_data.next_bridge
  drm/bridge: Move legacy bridge driver out of imx directory for
    multi-platform use
  drm/exynos: exynos_dp: Remove &exynos_dp_device.ptn_bridge
  drm/exynos: exynos_dp: Remove unused &exynos_dp_device.connector
  drm/exynos: exynos_dp: Apply of-display-mode-bridge to parse the
    display-timings node
  drm/bridge: analogix_dp: Remove redundant
    &analogix_dp_plat_data.skip_connector
  drm/bridge: analogix_dp: Move the color format check to
    .atomic_check() for Rockchip platforms
  drm/bridge: analogix_dp: Remove unused
    &analogix_dp_plat_data.get_modes()
  drm/bridge: analogix_dp: Remove unused struct drm_connector* for
    &analogix_dp_plat_data.attach()
  drm/bridge: analogix_dp: Pass struct drm_atomic_state* for
    analogix_dp_bridge_mode_set()
  drm/bridge: analogix_dp: Apply drm_bridge_connector helper
  drm/bridge: analogix_dp: Remove unnecessary
    &analogix_dp_device.connector
  drm/bridge: analogix_dp: Add new API analogix_dp_finish_probe()
  drm/rockchip: analogix_dp: Apply analogix_dp_finish_probe()
  drm/exynos: exynos_dp: Apply analogix_dp_finish_probe()
  drm/bridge: analogix_dp: Attach the next bridge in
    analogix_dp_bridge_attach()
  drm/bridge: analogix_dp: Remove bridge disabing and panel unpreparing
    in analogix_dp_unbind()
  drm/bridge: analogix_dp: Apply panel_bridge helper

 drivers/gpu/drm/bridge/Kconfig                |  10 +
 drivers/gpu/drm/bridge/Makefile               |   1 +
 drivers/gpu/drm/bridge/analogix/Kconfig       |   1 +
 .../drm/bridge/analogix/analogix_dp_core.c    | 236 +++++++++---------
 .../drm/bridge/analogix/analogix_dp_core.h    |   1 -
 drivers/gpu/drm/bridge/imx/Kconfig            |  10 -
 drivers/gpu/drm/bridge/imx/Makefile           |   1 -
 .../gpu/drm/bridge/imx/imx-legacy-bridge.c    |  91 -------
 .../gpu/drm/bridge/of-display-mode-bridge.c   |  93 +++++++
 drivers/gpu/drm/exynos/Kconfig                |   1 +
 drivers/gpu/drm/exynos/exynos_dp.c            | 110 ++------
 drivers/gpu/drm/imx/ipuv3/Kconfig             |   4 +-
 drivers/gpu/drm/imx/ipuv3/imx-ldb.c           |   6 +-
 drivers/gpu/drm/imx/ipuv3/parallel-display.c  |   5 +-
 .../gpu/drm/rockchip/analogix_dp-rockchip.c   |  67 +----
 include/drm/bridge/analogix_dp.h              |   8 +-
 include/drm/bridge/imx.h                      |  17 --
 include/drm/bridge/of-display-mode-bridge.h   |  17 ++
 18 files changed, 293 insertions(+), 386 deletions(-)
 delete mode 100644 drivers/gpu/drm/bridge/imx/imx-legacy-bridge.c
 create mode 100644 drivers/gpu/drm/bridge/of-display-mode-bridge.c
 delete mode 100644 include/drm/bridge/imx.h
 create mode 100644 include/drm/bridge/of-display-mode-bridge.h

---

Changes in v2:
- Update Exynos DP driver synchronously.
- Move the panel/bridge parsing to the Analogix side.

Changes in v3:
- Rebase for the existing devm_drm_bridge_alloc() applying commit.
- Fix the typographical error of panel/bridge check in exynos_dp_bind().
- Squash all commits related to skip_connector deletion in both Exynos and
  Analogix code into one.
- Apply panel_bridge helper to make the codes more concise.
- Fix the handing of bridge in analogix_dp_bridge_get_modes().
- Remove unnecessary parameter struct drm_connector* for callback
  &analogix_dp_plat_data.attach().
- In order to decouple the connector driver and the bridge driver, move
  the bridge connector initilization to the Rockchip and Exynos sides.

Changes in v4:
- Rebase for the applied &drm_bridge_funcs.detect() modification commit.
- Rename analogix_dp_find_panel_or_bridge() to analogix_dp_finish_probe().
- Drop the drmm_encoder_init() modification commit.
- Rename the &analogix_dp_plat_data.bridge to
  &analogix_dp_plat_data.next_bridge.

Changes in v5:
- Add legacy bridge to parse the display-timings node under the dp node
  for Exynos side.
- Move color format check to &drm_connector_helper_funcs.atomic_check()
  in order to get rid of &analogix_dp_plat_data.get_modes().
- Remove unused callback &analogix_dp_plat_data.get_modes().
- Distinguish the &drm_bridge->ops of Analogix bridge based on whether
  the downstream device is a panel, a bridge or neither.
- Select DRM_DISPLAY_DP_AUX_BUS for DRM_ANALOGIX_DP, and remove it for
  ROCKCHIP_ANALOGIX_DP.
- Apply rockchip_dp_attach() to support the next bridge attachment for
  the Rockchip side.
- Move next_bridge attachment from Analogix side to Rockchip/Exynos sides.

Changes in v6:
- Move legacy bridge driver out of imx directory for multi-platform use.
- Apply DRM legacy bridge to parse display timings intead of implementing
  the same codes only for Exynos DP.
- Ensure last bridge determines EDID/modes detection capabilities in DRM
  bridge_connector driver.
- Remove unnecessary drm_bridge_get_modes() in
  analogix_dp_bridge_get_modes().
- Simplify analogix_dp_bridge_edid_read().
- If the next is a bridge, set DRM_BRIDGE_OP_DETECT and return
  connector_status_connected in analogix_dp_bridge_detect().
- Set flag DRM_BRIDGE_ATTACH_NO_CONNECTOR for bridge attachment while
  binding. Meanwhile, make DRM_BRIDGE_ATTACH_NO_CONNECTOR unsuppported
  in analogix_dp_bridge_attach().
- Move the next bridge attachment to the Analogix side rather than
  scattered on Rockchip and Exynos sides.
- Remove the unnecessary analogix_dp_bridge_get_modes().
- Squash [PATCH v5 15/17] into [PATCH v5 17/17].
- Fix the &drm_bridge->ops to DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_DETECT.

Changes in v7:
- As Luca suggested, simplify the code and related comment for bridge_connector
  modifications. Additionally, move the commit related to bridge_connector to
  the top of this patch series.
- Rename legacy-bridge driver to of-display-mode-bridge driver.
- Remove unnecessary API drm_bridge_is_legacy() and apply a temporary flag
  &exynos_dp_device.has_of_bridge instead, which will be removed finally.
- Remove exynos_dp_legacy_bridge_init() and inline API
  devm_drm_of_display_mode_bridge().

Changes in v8:
- Adapt the related modifications to the newest bridge_connector driver.

Changes in v9:
- Fix the Kconfig help text for CONFIG_DRM_OF_DISPLAY_MODE_BRIDGE.
- Add Tested-by tag from Heiko.

Changes in v10:
- Fix to use dev_err_probe() in newly added API analogix_dp_finish_probe().
- Expaned commit message for [PATCH v9 9/15] and [PATCH v9 10/15].
- Split [PATCH v9 9/15] into serval smaller commits.
- Add Reviewed-by tags from Luca.

-- 
2.34.1

[PATCH v10 01/18] drm/bridge: analogix_dp: Add &analogix_dp_plat_data.next_bridge

[Damon Ding]

In order to move the panel/bridge parsing and attachmenet to the
Analogix side, add component struct drm_bridge *next_bridge to
platform data struct analogix_dp_plat_data.

The movement makes sense because the panel/bridge should logically
be positioned behind the Analogix bridge in the display pipeline.

Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de> (on rk3588)

---

Changes in v4:
- Rename the &analogix_dp_plat_data.bridge to
  &analogix_dp_plat_data.next_bridge

Changes in v9:
- Add Reviewed-by and Tested-by tags.
---
 include/drm/bridge/analogix_dp.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/drm/bridge/analogix_dp.h b/include/drm/bridge/analogix_dp.h
index cf17646c1310..582357c20640 100644
--- a/include/drm/bridge/analogix_dp.h
+++ b/include/drm/bridge/analogix_dp.h
@@ -27,6 +27,7 @@ static inline bool is_rockchip(enum analogix_dp_devtype type)
 struct analogix_dp_plat_data {
 	enum analogix_dp_devtype dev_type;
 	struct drm_panel *panel;
+	struct drm_bridge *next_bridge;
 	struct drm_encoder *encoder;
 	struct drm_connector *connector;
 	bool skip_connector;
-- 
2.34.1

[PATCH v10 02/18] drm/bridge: Move legacy bridge driver out of imx directory for multi-platform use

[Damon Ding]

As suggested by Dmitry, the DRM legacy bridge driver can be pulled
out of imx/ subdir for multi-platform use. The driver is also renamed
to make it more generic and suitable for platforms other than i.MX.

Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
Suggested-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de> (on rk3588)

---

Changes in v7:
- Rename legacy-bridge to of-display-mode-bridge.
- Remove unnecessary API drm_bridge_is_legacy().

Changes in v9:
- Fix the Kconfig help text.
- Add Tested-by tag.

Changes in v10:
- Add Reviewed-by tag.
---
 drivers/gpu/drm/bridge/Kconfig                | 10 ++
 drivers/gpu/drm/bridge/Makefile               |  1 +
 drivers/gpu/drm/bridge/imx/Kconfig            | 10 --
 drivers/gpu/drm/bridge/imx/Makefile           |  1 -
 .../gpu/drm/bridge/imx/imx-legacy-bridge.c    | 91 ------------------
 .../gpu/drm/bridge/of-display-mode-bridge.c   | 93 +++++++++++++++++++
 drivers/gpu/drm/imx/ipuv3/Kconfig             |  4 +-
 drivers/gpu/drm/imx/ipuv3/imx-ldb.c           |  6 +-
 drivers/gpu/drm/imx/ipuv3/parallel-display.c  |  5 +-
 include/drm/bridge/imx.h                      | 17 ----
 include/drm/bridge/of-display-mode-bridge.h   | 17 ++++
 11 files changed, 129 insertions(+), 126 deletions(-)
 delete mode 100644 drivers/gpu/drm/bridge/imx/imx-legacy-bridge.c
 create mode 100644 drivers/gpu/drm/bridge/of-display-mode-bridge.c
 delete mode 100644 include/drm/bridge/imx.h
 create mode 100644 include/drm/bridge/of-display-mode-bridge.h

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 39385deafc68..6563d367cad8 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -251,6 +251,16 @@ config DRM_NXP_PTN3460
 	help
 	  NXP PTN3460 eDP-LVDS bridge chip driver.
 
+config DRM_OF_DISPLAY_MODE_BRIDGE
+	tristate
+	depends on DRM_BRIDGE && OF
+	help
+	  This is a DRM bridge implementation that uses of_get_drm_display_mode
+	  to acquire display mode.
+
+	  It exists for compatibility with legacy display mode parsing, in order
+	  to conform to the panel-bridge framework.
+
 config DRM_PARADE_PS8622
 	tristate "Parade eDP/LVDS bridge"
 	depends on OF
diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
index 909c21cc3acd..c54018a014d3 100644
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -21,6 +21,7 @@ obj-$(CONFIG_DRM_LVDS_CODEC) += lvds-codec.o
 obj-$(CONFIG_DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW) += megachips-stdpxxxx-ge-b850v3-fw.o
 obj-$(CONFIG_DRM_MICROCHIP_LVDS_SERIALIZER) += microchip-lvds.o
 obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
+obj-$(CONFIG_DRM_OF_DISPLAY_MODE_BRIDGE) += of-display-mode-bridge.o
 obj-$(CONFIG_DRM_PARADE_PS8622) += parade-ps8622.o
 obj-$(CONFIG_DRM_PARADE_PS8640) += parade-ps8640.o
 obj-$(CONFIG_DRM_SAMSUNG_DSIM) += samsung-dsim.o
diff --git a/drivers/gpu/drm/bridge/imx/Kconfig b/drivers/gpu/drm/bridge/imx/Kconfig
index b9028a5e5a06..8877b9789868 100644
--- a/drivers/gpu/drm/bridge/imx/Kconfig
+++ b/drivers/gpu/drm/bridge/imx/Kconfig
@@ -3,16 +3,6 @@ if ARCH_MXC || COMPILE_TEST
 config DRM_IMX_LDB_HELPER
 	tristate
 
-config DRM_IMX_LEGACY_BRIDGE
-	tristate
-	depends on DRM_IMX
-	help
-	  This is a DRM bridge implementation for the DRM i.MX IPUv3 driver,
-	  that uses of_get_drm_display_mode to acquire display mode.
-
-	  Newer designs should not use this bridge and should use proper panel
-	  driver instead.
-
 config DRM_IMX8MP_DW_HDMI_BRIDGE
 	tristate "Freescale i.MX8MP HDMI-TX bridge support"
 	depends on OF
diff --git a/drivers/gpu/drm/bridge/imx/Makefile b/drivers/gpu/drm/bridge/imx/Makefile
index 8d01fda25451..69d9f9abbe36 100644
--- a/drivers/gpu/drm/bridge/imx/Makefile
+++ b/drivers/gpu/drm/bridge/imx/Makefile
@@ -1,5 +1,4 @@
 obj-$(CONFIG_DRM_IMX_LDB_HELPER) += imx-ldb-helper.o
-obj-$(CONFIG_DRM_IMX_LEGACY_BRIDGE) += imx-legacy-bridge.o
 obj-$(CONFIG_DRM_IMX8MP_DW_HDMI_BRIDGE) += imx8mp-hdmi-tx.o
 obj-$(CONFIG_DRM_IMX8MP_HDMI_PAI) += imx8mp-hdmi-pai.o
 obj-$(CONFIG_DRM_IMX8MP_HDMI_PVI) += imx8mp-hdmi-pvi.o
diff --git a/drivers/gpu/drm/bridge/imx/imx-legacy-bridge.c b/drivers/gpu/drm/bridge/imx/imx-legacy-bridge.c
deleted file mode 100644
index 0e31d5000e7c..000000000000
--- a/drivers/gpu/drm/bridge/imx/imx-legacy-bridge.c
+++ /dev/null
@@ -1,91 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Freescale i.MX drm driver
- *
- * bridge driver for legacy DT bindings, utilizing display-timings node
- */
-
-#include <linux/export.h>
-
-#include <drm/drm_bridge.h>
-#include <drm/drm_modes.h>
-#include <drm/drm_probe_helper.h>
-#include <drm/bridge/imx.h>
-
-#include <video/of_display_timing.h>
-#include <video/of_videomode.h>
-
-struct imx_legacy_bridge {
-	struct drm_bridge base;
-
-	struct drm_display_mode mode;
-	u32 bus_flags;
-};
-
-#define to_imx_legacy_bridge(bridge)	container_of(bridge, struct imx_legacy_bridge, base)
-
-static int imx_legacy_bridge_attach(struct drm_bridge *bridge,
-				    struct drm_encoder *encoder,
-				    enum drm_bridge_attach_flags flags)
-{
-	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
-		return -EINVAL;
-
-	return 0;
-}
-
-static int imx_legacy_bridge_get_modes(struct drm_bridge *bridge,
-				       struct drm_connector *connector)
-{
-	struct imx_legacy_bridge *imx_bridge = to_imx_legacy_bridge(bridge);
-	int ret;
-
-	ret = drm_connector_helper_get_modes_fixed(connector, &imx_bridge->mode);
-	if (ret)
-		return ret;
-
-	connector->display_info.bus_flags = imx_bridge->bus_flags;
-
-	return 0;
-}
-
-struct drm_bridge_funcs imx_legacy_bridge_funcs = {
-	.attach = imx_legacy_bridge_attach,
-	.get_modes = imx_legacy_bridge_get_modes,
-};
-
-struct drm_bridge *devm_imx_drm_legacy_bridge(struct device *dev,
-					      struct device_node *np,
-					      int type)
-{
-	struct imx_legacy_bridge *imx_bridge;
-	int ret;
-
-	imx_bridge = devm_drm_bridge_alloc(dev, struct imx_legacy_bridge,
-					   base, &imx_legacy_bridge_funcs);
-	if (IS_ERR(imx_bridge))
-		return ERR_CAST(imx_bridge);
-
-	ret = of_get_drm_display_mode(np,
-				      &imx_bridge->mode,
-				      &imx_bridge->bus_flags,
-				      OF_USE_NATIVE_MODE);
-	if (ret)
-		return ERR_PTR(ret);
-
-	imx_bridge->mode.type |= DRM_MODE_TYPE_DRIVER;
-
-	imx_bridge->base.of_node = np;
-	imx_bridge->base.ops = DRM_BRIDGE_OP_MODES;
-	imx_bridge->base.type = type;
-
-	ret = devm_drm_bridge_add(dev, &imx_bridge->base);
-	if (ret)
-		return ERR_PTR(ret);
-
-	return &imx_bridge->base;
-}
-EXPORT_SYMBOL_GPL(devm_imx_drm_legacy_bridge);
-
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("Freescale i.MX DRM bridge driver for legacy DT bindings");
diff --git a/drivers/gpu/drm/bridge/of-display-mode-bridge.c b/drivers/gpu/drm/bridge/of-display-mode-bridge.c
new file mode 100644
index 000000000000..cb15713f3a79
--- /dev/null
+++ b/drivers/gpu/drm/bridge/of-display-mode-bridge.c
@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2012 Sascha Hauer, Pengutronix
+ *
+ * bridge driver for legacy DT bindings, utilizing display-timings node
+ *
+ * Author: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
+ */
+
+#include <linux/export.h>
+
+#include <drm/drm_bridge.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/bridge/of-display-mode-bridge.h>
+
+#include <video/of_display_timing.h>
+#include <video/of_videomode.h>
+
+struct of_display_mode_bridge {
+	struct drm_bridge base;
+
+	struct drm_display_mode mode;
+	u32 bus_flags;
+};
+
+#define to_of_display_mode_bridge(bridge) container_of(bridge, struct of_display_mode_bridge, base)
+
+static int of_display_mode_bridge_attach(struct drm_bridge *bridge,
+					 struct drm_encoder *encoder,
+					 enum drm_bridge_attach_flags flags)
+{
+	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
+		return -EINVAL;
+
+	return 0;
+}
+
+static int of_display_mode_bridge_get_modes(struct drm_bridge *bridge,
+					    struct drm_connector *connector)
+{
+	struct of_display_mode_bridge *of_bridge = to_of_display_mode_bridge(bridge);
+	int ret;
+
+	ret = drm_connector_helper_get_modes_fixed(connector, &of_bridge->mode);
+	if (ret)
+		return ret;
+
+	connector->display_info.bus_flags = of_bridge->bus_flags;
+
+	return 0;
+}
+
+struct drm_bridge_funcs of_display_mode_bridge_funcs = {
+	.attach = of_display_mode_bridge_attach,
+	.get_modes = of_display_mode_bridge_get_modes,
+};
+
+struct drm_bridge *devm_drm_of_display_mode_bridge(struct device *dev,
+						   struct device_node *np,
+						   int type)
+{
+	struct of_display_mode_bridge *of_bridge;
+	int ret;
+
+	of_bridge = devm_drm_bridge_alloc(dev, struct of_display_mode_bridge,
+					  base, &of_display_mode_bridge_funcs);
+	if (IS_ERR(of_bridge))
+		return ERR_CAST(of_bridge);
+
+	ret = of_get_drm_display_mode(np,
+				      &of_bridge->mode,
+				      &of_bridge->bus_flags,
+				      OF_USE_NATIVE_MODE);
+	if (ret)
+		return ERR_PTR(ret);
+
+	of_bridge->mode.type |= DRM_MODE_TYPE_DRIVER;
+
+	of_bridge->base.of_node = np;
+	of_bridge->base.ops = DRM_BRIDGE_OP_MODES;
+	of_bridge->base.type = type;
+
+	ret = devm_drm_bridge_add(dev, &of_bridge->base);
+	if (ret)
+		return ERR_PTR(ret);
+
+	return &of_bridge->base;
+}
+EXPORT_SYMBOL_GPL(devm_drm_of_display_mode_bridge);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("DRM bridge driver for legacy DT bindings");
diff --git a/drivers/gpu/drm/imx/ipuv3/Kconfig b/drivers/gpu/drm/imx/ipuv3/Kconfig
index acaf25089001..e98f8d35efaa 100644
--- a/drivers/gpu/drm/imx/ipuv3/Kconfig
+++ b/drivers/gpu/drm/imx/ipuv3/Kconfig
@@ -15,7 +15,7 @@ config DRM_IMX_PARALLEL_DISPLAY
 	depends on DRM_IMX
 	select DRM_BRIDGE
 	select DRM_BRIDGE_CONNECTOR
-	select DRM_IMX_LEGACY_BRIDGE
+	select DRM_OF_DISPLAY_MODE_BRIDGE
 	select DRM_PANEL_BRIDGE
 	select VIDEOMODE_HELPERS
 
@@ -36,7 +36,7 @@ config DRM_IMX_LDB
 	select DRM_BRIDGE
 	select DRM_BRIDGE_CONNECTOR
 	select DRM_PANEL_BRIDGE
-	select DRM_IMX_LEGACY_BRIDGE
+	select DRM_OF_DISPLAY_MODE_BRIDGE
 	help
 	  Choose this to enable the internal LVDS Display Bridge (LDB)
 	  found on i.MX53 and i.MX6 processors.
diff --git a/drivers/gpu/drm/imx/ipuv3/imx-ldb.c b/drivers/gpu/drm/imx/ipuv3/imx-ldb.c
index 626d410d9150..730caf883e83 100644
--- a/drivers/gpu/drm/imx/ipuv3/imx-ldb.c
+++ b/drivers/gpu/drm/imx/ipuv3/imx-ldb.c
@@ -28,7 +28,7 @@
 #include <drm/drm_print.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/drm_simple_kms_helper.h>
-#include <drm/bridge/imx.h>
+#include <drm/bridge/of-display-mode-bridge.h>
 
 #include "imx-drm.h"
 
@@ -605,8 +605,8 @@ static int imx_ldb_probe(struct platform_device *pdev)
 		 * checking the bus_format property.
 		 */
 		if (!channel->bridge) {
-			channel->bridge = devm_imx_drm_legacy_bridge(dev, child,
-								     DRM_MODE_CONNECTOR_LVDS);
+			channel->bridge = devm_drm_of_display_mode_bridge(dev, child,
+									  DRM_MODE_CONNECTOR_LVDS);
 			if (IS_ERR(channel->bridge)) {
 				ret = PTR_ERR(channel->bridge);
 				goto free_child;
diff --git a/drivers/gpu/drm/imx/ipuv3/parallel-display.c b/drivers/gpu/drm/imx/ipuv3/parallel-display.c
index 6fbf505d2801..1109cb1badcb 100644
--- a/drivers/gpu/drm/imx/ipuv3/parallel-display.c
+++ b/drivers/gpu/drm/imx/ipuv3/parallel-display.c
@@ -19,7 +19,7 @@
 #include <drm/drm_of.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/drm_simple_kms_helper.h>
-#include <drm/bridge/imx.h>
+#include <drm/bridge/of-display-mode-bridge.h>
 
 #include "imx-drm.h"
 
@@ -233,7 +233,8 @@ static int imx_pd_probe(struct platform_device *pdev)
 	/* port@1 is the output port */
 	imxpd->next_bridge = devm_drm_of_get_bridge(dev, np, 1, 0);
 	if (imxpd->next_bridge == ERR_PTR(-ENODEV))
-		imxpd->next_bridge = devm_imx_drm_legacy_bridge(dev, np, DRM_MODE_CONNECTOR_DPI);
+		imxpd->next_bridge = devm_drm_of_display_mode_bridge(dev, np,
+								     DRM_MODE_CONNECTOR_DPI);
 	if (IS_ERR(imxpd->next_bridge)) {
 		ret = PTR_ERR(imxpd->next_bridge);
 		return ret;
diff --git a/include/drm/bridge/imx.h b/include/drm/bridge/imx.h
deleted file mode 100644
index b93f719fe0e7..000000000000
--- a/include/drm/bridge/imx.h
+++ /dev/null
@@ -1,17 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Copyright (C) 2012 Sascha Hauer, Pengutronix
- */
-
-#ifndef DRM_IMX_BRIDGE_H
-#define DRM_IMX_BRIDGE_H
-
-struct device;
-struct device_node;
-struct drm_bridge;
-
-struct drm_bridge *devm_imx_drm_legacy_bridge(struct device *dev,
-					      struct device_node *np,
-					      int type);
-
-#endif
diff --git a/include/drm/bridge/of-display-mode-bridge.h b/include/drm/bridge/of-display-mode-bridge.h
new file mode 100644
index 000000000000..89fcfedf68d8
--- /dev/null
+++ b/include/drm/bridge/of-display-mode-bridge.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2012 Sascha Hauer, Pengutronix
+ */
+
+#ifndef DRM_OF_DISPLAY_MODE_BRIDGE_H
+#define DRM_OF_DISPLAY_MODE_BRIDGE_H
+
+struct device;
+struct device_node;
+struct drm_bridge;
+
+struct drm_bridge *devm_drm_of_display_mode_bridge(struct device *dev,
+						   struct device_node *np,
+						   int type);
+
+#endif
-- 
2.34.1

[PATCH v10 03/18] drm/exynos: exynos_dp: Remove &exynos_dp_device.ptn_bridge

[Damon Ding]

Use &analogix_dp_plat_data.bridge instead of &exynos_dp_device.ptn_bridge
directly.

Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de> (on rk3588)

------

Changes in v3:
- Fix the typographical error for &dp->plat_data.bridge.

Changes in v4:
- Rename the &analogix_dp_plat_data.bridge to
  &analogix_dp_plat_data.next_bridge.

Changes in v9:
- Add Reviewed-by and Tested-by tags.
---
 drivers/gpu/drm/exynos/exynos_dp.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_dp.c b/drivers/gpu/drm/exynos/exynos_dp.c
index 5bcf41e0bd04..f469ac5b3c2a 100644
--- a/drivers/gpu/drm/exynos/exynos_dp.c
+++ b/drivers/gpu/drm/exynos/exynos_dp.c
@@ -36,7 +36,6 @@
 struct exynos_dp_device {
 	struct drm_encoder         encoder;
 	struct drm_connector       *connector;
-	struct drm_bridge          *ptn_bridge;
 	struct drm_device          *drm_dev;
 	struct device              *dev;
 
@@ -106,8 +105,8 @@ static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
 	dp->connector = connector;
 
 	/* Pre-empt DP connector creation if there's a bridge */
-	if (dp->ptn_bridge) {
-		ret = drm_bridge_attach(&dp->encoder, dp->ptn_bridge, bridge,
+	if (plat_data->next_bridge) {
+		ret = drm_bridge_attach(&dp->encoder, plat_data->next_bridge, bridge,
 					0);
 		if (ret)
 			return ret;
@@ -155,7 +154,7 @@ static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
 
 	dp->drm_dev = drm_dev;
 
-	if (!dp->plat_data.panel && !dp->ptn_bridge) {
+	if (!dp->plat_data.panel && !dp->plat_data.next_bridge) {
 		ret = exynos_dp_dt_parse_panel(dp);
 		if (ret)
 			return ret;
@@ -232,6 +231,7 @@ static int exynos_dp_probe(struct platform_device *pdev)
 
 	/* The remote port can be either a panel or a bridge */
 	dp->plat_data.panel = panel;
+	dp->plat_data.next_bridge = bridge;
 	dp->plat_data.dev_type = EXYNOS_DP;
 	dp->plat_data.power_on = exynos_dp_poweron;
 	dp->plat_data.power_off = exynos_dp_poweroff;
@@ -239,8 +239,6 @@ static int exynos_dp_probe(struct platform_device *pdev)
 	dp->plat_data.get_modes = exynos_dp_get_modes;
 	dp->plat_data.skip_connector = !!bridge;
 
-	dp->ptn_bridge = bridge;
-
 out:
 	dp->adp = analogix_dp_probe(dev, &dp->plat_data);
 	if (IS_ERR(dp->adp))
-- 
2.34.1

[PATCH v10 04/18] drm/exynos: exynos_dp: Remove unused &exynos_dp_device.connector

[Damon Ding]

The &exynos_dp_device.connector is assigned in exynos_dp_bridge_attach()
but never used. It should make sense to remove it.

Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de> (on rk3588)

---

Changes in v5:
- Fix the 'drm/bridge' to 'drm/exynos' in commit message.

Changes in v9:
- Add Reviewed-by and Tested-by tags.
---
 drivers/gpu/drm/exynos/exynos_dp.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_dp.c b/drivers/gpu/drm/exynos/exynos_dp.c
index f469ac5b3c2a..e20513164032 100644
--- a/drivers/gpu/drm/exynos/exynos_dp.c
+++ b/drivers/gpu/drm/exynos/exynos_dp.c
@@ -35,7 +35,6 @@
 
 struct exynos_dp_device {
 	struct drm_encoder         encoder;
-	struct drm_connector       *connector;
 	struct drm_device          *drm_dev;
 	struct device              *dev;
 
@@ -102,8 +101,6 @@ static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
 	struct exynos_dp_device *dp = to_dp(plat_data);
 	int ret;
 
-	dp->connector = connector;
-
 	/* Pre-empt DP connector creation if there's a bridge */
 	if (plat_data->next_bridge) {
 		ret = drm_bridge_attach(&dp->encoder, plat_data->next_bridge, bridge,
-- 
2.34.1

[PATCH v10 05/18] drm/exynos: exynos_dp: Apply of-display-mode-bridge to parse the display-timings node

[Damon Ding]

If there is neither a panel nor a bridge, the display timing can be
parsed from the display-timings node under the dp node.

In order to get rid of &analogix_dp_plat_data.get_modes() and make
the codes more consistent, apply DRM of-display-mode-bridge to parse
display timings.

Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de> (on rk3588)

------

Changes in v6:
- Apply DRM legacy bridge to parse display timings instead of
  implementing the same codes only for Exynos DP.

Changes in v7:
- Use temporary flag &exynos_dp_device.has_of_bridge, which will be
  removed in the following patch, instead of applying API
  drm_bridge_is_legacy().
- Remove exynos_dp_legacy_bridge_init() and inline API
  devm_drm_of_display_mode_bridge().

Changes in v9:
- Add Tested-by tag.

Changes in v10:
- Add Reviewed-by tag.
---
 drivers/gpu/drm/exynos/Kconfig     |  1 +
 drivers/gpu/drm/exynos/exynos_dp.c | 66 ++++++++----------------------
 2 files changed, 17 insertions(+), 50 deletions(-)

diff --git a/drivers/gpu/drm/exynos/Kconfig b/drivers/gpu/drm/exynos/Kconfig
index 0d13828e7d9e..380d9a8ce259 100644
--- a/drivers/gpu/drm/exynos/Kconfig
+++ b/drivers/gpu/drm/exynos/Kconfig
@@ -72,6 +72,7 @@ config DRM_EXYNOS_DP
 	select DRM_ANALOGIX_DP
 	select DRM_DISPLAY_DP_HELPER
 	default DRM_EXYNOS
+	select DRM_OF_DISPLAY_MODE_BRIDGE
 	select DRM_PANEL
 	help
 	  This enables support for DP device.
diff --git a/drivers/gpu/drm/exynos/exynos_dp.c b/drivers/gpu/drm/exynos/exynos_dp.c
index e20513164032..ac16138a22fe 100644
--- a/drivers/gpu/drm/exynos/exynos_dp.c
+++ b/drivers/gpu/drm/exynos/exynos_dp.c
@@ -19,6 +19,7 @@
 #include <video/videomode.h>
 
 #include <drm/bridge/analogix_dp.h>
+#include <drm/bridge/of-display-mode-bridge.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
@@ -38,9 +39,10 @@ struct exynos_dp_device {
 	struct drm_device          *drm_dev;
 	struct device              *dev;
 
-	struct videomode           vm;
 	struct analogix_dp_device *adp;
 	struct analogix_dp_plat_data plat_data;
+
+	bool has_of_bridge;
 };
 
 static int exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data *plat_data,
@@ -67,44 +69,20 @@ static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data)
 	return exynos_dp_crtc_clock_enable(plat_data, false);
 }
 
-static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data,
-			       struct drm_connector *connector)
-{
-	struct exynos_dp_device *dp = to_dp(plat_data);
-	struct drm_display_mode *mode;
-
-	if (dp->plat_data.panel)
-		return 0;
-
-	mode = drm_mode_create(connector->dev);
-	if (!mode) {
-		DRM_DEV_ERROR(dp->dev,
-			      "failed to create a new display mode.\n");
-		return 0;
-	}
-
-	drm_display_mode_from_videomode(&dp->vm, mode);
-	connector->display_info.width_mm = mode->width_mm;
-	connector->display_info.height_mm = mode->height_mm;
-
-	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
-	drm_mode_set_name(mode);
-	drm_mode_probed_add(connector, mode);
-
-	return 1;
-}
-
 static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
 				   struct drm_bridge *bridge,
 				   struct drm_connector *connector)
 {
 	struct exynos_dp_device *dp = to_dp(plat_data);
+	enum drm_bridge_attach_flags flags = 0;
 	int ret;
 
 	/* Pre-empt DP connector creation if there's a bridge */
 	if (plat_data->next_bridge) {
-		ret = drm_bridge_attach(&dp->encoder, plat_data->next_bridge, bridge,
-					0);
+		if (dp->has_of_bridge)
+			flags = DRM_BRIDGE_ATTACH_NO_CONNECTOR;
+
+		ret = drm_bridge_attach(&dp->encoder, plat_data->next_bridge, bridge, flags);
 		if (ret)
 			return ret;
 	}
@@ -129,19 +107,6 @@ static const struct drm_encoder_helper_funcs exynos_dp_encoder_helper_funcs = {
 	.disable = exynos_dp_nop,
 };
 
-static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)
-{
-	int ret;
-
-	ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE);
-	if (ret) {
-		DRM_DEV_ERROR(dp->dev,
-			      "failed: of_get_videomode() : %d\n", ret);
-		return ret;
-	}
-	return 0;
-}
-
 static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
 {
 	struct exynos_dp_device *dp = dev_get_drvdata(dev);
@@ -151,12 +116,6 @@ static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
 
 	dp->drm_dev = drm_dev;
 
-	if (!dp->plat_data.panel && !dp->plat_data.next_bridge) {
-		ret = exynos_dp_dt_parse_panel(dp);
-		if (ret)
-			return ret;
-	}
-
 	drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);
 
 	drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs);
@@ -223,6 +182,14 @@ static int exynos_dp_probe(struct platform_device *pdev)
 	}
 
 	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge);
+	if (ret == -ENODEV) {
+		dp->plat_data.next_bridge = devm_drm_of_display_mode_bridge(dp->dev,
+									dp->dev->of_node,
+									DRM_MODE_CONNECTOR_eDP);
+		ret = IS_ERR(dp->plat_data.next_bridge) ? PTR_ERR(dp->plat_data.next_bridge) : 0;
+		if (!ret)
+			dp->has_of_bridge = true;
+	}
 	if (ret)
 		return ret;
 
@@ -233,7 +200,6 @@ static int exynos_dp_probe(struct platform_device *pdev)
 	dp->plat_data.power_on = exynos_dp_poweron;
 	dp->plat_data.power_off = exynos_dp_poweroff;
 	dp->plat_data.attach = exynos_dp_bridge_attach;
-	dp->plat_data.get_modes = exynos_dp_get_modes;
 	dp->plat_data.skip_connector = !!bridge;
 
 out:
-- 
2.34.1

[PATCH v10 06/18] drm/bridge: analogix_dp: Remove redundant &analogix_dp_plat_data.skip_connector

[Damon Ding]

The &analogix_dp_plat_data.skip_connector related check can be replaced
by &analogix_dp_plat_data.bridge.

Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de> (on rk3588)

------

Changes in v3:
- Squash the Exynos side commit and the Analogix side commit together.

Changes in v4:
- Rename the &analogix_dp_plat_data.bridge to
  &analogix_dp_plat_data.next_bridge.

Changes in v9:
- Add Tested-by tag.

Changes in v10:
- Add Reviewed-by tag.
---
 drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 2 +-
 drivers/gpu/drm/exynos/exynos_dp.c                 | 1 -
 include/drm/bridge/analogix_dp.h                   | 1 -
 3 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index 3caa47d31649..4606ecc3f480 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -959,7 +959,7 @@ static int analogix_dp_bridge_attach(struct drm_bridge *bridge,
 		return -EINVAL;
 	}
 
-	if (!dp->plat_data->skip_connector) {
+	if (!dp->plat_data->next_bridge) {
 		connector = &dp->connector;
 		connector->polled = DRM_CONNECTOR_POLL_HPD;
 
diff --git a/drivers/gpu/drm/exynos/exynos_dp.c b/drivers/gpu/drm/exynos/exynos_dp.c
index ac16138a22fe..1eeb0b15f99a 100644
--- a/drivers/gpu/drm/exynos/exynos_dp.c
+++ b/drivers/gpu/drm/exynos/exynos_dp.c
@@ -200,7 +200,6 @@ static int exynos_dp_probe(struct platform_device *pdev)
 	dp->plat_data.power_on = exynos_dp_poweron;
 	dp->plat_data.power_off = exynos_dp_poweroff;
 	dp->plat_data.attach = exynos_dp_bridge_attach;
-	dp->plat_data.skip_connector = !!bridge;
 
 out:
 	dp->adp = analogix_dp_probe(dev, &dp->plat_data);
diff --git a/include/drm/bridge/analogix_dp.h b/include/drm/bridge/analogix_dp.h
index 582357c20640..f06da105d8f2 100644
--- a/include/drm/bridge/analogix_dp.h
+++ b/include/drm/bridge/analogix_dp.h
@@ -30,7 +30,6 @@ struct analogix_dp_plat_data {
 	struct drm_bridge *next_bridge;
 	struct drm_encoder *encoder;
 	struct drm_connector *connector;
-	bool skip_connector;
 
 	int (*power_on)(struct analogix_dp_plat_data *);
 	int (*power_off)(struct analogix_dp_plat_data *);
-- 
2.34.1

[PATCH v10 07/18] drm/bridge: analogix_dp: Move the color format check to .atomic_check() for Rockchip platforms

[Damon Ding]

For Rockchip platforms, the YUV color formats are currently unsupported.
This compatibility check was previously implemented in
&analogix_dp_plat_data.get_modes().

Moving color format check to &drm_connector_helper_funcs.atomic_check()
would get rid of &analogix_dp_plat_data.get_modes() and be more
reasonable than before.

Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de> (on rk3588)

---

Changes in v9:
- Add Tested-by tag.
---
 .../gpu/drm/bridge/analogix/analogix_dp_core.c | 11 +++++++++++
 .../gpu/drm/rockchip/analogix_dp-rockchip.c    | 18 ------------------
 2 files changed, 11 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index 4606ecc3f480..5bf41b364aba 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -894,8 +894,19 @@ static int analogix_dp_atomic_check(struct drm_connector *connector,
 				    struct drm_atomic_state *state)
 {
 	struct analogix_dp_device *dp = to_dp(connector);
+	struct drm_display_info *di = &connector->display_info;
 	struct drm_connector_state *conn_state;
 	struct drm_crtc_state *crtc_state;
+	u32 mask = DRM_COLOR_FORMAT_YCBCR444 | DRM_COLOR_FORMAT_YCBCR422;
+
+	if (is_rockchip(dp->plat_data->dev_type)) {
+		if ((di->color_formats & mask)) {
+			DRM_DEBUG_KMS("Swapping display color format from YUV to RGB\n");
+			di->color_formats &= ~mask;
+			di->color_formats |= DRM_COLOR_FORMAT_RGB444;
+			di->bpc = 8;
+		}
+	}
 
 	conn_state = drm_atomic_get_new_connector_state(state, connector);
 	if (WARN_ON(!conn_state))
diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
index fdab71d51e2a..70fe5ae69e2e 100644
--- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
@@ -166,23 +166,6 @@ static int rockchip_dp_powerdown(struct analogix_dp_plat_data *plat_data)
 	return 0;
 }
 
-static int rockchip_dp_get_modes(struct analogix_dp_plat_data *plat_data,
-				 struct drm_connector *connector)
-{
-	struct drm_display_info *di = &connector->display_info;
-	/* VOP couldn't output YUV video format for eDP rightly */
-	u32 mask = DRM_COLOR_FORMAT_YCBCR444 | DRM_COLOR_FORMAT_YCBCR422;
-
-	if ((di->color_formats & mask)) {
-		DRM_DEBUG_KMS("Swapping display color format from YUV to RGB\n");
-		di->color_formats &= ~mask;
-		di->color_formats |= DRM_COLOR_FORMAT_RGB444;
-		di->bpc = 8;
-	}
-
-	return 0;
-}
-
 static bool
 rockchip_dp_drm_encoder_mode_fixup(struct drm_encoder *encoder,
 				   const struct drm_display_mode *mode,
@@ -481,7 +464,6 @@ static int rockchip_dp_probe(struct platform_device *pdev)
 	dp->plat_data.dev_type = dp->data->chip_type;
 	dp->plat_data.power_on = rockchip_dp_poweron;
 	dp->plat_data.power_off = rockchip_dp_powerdown;
-	dp->plat_data.get_modes = rockchip_dp_get_modes;
 
 	ret = rockchip_dp_of_probe(dp);
 	if (ret < 0)
-- 
2.34.1

[PATCH v10 08/18] drm/bridge: analogix_dp: Remove unused &analogix_dp_plat_data.get_modes()

[Damon Ding]

The callback &analogix_dp_plat_data.get_modes() is not implemented
by either Rockchip side or Exynos side.

Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de> (on rk3588)

---

Changes in v9:
- Add Tested-by tag.

Changes in v10:
- Add Reviewed-by tag.
---
 drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 3 ---
 include/drm/bridge/analogix_dp.h                   | 2 --
 2 files changed, 5 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index 5bf41b364aba..b0bc96693fdb 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -875,9 +875,6 @@ static int analogix_dp_get_modes(struct drm_connector *connector)
 		}
 	}
 
-	if (dp->plat_data->get_modes)
-		num_modes += dp->plat_data->get_modes(dp->plat_data, connector);
-
 	return num_modes;
 }
 
diff --git a/include/drm/bridge/analogix_dp.h b/include/drm/bridge/analogix_dp.h
index f06da105d8f2..3301392eda5f 100644
--- a/include/drm/bridge/analogix_dp.h
+++ b/include/drm/bridge/analogix_dp.h
@@ -35,8 +35,6 @@ struct analogix_dp_plat_data {
 	int (*power_off)(struct analogix_dp_plat_data *);
 	int (*attach)(struct analogix_dp_plat_data *, struct drm_bridge *,
 		      struct drm_connector *);
-	int (*get_modes)(struct analogix_dp_plat_data *,
-			 struct drm_connector *);
 };
 
 int analogix_dp_resume(struct analogix_dp_device *dp);
-- 
2.34.1

[PATCH v10 09/18] drm/bridge: analogix_dp: Remove unused struct drm_connector* for &analogix_dp_plat_data.attach()

[Damon Ding]

For both Rockchip and Exynos sides, the struct drm_connector* is
never used in callback &analogix_dp_plat_data.attach(). After
applying drm_bridge_connector helper, this parameter will no longer
be used at all.

Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
---
 drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 2 +-
 drivers/gpu/drm/exynos/exynos_dp.c                 | 3 +--
 include/drm/bridge/analogix_dp.h                   | 3 +--
 3 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index b0bc96693fdb..3efd910ea463 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -991,7 +991,7 @@ static int analogix_dp_bridge_attach(struct drm_bridge *bridge,
 	 * point after plat attached.
 	 */
 	if (dp->plat_data->attach) {
-		ret = dp->plat_data->attach(dp->plat_data, bridge, connector);
+		ret = dp->plat_data->attach(dp->plat_data, bridge);
 		if (ret) {
 			DRM_ERROR("Failed at platform attach func\n");
 			return ret;
diff --git a/drivers/gpu/drm/exynos/exynos_dp.c b/drivers/gpu/drm/exynos/exynos_dp.c
index 1eeb0b15f99a..71a00ee97782 100644
--- a/drivers/gpu/drm/exynos/exynos_dp.c
+++ b/drivers/gpu/drm/exynos/exynos_dp.c
@@ -70,8 +70,7 @@ static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data)
 }
 
 static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
-				   struct drm_bridge *bridge,
-				   struct drm_connector *connector)
+				   struct drm_bridge *bridge)
 {
 	struct exynos_dp_device *dp = to_dp(plat_data);
 	enum drm_bridge_attach_flags flags = 0;
diff --git a/include/drm/bridge/analogix_dp.h b/include/drm/bridge/analogix_dp.h
index 3301392eda5f..3428ffff24c5 100644
--- a/include/drm/bridge/analogix_dp.h
+++ b/include/drm/bridge/analogix_dp.h
@@ -33,8 +33,7 @@ struct analogix_dp_plat_data {
 
 	int (*power_on)(struct analogix_dp_plat_data *);
 	int (*power_off)(struct analogix_dp_plat_data *);
-	int (*attach)(struct analogix_dp_plat_data *, struct drm_bridge *,
-		      struct drm_connector *);
+	int (*attach)(struct analogix_dp_plat_data *, struct drm_bridge *);
 };
 
 int analogix_dp_resume(struct analogix_dp_device *dp);
-- 
2.34.1

[PATCH v10 10/18] drm/bridge: analogix_dp: Pass struct drm_atomic_state* for analogix_dp_bridge_mode_set()

[Damon Ding]

To avoid using &analogix_dp_device.connector for compatibility
with the bridge connector framework, get &drm_connector from
&drm_atomic_state instead.

Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
---
 drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index 3efd910ea463..7e42eb18313d 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -1095,14 +1095,21 @@ static int analogix_dp_set_bridge(struct analogix_dp_device *dp)
 }
 
 static void analogix_dp_bridge_mode_set(struct drm_bridge *bridge,
+					struct drm_atomic_state *state,
 					const struct drm_display_mode *mode)
 {
 	struct analogix_dp_device *dp = to_dp(bridge);
-	struct drm_display_info *display_info = &dp->connector.display_info;
 	struct video_info *video = &dp->video_info;
 	struct device_node *dp_node = dp->dev->of_node;
+	struct drm_connector *connector;
+	struct drm_display_info *display_info;
 	int vic;
 
+	connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
+	if (!connector)
+		return;
+	display_info = &connector->display_info;
+
 	/* Input video interlaces & hsync pol & vsync pol */
 	video->interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
 	video->v_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NVSYNC);
@@ -1186,7 +1193,7 @@ static void analogix_dp_bridge_atomic_enable(struct drm_bridge *bridge,
 	new_crtc_state = drm_atomic_get_new_crtc_state(old_state, crtc);
 	if (!new_crtc_state)
 		return;
-	analogix_dp_bridge_mode_set(bridge, &new_crtc_state->adjusted_mode);
+	analogix_dp_bridge_mode_set(bridge, old_state, &new_crtc_state->adjusted_mode);
 
 	old_crtc_state = drm_atomic_get_old_crtc_state(old_state, crtc);
 	/* Not a full enable, just disable PSR and continue */
-- 
2.34.1

[PATCH v10 11/18] drm/bridge: analogix_dp: Apply drm_bridge_connector helper

[Damon Ding]

Initialize bridge_connector for both Rockchip and Exynos encoder sides.
Then, make DRM_BRIDGE_ATTACH_NO_CONNECTOR mandatory for Analogix bridge
side, as the private &drm_connector is no longer created.

The previous &drm_connector_funcs and &drm_connector_helper_funcs APIs
are replaced by the corresponding &drm_bridge_funcs APIs:

analogix_dp_atomic_check() -> analogix_dp_bridge_atomic_check()
analogix_dp_detect()       -> analogix_dp_bridge_detect()
analogix_dp_get_modes()    -> analogix_dp_bridge_get_modes()
                              analogix_dp_bridge_edid_read()

Additionally, the compatibilities of Analogix DP bridge based on whether
the next bridge is a 'panel'. If it is, OP_MODES and OP_DETECT are
supported; If not (the next bridge is a 'monitor' or a bridge chip),
OP_EDID and OP_DETECT are supported.

The devm_drm_bridge_add() is placed in analogix_dp_bind() instead of
analogix_dp_probe(), because the type of next bridge (the panel, monitor
or bridge chip) can only be determined after the probe process has fully
completed.

Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de> (on rk3588)

------

Changes in v2:
- For &drm_bridge.ops, remove DRM_BRIDGE_OP_HPD and add
  DRM_BRIDGE_OP_EDID.
- Add analogix_dp_bridge_edid_read().
- Move &analogix_dp_plat_data.skip_connector deletion to the previous
  patches.

Changes in v3:
- Rebase with the new devm_drm_bridge_alloc() related commit
  48f05c3b4b70 ("drm/bridge: analogix_dp: Use devm_drm_bridge_alloc()
  API").
- Expand the commit message.
- Call drm_bridge_get_modes() in analogix_dp_bridge_get_modes() if the
  bridge is available.
- Remove unnecessary parameter struct drm_connector* for callback
  &analogix_dp_plat_data.attach.
- In order to decouple the connector driver and the bridge driver, move
  the bridge connector initilization to the Rockchip and Exynos sides.

Changes in v4:
- Expand analogix_dp_bridge_detect() parameters to &drm_bridge and
  &drm_connector.
- Rename the &analogix_dp_plat_data.bridge to
  &analogix_dp_plat_data.next_bridge.

Changes in v5:
- Set the flag fo drm_bridge_attach() to DRM_BRIDGE_ATTACH_NO_CONNECTOR
  for next bridge attachment of Exynos side.
- Distinguish the &drm_bridge->ops of Analogix bridge based on whether
  the downstream device is a panel, a bridge or neither.
- Remove the calls to &analogix_dp_plat_data.get_modes().

Changes in v6:
- Select DRM_BRIDGE_CONNECTOR for both Rockchip and Exynos sides.
- Remove unnecessary drm_bridge_get_modes() in
  analogix_dp_bridge_get_modes().
- Simplify analogix_dp_bridge_edid_read().
- If the next is a bridge, set DRM_BRIDGE_OP_DETECT and return
  connector_status_connected in analogix_dp_bridge_detect().
- Set flag DRM_BRIDGE_ATTACH_NO_CONNECTOR for bridge attachment while
  binding. Meanwhile, make DRM_BRIDGE_ATTACH_NO_CONNECTOR unsuppported
  in analogix_dp_bridge_attach().
- Simplify the check of bridge capabilities.

Changes in v7:
- Remove temporary flag &exynos_dp_device.has_of_bridge.

Change in v9
- Add Tested-by tag.

Change in v10:
- Split this commit into serval smaller ones.
- Simplify the commit message.
---
 .../drm/bridge/analogix/analogix_dp_core.c    | 135 +++++++-----------
 drivers/gpu/drm/exynos/exynos_dp.c            |  26 ++--
 .../gpu/drm/rockchip/analogix_dp-rockchip.c   |  11 +-
 3 files changed, 76 insertions(+), 96 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index 7e42eb18313d..81c6e81dd352 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -856,44 +856,32 @@ static int analogix_dp_disable_psr(struct analogix_dp_device *dp)
 	return analogix_dp_send_psr_spd(dp, &psr_vsc, true);
 }
 
-static int analogix_dp_get_modes(struct drm_connector *connector)
+static int analogix_dp_bridge_get_modes(struct drm_bridge *bridge, struct drm_connector *connector)
 {
-	struct analogix_dp_device *dp = to_dp(connector);
-	const struct drm_edid *drm_edid;
+	struct analogix_dp_device *dp = to_dp(bridge);
 	int num_modes = 0;
 
-	if (dp->plat_data->panel) {
+	if (dp->plat_data->panel)
 		num_modes += drm_panel_get_modes(dp->plat_data->panel, connector);
-	} else {
-		drm_edid = drm_edid_read_ddc(connector, &dp->aux.ddc);
-
-		drm_edid_connector_update(&dp->connector, drm_edid);
-
-		if (drm_edid) {
-			num_modes += drm_edid_connector_add_modes(&dp->connector);
-			drm_edid_free(drm_edid);
-		}
-	}
 
 	return num_modes;
 }
 
-static struct drm_encoder *
-analogix_dp_best_encoder(struct drm_connector *connector)
+static const struct drm_edid *analogix_dp_bridge_edid_read(struct drm_bridge *bridge,
+							   struct drm_connector *connector)
 {
-	struct analogix_dp_device *dp = to_dp(connector);
+	struct analogix_dp_device *dp = to_dp(bridge);
 
-	return dp->encoder;
+	return drm_edid_read_ddc(connector, &dp->aux.ddc);
 }
 
-
-static int analogix_dp_atomic_check(struct drm_connector *connector,
-				    struct drm_atomic_state *state)
+static int analogix_dp_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 analogix_dp_device *dp = to_dp(connector);
-	struct drm_display_info *di = &connector->display_info;
-	struct drm_connector_state *conn_state;
-	struct drm_crtc_state *crtc_state;
+	struct analogix_dp_device *dp = to_dp(bridge);
+	struct drm_display_info *di = &conn_state->connector->display_info;
 	u32 mask = DRM_COLOR_FORMAT_YCBCR444 | DRM_COLOR_FORMAT_YCBCR422;
 
 	if (is_rockchip(dp->plat_data->dev_type)) {
@@ -905,38 +893,21 @@ static int analogix_dp_atomic_check(struct drm_connector *connector,
 		}
 	}
 
-	conn_state = drm_atomic_get_new_connector_state(state, connector);
-	if (WARN_ON(!conn_state))
-		return -ENODEV;
-
 	conn_state->self_refresh_aware = true;
 
-	if (!conn_state->crtc)
-		return 0;
-
-	crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
-	if (!crtc_state)
-		return 0;
-
 	if (crtc_state->self_refresh_active && !dp->psr_supported)
 		return -EINVAL;
 
 	return 0;
 }
 
-static const struct drm_connector_helper_funcs analogix_dp_connector_helper_funcs = {
-	.get_modes = analogix_dp_get_modes,
-	.best_encoder = analogix_dp_best_encoder,
-	.atomic_check = analogix_dp_atomic_check,
-};
-
 static enum drm_connector_status
-analogix_dp_detect(struct drm_connector *connector, bool force)
+analogix_dp_bridge_detect(struct drm_bridge *bridge, struct drm_connector *connector)
 {
-	struct analogix_dp_device *dp = to_dp(connector);
+	struct analogix_dp_device *dp = to_dp(bridge);
 	enum drm_connector_status status = connector_status_disconnected;
 
-	if (dp->plat_data->panel)
+	if (dp->plat_data->panel || dp->plat_data->next_bridge)
 		return connector_status_connected;
 
 	if (!analogix_dp_detect_hpd(dp))
@@ -945,51 +916,18 @@ analogix_dp_detect(struct drm_connector *connector, bool force)
 	return status;
 }
 
-static const struct drm_connector_funcs analogix_dp_connector_funcs = {
-	.fill_modes = drm_helper_probe_single_connector_modes,
-	.detect = analogix_dp_detect,
-	.destroy = drm_connector_cleanup,
-	.reset = drm_atomic_helper_connector_reset,
-	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
-	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
-};
-
 static int analogix_dp_bridge_attach(struct drm_bridge *bridge,
 				     struct drm_encoder *encoder,
 				     enum drm_bridge_attach_flags flags)
 {
 	struct analogix_dp_device *dp = to_dp(bridge);
-	struct drm_connector *connector = NULL;
 	int ret = 0;
 
-	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
-		DRM_ERROR("Fix bridge driver to make connector optional!");
+	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
+		DRM_ERROR("Unsupported connector creation\n");
 		return -EINVAL;
 	}
 
-	if (!dp->plat_data->next_bridge) {
-		connector = &dp->connector;
-		connector->polled = DRM_CONNECTOR_POLL_HPD;
-
-		ret = drm_connector_init(dp->drm_dev, connector,
-					 &analogix_dp_connector_funcs,
-					 DRM_MODE_CONNECTOR_eDP);
-		if (ret) {
-			DRM_ERROR("Failed to initialize connector with drm\n");
-			return ret;
-		}
-
-		drm_connector_helper_add(connector,
-					 &analogix_dp_connector_helper_funcs);
-		drm_connector_attach_encoder(connector, encoder);
-	}
-
-	/*
-	 * NOTE: the connector registration is implemented in analogix
-	 * platform driver, that to say connector would be exist after
-	 * plat_data->attch return, that's why we record the connector
-	 * point after plat attached.
-	 */
 	if (dp->plat_data->attach) {
 		ret = dp->plat_data->attach(dp->plat_data, bridge);
 		if (ret) {
@@ -1309,7 +1247,11 @@ static const struct drm_bridge_funcs analogix_dp_bridge_funcs = {
 	.atomic_enable = analogix_dp_bridge_atomic_enable,
 	.atomic_disable = analogix_dp_bridge_atomic_disable,
 	.atomic_post_disable = analogix_dp_bridge_atomic_post_disable,
+	.atomic_check = analogix_dp_bridge_atomic_check,
 	.attach = analogix_dp_bridge_attach,
+	.get_modes = analogix_dp_bridge_get_modes,
+	.edid_read = analogix_dp_bridge_edid_read,
+	.detect = analogix_dp_bridge_detect,
 };
 
 static int analogix_dp_dt_parse_pdata(struct analogix_dp_device *dp)
@@ -1539,6 +1481,7 @@ EXPORT_SYMBOL_GPL(analogix_dp_resume);
 
 int analogix_dp_bind(struct analogix_dp_device *dp, struct drm_device *drm_dev)
 {
+	struct drm_bridge *bridge = &dp->bridge;
 	int ret;
 
 	dp->drm_dev = drm_dev;
@@ -1552,7 +1495,18 @@ int analogix_dp_bind(struct analogix_dp_device *dp, struct drm_device *drm_dev)
 		return ret;
 	}
 
-	ret = drm_bridge_attach(dp->encoder, &dp->bridge, NULL, 0);
+	if (dp->plat_data->panel)
+		bridge->ops = DRM_BRIDGE_OP_MODES | DRM_BRIDGE_OP_DETECT;
+	else
+		bridge->ops = DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_DETECT;
+
+	bridge->of_node = dp->dev->of_node;
+	bridge->type = DRM_MODE_CONNECTOR_eDP;
+	ret = devm_drm_bridge_add(dp->dev, &dp->bridge);
+	if (ret)
+		goto err_unregister_aux;
+
+	ret = drm_bridge_attach(dp->encoder, bridge, NULL, DRM_BRIDGE_ATTACH_NO_CONNECTOR);
 	if (ret) {
 		DRM_ERROR("failed to create bridge (%d)\n", ret);
 		goto err_unregister_aux;
@@ -1570,7 +1524,6 @@ EXPORT_SYMBOL_GPL(analogix_dp_bind);
 void analogix_dp_unbind(struct analogix_dp_device *dp)
 {
 	analogix_dp_bridge_disable(&dp->bridge);
-	dp->connector.funcs->destroy(&dp->connector);
 
 	drm_panel_unprepare(dp->plat_data->panel);
 
@@ -1580,7 +1533,8 @@ EXPORT_SYMBOL_GPL(analogix_dp_unbind);
 
 int analogix_dp_start_crc(struct drm_connector *connector)
 {
-	struct analogix_dp_device *dp = to_dp(connector);
+	struct analogix_dp_device *dp;
+	struct drm_bridge *bridge;
 
 	if (!connector->state->crtc) {
 		DRM_ERROR("Connector %s doesn't currently have a CRTC.\n",
@@ -1588,13 +1542,26 @@ int analogix_dp_start_crc(struct drm_connector *connector)
 		return -EINVAL;
 	}
 
+	bridge = drm_bridge_chain_get_first_bridge(connector->encoder);
+	if (bridge->type != DRM_MODE_CONNECTOR_eDP)
+		return -EINVAL;
+
+	dp = to_dp(bridge);
+
 	return drm_dp_start_crc(&dp->aux, connector->state->crtc);
 }
 EXPORT_SYMBOL_GPL(analogix_dp_start_crc);
 
 int analogix_dp_stop_crc(struct drm_connector *connector)
 {
-	struct analogix_dp_device *dp = to_dp(connector);
+	struct analogix_dp_device *dp;
+	struct drm_bridge *bridge;
+
+	bridge = drm_bridge_chain_get_first_bridge(connector->encoder);
+	if (bridge->type != DRM_MODE_CONNECTOR_eDP)
+		return -EINVAL;
+
+	dp = to_dp(bridge);
 
 	return drm_dp_stop_crc(&dp->aux);
 }
diff --git a/drivers/gpu/drm/exynos/exynos_dp.c b/drivers/gpu/drm/exynos/exynos_dp.c
index 71a00ee97782..478eaa6f3175 100644
--- a/drivers/gpu/drm/exynos/exynos_dp.c
+++ b/drivers/gpu/drm/exynos/exynos_dp.c
@@ -22,6 +22,7 @@
 #include <drm/bridge/of-display-mode-bridge.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_bridge.h>
+#include <drm/drm_bridge_connector.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_of.h>
 #include <drm/drm_panel.h>
@@ -41,8 +42,6 @@ struct exynos_dp_device {
 
 	struct analogix_dp_device *adp;
 	struct analogix_dp_plat_data plat_data;
-
-	bool has_of_bridge;
 };
 
 static int exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data *plat_data,
@@ -73,15 +72,12 @@ static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
 				   struct drm_bridge *bridge)
 {
 	struct exynos_dp_device *dp = to_dp(plat_data);
-	enum drm_bridge_attach_flags flags = 0;
 	int ret;
 
 	/* Pre-empt DP connector creation if there's a bridge */
 	if (plat_data->next_bridge) {
-		if (dp->has_of_bridge)
-			flags = DRM_BRIDGE_ATTACH_NO_CONNECTOR;
-
-		ret = drm_bridge_attach(&dp->encoder, plat_data->next_bridge, bridge, flags);
+		ret = drm_bridge_attach(&dp->encoder, plat_data->next_bridge, bridge,
+					DRM_BRIDGE_ATTACH_NO_CONNECTOR);
 		if (ret)
 			return ret;
 	}
@@ -111,6 +107,7 @@ static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
 	struct exynos_dp_device *dp = dev_get_drvdata(dev);
 	struct drm_encoder *encoder = &dp->encoder;
 	struct drm_device *drm_dev = data;
+	struct drm_connector *connector;
 	int ret;
 
 	dp->drm_dev = drm_dev;
@@ -126,10 +123,19 @@ static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
 	dp->plat_data.encoder = encoder;
 
 	ret = analogix_dp_bind(dp->adp, dp->drm_dev);
-	if (ret)
+	if (ret) {
 		dp->encoder.funcs->destroy(&dp->encoder);
+		return ret;
+	}
+
+	connector = drm_bridge_connector_init(dp->drm_dev, dp->plat_data.encoder);
+	if (IS_ERR(connector)) {
+		ret = PTR_ERR(connector);
+		dev_err(dp->dev, "Failed to initialize bridge_connector\n");
+		return ret;
+	}
 
-	return ret;
+	return drm_connector_attach_encoder(connector, dp->plat_data.encoder);
 }
 
 static void exynos_dp_unbind(struct device *dev, struct device *master,
@@ -186,8 +192,6 @@ static int exynos_dp_probe(struct platform_device *pdev)
 									dp->dev->of_node,
 									DRM_MODE_CONNECTOR_eDP);
 		ret = IS_ERR(dp->plat_data.next_bridge) ? PTR_ERR(dp->plat_data.next_bridge) : 0;
-		if (!ret)
-			dp->has_of_bridge = true;
 	}
 	if (ret)
 		return ret;
diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
index 70fe5ae69e2e..7fa17ba26c46 100644
--- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
@@ -25,6 +25,7 @@
 #include <drm/display/drm_dp_helper.h>
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge_connector.h>
 #include <drm/bridge/analogix_dp.h>
 #include <drm/drm_of.h>
 #include <drm/drm_panel.h>
@@ -369,6 +370,7 @@ static int rockchip_dp_bind(struct device *dev, struct device *master,
 {
 	struct rockchip_dp_device *dp = dev_get_drvdata(dev);
 	struct drm_device *drm_dev = data;
+	struct drm_connector *connector;
 	int ret;
 
 	dp->drm_dev = drm_dev;
@@ -388,7 +390,14 @@ static int rockchip_dp_bind(struct device *dev, struct device *master,
 	if (ret)
 		goto err_cleanup_encoder;
 
-	return 0;
+	connector = drm_bridge_connector_init(dp->drm_dev, dp->plat_data.encoder);
+	if (IS_ERR(connector)) {
+		ret = PTR_ERR(connector);
+		dev_err(dp->dev, "Failed to initialize bridge_connector\n");
+		goto err_cleanup_encoder;
+	}
+
+	return drm_connector_attach_encoder(connector, dp->plat_data.encoder);
 err_cleanup_encoder:
 	dp->encoder.encoder.funcs->destroy(&dp->encoder.encoder);
 	return ret;
-- 
2.34.1

[PATCH v10 12/18] drm/bridge: analogix_dp: Remove unnecessary &analogix_dp_device.connector

[Damon Ding]

After adapting to the bridge connector framework, the private
drm_connector is no longer required.

Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
---
 drivers/gpu/drm/bridge/analogix/analogix_dp_core.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
index 91b215c6a0cf..17347448c6b0 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
@@ -154,7 +154,6 @@ struct analogix_dp_device {
 	struct drm_encoder	*encoder;
 	struct device		*dev;
 	struct drm_device	*drm_dev;
-	struct drm_connector	connector;
 	struct drm_bridge	bridge;
 	struct drm_dp_aux	aux;
 	struct clk		*clock;
-- 
2.34.1

[PATCH v10 13/18] drm/bridge: analogix_dp: Add new API analogix_dp_finish_probe()

[Damon Ding]

Since the panel/bridge should logically be positioned behind the
Analogix bridge in the display pipeline, it makes sense to handle
the panel/bridge parsing on the Analogix side. Therefore, we add
a new API analogix_dp_finish_probe(), which combines the panel/bridge
parsing with component addition, to do it.

In order to process component binding right after the probe completes,
the &analogix_dp_plat_data.ops is newly added to pass &component_ops,
for which the &dp_aux_ep_device_with_data.done_probing() of DP AUX bus
only supports passing &drm_dp_aux.

Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de> (on rk3588)

---

Changes in v4:
- Rename the &analogix_dp_plat_data.bridge to
  &analogix_dp_plat_data.next_bridge.
- Remame API analogix_dp_find_panel_or_bridge() to
  analogix_dp_finish_probe().

Changes in v5:
- Select DRM_DISPLAY_DP_AUX_BUS for DRM_ANALOGIX_DP.

Changes in v9:
- Add Tested-by tag.

Changes in v10:
- Fix to use dev_err_probe() in analogix_dp_finish_probe().
- Expand the commit message.
---
 drivers/gpu/drm/bridge/analogix/Kconfig       |  1 +
 .../drm/bridge/analogix/analogix_dp_core.c    | 46 +++++++++++++++++++
 include/drm/bridge/analogix_dp.h              |  2 +
 3 files changed, 49 insertions(+)

diff --git a/drivers/gpu/drm/bridge/analogix/Kconfig b/drivers/gpu/drm/bridge/analogix/Kconfig
index 4846b2e9be7c..964122b5bd39 100644
--- a/drivers/gpu/drm/bridge/analogix/Kconfig
+++ b/drivers/gpu/drm/bridge/analogix/Kconfig
@@ -29,6 +29,7 @@ config DRM_ANALOGIX_ANX78XX
 config DRM_ANALOGIX_DP
 	tristate
 	depends on DRM
+	select DRM_DISPLAY_DP_AUX_BUS
 
 config DRM_ANALOGIX_ANX7625
 	tristate "Analogix Anx7625 MIPI to DP interface support"
diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index 81c6e81dd352..b112df52cabf 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -20,12 +20,14 @@
 #include <linux/platform_device.h>
 
 #include <drm/bridge/analogix_dp.h>
+#include <drm/display/drm_dp_aux_bus.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_edid.h>
+#include <drm/drm_of.h>
 #include <drm/drm_panel.h>
 #include <drm/drm_print.h>
 #include <drm/drm_probe_helper.h>
@@ -1581,6 +1583,50 @@ struct drm_dp_aux *analogix_dp_get_aux(struct analogix_dp_device *dp)
 }
 EXPORT_SYMBOL_GPL(analogix_dp_get_aux);
 
+static int analogix_dp_aux_done_probing(struct drm_dp_aux *aux)
+{
+	struct analogix_dp_device *dp = to_dp(aux);
+	struct analogix_dp_plat_data *plat_data = dp->plat_data;
+	int port = plat_data->dev_type == EXYNOS_DP ? 0 : 1;
+	int ret;
+
+	/*
+	 * If drm_of_find_panel_or_bridge() returns -ENODEV, there may be no valid panel
+	 * or bridge nodes. The driver should go on for the driver-free bridge or the DP
+	 * mode applications.
+	 */
+	ret = drm_of_find_panel_or_bridge(dp->dev->of_node, port, 0,
+					  &plat_data->panel, &plat_data->next_bridge);
+	if (ret && ret != -ENODEV)
+		return ret;
+
+	return component_add(dp->dev, plat_data->ops);
+}
+
+int analogix_dp_finish_probe(struct analogix_dp_device *dp)
+{
+	int ret;
+
+	ret = devm_of_dp_aux_populate_bus(&dp->aux, analogix_dp_aux_done_probing);
+	if (ret) {
+		/*
+		 * If devm_of_dp_aux_populate_bus() returns -ENODEV, the done_probing() will
+		 * not be called because there are no EP devices. Then the callback function
+		 * analogix_dp_aux_done_probing() will be called directly in order to support
+		 * the other valid DT configurations.
+		 *
+		 * NOTE: The devm_of_dp_aux_populate_bus() is allowed to return -EPROBE_DEFER.
+		 */
+		if (ret != -ENODEV)
+			return dev_err_probe(dp->dev, ret, "failed to populate aux bus\n");
+
+		return analogix_dp_aux_done_probing(&dp->aux);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(analogix_dp_finish_probe);
+
 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
 MODULE_DESCRIPTION("Analogix DP Core Driver");
 MODULE_LICENSE("GPL v2");
diff --git a/include/drm/bridge/analogix_dp.h b/include/drm/bridge/analogix_dp.h
index 3428ffff24c5..bae969dec63a 100644
--- a/include/drm/bridge/analogix_dp.h
+++ b/include/drm/bridge/analogix_dp.h
@@ -30,6 +30,7 @@ struct analogix_dp_plat_data {
 	struct drm_bridge *next_bridge;
 	struct drm_encoder *encoder;
 	struct drm_connector *connector;
+	const struct component_ops *ops;
 
 	int (*power_on)(struct analogix_dp_plat_data *);
 	int (*power_off)(struct analogix_dp_plat_data *);
@@ -49,5 +50,6 @@ int analogix_dp_stop_crc(struct drm_connector *connector);
 
 struct analogix_dp_plat_data *analogix_dp_aux_to_plat_data(struct drm_dp_aux *aux);
 struct drm_dp_aux *analogix_dp_get_aux(struct analogix_dp_device *dp);
+int analogix_dp_finish_probe(struct analogix_dp_device *dp);
 
 #endif /* _ANALOGIX_DP_H_ */
-- 
2.34.1

[PATCH v10 14/18] drm/rockchip: analogix_dp: Apply analogix_dp_finish_probe()

[Damon Ding]

Apply analogix_dp_finish_probe() in order to move the panel/bridge
parsing from Rockchip side to the Analogix side.

Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Tested-by: Heiko Stuebner <heiko@sntech.de> (on rk3588)

---

Changes in v4:
- Rename analogix_dp_find_panel_or_bridge() to
  analogix_dp_finish_probe().

Changes in v5:
- Remove DRM_DISPLAY_DP_AUX_BUS for ROCKCHIP_ANALOGIX_DP

Changes in v9:
- Add Tested-by tag.
---
 .../gpu/drm/rockchip/analogix_dp-rockchip.c   | 38 +------------------
 1 file changed, 2 insertions(+), 36 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
index 7fa17ba26c46..832e9766bef0 100644
--- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
@@ -21,14 +21,12 @@
 #include <video/of_videomode.h>
 #include <video/videomode.h>
 
-#include <drm/display/drm_dp_aux_bus.h>
 #include <drm/display/drm_dp_helper.h>
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_bridge_connector.h>
 #include <drm/bridge/analogix_dp.h>
 #include <drm/drm_of.h>
-#include <drm/drm_panel.h>
 #include <drm/drm_print.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/drm_simple_kms_helper.h>
@@ -417,24 +415,6 @@ static const struct component_ops rockchip_dp_component_ops = {
 	.unbind = rockchip_dp_unbind,
 };
 
-static int rockchip_dp_link_panel(struct drm_dp_aux *aux)
-{
-	struct analogix_dp_plat_data *plat_data = analogix_dp_aux_to_plat_data(aux);
-	struct rockchip_dp_device *dp = pdata_encoder_to_dp(plat_data);
-	int ret;
-
-	/*
-	 * If drm_of_find_panel_or_bridge() returns -ENODEV, there may be no valid panel
-	 * or bridge nodes. The driver should go on for the driver-free bridge or the DP
-	 * mode applications.
-	 */
-	ret = drm_of_find_panel_or_bridge(dp->dev->of_node, 1, 0, &plat_data->panel, NULL);
-	if (ret && ret != -ENODEV)
-		return ret;
-
-	return component_add(dp->dev, &rockchip_dp_component_ops);
-}
-
 static int rockchip_dp_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -473,6 +453,7 @@ static int rockchip_dp_probe(struct platform_device *pdev)
 	dp->plat_data.dev_type = dp->data->chip_type;
 	dp->plat_data.power_on = rockchip_dp_poweron;
 	dp->plat_data.power_off = rockchip_dp_powerdown;
+	dp->plat_data.ops = &rockchip_dp_component_ops;
 
 	ret = rockchip_dp_of_probe(dp);
 	if (ret < 0)
@@ -484,22 +465,7 @@ static int rockchip_dp_probe(struct platform_device *pdev)
 	if (IS_ERR(dp->adp))
 		return PTR_ERR(dp->adp);
 
-	ret = devm_of_dp_aux_populate_bus(analogix_dp_get_aux(dp->adp), rockchip_dp_link_panel);
-	if (ret) {
-		/*
-		 * If devm_of_dp_aux_populate_bus() returns -ENODEV, the done_probing() will not
-		 * be called because there are no EP devices. Then the rockchip_dp_link_panel()
-		 * will be called directly in order to support the other valid DT configurations.
-		 *
-		 * NOTE: The devm_of_dp_aux_populate_bus() is allowed to return -EPROBE_DEFER.
-		 */
-		if (ret != -ENODEV)
-			return dev_err_probe(dp->dev, ret, "failed to populate aux bus\n");
-
-		return rockchip_dp_link_panel(analogix_dp_get_aux(dp->adp));
-	}
-
-	return 0;
+	return analogix_dp_finish_probe(dp->adp);
 }
 
 static void rockchip_dp_remove(struct platform_device *pdev)
-- 
2.34.1

[PATCH v10 15/18] drm/exynos: exynos_dp: Apply analogix_dp_finish_probe()

[Damon Ding]

Apply analogix_dp_finish_probe() in order to move the panel/bridge
parsing from Exynos side to the Analogix side.

Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de> (on rk3588)

---

Changes in v4:
- Rename analogix_dp_find_panel_or_bridge() to
  analogix_dp_finish_probe().

Changes in v7:
- Remove exynos_dp_legacy_bridge_init() and inline API
  devm_drm_of_display_mode_bridge().
- If the panel or the next_bridge is parsed from DT, use ptr validity
  to check whether to call component_add() directly at the end of
  probing.

-Changes in v9:
- Add Tested-by tag.
---
 drivers/gpu/drm/exynos/exynos_dp.c | 19 ++++++++-----------
 1 file changed, 8 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_dp.c b/drivers/gpu/drm/exynos/exynos_dp.c
index 478eaa6f3175..6126820aad3b 100644
--- a/drivers/gpu/drm/exynos/exynos_dp.c
+++ b/drivers/gpu/drm/exynos/exynos_dp.c
@@ -157,9 +157,6 @@ static int exynos_dp_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct device_node *np;
 	struct exynos_dp_device *dp;
-	struct drm_panel *panel;
-	struct drm_bridge *bridge;
-	int ret;
 
 	dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
 			  GFP_KERNEL);
@@ -186,30 +183,30 @@ static int exynos_dp_probe(struct platform_device *pdev)
 		goto out;
 	}
 
-	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge);
-	if (ret == -ENODEV) {
+	if (of_get_display_timings(dev->of_node)) {
 		dp->plat_data.next_bridge = devm_drm_of_display_mode_bridge(dp->dev,
 									dp->dev->of_node,
 									DRM_MODE_CONNECTOR_eDP);
-		ret = IS_ERR(dp->plat_data.next_bridge) ? PTR_ERR(dp->plat_data.next_bridge) : 0;
+		if (IS_ERR(dp->plat_data.next_bridge))
+			return PTR_ERR(dp->plat_data.next_bridge);
 	}
-	if (ret)
-		return ret;
 
 	/* The remote port can be either a panel or a bridge */
-	dp->plat_data.panel = panel;
-	dp->plat_data.next_bridge = bridge;
 	dp->plat_data.dev_type = EXYNOS_DP;
 	dp->plat_data.power_on = exynos_dp_poweron;
 	dp->plat_data.power_off = exynos_dp_poweroff;
 	dp->plat_data.attach = exynos_dp_bridge_attach;
+	dp->plat_data.ops = &exynos_dp_ops;
 
 out:
 	dp->adp = analogix_dp_probe(dev, &dp->plat_data);
 	if (IS_ERR(dp->adp))
 		return PTR_ERR(dp->adp);
 
-	return component_add(&pdev->dev, &exynos_dp_ops);
+	if (dp->plat_data.panel || dp->plat_data.next_bridge)
+		return component_add(&pdev->dev, &exynos_dp_ops);
+	else
+		return analogix_dp_finish_probe(dp->adp);
 }
 
 static void exynos_dp_remove(struct platform_device *pdev)
-- 
2.34.1

[PATCH v10 16/18] drm/bridge: analogix_dp: Attach the next bridge in analogix_dp_bridge_attach()

[Damon Ding]

Uniformly, move the next bridge attachment to the Analogix side
rather than scattered on Rockchip and Exynos sides. It can also
help get rid of the callback &analogix_dp_plat_data.attach() and
make codes more concise.

Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de> (on rk3588)

------

Changes in v6:
- Move the next bridge attachment to the Analogix side rather than
  scattered on Rockchip and Exynos sides.

Changes in v9:
- Add Tested-by tag.
---
 .../gpu/drm/bridge/analogix/analogix_dp_core.c |  7 ++++---
 drivers/gpu/drm/exynos/exynos_dp.c             | 18 ------------------
 include/drm/bridge/analogix_dp.h               |  1 -
 3 files changed, 4 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index b112df52cabf..b66fd3062e41 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -930,10 +930,11 @@ static int analogix_dp_bridge_attach(struct drm_bridge *bridge,
 		return -EINVAL;
 	}
 
-	if (dp->plat_data->attach) {
-		ret = dp->plat_data->attach(dp->plat_data, bridge);
+	if (dp->plat_data->next_bridge) {
+		ret = drm_bridge_attach(dp->encoder, dp->plat_data->next_bridge, bridge,
+					DRM_BRIDGE_ATTACH_NO_CONNECTOR);
 		if (ret) {
-			DRM_ERROR("Failed at platform attach func\n");
+			dev_err(dp->dev, "failed to attach following panel or bridge (%d)\n", ret);
 			return ret;
 		}
 	}
diff --git a/drivers/gpu/drm/exynos/exynos_dp.c b/drivers/gpu/drm/exynos/exynos_dp.c
index 6126820aad3b..6884ea6d04eb 100644
--- a/drivers/gpu/drm/exynos/exynos_dp.c
+++ b/drivers/gpu/drm/exynos/exynos_dp.c
@@ -68,23 +68,6 @@ static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data)
 	return exynos_dp_crtc_clock_enable(plat_data, false);
 }
 
-static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
-				   struct drm_bridge *bridge)
-{
-	struct exynos_dp_device *dp = to_dp(plat_data);
-	int ret;
-
-	/* Pre-empt DP connector creation if there's a bridge */
-	if (plat_data->next_bridge) {
-		ret = drm_bridge_attach(&dp->encoder, plat_data->next_bridge, bridge,
-					DRM_BRIDGE_ATTACH_NO_CONNECTOR);
-		if (ret)
-			return ret;
-	}
-
-	return 0;
-}
-
 static void exynos_dp_mode_set(struct drm_encoder *encoder,
 			       struct drm_display_mode *mode,
 			       struct drm_display_mode *adjusted_mode)
@@ -195,7 +178,6 @@ static int exynos_dp_probe(struct platform_device *pdev)
 	dp->plat_data.dev_type = EXYNOS_DP;
 	dp->plat_data.power_on = exynos_dp_poweron;
 	dp->plat_data.power_off = exynos_dp_poweroff;
-	dp->plat_data.attach = exynos_dp_bridge_attach;
 	dp->plat_data.ops = &exynos_dp_ops;
 
 out:
diff --git a/include/drm/bridge/analogix_dp.h b/include/drm/bridge/analogix_dp.h
index bae969dec63a..854af692229b 100644
--- a/include/drm/bridge/analogix_dp.h
+++ b/include/drm/bridge/analogix_dp.h
@@ -34,7 +34,6 @@ struct analogix_dp_plat_data {
 
 	int (*power_on)(struct analogix_dp_plat_data *);
 	int (*power_off)(struct analogix_dp_plat_data *);
-	int (*attach)(struct analogix_dp_plat_data *, struct drm_bridge *);
 };
 
 int analogix_dp_resume(struct analogix_dp_device *dp);
-- 
2.34.1

[PATCH v10 17/18] drm/bridge: analogix_dp: Remove bridge disabing and panel unpreparing in analogix_dp_unbind()

[Damon Ding]

The analogix_dp_unbind() should be balanced with analogix_dp_bind().
There are no bridge enabling and panel preparing in analogix_dp_bind(),
so it should be reasonable to remove the bridge disabing and panel
unpreparing in analogix_dp_unbind().

Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de> (on rk3588)

-----

Changes in v9:
- Add Tested-by tag.
---
 drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index b66fd3062e41..8bb248e44c26 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -1526,10 +1526,6 @@ EXPORT_SYMBOL_GPL(analogix_dp_bind);
 
 void analogix_dp_unbind(struct analogix_dp_device *dp)
 {
-	analogix_dp_bridge_disable(&dp->bridge);
-
-	drm_panel_unprepare(dp->plat_data->panel);
-
 	drm_dp_aux_unregister(&dp->aux);
 }
 EXPORT_SYMBOL_GPL(analogix_dp_unbind);
-- 
2.34.1

[PATCH v10 18/18] drm/bridge: analogix_dp: Apply panel_bridge helper

[Damon Ding]

In order to unify the handling of the panel and bridge, apply
panel_bridge helpers for Analogix DP driver. With this patch, the
bridge support will also become available.

The following changes have ben made:
- Apply plane_bridge helper to wrap the panel as the bridge.
- Remove the explicit panel APIs calls, which can be replaced with
  the automic bridge APIs calls wrapped by the panel.
- Remove the unnecessary analogix_dp_bridge_get_modes().

Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de> (on rk3588)

---

Changes in v4:
- Rename the &analogix_dp_plat_data.bridge to
  &analogix_dp_plat_data.next_bridge.

Changes in v5:
- Move panel_bridge addition a little forward.
- Move next_bridge attachment from Analogix side to Rockchip/Exynos
  side.

Changes in v6
- Remove the unnecessary analogix_dp_bridge_get_modes().
- Not to set DRM_BRIDGE_OP_MODES if the next is a panel.
- Squash [PATCH v5 15/17]drm/bridge: analogix_dp: Remove panel
  disabling and enabling in analogix_dp_set_bridge() into this
  commit.
- Fix the &drm_bridge->ops to DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_DETECT.

Changes in v9:
- Add Tested-by tag.
---
 .../drm/bridge/analogix/analogix_dp_core.c    | 41 +++++--------------
 1 file changed, 11 insertions(+), 30 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index 8bb248e44c26..fe7158d9edde 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -749,9 +749,6 @@ static int analogix_dp_commit(struct analogix_dp_device *dp)
 {
 	int ret;
 
-	/* Keep the panel disabled while we configure video */
-	drm_panel_disable(dp->plat_data->panel);
-
 	ret = analogix_dp_train_link(dp);
 	if (ret) {
 		dev_err(dp->dev, "unable to do link train, ret=%d\n", ret);
@@ -771,9 +768,6 @@ static int analogix_dp_commit(struct analogix_dp_device *dp)
 		return ret;
 	}
 
-	/* Safe to enable the panel now */
-	drm_panel_enable(dp->plat_data->panel);
-
 	/* Check whether panel supports fast training */
 	ret = analogix_dp_fast_link_train_detection(dp);
 	if (ret)
@@ -858,17 +852,6 @@ static int analogix_dp_disable_psr(struct analogix_dp_device *dp)
 	return analogix_dp_send_psr_spd(dp, &psr_vsc, true);
 }
 
-static int analogix_dp_bridge_get_modes(struct drm_bridge *bridge, struct drm_connector *connector)
-{
-	struct analogix_dp_device *dp = to_dp(bridge);
-	int num_modes = 0;
-
-	if (dp->plat_data->panel)
-		num_modes += drm_panel_get_modes(dp->plat_data->panel, connector);
-
-	return num_modes;
-}
-
 static const struct drm_edid *analogix_dp_bridge_edid_read(struct drm_bridge *bridge,
 							   struct drm_connector *connector)
 {
@@ -909,7 +892,7 @@ analogix_dp_bridge_detect(struct drm_bridge *bridge, struct drm_connector *conne
 	struct analogix_dp_device *dp = to_dp(bridge);
 	enum drm_connector_status status = connector_status_disconnected;
 
-	if (dp->plat_data->panel || dp->plat_data->next_bridge)
+	if (dp->plat_data->next_bridge)
 		return connector_status_connected;
 
 	if (!analogix_dp_detect_hpd(dp))
@@ -995,8 +978,6 @@ static void analogix_dp_bridge_atomic_pre_enable(struct drm_bridge *bridge,
 	/* Don't touch the panel if we're coming back from PSR */
 	if (old_crtc_state && old_crtc_state->self_refresh_active)
 		return;
-
-	drm_panel_prepare(dp->plat_data->panel);
 }
 
 static int analogix_dp_set_bridge(struct analogix_dp_device *dp)
@@ -1168,16 +1149,12 @@ static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
 	if (dp->dpms_mode != DRM_MODE_DPMS_ON)
 		return;
 
-	drm_panel_disable(dp->plat_data->panel);
-
 	disable_irq(dp->irq);
 
 	analogix_dp_set_analog_power_down(dp, POWER_ALL, 1);
 
 	pm_runtime_put_sync(dp->dev);
 
-	drm_panel_unprepare(dp->plat_data->panel);
-
 	dp->fast_train_enable = false;
 	dp->psr_supported = false;
 	dp->dpms_mode = DRM_MODE_DPMS_OFF;
@@ -1252,7 +1229,6 @@ static const struct drm_bridge_funcs analogix_dp_bridge_funcs = {
 	.atomic_post_disable = analogix_dp_bridge_atomic_post_disable,
 	.atomic_check = analogix_dp_bridge_atomic_check,
 	.attach = analogix_dp_bridge_attach,
-	.get_modes = analogix_dp_bridge_get_modes,
 	.edid_read = analogix_dp_bridge_edid_read,
 	.detect = analogix_dp_bridge_detect,
 };
@@ -1498,17 +1474,22 @@ int analogix_dp_bind(struct analogix_dp_device *dp, struct drm_device *drm_dev)
 		return ret;
 	}
 
-	if (dp->plat_data->panel)
-		bridge->ops = DRM_BRIDGE_OP_MODES | DRM_BRIDGE_OP_DETECT;
-	else
-		bridge->ops = DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_DETECT;
-
+	bridge->ops = DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_DETECT;
 	bridge->of_node = dp->dev->of_node;
 	bridge->type = DRM_MODE_CONNECTOR_eDP;
 	ret = devm_drm_bridge_add(dp->dev, &dp->bridge);
 	if (ret)
 		goto err_unregister_aux;
 
+	if (dp->plat_data->panel) {
+		dp->plat_data->next_bridge = devm_drm_panel_bridge_add(dp->dev,
+								       dp->plat_data->panel);
+		if (IS_ERR(dp->plat_data->next_bridge)) {
+			ret = PTR_ERR(bridge);
+			goto err_unregister_aux;
+		}
+	}
+
 	ret = drm_bridge_attach(dp->encoder, bridge, NULL, DRM_BRIDGE_ATTACH_NO_CONNECTOR);
 	if (ret) {
 		DRM_ERROR("failed to create bridge (%d)\n", ret);
-- 
2.34.1

Re: [PATCH v10 02/18] drm/bridge: Move legacy bridge driver out of imx directory for multi-platform use

[Philipp Zabel]

On Di, 2026-03-10 at 09:24 +0800, Damon Ding wrote:
> As suggested by Dmitry, the DRM legacy bridge driver can be pulled
> out of imx/ subdir for multi-platform use. The driver is also renamed
> to make it more generic and suitable for platforms other than i.MX.
> 
> Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
> Suggested-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Tested-by: Heiko Stuebner <heiko@sntech.de> (on rk3588)

Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>

regards
Philipp

Re: [PATCH v10 11/18] drm/bridge: analogix_dp: Apply drm_bridge_connector helper

[Luca Ceresoli]

Hello Damon,

On Tue Mar 10, 2026 at 2:24 AM CET, Damon Ding wrote:
> Initialize bridge_connector for both Rockchip and Exynos encoder sides.
> Then, make DRM_BRIDGE_ATTACH_NO_CONNECTOR mandatory for Analogix bridge
> side, as the private &drm_connector is no longer created.
>
> The previous &drm_connector_funcs and &drm_connector_helper_funcs APIs
> are replaced by the corresponding &drm_bridge_funcs APIs:
>
> analogix_dp_atomic_check() -> analogix_dp_bridge_atomic_check()
> analogix_dp_detect()       -> analogix_dp_bridge_detect()
> analogix_dp_get_modes()    -> analogix_dp_bridge_get_modes()
>                               analogix_dp_bridge_edid_read()
>
> Additionally, the compatibilities of Analogix DP bridge based on whether
> the next bridge is a 'panel'. If it is, OP_MODES and OP_DETECT are
> supported; If not (the next bridge is a 'monitor' or a bridge chip),
> OP_EDID and OP_DETECT are supported.
>
> The devm_drm_bridge_add() is placed in analogix_dp_bind() instead of
> analogix_dp_probe(), because the type of next bridge (the panel, monitor
> or bridge chip) can only be determined after the probe process has fully
> completed.
>
> Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Tested-by: Heiko Stuebner <heiko@sntech.de> (on rk3588)

...

> @@ -73,15 +72,12 @@ static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
>  				   struct drm_bridge *bridge)
>  {
>  	struct exynos_dp_device *dp = to_dp(plat_data);
> -	enum drm_bridge_attach_flags flags = 0;
>  	int ret;
>
>  	/* Pre-empt DP connector creation if there's a bridge */
>  	if (plat_data->next_bridge) {
> -		if (dp->has_of_bridge)
> -			flags = DRM_BRIDGE_ATTACH_NO_CONNECTOR;
> -
> -		ret = drm_bridge_attach(&dp->encoder, plat_data->next_bridge, bridge, flags);
> +		ret = drm_bridge_attach(&dp->encoder, plat_data->next_bridge, bridge,
> +					DRM_BRIDGE_ATTACH_NO_CONNECTOR);

Should this be 'flags | DRM_BRIDGE_ATTACH_NO_CONNECTOR' to be future-proof?

Luca

--
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

Re: [PATCH v10 12/18] drm/bridge: analogix_dp: Remove unnecessary &analogix_dp_device.connector

[Luca Ceresoli]

On Tue Mar 10, 2026 at 2:24 AM CET, Damon Ding wrote:
> After adapting to the bridge connector framework, the private
> drm_connector is no longer required.
>
> Signed-off-by: Damon Ding <damon.ding@rock-chips.com>

This should be folded in the previous patch, where all usages of this field
are removed.

Luca

--
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

Re: [PATCH v10 17/18] drm/bridge: analogix_dp: Remove bridge disabing and panel unpreparing in analogix_dp_unbind()

[Luca Ceresoli]

On Tue Mar 10, 2026 at 3:00 AM CET, Damon Ding wrote:
> The analogix_dp_unbind() should be balanced with analogix_dp_bind().
> There are no bridge enabling and panel preparing in analogix_dp_bind(),
> so it should be reasonable to remove the bridge disabing and panel
> unpreparing in analogix_dp_unbind().
>
> Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Tested-by: Heiko Stuebner <heiko@sntech.de> (on rk3588)

Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>

--
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

Re: [PATCH v10 16/18] drm/bridge: analogix_dp: Attach the next bridge in analogix_dp_bridge_attach()

[Luca Ceresoli]

On Tue Mar 10, 2026 at 3:00 AM CET, Damon Ding wrote:
> Uniformly, move the next bridge attachment to the Analogix side
> rather than scattered on Rockchip and Exynos sides. It can also
> help get rid of the callback &analogix_dp_plat_data.attach() and
> make codes more concise.
>
> Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Tested-by: Heiko Stuebner <heiko@sntech.de> (on rk3588)

Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>

--
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

Re: [PATCH v10 09/18] drm/bridge: analogix_dp: Remove unused struct drm_connector* for &analogix_dp_plat_data.attach()

[Luca Ceresoli]

On Tue Mar 10, 2026 at 2:24 AM CET, Damon Ding wrote:
> For both Rockchip and Exynos sides, the struct drm_connector* is
> never used in callback &analogix_dp_plat_data.attach(). After
> applying drm_bridge_connector helper, this parameter will no longer
> be used at all.
>
> Signed-off-by: Damon Ding <damon.ding@rock-chips.com>

Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>

--
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

Re: [PATCH v10 12/18] drm/bridge: analogix_dp: Remove unnecessary &analogix_dp_device.connector

[Damon Ding]

Hi Luca,

On 3/14/2026 1:12 AM, Luca Ceresoli wrote:
> On Tue Mar 10, 2026 at 2:24 AM CET, Damon Ding wrote:
>> After adapting to the bridge connector framework, the private
>> drm_connector is no longer required.
>>
>> Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
> 
> This should be folded in the previous patch, where all usages of this field
> are removed.
> 

Will fix in v11.

Best regards,
Damon

Re: [PATCH v10 11/18] drm/bridge: analogix_dp: Apply drm_bridge_connector helper

[Damon Ding]

Hi Luca,

On 3/14/2026 1:10 AM, Luca Ceresoli wrote:
> Hello Damon,
> 
> On Tue Mar 10, 2026 at 2:24 AM CET, Damon Ding wrote:
>> Initialize bridge_connector for both Rockchip and Exynos encoder sides.
>> Then, make DRM_BRIDGE_ATTACH_NO_CONNECTOR mandatory for Analogix bridge
>> side, as the private &drm_connector is no longer created.
>>
>> The previous &drm_connector_funcs and &drm_connector_helper_funcs APIs
>> are replaced by the corresponding &drm_bridge_funcs APIs:
>>
>> analogix_dp_atomic_check() -> analogix_dp_bridge_atomic_check()
>> analogix_dp_detect()       -> analogix_dp_bridge_detect()
>> analogix_dp_get_modes()    -> analogix_dp_bridge_get_modes()
>>                                analogix_dp_bridge_edid_read()
>>
>> Additionally, the compatibilities of Analogix DP bridge based on whether
>> the next bridge is a 'panel'. If it is, OP_MODES and OP_DETECT are
>> supported; If not (the next bridge is a 'monitor' or a bridge chip),
>> OP_EDID and OP_DETECT are supported.
>>
>> The devm_drm_bridge_add() is placed in analogix_dp_bind() instead of
>> analogix_dp_probe(), because the type of next bridge (the panel, monitor
>> or bridge chip) can only be determined after the probe process has fully
>> completed.
>>
>> Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
>> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
>> Tested-by: Heiko Stuebner <heiko@sntech.de> (on rk3588)
> 
> ...
> 
>> @@ -73,15 +72,12 @@ static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
>>   				   struct drm_bridge *bridge)
>>   {
>>   	struct exynos_dp_device *dp = to_dp(plat_data);
>> -	enum drm_bridge_attach_flags flags = 0;
>>   	int ret;
>>
>>   	/* Pre-empt DP connector creation if there's a bridge */
>>   	if (plat_data->next_bridge) {
>> -		if (dp->has_of_bridge)
>> -			flags = DRM_BRIDGE_ATTACH_NO_CONNECTOR;
>> -
>> -		ret = drm_bridge_attach(&dp->encoder, plat_data->next_bridge, bridge, flags);
>> +		ret = drm_bridge_attach(&dp->encoder, plat_data->next_bridge, bridge,
>> +					DRM_BRIDGE_ATTACH_NO_CONNECTOR);
> 
> Should this be 'flags | DRM_BRIDGE_ATTACH_NO_CONNECTOR' to be future-proof?
> 

Aha, the exynos_dp_bridge_attach() and even 
&analogix_dp_plat_data.attach() have been removed in [PATCH v10 16/18] 
for consistency and simplification. Since the only bridge flag supported 
right now is DRM_BRIDGE_ATTACH_NO_CONNECTOR, let’s leave this as is for 
now. ;-)

Best regards,
Damon

Re: [PATCH v10 11/18] drm/bridge: analogix_dp: Apply drm_bridge_connector helper

[Luca Ceresoli]

On Mon Mar 16, 2026 at 4:17 AM CET, Damon Ding wrote:
> Hi Luca,
>
> On 3/14/2026 1:10 AM, Luca Ceresoli wrote:
>> Hello Damon,
>>
>> On Tue Mar 10, 2026 at 2:24 AM CET, Damon Ding wrote:
>>> Initialize bridge_connector for both Rockchip and Exynos encoder sides.
>>> Then, make DRM_BRIDGE_ATTACH_NO_CONNECTOR mandatory for Analogix bridge
>>> side, as the private &drm_connector is no longer created.
>>>
>>> The previous &drm_connector_funcs and &drm_connector_helper_funcs APIs
>>> are replaced by the corresponding &drm_bridge_funcs APIs:
>>>
>>> analogix_dp_atomic_check() -> analogix_dp_bridge_atomic_check()
>>> analogix_dp_detect()       -> analogix_dp_bridge_detect()
>>> analogix_dp_get_modes()    -> analogix_dp_bridge_get_modes()
>>>                                analogix_dp_bridge_edid_read()
>>>
>>> Additionally, the compatibilities of Analogix DP bridge based on whether
>>> the next bridge is a 'panel'. If it is, OP_MODES and OP_DETECT are
>>> supported; If not (the next bridge is a 'monitor' or a bridge chip),
>>> OP_EDID and OP_DETECT are supported.
>>>
>>> The devm_drm_bridge_add() is placed in analogix_dp_bind() instead of
>>> analogix_dp_probe(), because the type of next bridge (the panel, monitor
>>> or bridge chip) can only be determined after the probe process has fully
>>> completed.
>>>
>>> Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
>>> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
>>> Tested-by: Heiko Stuebner <heiko@sntech.de> (on rk3588)
>>
>> ...
>>
>>> @@ -73,15 +72,12 @@ static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
>>>   				   struct drm_bridge *bridge)
>>>   {
>>>   	struct exynos_dp_device *dp = to_dp(plat_data);
>>> -	enum drm_bridge_attach_flags flags = 0;
>>>   	int ret;
>>>
>>>   	/* Pre-empt DP connector creation if there's a bridge */
>>>   	if (plat_data->next_bridge) {
>>> -		if (dp->has_of_bridge)
>>> -			flags = DRM_BRIDGE_ATTACH_NO_CONNECTOR;
>>> -
>>> -		ret = drm_bridge_attach(&dp->encoder, plat_data->next_bridge, bridge, flags);
>>> +		ret = drm_bridge_attach(&dp->encoder, plat_data->next_bridge, bridge,
>>> +					DRM_BRIDGE_ATTACH_NO_CONNECTOR);
>>
>> Should this be 'flags | DRM_BRIDGE_ATTACH_NO_CONNECTOR' to be future-proof?
>>
>
> Aha, the exynos_dp_bridge_attach() and even
> &analogix_dp_plat_data.attach() have been removed in [PATCH v10 16/18]
> for consistency and simplification. Since the only bridge flag supported
> right now is DRM_BRIDGE_ATTACH_NO_CONNECTOR, let’s leave this as is for
> now. ;-)

As you are going to send v11, I'd do that change. It is the right thing do
to, it's cheap, and in case patches up to 11/18 but not (yet) up to 16/18
we avoid ending up with unoptimal code until patch 16/18 is applied.

Luca

--
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

Re: [PATCH v10 11/18] drm/bridge: analogix_dp: Apply drm_bridge_connector helper

[Damon Ding]

On 3/16/2026 7:39 PM, Luca Ceresoli wrote:
> On Mon Mar 16, 2026 at 4:17 AM CET, Damon Ding wrote:
>> Hi Luca,
>>
>> On 3/14/2026 1:10 AM, Luca Ceresoli wrote:
>>> Hello Damon,
>>>
>>> On Tue Mar 10, 2026 at 2:24 AM CET, Damon Ding wrote:
>>>> Initialize bridge_connector for both Rockchip and Exynos encoder sides.
>>>> Then, make DRM_BRIDGE_ATTACH_NO_CONNECTOR mandatory for Analogix bridge
>>>> side, as the private &drm_connector is no longer created.
>>>>
>>>> The previous &drm_connector_funcs and &drm_connector_helper_funcs APIs
>>>> are replaced by the corresponding &drm_bridge_funcs APIs:
>>>>
>>>> analogix_dp_atomic_check() -> analogix_dp_bridge_atomic_check()
>>>> analogix_dp_detect()       -> analogix_dp_bridge_detect()
>>>> analogix_dp_get_modes()    -> analogix_dp_bridge_get_modes()
>>>>                                 analogix_dp_bridge_edid_read()
>>>>
>>>> Additionally, the compatibilities of Analogix DP bridge based on whether
>>>> the next bridge is a 'panel'. If it is, OP_MODES and OP_DETECT are
>>>> supported; If not (the next bridge is a 'monitor' or a bridge chip),
>>>> OP_EDID and OP_DETECT are supported.
>>>>
>>>> The devm_drm_bridge_add() is placed in analogix_dp_bind() instead of
>>>> analogix_dp_probe(), because the type of next bridge (the panel, monitor
>>>> or bridge chip) can only be determined after the probe process has fully
>>>> completed.
>>>>
>>>> Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
>>>> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
>>>> Tested-by: Heiko Stuebner <heiko@sntech.de> (on rk3588)
>>>
>>> ...
>>>
>>>> @@ -73,15 +72,12 @@ static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
>>>>    				   struct drm_bridge *bridge)
>>>>    {
>>>>    	struct exynos_dp_device *dp = to_dp(plat_data);
>>>> -	enum drm_bridge_attach_flags flags = 0;
>>>>    	int ret;
>>>>
>>>>    	/* Pre-empt DP connector creation if there's a bridge */
>>>>    	if (plat_data->next_bridge) {
>>>> -		if (dp->has_of_bridge)
>>>> -			flags = DRM_BRIDGE_ATTACH_NO_CONNECTOR;
>>>> -
>>>> -		ret = drm_bridge_attach(&dp->encoder, plat_data->next_bridge, bridge, flags);
>>>> +		ret = drm_bridge_attach(&dp->encoder, plat_data->next_bridge, bridge,
>>>> +					DRM_BRIDGE_ATTACH_NO_CONNECTOR);
>>>
>>> Should this be 'flags | DRM_BRIDGE_ATTACH_NO_CONNECTOR' to be future-proof?
>>>
>>
>> Aha, the exynos_dp_bridge_attach() and even
>> &analogix_dp_plat_data.attach() have been removed in [PATCH v10 16/18]
>> for consistency and simplification. Since the only bridge flag supported
>> right now is DRM_BRIDGE_ATTACH_NO_CONNECTOR, let’s leave this as is for
>> now. ;-)
> 
> As you are going to send v11, I'd do that change. It is the right thing do
> to, it's cheap, and in case patches up to 11/18 but not (yet) up to 16/18
> we avoid ending up with unoptimal code until patch 16/18 is applied.
> 

Yes, I will fix this in v11.

Best regards,
Damon