[PATCH 1/3] drm/bridge: imx8mp-hdmi-tx: switch to bridge DRM_BRIDGE_ATTACH_NO_CONNECTOR

[PATCH 1/3] drm/bridge: imx8mp-hdmi-tx: switch to bridge DRM_BRIDGE_ATTACH_NO_CONNECTOR

[Marek Vasut]

The dw-hdmi output_port is set to 1 in order to look for a connector
next bridge in order to get DRM_BRIDGE_ATTACH_NO_CONNECTOR working.
The output_port set to 1 makes the DW HDMI driver core look up the
next bridge in DT, where the next bridge is often the hdmi-connector .

Similar to 0af5e0b41110 ("drm/meson: encoder_hdmi: switch to bridge DRM_BRIDGE_ATTACH_NO_CONNECTOR")

Signed-off-by: Marek Vasut <marex@denx.de>
---
Cc: Andrzej Hajda <andrzej.hajda@intel.com>
Cc: David Airlie <airlied@gmail.com>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Jernej Skrabec <jernej.skrabec@gmail.com>
Cc: Jonas Karlman <jonas@kwiboo.se>
Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc: Liu Ying <victor.liu@nxp.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Neil Armstrong <neil.armstrong@linaro.org>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Cc: Robert Foss <rfoss@kernel.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Simona Vetter <simona@ffwll.ch>
Cc: Stefan Agner <stefan@agner.ch>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: dri-devel@lists.freedesktop.org
Cc: imx@lists.linux.dev
Cc: linux-arm-kernel@lists.infradead.org
---
 drivers/gpu/drm/bridge/imx/Kconfig          | 1 +
 drivers/gpu/drm/bridge/imx/imx8mp-hdmi-tx.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/bridge/imx/Kconfig b/drivers/gpu/drm/bridge/imx/Kconfig
index 9a480c6abb856..d8e9fbf75edbb 100644
--- a/drivers/gpu/drm/bridge/imx/Kconfig
+++ b/drivers/gpu/drm/bridge/imx/Kconfig
@@ -27,6 +27,7 @@ config DRM_IMX8MP_DW_HDMI_BRIDGE
 config DRM_IMX8MP_HDMI_PVI
 	tristate "Freescale i.MX8MP HDMI PVI bridge support"
 	depends on OF
+	select DRM_DISPLAY_CONNECTOR
 	help
 	  Choose this to enable support for the internal HDMI TX Parallel
 	  Video Interface found on the Freescale i.MX8MP SoC.
diff --git a/drivers/gpu/drm/bridge/imx/imx8mp-hdmi-tx.c b/drivers/gpu/drm/bridge/imx/imx8mp-hdmi-tx.c
index 1e7a789ec2890..4ebae5ad072ad 100644
--- a/drivers/gpu/drm/bridge/imx/imx8mp-hdmi-tx.c
+++ b/drivers/gpu/drm/bridge/imx/imx8mp-hdmi-tx.c
@@ -101,6 +101,7 @@ static int imx8mp_dw_hdmi_probe(struct platform_device *pdev)
 	plat_data->phy_name = "SAMSUNG HDMI TX PHY";
 	plat_data->priv_data = hdmi;
 	plat_data->phy_force_vendor = true;
+	plat_data->output_port = 1;
 
 	hdmi->dw_hdmi = dw_hdmi_probe(pdev, plat_data);
 	if (IS_ERR(hdmi->dw_hdmi))
-- 
2.45.2

[PATCH 2/3] drm/lcdif: add DRM_BRIDGE_ATTACH_NO_CONNECTOR flag to drm_bridge_attach

[Marek Vasut]

Commit a25b988ff83f ("drm/bridge: Extend bridge API to disable connector creation")
added DRM_BRIDGE_ATTACH_NO_CONNECTOR bridge flag and all bridges handle
this flag in some way since then.
Newly added bridge drivers must no longer contain the connector creation and
will fail probing if this flag isn't set.

In order to be able to connect to those newly added bridges as well,
make use of drm_bridge_connector API and have the connector initialized
by the display controller.

Based on 2e87bf389e13 ("drm/rockchip: add DRM_BRIDGE_ATTACH_NO_CONNECTOR flag to drm_bridge_attach")

This makes LT9611 work with i.MX8M Plus.

Signed-off-by: Marek Vasut <marex@denx.de>
---
Cc: Andrzej Hajda <andrzej.hajda@intel.com>
Cc: David Airlie <airlied@gmail.com>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Jernej Skrabec <jernej.skrabec@gmail.com>
Cc: Jonas Karlman <jonas@kwiboo.se>
Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc: Liu Ying <victor.liu@nxp.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Neil Armstrong <neil.armstrong@linaro.org>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Cc: Robert Foss <rfoss@kernel.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Simona Vetter <simona@ffwll.ch>
Cc: Stefan Agner <stefan@agner.ch>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: dri-devel@lists.freedesktop.org
Cc: imx@lists.linux.dev
Cc: linux-arm-kernel@lists.infradead.org
---
 drivers/gpu/drm/mxsfb/Kconfig     |  1 +
 drivers/gpu/drm/mxsfb/lcdif_drv.c | 23 ++++++++++++++++++++++-
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mxsfb/Kconfig b/drivers/gpu/drm/mxsfb/Kconfig
index 264e74f455547..07fb6901996ae 100644
--- a/drivers/gpu/drm/mxsfb/Kconfig
+++ b/drivers/gpu/drm/mxsfb/Kconfig
@@ -30,6 +30,7 @@ config DRM_IMX_LCDIF
 	select DRM_CLIENT_SELECTION
 	select DRM_MXS
 	select DRM_KMS_HELPER
+	select DRM_BRIDGE_CONNECTOR
 	select DRM_GEM_DMA_HELPER
 	select DRM_PANEL
 	select DRM_PANEL_BRIDGE
diff --git a/drivers/gpu/drm/mxsfb/lcdif_drv.c b/drivers/gpu/drm/mxsfb/lcdif_drv.c
index 8ee00f59ca821..40dfbc3e6118e 100644
--- a/drivers/gpu/drm/mxsfb/lcdif_drv.c
+++ b/drivers/gpu/drm/mxsfb/lcdif_drv.c
@@ -17,6 +17,7 @@
 #include <drm/clients/drm_client_setup.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_bridge.h>
+#include <drm/drm_bridge_connector.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_encoder.h>
 #include <drm/drm_fbdev_dma.h>
@@ -48,6 +49,8 @@ static const struct drm_encoder_funcs lcdif_encoder_funcs = {
 static int lcdif_attach_bridge(struct lcdif_drm_private *lcdif)
 {
 	struct device *dev = lcdif->drm->dev;
+	struct drm_device *drm = lcdif->drm;
+	struct drm_connector *connector;
 	struct device_node *ep;
 	struct drm_bridge *bridge;
 	int ret;
@@ -97,13 +100,31 @@ static int lcdif_attach_bridge(struct lcdif_drm_private *lcdif)
 			return ret;
 		}
 
-		ret = drm_bridge_attach(encoder, bridge, NULL, 0);
+		ret = drm_bridge_attach(encoder, bridge, NULL,
+					DRM_BRIDGE_ATTACH_NO_CONNECTOR);
 		if (ret) {
 			of_node_put(ep);
 			return dev_err_probe(dev, ret,
 					     "Failed to attach bridge for endpoint%u\n",
 					     of_ep.id);
 		}
+
+		connector = drm_bridge_connector_init(drm, encoder);
+		if (IS_ERR(connector)) {
+			ret = PTR_ERR(connector);
+			dev_err_probe(drm->dev, ret,
+				      "Failed to initialize bridge connector: %pe\n",
+				      connector);
+			return ret;
+		}
+
+		ret = drm_connector_attach_encoder(connector, encoder);
+		if (ret < 0) {
+			dev_err_probe(drm->dev, ret,
+				      "Failed to attach encoder.\n");
+			drm_connector_cleanup(connector);
+			return ret;
+		}
 	}
 
 	return 0;
-- 
2.45.2

[PATCH 3/3] drm/mxsfb: add DRM_BRIDGE_ATTACH_NO_CONNECTOR flag to drm_bridge_attach

[Marek Vasut]

Commit a25b988ff83f ("drm/bridge: Extend bridge API to disable connector creation")
added DRM_BRIDGE_ATTACH_NO_CONNECTOR bridge flag and all bridges handle
this flag in some way since then.
Newly added bridge drivers must no longer contain the connector creation and
will fail probing if this flag isn't set.

In order to be able to connect to those newly added bridges as well,
make use of drm_bridge_connector API and have the connector initialized
by the display controller.

Based on 2e87bf389e13 ("drm/rockchip: add DRM_BRIDGE_ATTACH_NO_CONNECTOR flag to drm_bridge_attach")

This makes LT9611 work with i.MX8M Mini.

Signed-off-by: Marek Vasut <marex@denx.de>
---
Cc: Andrzej Hajda <andrzej.hajda@intel.com>
Cc: David Airlie <airlied@gmail.com>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Jernej Skrabec <jernej.skrabec@gmail.com>
Cc: Jonas Karlman <jonas@kwiboo.se>
Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc: Liu Ying <victor.liu@nxp.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Neil Armstrong <neil.armstrong@linaro.org>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Cc: Robert Foss <rfoss@kernel.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Simona Vetter <simona@ffwll.ch>
Cc: Stefan Agner <stefan@agner.ch>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: dri-devel@lists.freedesktop.org
Cc: imx@lists.linux.dev
Cc: linux-arm-kernel@lists.infradead.org
---
 drivers/gpu/drm/mxsfb/Kconfig     |  1 +
 drivers/gpu/drm/mxsfb/mxsfb_drv.c | 36 +++++++++++++++++++++----------
 drivers/gpu/drm/mxsfb/mxsfb_drv.h |  2 +-
 drivers/gpu/drm/mxsfb/mxsfb_kms.c |  6 +++---
 4 files changed, 30 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/mxsfb/Kconfig b/drivers/gpu/drm/mxsfb/Kconfig
index 07fb6901996ae..e67de148955b2 100644
--- a/drivers/gpu/drm/mxsfb/Kconfig
+++ b/drivers/gpu/drm/mxsfb/Kconfig
@@ -12,6 +12,7 @@ config DRM_MXSFB
 	select DRM_CLIENT_SELECTION
 	select DRM_MXS
 	select DRM_KMS_HELPER
+	select DRM_BRIDGE_CONNECTOR
 	select DRM_GEM_DMA_HELPER
 	select DRM_PANEL
 	select DRM_PANEL_BRIDGE
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
index 59020862cf65e..d034c21e186a4 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
@@ -20,6 +20,7 @@
 #include <drm/clients/drm_client_setup.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_bridge.h>
+#include <drm/drm_bridge_connector.h>
 #include <drm/drm_connector.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_fbdev_dma.h>
@@ -118,10 +119,10 @@ static const struct drm_mode_config_helper_funcs mxsfb_mode_config_helpers = {
 
 static int mxsfb_attach_bridge(struct mxsfb_drm_private *mxsfb)
 {
+	struct drm_connector *connector = &mxsfb->connector;
 	struct drm_device *drm = mxsfb->drm;
-	struct drm_connector_list_iter iter;
-	struct drm_panel *panel;
 	struct drm_bridge *bridge;
+	struct drm_panel *panel;
 	int ret;
 
 	ret = drm_of_find_panel_or_bridge(drm->dev->of_node, 0, 0, &panel,
@@ -139,21 +140,34 @@ static int mxsfb_attach_bridge(struct mxsfb_drm_private *mxsfb)
 	if (!bridge)
 		return -ENODEV;
 
-	ret = drm_bridge_attach(&mxsfb->encoder, bridge, NULL, 0);
+	ret = drm_bridge_attach(&mxsfb->encoder, bridge, NULL,
+				DRM_BRIDGE_ATTACH_NO_CONNECTOR);
 	if (ret)
 		return dev_err_probe(drm->dev, ret, "Failed to attach bridge\n");
 
-	mxsfb->bridge = bridge;
+	connector = drm_bridge_connector_init(drm, &mxsfb->encoder);
+	if (IS_ERR(connector)) {
+		ret = PTR_ERR(connector);
+		dev_err_probe(drm->dev, ret,
+			      "Failed to initialize bridge connector: %pe\n",
+			      connector);
+		return ret;
+	}
 
-	/*
-	 * Get hold of the connector. This is a bit of a hack, until the bridge
-	 * API gives us bus flags and formats.
-	 */
-	drm_connector_list_iter_begin(drm, &iter);
-	mxsfb->connector = drm_connector_list_iter_next(&iter);
-	drm_connector_list_iter_end(&iter);
+	ret = drm_connector_attach_encoder(connector, &mxsfb->encoder);
+	if (ret < 0) {
+		dev_err_probe(drm->dev, ret,
+			      "Failed to attach encoder.\n");
+		goto err_cleanup_connector;
+	}
+
+	mxsfb->bridge = bridge;
 
 	return 0;
+
+err_cleanup_connector:
+	drm_connector_cleanup(connector);
+	return ret;
 }
 
 static irqreturn_t mxsfb_irq_handler(int irq, void *data)
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.h b/drivers/gpu/drm/mxsfb/mxsfb_drv.h
index d160d921b25fc..7a24e96ab4263 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_drv.h
+++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.h
@@ -43,7 +43,7 @@ struct mxsfb_drm_private {
 	} planes;
 	struct drm_crtc			crtc;
 	struct drm_encoder		encoder;
-	struct drm_connector		*connector;
+	struct drm_connector		connector;
 	struct drm_bridge		*bridge;
 
 	bool				crc_active;
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_kms.c b/drivers/gpu/drm/mxsfb/mxsfb_kms.c
index 7ed2516b6de05..30584091e2aa8 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_kms.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_kms.c
@@ -281,7 +281,7 @@ static void mxsfb_crtc_mode_set_nofb(struct mxsfb_drm_private *mxsfb,
 {
 	struct drm_device *drm = mxsfb->crtc.dev;
 	struct drm_display_mode *m = &mxsfb->crtc.state->adjusted_mode;
-	u32 bus_flags = mxsfb->connector->display_info.bus_flags;
+	u32 bus_flags = mxsfb->connector.display_info.bus_flags;
 	int err;
 
 	if (mxsfb->bridge && mxsfb->bridge->timings)
@@ -378,8 +378,8 @@ static void mxsfb_crtc_atomic_enable(struct drm_crtc *crtc,
 	}
 
 	/* If there is no bridge, use bus format from connector */
-	if (!bus_format && mxsfb->connector->display_info.num_bus_formats)
-		bus_format = mxsfb->connector->display_info.bus_formats[0];
+	if (!bus_format && mxsfb->connector.display_info.num_bus_formats)
+		bus_format = mxsfb->connector.display_info.bus_formats[0];
 
 	/* If all else fails, default to RGB888_1X24 */
 	if (!bus_format)
-- 
2.45.2

Re: [PATCH 2/3] drm/lcdif: add DRM_BRIDGE_ATTACH_NO_CONNECTOR flag to drm_bridge_attach

[Dmitry Baryshkov]

On Tue, Dec 24, 2024 at 01:42:48AM +0100, Marek Vasut wrote:
> Commit a25b988ff83f ("drm/bridge: Extend bridge API to disable connector creation")
> added DRM_BRIDGE_ATTACH_NO_CONNECTOR bridge flag and all bridges handle
> this flag in some way since then.
> Newly added bridge drivers must no longer contain the connector creation and
> will fail probing if this flag isn't set.
> 
> In order to be able to connect to those newly added bridges as well,
> make use of drm_bridge_connector API and have the connector initialized
> by the display controller.
> 
> Based on 2e87bf389e13 ("drm/rockchip: add DRM_BRIDGE_ATTACH_NO_CONNECTOR flag to drm_bridge_attach")
> 
> This makes LT9611 work with i.MX8M Plus.
> 
> Signed-off-by: Marek Vasut <marex@denx.de>
> ---
> Cc: Andrzej Hajda <andrzej.hajda@intel.com>
> Cc: David Airlie <airlied@gmail.com>
> Cc: Fabio Estevam <festevam@gmail.com>
> Cc: Jernej Skrabec <jernej.skrabec@gmail.com>
> Cc: Jonas Karlman <jonas@kwiboo.se>
> Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
> Cc: Liu Ying <victor.liu@nxp.com>
> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Maxime Ripard <mripard@kernel.org>
> Cc: Neil Armstrong <neil.armstrong@linaro.org>
> Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
> Cc: Robert Foss <rfoss@kernel.org>
> Cc: Sascha Hauer <s.hauer@pengutronix.de>
> Cc: Shawn Guo <shawnguo@kernel.org>
> Cc: Simona Vetter <simona@ffwll.ch>
> Cc: Stefan Agner <stefan@agner.ch>
> Cc: Thomas Zimmermann <tzimmermann@suse.de>
> Cc: dri-devel@lists.freedesktop.org
> Cc: imx@lists.linux.dev
> Cc: linux-arm-kernel@lists.infradead.org
> ---
>  drivers/gpu/drm/mxsfb/Kconfig     |  1 +
>  drivers/gpu/drm/mxsfb/lcdif_drv.c | 23 ++++++++++++++++++++++-
>  2 files changed, 23 insertions(+), 1 deletion(-)

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

-- 
With best wishes
Dmitry

Re: [PATCH 3/3] drm/mxsfb: add DRM_BRIDGE_ATTACH_NO_CONNECTOR flag to drm_bridge_attach

[Dmitry Baryshkov]

On Tue, Dec 24, 2024 at 01:42:49AM +0100, Marek Vasut wrote:
> Commit a25b988ff83f ("drm/bridge: Extend bridge API to disable connector creation")
> added DRM_BRIDGE_ATTACH_NO_CONNECTOR bridge flag and all bridges handle
> this flag in some way since then.
> Newly added bridge drivers must no longer contain the connector creation and
> will fail probing if this flag isn't set.
> 
> In order to be able to connect to those newly added bridges as well,
> make use of drm_bridge_connector API and have the connector initialized
> by the display controller.
> 
> Based on 2e87bf389e13 ("drm/rockchip: add DRM_BRIDGE_ATTACH_NO_CONNECTOR flag to drm_bridge_attach")
> 
> This makes LT9611 work with i.MX8M Mini.
> 
> Signed-off-by: Marek Vasut <marex@denx.de>
> ---
> Cc: Andrzej Hajda <andrzej.hajda@intel.com>
> Cc: David Airlie <airlied@gmail.com>
> Cc: Fabio Estevam <festevam@gmail.com>
> Cc: Jernej Skrabec <jernej.skrabec@gmail.com>
> Cc: Jonas Karlman <jonas@kwiboo.se>
> Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
> Cc: Liu Ying <victor.liu@nxp.com>
> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Maxime Ripard <mripard@kernel.org>
> Cc: Neil Armstrong <neil.armstrong@linaro.org>
> Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
> Cc: Robert Foss <rfoss@kernel.org>
> Cc: Sascha Hauer <s.hauer@pengutronix.de>
> Cc: Shawn Guo <shawnguo@kernel.org>
> Cc: Simona Vetter <simona@ffwll.ch>
> Cc: Stefan Agner <stefan@agner.ch>
> Cc: Thomas Zimmermann <tzimmermann@suse.de>
> Cc: dri-devel@lists.freedesktop.org
> Cc: imx@lists.linux.dev
> Cc: linux-arm-kernel@lists.infradead.org
> ---
>  drivers/gpu/drm/mxsfb/Kconfig     |  1 +
>  drivers/gpu/drm/mxsfb/mxsfb_drv.c | 36 +++++++++++++++++++++----------
>  drivers/gpu/drm/mxsfb/mxsfb_drv.h |  2 +-
>  drivers/gpu/drm/mxsfb/mxsfb_kms.c |  6 +++---
>  4 files changed, 30 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mxsfb/Kconfig b/drivers/gpu/drm/mxsfb/Kconfig
> index 07fb6901996ae..e67de148955b2 100644
> --- a/drivers/gpu/drm/mxsfb/Kconfig
> +++ b/drivers/gpu/drm/mxsfb/Kconfig
> @@ -12,6 +12,7 @@ config DRM_MXSFB
>  	select DRM_CLIENT_SELECTION
>  	select DRM_MXS
>  	select DRM_KMS_HELPER
> +	select DRM_BRIDGE_CONNECTOR
>  	select DRM_GEM_DMA_HELPER
>  	select DRM_PANEL
>  	select DRM_PANEL_BRIDGE
> diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> index 59020862cf65e..d034c21e186a4 100644
> --- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> +++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> @@ -20,6 +20,7 @@
>  #include <drm/clients/drm_client_setup.h>
>  #include <drm/drm_atomic_helper.h>
>  #include <drm/drm_bridge.h>
> +#include <drm/drm_bridge_connector.h>
>  #include <drm/drm_connector.h>
>  #include <drm/drm_drv.h>
>  #include <drm/drm_fbdev_dma.h>
> @@ -118,10 +119,10 @@ static const struct drm_mode_config_helper_funcs mxsfb_mode_config_helpers = {
>  
>  static int mxsfb_attach_bridge(struct mxsfb_drm_private *mxsfb)
>  {
> +	struct drm_connector *connector = &mxsfb->connector;

Drop the initialisation, it is useless.

>  	struct drm_device *drm = mxsfb->drm;
> -	struct drm_connector_list_iter iter;
> -	struct drm_panel *panel;
>  	struct drm_bridge *bridge;
> +	struct drm_panel *panel;
>  	int ret;
>  
>  	ret = drm_of_find_panel_or_bridge(drm->dev->of_node, 0, 0, &panel,
> @@ -139,21 +140,34 @@ static int mxsfb_attach_bridge(struct mxsfb_drm_private *mxsfb)
>  	if (!bridge)
>  		return -ENODEV;
>  
> -	ret = drm_bridge_attach(&mxsfb->encoder, bridge, NULL, 0);
> +	ret = drm_bridge_attach(&mxsfb->encoder, bridge, NULL,
> +				DRM_BRIDGE_ATTACH_NO_CONNECTOR);
>  	if (ret)
>  		return dev_err_probe(drm->dev, ret, "Failed to attach bridge\n");
>  
> -	mxsfb->bridge = bridge;
> +	connector = drm_bridge_connector_init(drm, &mxsfb->encoder);
> +	if (IS_ERR(connector)) {
> +		ret = PTR_ERR(connector);
> +		dev_err_probe(drm->dev, ret,
> +			      "Failed to initialize bridge connector: %pe\n",
> +			      connector);
> +		return ret;
> +	}
>  
> -	/*
> -	 * Get hold of the connector. This is a bit of a hack, until the bridge
> -	 * API gives us bus flags and formats.
> -	 */
> -	drm_connector_list_iter_begin(drm, &iter);
> -	mxsfb->connector = drm_connector_list_iter_next(&iter);
> -	drm_connector_list_iter_end(&iter);
> +	ret = drm_connector_attach_encoder(connector, &mxsfb->encoder);
> +	if (ret < 0) {
> +		dev_err_probe(drm->dev, ret,
> +			      "Failed to attach encoder.\n");
> +		goto err_cleanup_connector;
> +	}
> +
> +	mxsfb->bridge = bridge;
>  
>  	return 0;
> +
> +err_cleanup_connector:
> +	drm_connector_cleanup(connector);
> +	return ret;
>  }
>  
>  static irqreturn_t mxsfb_irq_handler(int irq, void *data)
> diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.h b/drivers/gpu/drm/mxsfb/mxsfb_drv.h
> index d160d921b25fc..7a24e96ab4263 100644
> --- a/drivers/gpu/drm/mxsfb/mxsfb_drv.h
> +++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.h
> @@ -43,7 +43,7 @@ struct mxsfb_drm_private {
>  	} planes;
>  	struct drm_crtc			crtc;
>  	struct drm_encoder		encoder;
> -	struct drm_connector		*connector;
> +	struct drm_connector		connector;

This connector isn't getting used. How is this supposed to work? Store
the connector that you got from drm_bridge_connector_init() here
instead.

>  	struct drm_bridge		*bridge;
>  
>  	bool				crc_active;
> diff --git a/drivers/gpu/drm/mxsfb/mxsfb_kms.c b/drivers/gpu/drm/mxsfb/mxsfb_kms.c
> index 7ed2516b6de05..30584091e2aa8 100644
> --- a/drivers/gpu/drm/mxsfb/mxsfb_kms.c
> +++ b/drivers/gpu/drm/mxsfb/mxsfb_kms.c
> @@ -281,7 +281,7 @@ static void mxsfb_crtc_mode_set_nofb(struct mxsfb_drm_private *mxsfb,
>  {
>  	struct drm_device *drm = mxsfb->crtc.dev;
>  	struct drm_display_mode *m = &mxsfb->crtc.state->adjusted_mode;
> -	u32 bus_flags = mxsfb->connector->display_info.bus_flags;
> +	u32 bus_flags = mxsfb->connector.display_info.bus_flags;
>  	int err;
>  
>  	if (mxsfb->bridge && mxsfb->bridge->timings)
> @@ -378,8 +378,8 @@ static void mxsfb_crtc_atomic_enable(struct drm_crtc *crtc,
>  	}
>  
>  	/* If there is no bridge, use bus format from connector */
> -	if (!bus_format && mxsfb->connector->display_info.num_bus_formats)
> -		bus_format = mxsfb->connector->display_info.bus_formats[0];
> +	if (!bus_format && mxsfb->connector.display_info.num_bus_formats)
> +		bus_format = mxsfb->connector.display_info.bus_formats[0];
>  
>  	/* If all else fails, default to RGB888_1X24 */
>  	if (!bus_format)
> -- 
> 2.45.2
> 

-- 
With best wishes
Dmitry

Re: [PATCH 1/3] drm/bridge: imx8mp-hdmi-tx: switch to bridge DRM_BRIDGE_ATTACH_NO_CONNECTOR

[Dmitry Baryshkov]

On Tue, Dec 24, 2024 at 01:42:47AM +0100, Marek Vasut wrote:
> The dw-hdmi output_port is set to 1 in order to look for a connector
> next bridge in order to get DRM_BRIDGE_ATTACH_NO_CONNECTOR working.
> The output_port set to 1 makes the DW HDMI driver core look up the
> next bridge in DT, where the next bridge is often the hdmi-connector .

Just to note: currently this will prevent one from using CEC with that
HDMI connector. I have a WIP series which provides generic CEC helpers
similar to HDMI Connector and HDMI Audio, but to make it work with
dw-hdmi would require one to convert the bridge into using
DRM_BRIDGE_OP_HDMI.

> 
> Similar to 0af5e0b41110 ("drm/meson: encoder_hdmi: switch to bridge DRM_BRIDGE_ATTACH_NO_CONNECTOR")
> 
> Signed-off-by: Marek Vasut <marex@denx.de>
> ---
> Cc: Andrzej Hajda <andrzej.hajda@intel.com>
> Cc: David Airlie <airlied@gmail.com>
> Cc: Fabio Estevam <festevam@gmail.com>
> Cc: Jernej Skrabec <jernej.skrabec@gmail.com>
> Cc: Jonas Karlman <jonas@kwiboo.se>
> Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
> Cc: Liu Ying <victor.liu@nxp.com>
> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Maxime Ripard <mripard@kernel.org>
> Cc: Neil Armstrong <neil.armstrong@linaro.org>
> Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
> Cc: Robert Foss <rfoss@kernel.org>
> Cc: Sascha Hauer <s.hauer@pengutronix.de>
> Cc: Shawn Guo <shawnguo@kernel.org>
> Cc: Simona Vetter <simona@ffwll.ch>
> Cc: Stefan Agner <stefan@agner.ch>
> Cc: Thomas Zimmermann <tzimmermann@suse.de>
> Cc: dri-devel@lists.freedesktop.org
> Cc: imx@lists.linux.dev
> Cc: linux-arm-kernel@lists.infradead.org
> ---
>  drivers/gpu/drm/bridge/imx/Kconfig          | 1 +
>  drivers/gpu/drm/bridge/imx/imx8mp-hdmi-tx.c | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/bridge/imx/Kconfig b/drivers/gpu/drm/bridge/imx/Kconfig
> index 9a480c6abb856..d8e9fbf75edbb 100644
> --- a/drivers/gpu/drm/bridge/imx/Kconfig
> +++ b/drivers/gpu/drm/bridge/imx/Kconfig
> @@ -27,6 +27,7 @@ config DRM_IMX8MP_DW_HDMI_BRIDGE
>  config DRM_IMX8MP_HDMI_PVI
>  	tristate "Freescale i.MX8MP HDMI PVI bridge support"
>  	depends on OF
> +	select DRM_DISPLAY_CONNECTOR
>  	help
>  	  Choose this to enable support for the internal HDMI TX Parallel
>  	  Video Interface found on the Freescale i.MX8MP SoC.
> diff --git a/drivers/gpu/drm/bridge/imx/imx8mp-hdmi-tx.c b/drivers/gpu/drm/bridge/imx/imx8mp-hdmi-tx.c
> index 1e7a789ec2890..4ebae5ad072ad 100644
> --- a/drivers/gpu/drm/bridge/imx/imx8mp-hdmi-tx.c
> +++ b/drivers/gpu/drm/bridge/imx/imx8mp-hdmi-tx.c
> @@ -101,6 +101,7 @@ static int imx8mp_dw_hdmi_probe(struct platform_device *pdev)
>  	plat_data->phy_name = "SAMSUNG HDMI TX PHY";
>  	plat_data->priv_data = hdmi;
>  	plat_data->phy_force_vendor = true;
> +	plat_data->output_port = 1;
>  
>  	hdmi->dw_hdmi = dw_hdmi_probe(pdev, plat_data);
>  	if (IS_ERR(hdmi->dw_hdmi))
> -- 
> 2.45.2
> 

-- 
With best wishes
Dmitry

Re: [PATCH 2/3] drm/lcdif: add DRM_BRIDGE_ATTACH_NO_CONNECTOR flag to drm_bridge_attach

[Dmitry Baryshkov]

On Tue, Dec 24, 2024 at 01:42:48AM +0100, Marek Vasut wrote:
> Commit a25b988ff83f ("drm/bridge: Extend bridge API to disable connector creation")
> added DRM_BRIDGE_ATTACH_NO_CONNECTOR bridge flag and all bridges handle
> this flag in some way since then.
> Newly added bridge drivers must no longer contain the connector creation and
> will fail probing if this flag isn't set.
> 
> In order to be able to connect to those newly added bridges as well,
> make use of drm_bridge_connector API and have the connector initialized
> by the display controller.
> 
> Based on 2e87bf389e13 ("drm/rockchip: add DRM_BRIDGE_ATTACH_NO_CONNECTOR flag to drm_bridge_attach")
> 
> This makes LT9611 work with i.MX8M Plus.
> 
> Signed-off-by: Marek Vasut <marex@denx.de>
> ---
> Cc: Andrzej Hajda <andrzej.hajda@intel.com>
> Cc: David Airlie <airlied@gmail.com>
> Cc: Fabio Estevam <festevam@gmail.com>
> Cc: Jernej Skrabec <jernej.skrabec@gmail.com>
> Cc: Jonas Karlman <jonas@kwiboo.se>
> Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
> Cc: Liu Ying <victor.liu@nxp.com>
> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Maxime Ripard <mripard@kernel.org>
> Cc: Neil Armstrong <neil.armstrong@linaro.org>
> Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
> Cc: Robert Foss <rfoss@kernel.org>
> Cc: Sascha Hauer <s.hauer@pengutronix.de>
> Cc: Shawn Guo <shawnguo@kernel.org>
> Cc: Simona Vetter <simona@ffwll.ch>
> Cc: Stefan Agner <stefan@agner.ch>
> Cc: Thomas Zimmermann <tzimmermann@suse.de>
> Cc: dri-devel@lists.freedesktop.org
> Cc: imx@lists.linux.dev
> Cc: linux-arm-kernel@lists.infradead.org
> ---
>  drivers/gpu/drm/mxsfb/Kconfig     |  1 +
>  drivers/gpu/drm/mxsfb/lcdif_drv.c | 23 ++++++++++++++++++++++-
>  2 files changed, 23 insertions(+), 1 deletion(-)

Also please note the series at [1]. Since that time we got ycbcr420
handled properly, but handling the HDR should require DRM_BRIDGE_OP_HDMI
at least.

[1] https://lore.kernel.org/dri-devel/20241018064813.2750016-1-victor.liu@nxp.com/

-- 
With best wishes
Dmitry