linux-kernel - Re: [PATCH 5/5] drm: lcdif: Use drm_bridge

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Message-ID: <2486359.jE0xQCEvom@steina-w>
Date: Fri, 18 Oct 2024 09:35:32 +0200
From: Alexander Stein <alexander.stein@...tq-group.com>
To: devicetree@...r.kernel.org, imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Cc: robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com, andrzej.hajda@...el.com, neil.armstrong@...aro.org, rfoss@...nel.org, Laurent.pinchart@...asonboard.com, jonas@...boo.se, jernej.skrabec@...il.com, maarten.lankhorst@...ux.intel.com, mripard@...nel.org, tzimmermann@...e.de, airlied@...il.com, simona@...ll.ch, marex@...x.de, stefan@...er.ch, dmitry.baryshkov@...aro.org, Liu Ying <victor.liu@....com>
Subject: Re: [PATCH 5/5] drm: lcdif: Use drm_bridge_connector

Hi,

Am Freitag, 18. Oktober 2024, 08:48:13 CEST schrieb Liu Ying:
> Initialize a connector by calling drm_bridge_connector_init() for
> each encoder so that down stream bridge drivers don't need to create
> connectors any more.
> 
> Signed-off-by: Liu Ying <victor.liu@....com>

I've tested this using HDMI output. HPD and CEC is still working.
Also output using a DSI->DP bridge (tc358767) also works.
My platform: imx8mp-tqma8mpql-mba8mpxl.dts

Tested-by: Alexander Stein <alexander.stein@...tq-group.com>
> ---
>  drivers/gpu/drm/mxsfb/Kconfig     |  1 +
>  drivers/gpu/drm/mxsfb/lcdif_drv.c | 17 ++++++++++++++++-
>  2 files changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/mxsfb/Kconfig b/drivers/gpu/drm/mxsfb/Kconfig
> index 264e74f45554..06c95e556380 100644
> --- a/drivers/gpu/drm/mxsfb/Kconfig
> +++ b/drivers/gpu/drm/mxsfb/Kconfig
> @@ -27,6 +27,7 @@ config DRM_IMX_LCDIF
>  	depends on DRM && OF
>  	depends on COMMON_CLK
>  	depends on ARCH_MXC || COMPILE_TEST
> +	select DRM_BRIDGE_CONNECTOR
>  	select DRM_CLIENT_SELECTION
>  	select DRM_MXS
>  	select DRM_KMS_HELPER
> diff --git a/drivers/gpu/drm/mxsfb/lcdif_drv.c b/drivers/gpu/drm/mxsfb/lcdif_drv.c
> index 58ccad9c425d..d4521da6675e 100644
> --- a/drivers/gpu/drm/mxsfb/lcdif_drv.c
> +++ b/drivers/gpu/drm/mxsfb/lcdif_drv.c
> @@ -16,7 +16,9 @@
>  
>  #include <drm/drm_atomic_helper.h>
>  #include <drm/drm_bridge.h>
> +#include <drm/drm_bridge_connector.h>
>  #include <drm/drm_client_setup.h>
> +#include <drm/drm_connector.h>
>  #include <drm/drm_drv.h>
>  #include <drm/drm_encoder.h>
>  #include <drm/drm_fbdev_dma.h>
> @@ -56,6 +58,7 @@ static int lcdif_attach_bridge(struct lcdif_drm_private *lcdif)
>  		struct device_node *remote;
>  		struct of_endpoint of_ep;
>  		struct drm_encoder *encoder;
> +		struct drm_connector *connector;
>  
>  		remote = of_graph_get_remote_port_parent(ep);
>  		if (!of_device_is_available(remote)) {
> @@ -97,13 +100,25 @@ 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(lcdif->drm, encoder);
> +		if (IS_ERR(connector)) {
> +			ret = PTR_ERR(connector);
> +			dev_err(dev, "Failed to initialize bridge connector: %d\n",
> +				ret);
> +			of_node_put(ep);
> +			return ret;
> +		}
> +
> +		drm_connector_attach_encoder(connector, encoder);
>  	}
>  
>  	return 0;
> 


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