linux-kernel - Re: [PATCH] drm/bridge: imx: Remove redundant checks on existence of bridge->encoder

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Date: Mon, 13 May 2024 00:17:09 +0300
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Sui Jingfeng <sui.jingfeng@...ux.dev>
Cc: Liu Ying <victor.liu@....com>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Maxime Ripard <mripard@...nel.org>,
	Andrzej Hajda <andrzej.hajda@...el.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Robert Foss <rfoss@...nel.org>, Jonas Karlman <jonas@...boo.se>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/bridge: imx: Remove redundant checks on existence of
 bridge->encoder

Hi Sui,

Thank you for the patch.

On Sat, May 11, 2024 at 11:08:16PM +0800, Sui Jingfeng wrote:
> The check on the existence of bridge->encoder on the implementation layer
> of drm bridge driver is not necessary, as it has already been done in the
> drm_bridge_attach() function. It is guaranteed that the .encoder member
> of the drm_bridge instance is not NULL when various imx_xxx_bridge_attach()
> function gets called.
> 
> Remove the redundant checking codes "if (!bridge->encoder) { ... }".
> 
> Signed-off-by: Sui Jingfeng <sui.jingfeng@...ux.dev>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
>  drivers/gpu/drm/bridge/imx/imx-ldb-helper.c         | 5 -----
>  drivers/gpu/drm/bridge/imx/imx8qxp-pixel-combiner.c | 5 -----
>  drivers/gpu/drm/bridge/imx/imx8qxp-pixel-link.c     | 5 -----
>  drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c        | 5 -----
>  4 files changed, 20 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/imx/imx-ldb-helper.c b/drivers/gpu/drm/bridge/imx/imx-ldb-helper.c
> index 6967325cd8ee..9b5bebbe357d 100644
> --- a/drivers/gpu/drm/bridge/imx/imx-ldb-helper.c
> +++ b/drivers/gpu/drm/bridge/imx/imx-ldb-helper.c
> @@ -116,11 +116,6 @@ int ldb_bridge_attach_helper(struct drm_bridge *bridge,
>  		return -EINVAL;
>  	}
>  
> -	if (!bridge->encoder) {
> -		DRM_DEV_ERROR(ldb->dev, "missing encoder\n");
> -		return -ENODEV;
> -	}
> -
>  	return drm_bridge_attach(bridge->encoder,
>  				ldb_ch->next_bridge, bridge,
>  				DRM_BRIDGE_ATTACH_NO_CONNECTOR);
> diff --git a/drivers/gpu/drm/bridge/imx/imx8qxp-pixel-combiner.c b/drivers/gpu/drm/bridge/imx/imx8qxp-pixel-combiner.c
> index d0868a6ac6c9..e6dbbdc87ce2 100644
> --- a/drivers/gpu/drm/bridge/imx/imx8qxp-pixel-combiner.c
> +++ b/drivers/gpu/drm/bridge/imx/imx8qxp-pixel-combiner.c
> @@ -119,11 +119,6 @@ static int imx8qxp_pc_bridge_attach(struct drm_bridge *bridge,
>  		return -EINVAL;
>  	}
>  
> -	if (!bridge->encoder) {
> -		DRM_DEV_ERROR(pc->dev, "missing encoder\n");
> -		return -ENODEV;
> -	}
> -
>  	return drm_bridge_attach(bridge->encoder,
>  				 ch->next_bridge, bridge,
>  				 DRM_BRIDGE_ATTACH_NO_CONNECTOR);
> diff --git a/drivers/gpu/drm/bridge/imx/imx8qxp-pixel-link.c b/drivers/gpu/drm/bridge/imx/imx8qxp-pixel-link.c
> index ed8b7a4e0e11..1d11cc1df43c 100644
> --- a/drivers/gpu/drm/bridge/imx/imx8qxp-pixel-link.c
> +++ b/drivers/gpu/drm/bridge/imx/imx8qxp-pixel-link.c
> @@ -138,11 +138,6 @@ static int imx8qxp_pixel_link_bridge_attach(struct drm_bridge *bridge,
>  		return -EINVAL;
>  	}
>  
> -	if (!bridge->encoder) {
> -		DRM_DEV_ERROR(pl->dev, "missing encoder\n");
> -		return -ENODEV;
> -	}
> -
>  	return drm_bridge_attach(bridge->encoder,
>  				 pl->next_bridge, bridge,
>  				 DRM_BRIDGE_ATTACH_NO_CONNECTOR);
> diff --git a/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c b/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c
> index 4a886cb808ca..fb7cf4369bb8 100644
> --- a/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c
> +++ b/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c
> @@ -58,11 +58,6 @@ static int imx8qxp_pxl2dpi_bridge_attach(struct drm_bridge *bridge,
>  		return -EINVAL;
>  	}
>  
> -	if (!bridge->encoder) {
> -		DRM_DEV_ERROR(p2d->dev, "missing encoder\n");
> -		return -ENODEV;
> -	}
> -
>  	return drm_bridge_attach(bridge->encoder,
>  				 p2d->next_bridge, bridge,
>  				 DRM_BRIDGE_ATTACH_NO_CONNECTOR);

-- 
Regards,

Laurent Pinchart