linux-kernel - Re: [PATCH] drm/bridge: waveshare-dsi: Register and attach our DSI device at probe

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Message-ID: <ffd8b675-687e-457b-bbd0-88e91ee3520c@mailbox.org>
Date: Tue, 3 Feb 2026 23:28:32 +0100
From: Marek Vasut <marek.vasut@...lbox.org>
To: dri-devel@...ts.freedesktop.org, Joseph Guo <qijian.guo@....com>
Cc: Andrzej Hajda <andrzej.hajda@...el.com>, David Airlie
 <airlied@...il.com>, Jernej Skrabec <jernej.skrabec@...il.com>,
 Jonas Karlman <jonas@...boo.se>,
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>,
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>,
 Simona Vetter <simona@...ll.ch>, Thomas Zimmermann <tzimmermann@...e.de>,
 linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH] drm/bridge: waveshare-dsi: Register and attach our DSI
 device at probe

On 1/13/26 12:47 AM, Marek Vasut wrote:
> In order to avoid any probe ordering issue, the best practice is to move
> the secondary MIPI-DSI device registration and attachment to the
> MIPI-DSI host at probe time.
> 
> Signed-off-by: Marek Vasut <marek.vasut+renesas@...lbox.org>
> ---
> Note that this is similar to e.g. commit
> 6ef7ee48765f ("drm/bridge: sn65dsi83: Register and attach our DSI device at probe")
> and pretty much what every other DSI-to-DPI bridge does.
> ---
> Cc: Andrzej Hajda <andrzej.hajda@...el.com>
> Cc: David Airlie <airlied@...il.com>
> Cc: Jernej Skrabec <jernej.skrabec@...il.com>
> Cc: Jonas Karlman <jonas@...boo.se>
> Cc: Laurent Pinchart <Laurent.pinchart@...asonboard.com>
> Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
> Cc: Maxime Ripard <mripard@...nel.org>
> Cc: Neil Armstrong <neil.armstrong@...aro.org>
> Cc: Robert Foss <rfoss@...nel.org>
> Cc: Simona Vetter <simona@...ll.ch>
> Cc: Thomas Zimmermann <tzimmermann@...e.de>
> Cc: dri-devel@...ts.freedesktop.org
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-renesas-soc@...r.kernel.org
> ---
>   drivers/gpu/drm/bridge/waveshare-dsi.c | 7 +------
>   1 file changed, 1 insertion(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/waveshare-dsi.c b/drivers/gpu/drm/bridge/waveshare-dsi.c
> index 43f4e7412d722..9254446f54958 100644
> --- a/drivers/gpu/drm/bridge/waveshare-dsi.c
> +++ b/drivers/gpu/drm/bridge/waveshare-dsi.c
> @@ -80,11 +80,6 @@ static int ws_bridge_bridge_attach(struct drm_bridge *bridge,
>   				   enum drm_bridge_attach_flags flags)
>   {
>   	struct ws_bridge *ws = bridge_to_ws_bridge(bridge);
> -	int ret;
> -
> -	ret = ws_bridge_attach_dsi(ws);
> -	if (ret)
> -		return ret;
>   
>   	return drm_bridge_attach(encoder, ws->next_bridge,
>   				 &ws->bridge, flags);
> @@ -179,7 +174,7 @@ static int ws_bridge_probe(struct i2c_client *i2c)
>   	ws->bridge.of_node = dev->of_node;
>   	devm_drm_bridge_add(dev, &ws->bridge);
>   
> -	return 0;
> +	return ws_bridge_attach_dsi(ws);
>   }
>   
>   static const struct of_device_id ws_bridge_of_ids[] = {

Is there anything that should be done with this patch ?