linux-kernel - Re: [PATCH v4 01/11] drm/bridge: cdns-dsi: Fix OF node pointer

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Date: Wed, 26 Jun 2024 13:06:31 +0300
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: Aradhya Bhatia <a-bhatia1@...com>,
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
 Andrzej Hajda <andrzej.hajda@...el.com>,
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>,
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Jyri Sarha <jyri.sarha@....fi>,
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
 Daniel Vetter <daniel@...ll.ch>
Cc: DRI Development List <dri-devel@...ts.freedesktop.org>,
 Linux Kernel List <linux-kernel@...r.kernel.org>,
 Dominik Haller <d.haller@...tec.de>, Sam Ravnborg <sam@...nborg.org>,
 Thierry Reding <treding@...dia.com>,
 Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
 Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>,
 Praneeth Bajjuri <praneeth@...com>, Udit Kumar <u-kumar1@...com>,
 Devarsh Thakkar <devarsht@...com>, Jayesh Choudhary <j-choudhary@...com>,
 Jai Luthra <j-luthra@...com>
Subject: Re: [PATCH v4 01/11] drm/bridge: cdns-dsi: Fix OF node pointer

Hi,

On 22/06/2024 14:09, Aradhya Bhatia wrote:
> Fix the OF node pointer passed to the of_drm_find_bridge() call to find
> the next bridge in the display chain.
> 
> To find the next bridge in the pipeline, we need to pass "np" - the OF
> node pointer of the next entity in the devicetree chain. Passing
> "of_node" to of_drm_find_bridge will make the function try to fetch the
> bridge for the cdns-dsi which is not what's required.
> 
> Fix that.

The code looks fine, but I'd write the subject and desc from a different 
perspective. The subject could be something like "Fix connecting to a 
sink bridge", and the desc could first say that connecting the sink to a 
DSI panel works, but connecting to a bridge fails, as wrong OF node is 
passed to of_drm_find_bridge().

Reviewed-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>

  Tomi

> Fixes: e19233955d9e ("drm/bridge: Add Cadence DSI driver")
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Signed-off-by: Aradhya Bhatia <a-bhatia1@...com>
> ---
>   drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
> index 7457d38622b0..b016f2ba06bb 100644
> --- a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
> +++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
> @@ -952,7 +952,7 @@ static int cdns_dsi_attach(struct mipi_dsi_host *host,
>   		bridge = drm_panel_bridge_add_typed(panel,
>   						    DRM_MODE_CONNECTOR_DSI);
>   	} else {
> -		bridge = of_drm_find_bridge(dev->dev.of_node);
> +		bridge = of_drm_find_bridge(np);
>   		if (!bridge)
>   			bridge = ERR_PTR(-EINVAL);
>   	}