linux-kernel - Re: [PATCH v2] drm/bridge: Fix assignment of the of

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Message-ID: <ZxYBa11Ig_HHQngV@hovoldconsulting.com>
Date: Mon, 21 Oct 2024 09:23:23 +0200
From: Johan Hovold <johan@...nel.org>
To: Abel Vesa <abel.vesa@...aro.org>
Cc: 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>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH v2] drm/bridge: Fix assignment of the of_node of the
 parent to aux bridge

On Fri, Oct 18, 2024 at 03:49:34PM +0300, Abel Vesa wrote:
> The assignment of the of_node to the aux bridge needs to mark the
> of_node as reused as well, otherwise resource providers like pinctrl will
> report a gpio as already requested by a different device when both pinconf
> and gpios property are present.

I don't think you need a gpio property for that to happen, right? And
this causes probe to fail IIRC?

> Fix that by using the device_set_of_node_from_dev() helper instead.
> 
> Fixes: 6914968a0b52 ("drm/bridge: properly refcount DT nodes in aux bridge drivers")

This is not the commit that introduced the issue.

> Cc: stable@...r.kernel.org      # 6.8

I assume there are no existing devicetrees that need this since then we
would have heard about it sooner. Do we still need to backport it?

When exactly are you hitting this?

> Cc: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> ---
> Changes in v2:
> - Re-worded commit to be more explicit of what it fixes, as Johan suggested
> - Used device_set_of_node_from_dev() helper, as per Johan's suggestion
> - Added Fixes tag and cc'ed stable
> - Link to v1: https://lore.kernel.org/r/20241017-drm-aux-bridge-mark-of-node-reused-v1-1-7cd5702bb4f2@linaro.org

Patch itself looks good now.

Johan