linux-kernel - Re: [PATCH] drm: of: Properly try all possible cases for bridge/panel detection

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Date:   Fri, 18 Mar 2022 21:35:11 +0530
From:   Jagan Teki <jagan@...rulasolutions.com>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH] drm: of: Properly try all possible cases for bridge/panel detection

Hi Paul,

On Wed, Mar 9, 2022 at 8:02 PM Paul Kocialkowski
<paul.kocialkowski@...tlin.com> wrote:
>
> While bridge/panel detection was initially relying on the usual
> port/ports-based of graph detection, it was recently changed to
> perform the lookup on any child node that is not port/ports
> instead when such a node is available, with no fallback on the
> usual way.
>
> This results in breaking detection when a child node is present
> but does not contain any panel or bridge node, even when the
> usual port/ports-based of graph is there.

Can you add that pipeline example on the commit message, it gives more
information on specific use cases why the existing code breaks.

Thanks,
Jagan.