Re: [PATCH v3] drm: of: Properly try all possible cases for bridge/panel detection

From: Linus Walleij
Date: Tue Apr 05 2022 - 22:33:19 EST

On Tue, Mar 29, 2022 at 3:27 PM Paul Kocialkowski
<paul.kocialkowski@xxxxxxxxxxx> 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.
> In order to support both situations properly, this commit reworks
> the logic to try both options and not just one of the two: it will
> only return -EPROBE_DEFER when both have failed.
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@xxxxxxxxxxx>
> Fixes: 80253168dbfd ("drm: of: Lookup if child node has panel or bridge")

This patch fixes the problems I have on the Ux500 MCDE with DPI
panels such as Janice, so:
Tested-by: Linus Walleij <linus.walleij@xxxxxxxxxx>

Linus Walleij