linux-kernel - Re: [PATCH v9 5/9] drm/bridge: anx7625: Check for Type-C during panel registration

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Message-ID: <CAGXv+5GnLhUfdDzDQ2Y1Hb7gb+rjZzMhLU+38MYR+VHRdUCtkQ@mail.gmail.com>
Date:   Mon, 9 Jan 2023 18:11:34 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Pin-yen Lin <treapking@...omium.org>
Cc:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Prashant Malani <pmalani@...omium.org>,
        Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        Marek Vasut <marex@...x.de>, devicetree@...r.kernel.org,
        Nícolas F . R . A . Prado 
        <nfraprado@...labora.com>, linux-acpi@...r.kernel.org,
        Allen Chen <allen.chen@....com.tw>,
        Javier Martinez Canillas <javierm@...hat.com>,
        dri-devel@...ts.freedesktop.org,
        Stephen Boyd <swboyd@...omium.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        chrome-platform@...ts.linux.dev, Xin Ji <xji@...logixsemi.com>,
        linux-kernel@...r.kernel.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH v9 5/9] drm/bridge: anx7625: Check for Type-C during panel registration

On Mon, Jan 9, 2023 at 4:41 PM Pin-yen Lin <treapking@...omium.org> wrote:
>
> The output port endpoints can be connected to USB-C connectors.
> Running drm_of_find_panel_or_bridge() with such endpoints leads to
> a continuous return value of -EPROBE_DEFER, even though there is
> no panel present.
>
> To avoid this, check for the existence of a "mode-switch" property in
> the port endpoint, and skip panel registration completely if so.
>
> Signed-off-by: Pin-yen Lin <treapking@...omium.org>

Reviewed-by: Chen-Yu Tsai <wenst@...omium.org>
Tested-by: Chen-Yu Tsai <wenst@...omium.org>

on MT8192 based Hayato (ASUS Chromebook Flip CM3200).