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From:   Linus Walleij <linus.walleij@linaro.org>
Date:   Mon, 27 Nov 2023 17:03:53 +0100
Message-ID: <CACRpkdZAtxh5muhbPKvmUQGtQogs3UhGxNZqnSGWoWQNUL7=9g@mail.gmail.com>
Subject: Re: [PATCH v2 0/2] drm/bridge: panel: Check device dependency before
 managing device link
To:     Liu Ying <victor.liu@nxp.com>
Cc:     linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
        linux-next@vger.kernel.org, sfr@canb.auug.org.au,
        gregkh@linuxfoundation.org, rafael@kernel.org,
        andrzej.hajda@intel.com, neil.armstrong@linaro.org,
        rfoss@kernel.org, Laurent.pinchart@ideasonboard.com,
        jonas@kwiboo.se, jernej.skrabec@gmail.com,
        maarten.lankhorst@linux.intel.com, mripard@kernel.org,
        tzimmermann@suse.de, airlied@gmail.com, daniel@ffwll.ch,
        angelogioacchino.delregno@collabora.com, ulf.hansson@linaro.org
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On Mon, Nov 27, 2023 at 6:10=E2=80=AFAM Liu Ying <victor.liu@nxp.com> wrote=
:

> This series aims to check panel device dependency upon DRM device before
> managing device link between them.  It fixes eariler patches in v6.7-rc1
> which tried to manage the link.  Without this series, the link fails to
> be added for dependent panel devices and hence relevant panel bridges
> fail to be attached.  A real broken panel is "novatek,nt35510" defined
> in arch/arm/boot/dts/st/ste-ux500-samsung-skomer.dts as reported by
> Linus Walleij.
>
> Patch 1 exports device_is_dependent() to modules as needed by patch 2.
> Patch 2 checks device dependency before managing the device link.
>
> Note that patch 2 is already in drm-misc/drm-misc-fixes and
> drm-misc/for-linux-next-fixes.  Patch 1 needs to be reviewed and picked u=
p.
>
> v2:
> * Introduce patch 1 to export device_is_dependent() to modules as needed =
by
>   patch 2.
>
> Liu Ying (2):
>   driver core: Export device_is_dependent() to modules
>   drm/bridge: panel: Check device dependency before managing device link

I just applied patch 1 directly to the drm-misc-fixes so we don't have to
revert and then re-apply patches, because that is a bigger evil. (We can't
rebase these branches...)

Yours,
Linus Walleij