linux-kernel - Re: [PATCH v2 0/2] drm/bridge: panel: Check device dependency before managing device link

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Message-ID: <CACRpkdZAtxh5muhbPKvmUQGtQogs3UhGxNZqnSGWoWQNUL7=9g@mail.gmail.com>
Date:   Mon, 27 Nov 2023 17:03:53 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Liu Ying <victor.liu@....com>
Cc:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-next@...r.kernel.org, sfr@...b.auug.org.au,
        gregkh@...uxfoundation.org, rafael@...nel.org,
        andrzej.hajda@...el.com, neil.armstrong@...aro.org,
        rfoss@...nel.org, Laurent.pinchart@...asonboard.com,
        jonas@...boo.se, jernej.skrabec@...il.com,
        maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de, airlied@...il.com, daniel@...ll.ch,
        angelogioacchino.delregno@...labora.com, ulf.hansson@...aro.org
Subject: Re: [PATCH v2 0/2] drm/bridge: panel: Check device dependency before
 managing device link

On Mon, Nov 27, 2023 at 6:10 AM Liu Ying <victor.liu@....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 up.
>
> 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