linux-kernel - Re: [PATCH 0/4] drm: Revert and fix enable/disable sequence

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Message-ID: <CAD++jLkpWoHe5qYSABF1GeDq-9hZh7ZdL-+8Xqu5MA_erzNqsA@mail.gmail.com>
Date: Fri, 5 Dec 2025 13:36:15 +0100
From: Linus Walleij <linusw@...nel.org>
To: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
	Andrzej Hajda <andrzej.hajda@...el.com>, Neil Armstrong <neil.armstrong@...aro.org>, 
	Robert Foss <rfoss@...nel.org>, Laurent Pinchart <Laurent.pinchart@...asonboard.com>, 
	Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>, 
	Dmitry Baryshkov <lumag@...nel.org>, Chun-Kuang Hu <chunkuang.hu@...nel.org>, 
	Philipp Zabel <p.zabel@...gutronix.de>, Matthias Brugger <matthias.bgg@...il.com>, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, Jyri Sarha <jyri.sarha@....fi>, 
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
	linux-mediatek@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org, 
	Marek Szyprowski <m.szyprowski@...sung.com>, 
	Louis-Alexis Eyraud <louisalexis.eyraud@...labora.com>, 
	Aradhya Bhatia <aradhya.bhatia@...ux.dev>, Chaoyi Chen <chaoyi.chen@...k-chips.com>, 
	Vicente Bergas <vicencb@...il.com>, Marek Vasut <marek.vasut+renesas@...lbox.org>, 
	stable@...r.kernel.org
Subject: Re: [PATCH 0/4] drm: Revert and fix enable/disable sequence

On Fri, Dec 5, 2025 at 10:52 AM Tomi Valkeinen
<tomi.valkeinen@...asonboard.com> wrote:

> Changing the enable/disable sequence in commit c9b1150a68d9
> ("drm/atomic-helper: Re-order bridge chain pre-enable and post-disable")
> has caused regressions on multiple platforms: R-Car, MCDE, Rockchip.
>
> This is an alternate series to Linus' series:
>
> https://lore.kernel.org/all/20251202-mcde-drm-regression-thirdfix-v6-0-f1bffd4ec0fa%40kernel.org/
>
> This series first reverts the original commit and reverts a fix for
> mediatek which is no longer needed. It then exposes helper functions
> from DRM core, and finally implements the new sequence only in the tidss
> driver.
>
> There is one more fix in upstream for the original commit, commit
> 5d91394f2361 ("drm/exynos: fimd: Guard display clock control with
> runtime PM calls"), but I have not reverted that one as it looks like a
> valid patch in its own.
>
> I added Cc stable v6.17+ to all patches, but I didn't add Fixes tags, as
> I wasn't sure what should they point to. But I could perhaps add Fixes:
> <original commit> to all of these.
>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>

The series:
Reviewed-by: Linus Walleij <linusw@...nel.org>
Tested-by: Linus Walleij <linusw@...nel.org>

In my opinion Laurent is the more senior maintainer and my
trust level in him is the highest of all the maintainers, so
I think we should apply this revert series if
Laurent ACKs that this is what he thinks is best for DRI.

Yours,
Linus Walleij