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

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Message-ID: <817b2358-0920-4b7a-abb1-133103d0f9fe@ideasonboard.com>
Date: Sun, 14 Dec 2025 14:42:03 +0200
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: Linus Walleij <linusw@...nel.org>
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>,
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 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>,
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
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 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>,
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 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

Hi,

On 14/12/2025 13:14, Linus Walleij wrote:
> On Fri, Dec 12, 2025 at 3:21 PM Tomi Valkeinen
> <tomi.valkeinen@...asonboard.com> wrote:
>> On 05/12/2025 11:51, Tomi Valkeinen 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.
> 
>> There has been no comments, so I assume this is the way to go.
>>
>> Should we merge this series as a fix for 6.18 rcs?
> 
> Too late now, so let's merge it as a fix for v6.19 rcs!
Ah, right. Indeed, I meant v6.19 rcs.

 Tomi