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

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Message-ID: <CAD++jLk8-0Rkh16T+R1dh6=e_f9U1i=AKOk1Y8dLGV4bxzRtFg@mail.gmail.com>
Date: Sun, 14 Dec 2025 12:14:12 +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 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!

Yours,
Linus Walleij