linux-kernel - Re: [PATCH v13 3/4] drm/atomic-helper: Re-order bridge chain pre-enable and post-disable

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Message-ID: <CACRpkdaOyDJ-ur6iO8qnWesL1SZ9C-okWO353rUKpTO-q8urWA@mail.gmail.com>
Date: Wed, 22 Oct 2025 10:24:37 +0200
From: Linus Walleij <linus.walleij@...aro.org>
To: Aradhya Bhatia <aradhya.bhatia@...ux.dev>
Cc: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>, Dmitry Baryshkov <lumag@...nel.org>, 
	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>, 
	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>, 
	DRI Development List <dri-devel@...ts.freedesktop.org>, 
	Linux Kernel List <linux-kernel@...r.kernel.org>, Nishanth Menon <nm@...com>, 
	Vignesh Raghavendra <vigneshr@...com>, Devarsh Thakkar <devarsht@...com>, Jayesh Choudhary <j-choudhary@...com>, 
	Alexander Sverdlin <alexander.sverdlin@...mens.com>
Subject: Re: [PATCH v13 3/4] drm/atomic-helper: Re-order bridge chain
 pre-enable and post-disable

On Thu, Jun 5, 2025 at 7:15 PM Aradhya Bhatia <aradhya.bhatia@...ux.dev> wrote:

> From: Aradhya Bhatia <a-bhatia1@...com>
>
> Move the bridge pre_enable call before crtc enable, and the bridge
> post_disable call after the crtc disable.

This commit regresses the MCDE driver to a hard boot failure.
Reverting the patch fixes the issue.

I think it has something to do with the internal DSI bridge in
drivers/gpu/drm/mcde/mcde_dsi.c

Any hints to what needs to be fixed here?

Yours,
Linus Walleij