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: <CAAMcf8BfxMJx+5ttEXx0kONP2OYWSLFqEYF6rfVBKoRg5TKZzQ@mail.gmail.com>
Date: Wed, 10 Sep 2025 17:17:19 +0200
From: Vicente Bergas <vicencb@...il.com>
To: aradhya.bhatia@...ux.dev
Cc: Laurent.pinchart@...asonboard.com, airlied@...il.com, 
	alexander.sverdlin@...mens.com, andrzej.hajda@...el.com, devarsht@...com, 
	dri-devel <dri-devel@...ts.freedesktop.org>, j-choudhary@...com, 
	jernej.skrabec@...il.com, Jonas Karlman <jonas@...boo.se>, 
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, lumag@...nel.org, 
	maarten.lankhorst@...ux.intel.com, mripard@...nel.org, 
	neil.armstrong@...aro.org, nm@...com, rfoss@...nel.org, simona@...ll.ch, 
	tomi.valkeinen@...asonboard.com, tzimmermann@...e.de, vigneshr@...com
Subject: Re: [PATCH v13 3/4] drm/atomic-helper: Re-order bridge chain
 pre-enable and post-disable

Hi,
this patch causes a regression. It has been reported in
https://bugzilla.kernel.org/show_bug.cgi?id=220554

It affects the gru/kevin platform (arm64,RK3399) with the Panfrost DRM driver.

When it boots in console mode, the blinking of the cursor keeps the display on.
If it is turned off via /sys/class/graphics/fbcon/cursor_blink, then
the display briefly shows each key press presented on screen for less
than one second and then powers off.

When starting the graphical mode (wayland), if there are no
applications drawing on the screen, the only way to keep the display
on is by continuously moving the mouse.

Regards,
  Vicente.