linux-kernel - Re: [PATCH 1/3] drm/bridge: samsung-dsim: move bridge init sequence to atomic

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Message-ID: <ac1832c1-e63b-45ba-9c57-83e56b34ed6d@samsung.com>
Date: Mon, 26 Jan 2026 15:54:21 +0100
From: Marek Szyprowski <m.szyprowski@...sung.com>
To: Kaustabh Chakraborty <kauschluss@...root.org>, Inki Dae
	<inki.dae@...sung.com>, Jagan Teki <jagan@...rulasolutions.com>, 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>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH 1/3] drm/bridge: samsung-dsim: move bridge init sequence
 to atomic_enable

On 26.01.2026 09:57, Marek Szyprowski wrote:
> On 24.01.2026 18:20, Kaustabh Chakraborty wrote:
>> Since commit c9b1150a68d9 ("drm/atomic-helper: Re-order bridge chain
>> pre-enable and post-disable"), pre-enable sequence is called before the
>> CRTC is enabled.
>>
>> This causes unintended side-effects (abberation among potentially other
>> things) in the display when samsung_dsim_init() is called in the
>> pre-enable part of the sequence. Call it in samsung_dsim_atomic_enable()
>> instead.
>>
>> Cc: stable@...r.kernel.org # v6.17 and later
>> Signed-off-by: Kaustabh Chakraborty <kauschluss@...root.org>
>
> I'm not sure if this will be needed:
>
> https://lore.kernel.org/all/20251205-drm-seq-fix-v1-0-fda68fa1b3de@ideasonboard.com/ 
>

Even more, there is a pending similar patch:

https://lore.kernel.org/all/20250619-samsung-dsim-fix-v1-1-6b5de68fb115@ideasonboard.com/

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland