linux-kernel - Re: [PATCH v5 08/16] drm/bridge: Add helper to reset bridge pipeline

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250306091256.2f0e2e86@bootlin.com>
Date: Thu, 6 Mar 2025 09:12:56 +0100
From: Herve Codina <herve.codina@...tlin.com>
To: Maxime Ripard <mripard@...nel.org>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 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>, Douglas
 Anderson <dianders@...omium.org>, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org, Simona Vetter <simona.vetter@...ll.ch>
Subject: Re: [PATCH v5 08/16] drm/bridge: Add helper to reset bridge
 pipeline

Hi Maxime,

On Tue, 04 Mar 2025 12:10:51 +0100
Maxime Ripard <mripard@...nel.org> wrote:

> Let's provide an helper to make it easier for bridge drivers to
> power-cycle their bridge.
> 
> In order to avoid a circular dependency between that new helper and
> drm_atomic_helper_reset_crtc(), this new helper will be in a
> drm_bridge_helper.c file to follow the pattern we have for other
> objects.
> 
> Co-developed-by: Simona Vetter <simona.vetter@...ll.ch>
> Signed-off-by: Maxime Ripard <mripard@...nel.org>
> ---
>  drivers/gpu/drm/Makefile            |  1 +
>  drivers/gpu/drm/drm_bridge_helper.c | 55 +++++++++++++++++++++++++++++++++++++
>  include/drm/drm_bridge_helper.h     | 12 ++++++++
>  3 files changed, 68 insertions(+)
> 

Reviewed-by: Herve Codina <herve.codina@...tlin.com>

Also tested on my system using the ti-sn65dsi83 driver (updated in this series)
with faults manually generated on the hardware. No regressions were observed in
the driver recovery process. Works fine.

Tested-by: Herve Codina <herve.codina@...tlin.com>

Best regards,
Hervé