linux-kernel - Re: [PATCH v5 4/4] drm: bridge: ti-sn65dsi83: Add error recovery mechanism

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Message-ID: <20250206162048.1f159ba6@bootlin.com>
Date: Thu, 6 Feb 2025 16:20:48 +0100
From: Herve Codina <herve.codina@...tlin.com>
To: Alexander Stein <alexander.stein@...tq-group.com>
Cc: 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>, David Airlie
 <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, Maarten Lankhorst
 <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
 Thomas Zimmermann <tzimmermann@...e.de>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Dave Stevenson <dave.stevenson@...pberrypi.com>,
 Maíra Canal <mcanal@...lia.com>, Raspberry Pi Kernel
 Maintenance <kernel-list@...pberrypi.com>, Marek Vasut <marex@...x.de>,
 dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, Louis Chauvet <louis.chauvet@...tlin.com>,
 Luca Ceresoli <luca.ceresoli@...tlin.com>, Thomas Petazzoni
 <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v5 4/4] drm: bridge: ti-sn65dsi83: Add error recovery
 mechanism

Hi Alexander,

On Thu, 06 Feb 2025 15:38:42 +0100
Alexander Stein <alexander.stein@...tq-group.com> wrote:

...
> With interrupt configured I got the following stack trace upon
> reboot/poweroff:
> 
> [   91.317264] sn65dsi83 2-002d: reset the pipe
> [   91.344093] Unable to handle ke
> ** replaying previous printk message **
> [   91.344093] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
...

Ouch :(

One question to help me investigating:
Do you have the issue at init/probe or when you start to display graphics?

Best regards,
Hervé