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

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Message-ID: <8756830.T7Z3S40VBb@steina-w>
Date: Thu, 06 Feb 2025 16:39:09 +0100
From: Alexander Stein <alexander.stein@...tq-group.com>
To: Herve Codina <herve.codina@...tlin.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 Herve,

Am Donnerstag, 6. Februar 2025, 16:20:48 CET schrieb Herve Codina:
> 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?

This is during shutdown/poweroff. I assume that regmap_reg() in
sn65dsi83_handle_errors() fails and because of that reset_work is scheduled.

Best regards,
Alexander
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