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

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 for Android: free password hash cracker in your pocket

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

Message-ID: <20250207190816.2002d313@bootlin.com>
Date: Fri, 7 Feb 2025 19:08:16 +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 16:39:09 +0100
Alexander Stein <alexander.stein@...tq-group.com> wrote:

> 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.
> 

Found the issue.

Can you give me following information so that I can validate what I
understood:
  - Is your interrupt line connected directly to the SoC?
  - Is there any pullup/pulldown on your interrupt line?
  - In your devicetree what is the configuration used for this interrupt in
    terms of level or edge.

Anyway, I will send a fix in the next iteration.

Best regards,
Hervé