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

Alexander Stein
2025-02-06T15:39:21Z

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@ew.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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