Hi Herve, Am Freitag, 7. Februar 2025, 19:08:16 CET schrieb Herve Codina: > Hi Alexander, > > On Thu, 06 Feb 2025 16:39:09 +0100 > Alexander Stein <alexander.stein@xxxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxx> 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? No, unfortunately not. It's connected to a GPIO expander, which in turn delivers an IRQ to the SoC. In between the bridge and the expander is a buffer for voltage switch (1V8 -> 3V3). > - Is there any pullup/pulldown on your interrupt line? As far a I can tell, there is no pullup/pulldown on the IRQ line to the buffer. > - In your devicetree what is the configuration used for this interrupt in > terms of level or edge. As this line is connected to an expander (pca9555) only edge triggered interrupts are supported. > Anyway, I will send a fix in the next iteration. Thanks for digging into this. Best regards, Alexander -- TQ-Systems GmbH | Mühlstraße 2, Gut Delling | 82229 Seefeld, Germany Amtsgericht München, HRB 105018 Geschäftsführer: Detlef Schneider, Rüdiger Stahl, Stefan Schneider http://www.tq-group.com/
