Re: [PATCH v2 0/6] Enable HDMI support on Exynos platforms

[Tobias Jakobi <liquid.acid@gmx.net>]

Hello,

so OK, this doesn't look too good.

Tobias Jakobi wrote:
> I checked with my panel just now and played around a bit with the DRM
> (opening, vsync, etc.). However on deinitialization the entire system
> locked up. I currently haven't hooked the board up to the serial
> console, otherwise I would've tried to extract some more meaningful
> information.
> 
> Going to check again more thoroughly on the weekend what exactly
> triggers the lockup.

So, first of all I did my initial test with the exynos video backend of
RetroArch. But it turns out that there's no fancy application needed. I
now tested this with the 'modetest' application from libdrm, and did this:

./modetest -M exynos -s 16@13:1920x1080
setting mode 1920x1080-60Hz@XR24 on connectors 16, crtc 13
^C
./modetest -M exynos -s 16@13:640x480
setting mode 640x480-60Hz@XR24 on connectors 16, crtc 13
^C
./modetest -M exynos -s 16@13:640x480
setting mode 640x480-60Hz@XR24 on connectors 16, crtc 13
^C
./modetest -M exynos -s 16@13:640x480

The board instantly died then. No kernel log output from the serial
console, the heartbeat just stops and the board is dead. Need to
power-cycle to get it running again.

I'm unsure how to triage this at all.

@Marek: Could you check if this also happens for you?

With best wishes,
Tobias