Hello,
On 2015-01-16 23:32, Tobias Jakobi wrote:
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.
Thanks for you tests and pointing this issue. I turned out that the
initial fix proposed
by Andrzej Hajda
(http://www.spinics.net/lists/linux-samsung-soc/msg38915.html) worked
fine, while the final version merged to clock fixes ('clk: samsung:
exynos4: set parent
of sclk_hdmiphy to hdmi' - commit
df019a5c0f7083001cb694f44821ca506425bda2) doesn't work
properly.
Please check the following kernel tree - instead of hacking around hdmi
clock I've added
handling of it directly to drm mixer driver:
https://git.linaro.org/people/marek.szyprowski/linux-srpol.git/shortlog/refs/heads/v3.19-odroid-hdmi
I hope that this will finally solve all mixer initialization related
issues (also for
Odroid XU3, discussed recently in the other thread). If it works fine, I
will resend
exynos4 hdmi patches to include this change.
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
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