GPU hangs on iMX6q with CPU Freq 996k

[rolfw]

Hi

while running ELG programs on an i.MX6q run fine when using initial CPU freq of 369 kHz, after switching to 996 kHz they stop working with issuing 

[ 3249.942674] [galcore]: GPU[0] hang, automatic recovery.

[ 3249.956633] [galcore]: recovery done

in log. Any idea what's the problem here?

Linux 4.1.18 with galcore 5.0.11.p4.25762

Thanks

Rolf

[igorpadykov]

Hi Rolf

one can check if board is hanging without gpu drivers,

please try with L4.1.15 from nxp official i.MX6Q product page

(Linux 4.1.18 is not supported)

i.MX 6 Series Software and Development Tool|NXP 

If it hangs please run ddr test

https://community.freescale.com/docs/DOC-105652 

Best regards
igor
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[rolfw]

Hi Igor,

thanks for reply!

The board itself does not hang. I can stop the process, change the CPU Freq back to 369 kHz and GPU works fine again. I suppose may be some kind of bus freq or power manager problem or so. Debugging a bit the galcore I found that commands to the GPU got enqueued but then stuck and potentially never received by the GPU. 

I have looked into the latest NXP 4.1.15 branch and found that the galcore driver has been updated compared to what I am using and some new imx-busfreq drivers and DTS added compared to what I am using.

I am currently setting up a test with the L4.1.15 to see if it's working there and if so, updating my kernel drivers. Will report back, what's the result. In the meantime I was curious to hear if that problem is a common one experienced before.

Best

Rolf