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it's related to the display or >>>>> DDR. >>>>> If not displayed, do the fluster test cases yield different results at >>>>> 600MHz and 300MHz? >>>> >>>> Didn't you run these tests before sending ? I can try again, but in my >>>> internal >>>> notes, I wrote: >>>> >>>> > Tested that, and everything becomes unstable >>>> >>>> That was before I figure-out the IRQ handler didn't handle exception bits that >>>> didn't stop the decoder (or dry IRQ, which strangely is common from the G2). >>> >>> Ran some fluster tests now. With this patch the results is not consistent >>> anymore. Then I ran it with weston being started, and in the middle of the test >>> the display turned black. Matches my past observation. We did reproduce this on >>> BSP kernel too. When the display goes black, the recent hantro drivers reports: >>> >>> [ 827.581586] hantro-vpu 38310000.video-codec: frame decode timed out. >>> [ 827.720201] hantro-vpu 38310000.video-codec: not all macroblocks were >>> decoded. >>> >>> >>> I have local patches to reduce the cascade of errors, so it likely survived >>> longer then last time. I will send these patches soon. The "not all macroblocks >>> were decoded." is triggered by a bit in the status register that is not >>> documented in NXP TRM. I found that bit in some VC8000D documentation (the >>> sucessor of G2). I concluded it was the same meaning after looking at the failed >>> buffer visually, it is indeed missing couple of macroblocks near th end. Each >>> time we see this error, the DCSS gives up and turn either black, or sometimes >>> other color. The second case has been tracked to a DCSS Scaler underrun, the >>> first we don't know. >>> >>> Fluster command ran (two threads, never completes): >>> >>> ./fluster.py run -d GStreamer-H.265-V4L2SL-Gst1.0 -ts JCT-VC-HEVC_V1 -j2 -t90 >>> >>> Nicolas >> >> My test results for fluster differ from yours. >> On my end, the results for JCT-VC-HEVC_V1 are consistent at both 300MHz >> and 600MHz. >> And results remained unchanged after multiple tests. >> >> I'm not sure what caused the differences between us. >> >> Below are my test results: >> >> 600Mhz, 0.9v >> cat /sys/kernel/debug/regulator/regulator_summary |grep SW1C >> SW1C 0 1 0 unknown 900mV 0mA >> 825mV 1100mV >> cat /sys/kernel/debug/clk/vpu_g2/clk_rate >> 600000000 > > You are driving the SoC out of spec. The datasheet clearly states that > you need a 1000mV typical voltage for 600MHz VPU clock. > > If you drive the SoC outside of those ratings it squarely depends on > the individual SoC if it will tolerate the too low voltage without > errors. Some SoCs land on the better side of PVT curve and will run at > the higher speed without issues, but some will not and will exhibit > random issues outside of the datasheet provided specs. > > There isn't much to discuss here. The upstream DT for the i.MX8MQ runs > all the clocks at a rate to meet the nominal drive voltage specs. If > some peripheral clock does violate this, this is a bug not a feature to > replicate in new patches. > > Regards, > Lucas I agree with you, it's meaningless that test vpu with overdriver clock frequency and nominal drive voltage. We should focus on the overdrive mode at a frequency of 600 MHz and a voltage of 1.0 V. It is my mistake that not to adjust the voltage in this patch. Regards, Ming