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Message-ID: <20260203083110.woan3gmc3qdh7nmm@pengutronix.de> Date: Tue, 3 Feb 2026 09:31:10 +0100 From: Marco Felsch <m.felsch@...gutronix.de> To: "Ming Qian(OSS)" <ming.qian@....nxp.com> Cc: Nicolas Dufresne <nicolas@...fresne.ca>, linux-media@...r.kernel.org, imx@...ts.linux.dev, ulf.hansson@...aro.org, Frank.li@....com, peng.fan@....com, festevam@...il.com, robh@...nel.org, benjamin.gaignard@...labora.com, sebastian.fricke@...labora.com, linux-imx@....com, devicetree@...r.kernel.org, conor+dt@...nel.org, p.zabel@...gutronix.de, linux-pm@...r.kernel.org, s.hauer@...gutronix.de, mchehab@...nel.org, linux-arm-kernel@...ts.infradead.org, eagle.zhou@....com, linux-kernel@...r.kernel.org, kernel@...gutronix.de, hverkuil-cisco@...all.nl, krzk+dt@...nel.org, shawnguo@...nel.org, l.stach@...gutronix.de Subject: Re: [PATCH] arm64: dts: imx8mq: Restore VPU G2 clock to 600MHz for 4K60fps decoding Hi, sorry for jumping in. On 26-02-03, Ming Qian(OSS) wrote: > Hi Nicolas, > > On 2/3/2026 3:12 AM, Nicolas Dufresne wrote: > > Hi, > > > > Le lundi 02 février 2026 à 13:44 -0500, Nicolas Dufresne a écrit : > > > > This doesn't sound like just a VPU issue; 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. Once it comes to system stability, you need to ensure that your bootstack is aligned e.g. same TF-A version and sometimes same bootloader since there might be workarounds/erratum applied by the boot firmware. Regards, Marco > > 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 > > ./fluster.py run -ts JCT-VC-HEVC_V1 -d GStreamer-H.265-V4L2SL-Gst1.0 -j2 -t > 90 > **************************************************************************************************** > Running test suite JCT-VC-HEVC_V1 with decoder > GStreamer-H.265-V4L2SL-Gst1.0 > Using 2 parallel job(s) > **************************************************************************************************** > > Ran 139/147 tests successfully in 505.434 secs > Ran 139/147 tests successfully in 505.350 secs > Ran 139/147 tests successfully in 507.540 secs > > 600Mhz, 1.0v > cat /sys/kernel/debug/regulator/regulator_summary |grep SW1C > SW1C 0 1 0 unknown 1000mV 0mA > 825mV 1100mV > cat /sys/kernel/debug/clk/vpu_g2/clk_rate > 600000000 > > ./fluster.py run -ts JCT-VC-HEVC_V1 -d GStreamer-H.265-V4L2SL-Gst1.0 -j2 -t > 90 > Ran 139/147 tests successfully in 506.901 secs > > 300Mhz, 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 > 300000000 > > ./fluster.py run -ts JCT-VC-HEVC_V1 -d GStreamer-H.265-V4L2SL-Gst1.0 -j2 -t > 90 > Ran 139/147 tests successfully in 506.063 secs > > Downstream v4l2 driver > cat /sys/kernel/debug/regulator/regulator_summary |grep SW1C > SW1C 0 2 0 unknown 1000mV 0mA > 825mV 1100mV > cat /sys/kernel/debug/clk/vpu_g2/clk_rate > 600000000 > > ./fluster.py run -ts JCT-VC-HEVC_V1 -d GStreamer-H.265-V4L2-Gst1.0 -j2 -t > 90 > Ran 136/147 tests successfully in 460.435 secs > > Regards, > Ming > > -- #gernperDu #CallMeByMyFirstName Pengutronix e.K. | | Steuerwalder Str. 21 | https://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-9 |
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