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([2606:6d00:15:210e::5ac]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8c711ba6c58sm1610151685a.23.2026.02.03.07.40.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Feb 2026 07:40:55 -0800 (PST) Message-ID: Subject: Re: [PATCH] arm64: dts: imx8mq: Restore VPU G2 clock to 600MHz for 4K60fps decoding From: Nicolas Dufresne To: "Ming Qian(OSS)" , Marco Felsch Cc: linux-media@vger.kernel.org, imx@lists.linux.dev, ulf.hansson@linaro.org, Frank.li@nxp.com, peng.fan@nxp.com, festevam@gmail.com, robh@kernel.org, benjamin.gaignard@collabora.com, sebastian.fricke@collabora.com, linux-imx@nxp.com, devicetree@vger.kernel.org, conor+dt@kernel.org, p.zabel@pengutronix.de, linux-pm@vger.kernel.org, s.hauer@pengutronix.de, mchehab@kernel.org, linux-arm-kernel@lists.infradead.org, eagle.zhou@nxp.com, linux-kernel@vger.kernel.org, kernel@pengutronix.de, hverkuil-cisco@xs4all.nl, krzk+dt@kernel.org, shawnguo@kernel.org, l.stach@pengutronix.de Date: Tue, 03 Feb 2026 10:40:52 -0500 In-Reply-To: References: <20260130084133.2159-1-ming.qian@oss.nxp.com> <0b24716b-438c-4185-8a93-3a3879147c24@oss.nxp.com> <169eba79e8e1f906b1a0b59e22a531dfc7e57a1f.camel@ndufresne.ca> <5e3431c69da07557edb20a252c4759be8c857f08.camel@ndufresne.ca> <20260203083110.woan3gmc3qdh7nmm@pengutronix.de> Autocrypt: addr=nicolas@ndufresne.ca; prefer-encrypt=mutual; keydata=mDMEaCN2ixYJKwYBBAHaRw8BAQdAM0EHepTful3JOIzcPv6ekHOenE1u0vDG1gdHFrChD /e0J05pY29sYXMgRHVmcmVzbmUgPG5pY29sYXNAbmR1ZnJlc25lLmNhPoicBBMWCgBEAhsDBQsJCA cCAiICBhUKCQgLAgQWAgMBAh4HAheABQkJZfd1FiEE7w1SgRXEw8IaBG8S2UGUUSlgcvQFAmibrjo CGQEACgkQ2UGUUSlgcvQlQwD/RjpU1SZYcKG6pnfnQ8ivgtTkGDRUJ8gP3fK7+XUjRNIA/iXfhXMN abIWxO2oCXKf3TdD7aQ4070KO6zSxIcxgNQFtDFOaWNvbGFzIER1ZnJlc25lIDxuaWNvbGFzLmR1Z nJlc25lQGNvbGxhYm9yYS5jb20+iJkEExYKAEECGwMFCwkIBwICIgIGFQoJCAsCBBYCAwECHgcCF4 AWIQTvDVKBFcTDwhoEbxLZQZRRKWBy9AUCaCyyxgUJCWX3dQAKCRDZQZRRKWBy9ARJAP96pFmLffZ smBUpkyVBfFAf+zq6BJt769R0al3kHvUKdgD9G7KAHuioxD2v6SX7idpIazjzx8b8rfzwTWyOQWHC AAS0LU5pY29sYXMgRHVmcmVzbmUgPG5pY29sYXMuZHVmcmVzbmVAZ21haWwuY29tPoiZBBMWCgBBF iEE7w1SgRXEw8IaBG8S2UGUUSlgcvQFAmibrGYCGwMFCQll93UFCwkIBwICIgIGFQoJCAsCBBYCAw ECHgcCF4AACgkQ2UGUUSlgcvRObgD/YnQjfi4+L8f4fI7p1pPMTwRTcaRdy6aqkKEmKsCArzQBAK8 bRLv9QjuqsE6oQZra/RB4widZPvphs78H0P6NmpIJ Content-Type: multipart/signed; micalg="pgp-sha512"; protocol="application/pgp-signature"; boundary="=-okkgKqsgZ+IV64MKbOhB" User-Agent: Evolution 3.58.2 (3.58.2-1.fc43) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 --=-okkgKqsgZ+IV64MKbOhB Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Le mardi 03 f=C3=A9vrier 2026 =C3=A0 16:53 +0800, Ming Qian(OSS) a =C3=A9cr= it=C2=A0: > Hi Marco, >=20 > On 2/3/2026 4:31 PM, Marco Felsch wrote: > > [You don't often get email from m.felsch@pengutronix.de. Learn why this= is important at https://aka.ms/LearnAboutSenderIdentification=C2=A0] > >=20 > > Hi, > >=20 > > sorry for jumping in. > >=20 > > On 26-02-03, Ming Qian(OSS) wrote: > > > Hi Nicolas, > > >=20 > > > On 2/3/2026 3:12 AM, Nicolas Dufresne wrote: > > > > Hi, > > > >=20 > > > > Le lundi 02 f=C3=A9vrier 2026 =C3=A0 13:44 -0500, Nicolas Dufresne = a =C3=A9crit : > > > > > > This doesn't sound like just a VPU issue; it's related to the d= isplay or > > > > > > DDR. > > > > > > If not displayed, do the fluster test cases yield different res= ults at > > > > > > 600MHz and 300MHz? > > > > >=20 > > > > > Didn't you run these tests before sending ? I can try again, but = in my > > > > > internal > > > > > notes, I wrote: > > > > >=20 > > > > > =C2=A0=C2=A0=C2=A0 > Tested that, and everything becomes unstable > > > > >=20 > > > > > That was before I figure-out the IRQ handler didn't handle except= ion bits that > > > > > didn't stop the decoder (or dry IRQ, which strangely is common fr= om the G2). > > > >=20 > > > > Ran some fluster tests now. With this patch the results is not cons= istent > > > > 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 repro= duce this on > > > > BSP kernel too. When the display goes black, the recent hantro driv= ers reports: > > > >=20 > > > > [=C2=A0 827.581586] hantro-vpu 38310000.video-codec: frame decode t= imed out. > > > > [=C2=A0 827.720201] hantro-vpu 38310000.video-codec: not all macrob= locks were > > > > decoded. > > > >=20 > > > >=20 > > > > 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 documentati= on (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 unde= rrun, the > > > > first we don't know. > > > >=20 > > > > Fluster command ran (two threads, never completes): > > > >=20 > > > > ./fluster.py run -d GStreamer-H.265-V4L2SL-Gst1.0 -ts JCT-VC-HEVC_V= 1 -j2 -t90 > > > >=20 > > > > Nicolas > > >=20 > > > My test results for fluster differ from yours. > > > On my end, the results for JCT-VC-HEVC_V1 are consistent at both 300M= Hz and > > > 600MHz. > > > And results remained unchanged after multiple tests. After more testing, the fluster test is stable for NV12/NV15 tiled output f= or me too. I'm running the tests with linear NV12/P010, which imply an extra set = of buffer. I will check if I can give you a easy way to test the linear format= s. I also have couple of streams that systematically breaks at specific spot (hi= gh complexity scenes) with the provided patch. As most licensed content, this = is not sharable as-is. I will try and see if I can find a way to share somethi= ng. > > >=20 > > > I'm not sure what caused the differences between us. > >=20 > > 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. > >=20 > > Regards, > > =C2=A0=C2=A0 Marco > >=20 >=20 > Thanks for the reminder, and I agree. > I think we need to align our board environment first. I do likely have slightly different bootchain, and of course all the HDMI component are downstream, but I can't really isolate the dramatic issue of = this overclock without a display component of some sort. Its a huge differentiat= or in the bandwidth consumption which is the main challenge on this SoC so far. 1= 0bit videos makes things a lot worse fwiw. We did review latest IMX vendor firmware package and can confirm we are run= ning the latest memory training blob and HDMI firmware. Nicolas > Regards, > Ming >=20 > > >=20 > > > Below are my test results: > > >=20 > > > 600Mhz, 0.9v > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 cat /sys/kernel/debug/regulator/= regulator_summary=C2=A0 |grep SW1C > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 SW1C=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0= =C2=A0=C2=A0=C2=A0 1=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0 unknown=C2=A0=C2=A0 90= 0mV=C2=A0=C2=A0=C2=A0=C2=A0 0mA > > > 825mV=C2=A0 1100mV > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 cat /sys/kernel/debug/clk/vpu_g2= /clk_rate > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 600000000 > > >=20 > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ./fluster.py run -ts JCT-VC-HEVC= _V1 -d GStreamer-H.265-V4L2SL-Gst1.0 -j2 -t > > > 90 > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ********************************= ******************************************************************** > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Running test suite JCT-VC-HEVC_V= 1 with decoder > > > GStreamer-H.265-V4L2SL-Gst1.0 > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Using 2 parallel job(s) > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ********************************= ******************************************************************** > > >=20 > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Ran 139/147 tests successfully= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 in 505.434 secs > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Ran 139/147 tests successfully= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 in 505.350 secs > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Ran 139/147 tests successfully= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 in 507.540 secs > > >=20 > > > 600Mhz, 1.0v > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 cat /sys/kernel/debug/regulator/= regulator_summary=C2=A0 |grep SW1C > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 SW1C=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0= =C2=A0=C2=A0=C2=A0 1=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0 unknown=C2=A0 1000mV= =C2=A0=C2=A0=C2=A0=C2=A0 0mA > > > 825mV=C2=A0 1100mV > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 cat /sys/kernel/debug/clk/vpu_g2= /clk_rate > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 600000000 > > >=20 > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ./fluster.py run -ts JCT-VC-HEVC= _V1 -d GStreamer-H.265-V4L2SL-Gst1.0 -j2 -t > > > 90 > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Ran 139/147 tests successfully= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 in 506.901 secs > > >=20 > > > 300Mhz, 0.9v > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 cat /sys/kernel/debug/regulator/= regulator_summary=C2=A0 |grep SW1C > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 SW1C=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0= =C2=A0=C2=A0=C2=A0 1=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0 unknown=C2=A0=C2=A0 90= 0mV=C2=A0=C2=A0=C2=A0=C2=A0 0mA > > > 825mV=C2=A0 1100mV > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 cat /sys/kernel/debug/clk/vpu_g2= /clk_rate > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 300000000 > > >=20 > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ./fluster.py run -ts JCT-VC-HEVC= _V1 -d GStreamer-H.265-V4L2SL-Gst1.0 -j2 -t > > > 90 > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Ran 139/147 tests successfully= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 in 506.063 secs > > >=20 > > > Downstream v4l2 driver > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 cat /sys/kernel/debug/regulator/= regulator_summary=C2=A0 |grep SW1C > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 SW1C=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0= =C2=A0=C2=A0=C2=A0 2=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0 unknown=C2=A0 1000mV= =C2=A0=C2=A0=C2=A0=C2=A0 0mA > > > 825mV=C2=A0 1100mV > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 cat /sys/kernel/debug/clk/vpu_g2= /clk_rate > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 600000000 > > >=20 > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ./fluster.py run -ts JCT-VC-HEVC= _V1 -d GStreamer-H.265-V4L2-Gst1.0 -j2 -t > > > 90 > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Ran 136/147 tests successfully= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 in 460.435 secs > > >=20 > > > Regards, > > > Ming > > >=20 > > >=20 > >=20 > > -- > > #gernperDu > > #CallMeByMyFirstName > >=20 > > Pengutronix e.K.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | > > Steuerwalder Str. 21=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 | https://www.pengutronix.de/=C2=A0| > > 31137 Hildesheim, Germany=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | Phone: +49-5121= -206917-0=C2=A0=C2=A0=C2=A0 | > > Amtsgericht Hildesheim, HRA 2686=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 | Fax:=C2=A0=C2=A0 +49-5121-206917-9=C2=A0=C2=A0=C2= =A0 | --=-okkgKqsgZ+IV64MKbOhB Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- 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