On Mon, 27 Apr 2020 16:22:21 +0200,
Deucher, Alexander wrote:
>
> [AMD Public Use]
>
> > -----Original Message-----
> > From: Nicholas Johnson <nicholas.johnson-opensou...@outlook.com.au>
> > Sent: Sunday, April 26, 2020 12:02 PM
> > To: linux-ker...@vger.kernel.org
> > Cc: Deucher, Alexander <alexander.deuc...@amd.com>; Koenig, Christian
> > <christian.koe...@amd.com>; Zhou, David(ChunMing)
> > <david1.z...@amd.com>; Nicholas Johnson <nicholas.johnson-
> > opensou...@outlook.com.au>
> > Subject: [PATCH 0/1] Fiji GPU audio register timeout when in BACO state
> >
> > Hi all,
> >
> > Since Linux v5.7-rc1 / commit 4fdda2e66de0 ("drm/amdgpu/runpm: enable
> > runpm on baco capable VI+ asics"), my AMD R9 Nano has been using runpm /
> > BACO. You can tell visually when it sleeps, because the fan on the graphics
> > card is switched off to save power. It did not spin down the fan in v5.6.x.
> >
> > This is great (I love it), except that when it is sleeping, the PCIe audio
> > function
> > of the GPU has issues if anything tries to access it. You get dmesg errors
> > such
> > as these:
> >
> > snd_hda_intel 0000:08:00.1: spurious response 0x0:0x0, last cmd=0x170500
> > snd_hda_intel 0000:08:00.1: azx_get_response timeout, switching to polling
> > mode: last cmd=0x001f0500 snd_hda_intel 0000:08:00.1: No response from
> > codec, disabling MSI: last cmd=0x001f0500 snd_hda_intel 0000:08:00.1: No
> > response from codec, resetting bus: last cmd=0x001f0500
> > snd_hda_codec_hdmi hdaudioC1D0: Unable to sync register 0x2f0d00. -11
> >
> > The above is with the Fiji XT GPU at 0000:08:00.0 in a Thunderbolt enclosure
> > (not that Thunderbolt should affect it, but I feel I should mention it just
> > in
> > case). I dropped a lot of duplicate dmesg lines, as some of them repeated a
> > lot of times before the driver gave up.
> >
> > I offer this patch to disable runpm for Fiji while a fix is found, if you
> > decide
> > that is the best approach. Regardless, I will gladly test any patches you
> > come
> > up with instead and confirm that the above issue has been fixed.
> >
> > I cannot tell if any other GPUs are affected. The only other cards to which
> > I
> > have access are a couple of AMD R9 280X (Tahiti XT), which use radeon driver
> > instead of amdgpu driver.
>
> Adding a few more people. Do you know what is accessing the audio? The
> audio should have a dependency on the GPU device. The GPU won't enter
> runtime pm until the audio has entered runtime pm and vice versa on resume.
> Please attach a copy of your dmesg output and lspci output.
Also, please retest with the fresh 5.7-rc3. There was a known
regression regarding HD-audio PM in 5.7-rc1/rc2, and it's been fixed
there (commit 8d6762af302d).
thanks,
Takashi
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