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From:   "Deucher, Alexander" <Alexander.Deucher@amd.com>
To:     Nicholas Johnson <nicholas.johnson-opensource@outlook.com.au>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "amd-gfx@lists.freedesktop.org" <amd-gfx@lists.freedesktop.org>,
        Takashi Iwai <tiwai@suse.com>,
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        Lukas Wunner <lukas@wunner.de>
CC:     "Koenig, Christian" <Christian.Koenig@amd.com>,
        "Zhou, David(ChunMing)" <David1.Zhou@amd.com>
Subject: RE: [PATCH 0/1] Fiji GPU audio register timeout when in BACO state
Thread-Topic: [PATCH 0/1] Fiji GPU audio register timeout when in BACO state
Thread-Index: AQHWG+QP7B2I84lvqkerLlrYwJ82raiNBPhQ
Date:   Mon, 27 Apr 2020 14:22:21 +0000
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[AMD Public Use]

> -----Original Message-----
> From: Nicholas Johnson <nicholas.johnson-opensource@outlook.com.au>
> Sent: Sunday, April 26, 2020 12:02 PM
> To: linux-kernel@vger.kernel.org
> Cc: Deucher, Alexander <Alexander.Deucher@amd.com>; Koenig, Christian
> <Christian.Koenig@amd.com>; Zhou, David(ChunMing)
> <David1.Zhou@amd.com>; Nicholas Johnson <nicholas.johnson-
> opensource@outlook.com.au>
> Subject: [PATCH 0/1] Fiji GPU audio register timeout when in BACO state
>=20
> Hi all,
>=20
> 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 graphi=
cs
> card is switched off to save power. It did not spin down the fan in v5.6.=
x.
>=20
> This is great (I love it), except that when it is sleeping, the PCIe audi=
o function
> of the GPU has issues if anything tries to access it. You get dmesg error=
s such
> as these:
>=20
> snd_hda_intel 0000:08:00.1: spurious response 0x0:0x0, last cmd=3D0x17050=
0
> snd_hda_intel 0000:08:00.1: azx_get_response timeout, switching to pollin=
g
> mode: last cmd=3D0x001f0500 snd_hda_intel 0000:08:00.1: No response from
> codec, disabling MSI: last cmd=3D0x001f0500 snd_hda_intel 0000:08:00.1: N=
o
> response from codec, resetting bus: last cmd=3D0x001f0500
> snd_hda_codec_hdmi hdaudioC1D0: Unable to sync register 0x2f0d00. -11
>=20
> The above is with the Fiji XT GPU at 0000:08:00.0 in a Thunderbolt enclos=
ure
> (not that Thunderbolt should affect it, but I feel I should mention it ju=
st in
> case). I dropped a lot of duplicate dmesg lines, as some of them repeated=
 a
> lot of times before the driver gave up.
>=20
> 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.
>=20
> I cannot tell if any other GPUs are affected. The only other cards to whi=
ch I
> have access are a couple of AMD R9 280X (Tahiti XT), which use radeon dri=
ver
> instead of amdgpu driver.

Adding a few more people.  Do you know what is accessing the audio?  The au=
dio should have a dependency on the GPU device.  The GPU won't enter runtim=
e pm until the audio has entered runtime pm and vice versa on resume. Pleas=
e attach a copy of your dmesg output and lspci output.

Alex