From: Roy Spliet <nouveau@spliet.org>
To: Lukas Wunner <lukas@wunner.de>
Cc: Karol Herbst <kherbst@redhat.com>,
Kai-Heng Feng <kai.heng.feng@canonical.com>,
"moderated list:SOUND" <alsa-devel@alsa-project.org>,
Kai Vehmanen <kai.vehmanen@linux.intel.com>,
Takashi Iwai <tiwai@suse.de>,
nouveau <nouveau@lists.freedesktop.org>,
Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
tiwai@suse.com, Alex Deucher <alexander.deucher@amd.com>,
Alan Stern <stern@rowland.harvard.edu>,
Mike Rapoport <rppt@kernel.org>,
Linux PCI <linux-pci@vger.kernel.org>,
Bjorn Helgaas <bhelgaas@google.com>,
Jaroslav Kysela <perex@perex.cz>,
open list <linux-kernel@vger.kernel.org>,
Aaron Plattner <aplattner@nvidia.com>
Subject: Re: [Nouveau] [PATCH v2] ALSA: hda: Continue to probe when codec probe fails
Date: Sat, 10 Apr 2021 21:48:15 +0100 [thread overview]
Message-ID: <bddba2ca-15d5-7fd3-5b64-f4ba7e179ec0@spliet.org> (raw)
In-Reply-To: <20210410192314.GB16240@wunner.de>
Op 10-04-2021 om 20:23 schreef Lukas Wunner:
> On Sat, Apr 10, 2021 at 04:51:27PM +0100, Roy Spliet wrote:
>> Can I ask someone with more
>> technical knowledge of snd_hda_intel and vgaswitcheroo to brainstorm about
>> the possible challenges of nouveau taking matters into its own hand rather
>> than keeping this PCI quirk around?
>
> It sounds to me like the HDA is not powered if no cable is plugged in.
> What is reponsible then for powering it up or down, firmware code on
> the GPU or in the host's BIOS?
Sometimes the BIOS, but definitely unconditionally the PCI quirk code:
https://github.com/torvalds/linux/blob/master/drivers/pci/quirks.c#L5289
(CC Aaron Plattner)
>
> Ideally, we should try to find out how to control HDA power from the
> operating system rather than trying to cooperate with whatever firmware
> is doing. If we have that capability, the OS should power the HDA up
> and down as it sees fit.
>
> Thanks,
>
> Lukas
>
next prev parent reply other threads:[~2021-04-10 20:48 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20201214060621.1102931-1-kai.heng.feng@canonical.com>
[not found] ` <20201216124726.2842197-1-kai.heng.feng@canonical.com>
[not found] ` <s5h5z51oj12.wl-tiwai@suse.de>
[not found] ` <CAAd53p6kORC1GsW5zt+=0=J5ki43iriO-OqtFvf5W67LWhyyhA@mail.gmail.com>
[not found] ` <s5hzh2dn3oa.wl-tiwai@suse.de>
[not found] ` <CAAd53p6Ef2zFX_t3y1c6O7BmHnxYGtGSfgzXAMQSom1ainWXzg@mail.gmail.com>
[not found] ` <s5hsg85n2km.wl-tiwai@suse.de>
[not found] ` <s5hmtydn0yg.wl-tiwai@suse.de>
2020-12-18 5:09 ` [PATCH v2] ALSA: hda: Continue to probe when codec probe fails Kai-Heng Feng
2020-12-18 8:06 ` Takashi Iwai
2020-12-21 16:33 ` Kai-Heng Feng
2020-12-21 16:47 ` Takashi Iwai
2020-12-21 17:15 ` Kai-Heng Feng
2020-12-21 17:56 ` [Nouveau] " Ilia Mirkin
2020-12-22 2:49 ` Kai-Heng Feng
2021-01-04 13:20 ` Karol Herbst
2021-04-10 15:51 ` Roy Spliet
2021-04-10 19:23 ` Lukas Wunner
2021-04-10 20:48 ` Roy Spliet [this message]
2021-04-12 19:06 ` Aaron Plattner
2021-04-12 19:36 ` Roy Spliet
2021-04-12 20:00 ` Aaron Plattner
2021-04-12 20:03 ` Ilia Mirkin
2021-04-13 0:10 ` Karol Herbst
2021-04-13 8:24 ` Roy Spliet
2021-04-13 9:48 ` Karol Herbst
2021-04-13 11:17 ` Roy Spliet
2021-04-13 11:49 ` Karol Herbst
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