From: Ilia Mirkin <imirkin@alum.mit.edu>
To: Kai-Heng Feng <kai.heng.feng@canonical.com>
Cc: Takashi Iwai <tiwai@suse.de>,
"moderated list:SOUND" <alsa-devel@alsa-project.org>,
Kai Vehmanen <kai.vehmanen@linux.intel.com>,
nouveau <nouveau@lists.freedesktop.org>,
open list <linux-kernel@vger.kernel.org>,
Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
tiwai@suse.com, Bjorn Helgaas <bhelgaas@google.com>,
Alan Stern <stern@rowland.harvard.edu>,
Linux PCI <linux-pci@vger.kernel.org>,
Alex Deucher <alexander.deucher@amd.com>,
Jaroslav Kysela <perex@perex.cz>, Mike Rapoport <rppt@kernel.org>
Subject: Re: [Nouveau] [PATCH v2] ALSA: hda: Continue to probe when codec probe fails
Date: Mon, 21 Dec 2020 12:56:38 -0500 [thread overview]
Message-ID: <CAKb7UvjWX7xbwMKtnad5EVy16nY1M-A13YJeRWyUwHzemcVswA@mail.gmail.com> (raw)
In-Reply-To: <CAAd53p53w0H6tsb4JgQtFTkYinniicTYBs2uk7tc=heP2dM_Cw@mail.gmail.com>
On Mon, Dec 21, 2020 at 11:33 AM Kai-Heng Feng
<kai.heng.feng@canonical.com> wrote:
>
> [+Cc nouveau]
>
> On Fri, Dec 18, 2020 at 4:06 PM Takashi Iwai <tiwai@suse.de> wrote:
> [snip]
> > > Quite possibly the system doesn't power up HDA controller when there's
> > > no external monitor.
> > > So when it's connected to external monitor, it's still needed for HDMI audio.
> > > Let me ask the user to confirm this.
> >
> > Yeah, it's the basic question whether the HD-audio is supposed to work
> > on this machine at all. If yes, the current approach we take makes
> > less sense - instead we should rather make the HD-audio controller
> > working.
>
> Yea, confirmed that the Nvidia HDA works when HDMI is connected prior boot.
>
> > > > - The second problem is that pci_enable_device() ignores the error
> > > > returned from pci_set_power_state() if it's -EIO. And the
> > > > inaccessible access error returns -EIO, although it's rather a fatal
> > > > problem. So the driver believes as the PCI device gets enabled
> > > > properly.
> > >
> > > This was introduced in 2005, by Alan's 11f3859b1e85 ("[PATCH] PCI: Fix
> > > regression in pci_enable_device_bars") to fix UHCI controller.
> > >
> > > >
> > > > - The third problem is that HD-audio driver blindly believes the
> > > > codec_mask read from the register even if it's a read failure as I
> > > > already showed.
> > >
> > > This approach has least regression risk.
> >
> > Yes, but it assumes that HD-audio is really non-existent.
>
> I really don't know any good approach to address this.
> On Windows, HDA PCI is "hidden" until HDMI cable is plugged, then the
> driver will flag the magic bit to make HDA audio appear on the PCI
> bus.
> IIRC the current approach is to make nouveau and device link work.
I don't have the full context of this discussion, but the kernel
force-enables the HDA subfunction nowadays, irrespective of nouveau or
nvidia or whatever:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/pci/quirks.c?h=v5.10#n5267
Cheers,
-ilia
next prev parent reply other threads:[~2020-12-21 17:57 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 ` Ilia Mirkin [this message]
2020-12-22 2:49 ` [Nouveau] " 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
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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