[Bug 1867704] Re: alsa/hdmi: support nvidia mst hdmi/dp audio

For your testing, what is the difference between -47 and -48?

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https://bugs.launchpad.net/bugs/1867704

Title:
alsa/hdmi: support nvidia mst hdmi/dp audio

Status in HWE Next:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Status in linux-oem package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
Won't Fix
Status in linux-oem source package in Bionic:
Fix Released
Status in linux source package in Focal:
Fix Released

Bug description:
This is the justification for focal:

This patchset will introduce a big change on hda_jack and hda_hdmi,
So I sent the patcheset to oem-b 4 months ago. After 4 months of running
oem-b kernel, there is no any regression reported on this patchset,
now I am backporting the patchset to our focal kernel since our oem
project is waiting for the patchset to be landed to ubuntu 5.4 kernel
ASAP.

This patchset are already merged to mainline kernel 5.5-rc and 5.6-rc,
so there is no need to send the patchset to oem-5.6 or groovy kernel.

[Impact]
On some LENOVO I+N machines, when setting the graphic mode to discrete,
The dp/hdmi audio on the Docking Gen2 can't work with this machine +
LENOVO Docking Gen2, users can't find the hdmi audio entry in the
gnome-sound-setting.

[Fix]
Nvidia developer submit the mst audio support to 5.5-rcN and 5.6-RC1,
those patches could fix this issue.

[Test Case]
set the machien to discrete, plug the dock gen2 to it, then boot, after
booting, plug hdmi or dp to dock gen2, the hdmi or dp audio works.

test other machines without Nvidia graphic or without gen2, their hdmi/dp
audio still work, and check other output/input devices like headphone,
microphone, they all worked as well as before.

[Regression Risk]
one regression possibility is the audio jacks (including analogue and hdmi)
can't work anymore, that means after users plug a headphone, headset, hdmi
monitor or microphone to the audio jacks or hdmi connectors, the audio
driver can't detect the plugging event.

But regression's possibility is very low:
 - this patchset was already applied to oem-b kernel for 4 months, and
   oem projects didn't report any regression on the patchset
 - I tested the testing focal kernel with this patchset on many machines,
   includes a dell hda audio machine, a dell dmic machine, a Lenovo I+N
   hda audio machine, a lenovo I+N dmic machine, a lenovo I hda audio
   machine, a lenovo amd hda audio machine. The audio on them all worked
   as well as before.

This is the justification for oem-b

Drop the B, so far only need to merge this patchset to OEM-B first,
After the patchset is widely verified with oem-b kernel, I send the
patchset to B and F then.

This patchset will add support of mst audio for nvidia hdmi/dp, this
patchset changes lots of common code on hda_jack and hdmi codec, so it
is not easy to say it is 100% safe for other machines, but our oem
project needs this patchset to be backported to ubuntu kernel, because
the tight sechdule of oem project, we backport this patchset to B and
OEM-B first, if the hdmi audio works well for a period of time after
this patchset is merged, I will backport this patchset to focal, maybe
eoan as well.

[Impact]
On some LENOVO I+N machines, when setting the graphic mode to discrete,
The dp/hdmi audio on the Docking Gen2 can't work with this machine +
LENOVO Docking Gen2

[Fix]
Nvidia developer submit the mst audio support to 5.5-rcN and 5.6-RC1,
those patches could fix this issue.

[Test Case]
set the machien to discrete, plug the dock gen2 to it, then boot, after
booting, plug hdmi or dp to dock gen2, the hdmi or dp audio works.

test other machines without Nvidia graphic or without gen2, their hdmi/dp
audio still work.

[Regression Risk]
Low, those patches come from mainline kernel, I have tested those patches
on the machiens with or without nvidia hdmi, and on the machines with or without
docks, all worked well as before.

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