[SRU][Focal][PATCH 0/9] alsa/hdmi: support nvidia mst hdmi/dp audio

[Hui Wang]

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

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.


Kai Vehmanen (3):
  ALSA: hda: hdmi - fix regression in connect list handling
  ALSA: hda: hdmi - fix kernel oops caused by invalid PCM idx
  ALSA: hda: hdmi - preserve non-MST PCM routing for Intel platforms

Nikhil Mahale (5):
  ALSA: hda - Rename snd_hda_pin_sense to snd_hda_jack_pin_sense
  ALSA: hda - Add DP-MST jack support
  ALSA: hda - Add DP-MST support for non-acomp codecs
  ALSA: hda - Add DP-MST support for NVIDIA codecs
  ALSA: hda - Fix DP-MST support for NVIDIA codecs

Takashi Iwai (1):
  ALSA: hda: hdmi - Keep old slot assignment behavior for Intel
    platforms

 sound/pci/hda/hda_jack.c   | 151 ++++++++++-----
 sound/pci/hda/hda_jack.h   | 107 +++++++++--
 sound/pci/hda/patch_hdmi.c | 384 ++++++++++++++++++++++++-------------
 3 files changed, 455 insertions(+), 187 deletions(-)

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2.17.1