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

[Stefan Bader]

On 12.08.20 07:58, Hui Wang wrote:
> 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(-)
> 
Acked-by: Stefan Bader <stefan.bader at canonical.com>

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