[alsa-devel] [PATCH v1 0/5] ALSA: hda - Add DP-MST support for NVIDIA codecs

[Takashi Iwai]

On Thu, 14 Nov 2019 04:36:59 +0100,
Nikhil Mahale wrote:
> 
> Today, DisplayPort multi-stream transport (DP-MST) audio is not
> supported on codec drivers which don't use the audio component
> (acomp) binding.
> 
> The commit ade49db337a9 (ALSA: hda/hdmi - Allow audio component for
> AMD/ATI and Nvidia HDMI) added the DRM audio component binding for
> the NVIDIA codec drivers, but the traditional HD-audio unsolicited
> event code path is still in use by the proprietary NVIDIA graphics
> driver.
> 
> This patch set adds DP-MST audio support for non-acomp codec drivers
> which use the traditional HD-audio unsolicited event code path. This
> patch set adds DP-MST support for NVIDIA codecs.
> 
> The patch set has been tested for HDMI/DP-SST/DP-MST(4 dp-mst audio
> streams) configurations on NVIDIA Kepler and Maxwell GPUs, using
> both the nouveau driver and the proprietary NVIDIA graphics driver.

Thanks for the patch.  The logic looks good, but there are a few
concerns in implementation details.  Will comment in the reply of each
patch.

The timing is a bit late for merging into 5.5, though, for this kind
of non-trivial changes.  It'll be likely applied after 5.5 merge
window, so for 5.6.


Takashi