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