[SRU][OEM-5.6][PATCH 0/1] alsa: should not load sof driver if the internal mic connects to the codec

[Hui Wang]

BugLink: https://bugs.launchpad.net/bugs/1890231

This issue was introduced by #1872916 ("Support Intel Soundwire
in 5.6-OEM Kernel 20.04"), so focal and groovy kernels don't need
this fix.

[Impact]
We found the sof driver instead of hda driver is enabled on a dell
machine without soundwire and dmic. This will make gnome show dummy
output and users have no audio device to use.

[Fix]
When we integrated fix for #1872916, we backported 2 patches, these
2 patches enable the sof driver unconditionally for Dell comet lake
machines. There is an upstream patch to fix it, let the sof driver
enable conditionally on comet lake machines.

[Test Case]
Boot the kernel with this patch on that dell machine, check the
gnome-control-center, all audio devices exist, playback and recording
work well.

[Regression Risk]
On the Dell comet lake machines with dmic, the sof driver should
enable. Without this patch, the sof driver will enable unconditionally,
but with this patch, the sof driver will enable conditionally, so it
is possible to introduce a regression that on Dell comet machines,
the sof driver doesn't enable even the machine has dmic.

I have tested this patch on a Dell comet lake dmic machines, it worked
well.


Pierre-Louis Bossart (1):
  ALSA: hda: add autodetection for SoundWire

 sound/hda/intel-dsp-config.c | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

-- 
2.17.1