[SRU] [H/U/OEM-5.10] [PATCH 0/2] Fix mic on P620 after S3 resume

[Kai-Heng Feng]

BugLink: https://bugs.launchpad.net/bugs/1921757

[Impact]
Mic on Lenovo P620 can not record any sound after S3.

[Fix]
Query the connector status on system resume.

[Test]
Use "arecord | aplay" to test.
With the fix in place, the mic in question works after S3 resume.
Also tested on some other USB audio and didn't find any issue.

[Where problems could occur]
If there's a USB audio device that doesn't like its connectors being
queried, then this may regress on those devices.
However I suspect this is the default behavior on other OSes, so it's
unlikely to happen.

Kai-Heng Feng (2):
  ALSA: usb-audio: Carve out connector value checking into a helper
  ALSA: usb-audio: Check connector value on resume

 sound/usb/mixer.c        | 78 ++++++++++++++++++++++++++++++----------
 sound/usb/mixer.h        |  1 +
 sound/usb/mixer_quirks.c |  2 +-
 3 files changed, 61 insertions(+), 20 deletions(-)

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2.30.2