alsa: should not load sof driver if the internal mic connects to the codec

[Hui Wang]

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 Dell Comet Lake machines with DMIC, the sof driver should be
enabled. Without this patch, the sof driver will be enabled unconditionally, but with this patch, the sof driver will be enabled conditionally, so it is possible to introduce a regression that on Dell Comet Lake machines, the sof driver is not enabled even the machine has DMIC.

I have tested this patch on a Dell Comet Lake dmic machines, it worked
well.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-focal' to 'verification-done-focal'. If the problem still exists, change the tag 'verification-needed-focal' to 'verification-failed-focal'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Hui Wang (hui.wang)]

Install the proposed kernel on the machine, the audio driver works well.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-oem-5.6 - 5.6.0-1023.23

---------------
linux-oem-5.6 (5.6.0-1023.23) focal; urgency=medium

  * focal/linux-oem-5.6: 5.6.0-1023.23 -proposed tracker (LP: #1892465)

  * CVE-2020-15852
    - x86/ioperm: Fix io bitmap invalidation on Xen PV

  * Fix non-working USB devices plugged during system sleep (LP: #1892678)
    - xhci: Do warm-reset when both CAS and XDEV_RESUME are set

  * ASPM not enabled on child devices behind VMD controller (LP: #1889384)
    - SAUCE: PCI/ASPM: Enable ASPM for links under VMD domain

  * Fix non-working Goodix touchpad after system sleep (LP: #1891998)
    - HID: i2c-hid: Always sleep 60ms after I2C_HID_PWR_ON commands

  * [SRU] Fix acpi backlight issue on some thinkpads (LP: #1892010)
    - platform/x86: thinkpad_acpi: not loading brightness_init when _BCL invalid

  * Packaging resync (LP: #1786013)
    - [Packaging] update helper scripts

 -- Timo Aaltonen <email address hidden> Tue, 25 Aug 2020 08:46:08 +0300