Public bug reported:
[Impact]
SOF driver in oem-5.6 kernel tries to access HDA codec register when the
codec is already suspended. This may freeze suspend.
[Fix]
Revert HDA codec PM direct-complete optimization.
The same suspend optimization works perfectly on 5.8 and 5.10 kernel, so
something's wrong in the SOF driver in oem-5.6. However, SOF in oem-5.6
is in Frankenstein state so we better not touch it.
[Test]
Suspend a laptop with SOF driver, it can take 30 seconds to suspend, or
worse, it freezes.
With the patch applied, it can suspend in 1 second.
[Regression Risk]
For HDA codecs that benefit from this PM optimization, it'll take longer
to suspend and resume. Nothing else changes other than that.
** Affects: hwe-next
Importance: Undecided
Status: New
** Affects: linux-oem-5.6 (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux-oem-5.6 (Ubuntu Focal)
Importance: High
Status: Confirmed
** Tags: oem-priority originate-from-1908495 stella
** Also affects: linux-oem-5.6 (Ubuntu Focal)
Importance: Undecided
Status: New
** Changed in: linux-oem-5.6 (Ubuntu)
Status: New => Invalid
** Changed in: linux-oem-5.6 (Ubuntu Focal)
Status: New => Confirmed
** Changed in: linux-oem-5.6 (Ubuntu Focal)
Importance: Undecided => High
** Tags added: oem-priority originate-from-1908495 stella
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https://bugs.launchpad.net/bugs/1908713
Title:
Fix suspend error of SOF driver
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