** Changed in: linux-oem-5.14 (Ubuntu Focal)
Assignee: Alex Hung (alexhung) => (unassigned)
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https://bugs.launchpad.net/bugs/1961121
Title:
Not able to enter s2idle state on AMD platforms
Status in HWE Next:
In Progress
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-5.14 package in Ubuntu:
Invalid
Status in linux source package in Focal:
Invalid
Status in linux-oem-5.14 source package in Focal:
Fix Committed
Status in linux source package in Jammy:
In Progress
Status in linux-oem-5.14 source package in Jammy:
Invalid
Bug description:
[Impact]
AMD Systems don't enter PC6 at runtime and cause failures to enter
s2idle.
Currently the fix is from kernel driver rather than MP2 firmware,
which disable interrupts from kernel driver to fix MP2 firmware
blocking CPUOFF.
[Fix]
The fixes involve 1) cancelling delayed work when entering s0ix and
re-scheduling it when resuming from s0ix, and 2) clearing interrupts
during the driver initialization and sensor command operations.
[Test]
This is requested by AMD and was tested on AMD CRB.
[Where problems could occur]
Risk is low to medium. Some code flow changes are guarded by
reasonable conditions, but the fixes introduced additional suspend and
resume operations.
Having said that, clearing interrupts before driver initialization and
cancelling work before entering sleeping states are standard
approaches are usually safe.
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