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H A D | processor_idle.c | bfe55a1f Wed Feb 09 15:05:09 CST 2022 Woody Suwalski <wsuwalski@gmail.com> ACPI: processor: idle: fix lockup regression on 32-bit ThinkPad T40
Add and ACPI idle power level limit for 32-bit ThinkPad T40.
There is a regression on T40 introduced by commit d6b88ce2, starting with kernel 5.16:
commit d6b88ce2eb9d2698eb24451eb92c0a1649b17bb1 Author: Richard Gong <richard.gong@amd.com> Date: Wed Sep 22 08:31:16 2021 -0500
ACPI: processor idle: Allow playing dead in C3 state
The above patch is trying to enter C3 state during init, what is causing a T40 system freeze. I have not found a similar issue on any other of my 32-bit machines.
The fix is to add another exception to the processor_power_dmi_table[] list. As a result the dmesg shows as expected:
[2.155398] ACPI: IBM ThinkPad T40 detected - limiting to C2 max_cstate. Override with "processor.max_cstate=9" [2.155404] ACPI: processor limited to max C-state 2
The fix is trivial and affects only vintage T40 systems.
Fixes: d6b88ce2eb9d ("CPI: processor idle: Allow playing dead in C3 state") Signed-off-by: Woody Suwalski <wsuwalski@gmail.com> Reviewed-by: Hans de Goede <hdegoede@redhat.com> Cc: 5.16+ <stable@vger.kernel.org> # 5.16+ [ rjw: New subject ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> d6b88ce2 Wed Sep 22 08:31:16 CDT 2021 Richard Gong <richard.gong@amd.com> ACPI: processor idle: Allow playing dead in C3 state
When some cores are disabled on AMD platforms, the system will no longer be able to enter suspend-to-idle s0ix.
Update to allow playing dead in C3 state so that the CPUs can enter the deepest state on AMD platforms.
BugLink: https://gitlab.freedesktop.org/drm/amd/-/issues/1708 Suggested-by: Mario Limonciello <mario.limonciello@amd.com> Signed-off-by: Richard Gong <richard.gong@amd.com> [ rjw: Fixed coding style ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> ff810f85 Wed Feb 09 15:05:09 CST 2022 Woody Suwalski <wsuwalski@gmail.com> ACPI: processor: idle: fix lockup regression on 32-bit ThinkPad T40
commit bfe55a1f7fd6bfede16078bf04c6250fbca11588 upstream.
Add and ACPI idle power level limit for 32-bit ThinkPad T40.
There is a regression on T40 introduced by commit d6b88ce2, starting with kernel 5.16:
commit d6b88ce2eb9d2698eb24451eb92c0a1649b17bb1 Author: Richard Gong <richard.gong@amd.com> Date: Wed Sep 22 08:31:16 2021 -0500
ACPI: processor idle: Allow playing dead in C3 state
The above patch is trying to enter C3 state during init, what is causing a T40 system freeze. I have not found a similar issue on any other of my 32-bit machines.
The fix is to add another exception to the processor_power_dmi_table[] list. As a result the dmesg shows as expected:
[2.155398] ACPI: IBM ThinkPad T40 detected - limiting to C2 max_cstate. Override with "processor.max_cstate=9" [2.155404] ACPI: processor limited to max C-state 2
The fix is trivial and affects only vintage T40 systems.
Fixes: d6b88ce2eb9d ("CPI: processor idle: Allow playing dead in C3 state") Signed-off-by: Woody Suwalski <wsuwalski@gmail.com> Reviewed-by: Hans de Goede <hdegoede@redhat.com> Cc: 5.16+ <stable@vger.kernel.org> # 5.16+ [ rjw: New subject ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Cc: "Limonciello, Mario" <Mario.Limonciello@amd.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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