[PATCH] platform/x86: Add missing LPS0 functions for AMD

[Hans de Goede]

Hi,

On 5/5/21 3:11 PM, Alex Deucher wrote:
> On Wed, May 5, 2021 at 9:10 AM Hans de Goede <hdegoede at redhat.com> wrote:
>>
>> Hi,
>>
>> On 5/5/21 12:33 AM, Limonciello, Mario wrote:
>>> [AMD Public Use]
>>>
>>>> Subject: [PATCH] platform/x86: Add missing LPS0 functions for AMD
>>>
>>> Rafael might be willing to fix it up on commit, but if you end up needing to re-spin
>>> I think technically this subsystem prefix to match other stuff committed to this file
>>> should be:
>>>
>>> "ACPI: PM: s2idle:"
>>
>> Ack, please get the subject next right time. I was about the put this in a folder
>> with patches to apply to the pdx86 kernel tree once 5.13-rc1 is out, but this
>> should not go upstream through the pdx86 tree at all.
> 
> Do you want me to resend with the corrected subject?  What tree does
> this need to go through?

That might be helpful, I think that like how to subject made me
think "Oh I need to pick this one up" it will probably to the
opposite for Rafael.

It should go through Rafael's ACPI/PM tree:

[hans at x1 linux]$ scripts/get_maintainer.pl -f drivers/acpi/x86/s2idle.c
"Rafael J. Wysocki" <rjw at rjwysocki.net> (supporter:ACPI)
Len Brown <lenb at kernel.org> (supporter:ACPI)
linux-acpi at vger.kernel.org (open list:ACPI)
linux-kernel at vger.kernel.org (open list)

Regards,

Hans



>>>> These are supposedly not required for AMD platforms,
>>>> but at least some HP laptops seem to require it to
>>>> properly turn off the keyboard backlight.
>>>>
>>>> Based on a patch from Marcin Bachry <hegel666 at gmail.com>.
>>>>
>>>> Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1230
>>>> Reviewed-by: Hans de Goede <hdegoede at redhat.com>
>>>> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
>>>> Cc: Marcin Bachry <hegel666 at gmail.com>
>>>> Cc: Mario Limonciello <mario.limonciello at amd.com>
>>>> ---
>>>>
>>>> Dropping patch 2/2 for now.  This patch fixes several
>>>> systems and doesn't appear to cause any issues.
>>>>
>>>>  drivers/acpi/x86/s2idle.c | 4 ++++
>>>>  1 file changed, 4 insertions(+)
>>>>
>>>> diff --git a/drivers/acpi/x86/s2idle.c b/drivers/acpi/x86/s2idle.c
>>>> index 2b69536cdccb..2d7ddb8a8cb6 100644
>>>> --- a/drivers/acpi/x86/s2idle.c
>>>> +++ b/drivers/acpi/x86/s2idle.c
>>>> @@ -42,6 +42,8 @@ static const struct acpi_device_id lps0_device_ids[] = {
>>>>
>>>>  /* AMD */
>>>>  #define ACPI_LPS0_DSM_UUID_AMD      "e3f32452-febc-43ce-9039-
>>>> 932122d37721"
>>>> +#define ACPI_LPS0_ENTRY_AMD         2
>>>> +#define ACPI_LPS0_EXIT_AMD          3
>>>>  #define ACPI_LPS0_SCREEN_OFF_AMD    4
>>>>  #define ACPI_LPS0_SCREEN_ON_AMD     5
>>>>
>>>> @@ -408,6 +410,7 @@ int acpi_s2idle_prepare_late(void)
>>>>
>>>>      if (acpi_s2idle_vendor_amd()) {
>>>>              acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF_AMD);
>>>> +            acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY_AMD);
>>>>      } else {
>>>>              acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF);
>>>>              acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY);
>>>> @@ -422,6 +425,7 @@ void acpi_s2idle_restore_early(void)
>>>>              return;
>>>>
>>>>      if (acpi_s2idle_vendor_amd()) {
>>>> +            acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT_AMD);
>>>>              acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON_AMD);
>>>>      } else {
>>>>              acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT);
>>>> --
>>>> 2.30.2
>>>
>>
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>