linux-kernel - Re: [PATCH] ACPI: PM: s2idle: Add missing LPS0 functions for AMD

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Date:   Mon, 17 May 2021 16:24:05 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Alex Deucher <alexander.deucher@....com>
Cc:     amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Prike Liang <Prike.Liang@....com>,
        Shyam Sundar S K <Shyam-sundar.S-k@....com>,
        Marcin Bachry <hegel666@...il.com>,
        Mario Limonciello <mario.limonciello@....com>
Subject: Re: [PATCH] ACPI: PM: s2idle: Add missing LPS0 functions for AMD

On Wed, May 5, 2021 at 3:21 PM Alex Deucher <alexander.deucher@....com> wrote:
>
> 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@...il.com>.
>
> Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1230
> Reviewed-by: Hans de Goede <hdegoede@...hat.com>
> Signed-off-by: Alex Deucher <alexander.deucher@....com>
> Cc: Marcin Bachry <hegel666@...il.com>
> Cc: Mario Limonciello <mario.limonciello@....com>
> ---
>
> Resend with updated subject.
>
>  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);
> --

Applied as 5.14 material, thanks!