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From:   "Rafael J. Wysocki" <rafael@kernel.org>
Date:   Thu, 16 Jan 2020 10:40:08 +0100
Message-ID: <CAJZ5v0iHVzDzS5zZSTWOdy2CCSkyW74+p2-Et0+EcysOvL2CDg@mail.gmail.com>
Subject: Re: [RESEND PATCH] ACPICA: Enable sleep button on ACPI legacy wake
To:     Anchal Agarwal <anchalag@amazon.com>,
        Erik Kaneda <erik.kaneda@intel.com>,
        Robert Moore <robert.moore@intel.com>
Cc:     Rafael Wysocki <rafael.j.wysocki@intel.com>,
        ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Len Brown <lenb@kernel.org>,
        "open list:ACPI COMPONENT ARCHITECTURE (ACPICA)" <devel@acpica.org>,
        "Singh, Balbir" <sblbir@amazon.com>, fllinden@amazon.com
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On Thu, Jan 16, 2020 at 12:26 AM Anchal Agarwal <anchalag@amazon.com> wrote:
>
> Currently we do not see sleep_enable bit set after guest resumes
> from hibernation. Hibernation is triggered in guest on receiving
> a sleep trigger from the hypervisor(S4 state). We see that power
> button is enabled on wake up from S4 state however sleep button
> isn't. This causes subsequent invocation of sleep state to fail
> in the guest. Any environment  going through acpi_hw_legacy_wake()
> won't have sleep button enabled.
>
> Signed-off-by: Anchal Agarwal <anchalag@amazon.com>
> Reviewed-by: Balbir Singh <sblbir@amazon.com>
> Reviewed-by: Frank van der Linden <fllinden@amazon.com>
> ---
>  drivers/acpi/acpica/hwsleep.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> diff --git a/drivers/acpi/acpica/hwsleep.c b/drivers/acpi/acpica/hwsleep.c
> index b62db8ec446f..a176c7802760 100644
> --- a/drivers/acpi/acpica/hwsleep.c
> +++ b/drivers/acpi/acpica/hwsleep.c
> @@ -300,6 +300,17 @@ acpi_status acpi_hw_legacy_wake(u8 sleep_state)
>                                     [ACPI_EVENT_POWER_BUTTON].
>                                     status_register_id, ACPI_CLEAR_STATUS);
>
> +       /* Enable sleep button */
> +       (void)
> +             acpi_write_bit_register(acpi_gbl_fixed_event_info
> +                                     [ACPI_EVENT_SLEEP_BUTTON].
> +                                     enable_register_id, ACPI_ENABLE_EVENT);
> +
> +       (void)
> +             acpi_write_bit_register(acpi_gbl_fixed_event_info
> +                                     [ACPI_EVENT_SLEEP_BUTTON].
> +                                     status_register_id, ACPI_CLEAR_STATUS);
> +
>         acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, ACPI_SST_WORKING);
>         return_ACPI_STATUS(status);
>  }

Erik, Bob, please pick this up if you don't have specific objections against it.

I'll wait for it to show up in an upstream release.