Re: [PATCH] ACPICA: Clear status of all events when entering S5

From: "Rafael J. Wysocki" <rafael@kernel.org>
To: "Schmauss, Erik" <erik.schmauss@intel.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
	"Linux ACPI" <linux-acpi@vger.kernel.org>,
	"Thomas Hänig" <haenig@cosifan.de>,
	"Takashi Iwai" <tiwai@suse.de>,
	"Linux PM" <linux-pm@vger.kernel.org>,
	"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] ACPICA: Clear status of all events when entering S5
Date: Tue, 17 Jul 2018 09:23:23 +0200	[thread overview]
Message-ID: <CAJZ5v0gzK6bbQvmbhBwcTapC_DNR5wkxAymNQAs1_E4ESfXxFw@mail.gmail.com> (raw)
In-Reply-To: <CF6A88132359CE47947DB4C6E1709ED53BB4D759@ORSMSX110.amr.corp.intel.com>

On Mon, Jul 16, 2018 at 7:59 PM, Schmauss, Erik <erik.schmauss@intel.com> wrote:
>
>> -----Original Message-----
>> From: Rafael J. Wysocki [mailto:rjw@rjwysocki.net]
>> Sent: Sunday, July 8, 2018 2:10 AM
>> To: Linux ACPI <linux-acpi@vger.kernel.org>
>> Cc: Thomas Hänig <haenig@cosifan.de>; Takashi Iwai <tiwai@suse.de>;
>> Schmauss, Erik <erik.schmauss@intel.com>; Linux PM <linux-
>> pm@vger.kernel.org>; Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
>> Subject: [PATCH] ACPICA: Clear status of all events when entering S5
>>
>> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
>>
>> After commit 18996f2db918 (ACPICA: Events: Stop unconditionally clearing ACPI
>> IRQs during suspend/resume) the status of ACPI events is not cleared any more
>> when entering the ACPI S5 system state (power
>> off) which causes some systems to power up immediately after turing off power
>> in certain situations.
>>
>> That is a functional regression, so address it by making the code clear the status
>> of all ACPI events again when entering S5 (for system-wide suspend or
>> hibernation the clearing of the status of all events is not desirable, as it might
>> cause the kernel to miss wakeup events sometimes).
>>
>> Fixes: 18996f2db918 (ACPICA: Events: Stop unconditionally clearing ACPI IRQs
>> during suspend/resume)
>> Reported-by: Takashi Iwai <tiwai@suse.de>
>> Tested-by: Thomas Hänig <haenig@cosifan.de>
>> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
>> ---
>>
>> Resend https://patchwork.kernel.org/patch/10511451/ with a changelig and
>> tags.
>>
>> ---
>>  drivers/acpi/acpica/hwsleep.c |   15 +++++++++++----
>>  1 file changed, 11 insertions(+), 4 deletions(-)
>>
>> Index: linux-pm/drivers/acpi/acpica/hwsleep.c
>> =================================================================
>> ==
>> --- linux-pm.orig/drivers/acpi/acpica/hwsleep.c
>> +++ linux-pm/drivers/acpi/acpica/hwsleep.c
>> @@ -51,16 +51,23 @@ acpi_status acpi_hw_legacy_sleep(u8 slee
>>               return_ACPI_STATUS(status);
>>       }
>>
>> -     /*
>> -      * 1) Disable all GPEs
>> -      * 2) Enable all wakeup GPEs
>> -      */
>> +     /* Disable all GPEs */
>>       status = acpi_hw_disable_all_gpes();
>>       if (ACPI_FAILURE(status)) {
>>               return_ACPI_STATUS(status);
>>       }
>> +     /*
>> +      * If the target sleep state is S5, clear all GPEs and fixed events too
>> +      */
>> +     if (sleep_state == ACPI_STATE_S5) {
>> +             status = acpi_hw_clear_acpi_status();
>> +             if (ACPI_FAILURE(status)) {
>> +                     return_ACPI_STATUS(status);
>> +             }
>> +     }
>>       acpi_gbl_system_awake_and_running = FALSE;
>>
>> +      /* Enable all wakeup GPEs */
>>       status = acpi_hw_enable_all_wakeup_gpes();
>>       if (ACPI_FAILURE(status)) {
>>               return_ACPI_STATUS(status);
>
> Rafael, I've created an ACPICA pull request containing this patch.

OK, thanks!

The patch is in the mainline kernel tree already at this point, so
that's an upstream only thing.

Can you please also do likewise for
https://patchwork.kernel.org/patch/10495943/ ?

Thanks,
Rafael