Re: [PATCH v2] ACPI: Evaluate _PS3 when entering D3 Cold

["Rafael J. Wysocki" <rjw@sisk.pl>]

On Wednesday, April 25, 2012, Aaron Lu wrote:
> V2: set D3 Cold's explicit_set flag in acpi_bus_get_power_flags if _PS3
> exists as suggested by Rafael and modify the way to change object_name
> to _PS3 from _PS4 when doing explicit set to enter D3 Cold.
> The patch is based on top of Lin Ming's ACPI D3 clean up patch.
> 
> V1: When entering D3 Cold from a lower device power state(higher power),
> evaluate _PS3 before doing power transition.
> 
> Signed-off-by: Aaron Lu <aaron.lu@amd.com>
> Cc: Andiry Xu <andiry.xu@amd.com>
> Cc: Alex He <alex.he@amd.com>

Reviewed-by: Rafael J. Wysocki <rjw@sisk.pl>

> ---
>  drivers/acpi/bus.c  |    3 +++
>  drivers/acpi/scan.c |    4 ++++
>  2 files changed, 7 insertions(+)
> 
> diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
> index 3263b68..3a7860f 100644
> --- a/drivers/acpi/bus.c
> +++ b/drivers/acpi/bus.c
> @@ -273,6 +273,9 @@ static int __acpi_bus_set_power(struct acpi_device *device, int state)
>  		}
>  	} else {
>  		if (device->power.states[state].flags.explicit_set) {
> +			/* Evaluate _PS3 when entering D3cold */
> +			if (state == ACPI_STATE_D3)
> +				object_name[3] = '3';
>  			status = acpi_evaluate_object(device->handle,
>  						      object_name, NULL, NULL);
>  			if (ACPI_FAILURE(status)) {
> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> index 7417267..27906d0 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -908,6 +908,10 @@ static int acpi_bus_get_power_flags(struct acpi_device *device)
>  	device->power.states[ACPI_STATE_D3].flags.valid = 1;
>  	device->power.states[ACPI_STATE_D3].power = 0;
>  
> +	/* Also set D3cold's explicit flag when _PS3 exists */
> +	if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
> +		device->power.states[ACPI_STATE_D3].flags.explicit_set = 1;
> +
>  	acpi_bus_init_power(device);
>  
>  	return 0;
>