linux-kernel - Re: [PATCH 1/6] ACPI: D3cold state is always valid

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Date:	Tue, 17 Apr 2012 22:29:18 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	Len Brown <lenb@...nel.og>, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, Zhang Rui <rui.zhang@...el.com>,
	Huang Ying <huang.ying.caritas@...il.com>,
	Aaron Lu <aaron.lu@....com>
Subject: Re: [PATCH 1/6] ACPI: D3cold state is always valid

On Tuesday, April 17, 2012, Lin Ming wrote:
> ACPI_STATE_D3 actually means ACPI D3hot which is not always valid.
> Instead, ACPI D3cold is always valid.
> 
> Signed-off-by: Lin Ming <ming.m.lin@...el.com>

Can you just introduce ACPI_STATE_D3_HOT and redefine D3_COLD so that
it's the same as D3, as I said?

Rafael


> ---
>  drivers/acpi/scan.c |   11 ++---------
>  1 files changed, 2 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> index 767e2dc..fb56388 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -884,13 +884,6 @@ static int acpi_bus_get_power_flags(struct acpi_device *device)
>  				acpi_bus_add_power_resource(ps->resources.handles[j]);
>  		}
>  
> -		/* The exist of _PR3 indicates D3Cold support */
> -		if (i == ACPI_STATE_D3) {
> -			status = acpi_get_handle(device->handle, object_name, &handle);
> -			if (ACPI_SUCCESS(status))
> -				device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
> -		}
> -
>  		/* Evaluate "_PSx" to see if we can do explicit sets */
>  		object_name[2] = 'S';
>  		status = acpi_get_handle(device->handle, object_name, &handle);
> @@ -908,8 +901,8 @@ static int acpi_bus_get_power_flags(struct acpi_device *device)
>  	/* Set defaults for D0 and D3 states (always valid) */
>  	device->power.states[ACPI_STATE_D0].flags.valid = 1;
>  	device->power.states[ACPI_STATE_D0].power = 100;
> -	device->power.states[ACPI_STATE_D3].flags.valid = 1;
> -	device->power.states[ACPI_STATE_D3].power = 0;
> +	device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
> +	device->power.states[ACPI_STATE_D3_COLD].power = 0;
>  
>  	acpi_bus_init_power(device);
>  
> 

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