linux-kernel - Re: [PATCH] ACPI: evaluate

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Date:	Mon, 23 Apr 2012 09:09:31 +0800
From:	Aaron Lu <aaron.lu@....com>
To:	Len Brown <lenb@...nel.org>, "Rafeal J. Wysocki" <rjw@...k.pl>,
	Lin Ming <ming.m.lin@...el.com>
CC:	<linux-acpi@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Zhang Rui <rui.zhang@...el.com>,
	Andiry Xu <andiry.xu@....com>, Alex He <alex.he@....com>
Subject: Re: [PATCH] ACPI: evaluate _PS3 when entering D3 Cold

Hi Rafael and Ming,

Do you have any more comments on this patch?
If not, can I have your ack? Thanks.

-Aaron

On Sun, Apr 01, 2012 at 02:18:30AM +0800, Aaron Lu wrote:
> When entering D3 Cold from a higher device state, evaluate _PS3 first
> and then make the proper power transition.
> This is used to solve the ZPODD problem on AMD's platform, _PS3 on such
> platforms will power off the ODD device and thus make the device enter
> D3 cold state.
> 
> Signed-off-by: Aaron Lu <aaron.lu@....com>
> Cc: Andiry Xu <andiry.xu@....com>
> Cc: Alex He <alex.he@....com>
> ---
>  drivers/acpi/bus.c |   17 ++++++++++++++---
>  1 file changed, 14 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
> index 3263b68..68e593f 100644
> --- a/drivers/acpi/bus.c
> +++ b/drivers/acpi/bus.c
> @@ -227,6 +227,8 @@ static int __acpi_bus_set_power(struct acpi_device *device, int state)
>  	int result = 0;
>  	acpi_status status = AE_OK;
>  	char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
> +	struct acpi_device_power_state *ps;
> +	u8 explicit_set;
>  
>  	if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
>  		return -EINVAL;
> @@ -239,7 +241,8 @@ static int __acpi_bus_set_power(struct acpi_device *device, int state)
>  		return 0;
>  	}
>  
> -	if (!device->power.states[state].flags.valid) {
> +	ps = &device->power.states[state];
> +	if (!ps->flags.valid) {
>  		printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
>  		return -ENODEV;
>  	}
> @@ -263,7 +266,7 @@ static int __acpi_bus_set_power(struct acpi_device *device, int state)
>  			if (result)
>  				goto end;
>  		}
> -		if (device->power.states[state].flags.explicit_set) {
> +		if (ps->flags.explicit_set) {
>  			status = acpi_evaluate_object(device->handle,
>  						      object_name, NULL, NULL);
>  			if (ACPI_FAILURE(status)) {
> @@ -272,7 +275,15 @@ static int __acpi_bus_set_power(struct acpi_device *device, int state)
>  			}
>  		}
>  	} else {
> -		if (device->power.states[state].flags.explicit_set) {
> +		/* If state is D3 Cold, try to evaluate _PS3 first */
> +		if (state == ACPI_STATE_D3_COLD) {
> +			explicit_set = (ps - 1)->flags.explicit_set;
> +			object_name[3] -= 1;
> +		}
> +		else {
> +			explicit_set = ps->flags.explicit_set;
> +		}
> +		if (explicit_set) {
>  			status = acpi_evaluate_object(device->handle,
>  						      object_name, NULL, NULL);
>  			if (ACPI_FAILURE(status)) {
> -- 
> 1.7.9.2.315.g25a78.dirty
> 

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