linux-kernel - Re: [PATCH] PCI: Set device power state to PCI

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Date:	Thu, 6 Oct 2011 09:10:05 -0700
From:	Yinghai Lu <yhlu.kernel@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Ajaykumar Hotchandani <ajaykumar.hotchandani@...cle.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: Set device power state to PCI_D0 for device without
 native PM support

On Wed, Oct 5, 2011 at 12:41 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> Hi,
>>   drivers/pci/pci.c |    3 +++
>>   1 files changed, 3 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
>> index e9651f0..ca8c82d 100644
>> --- a/drivers/pci/pci.c
>> +++ b/drivers/pci/pci.c
>> @@ -664,6 +664,9 @@ static int pci_platform_power_transition(struct pci_dev *dev, pci_power_t state)
>>                  error = platform_pci_set_power_state(dev, state);
>>                  if (!error)
>>                          pci_update_current_state(dev, state);
>> +               /* Fall back to PCI_D0 if native PM is not supported */
>> +               else if (!dev->pm_cap)
>> +                       dev->current_state = PCI_D0;
>>          } else {
>>                  error = -ENODEV;
>>                  /* Fall back to PCI_D0 if native PM is not supported */
>>
>
> I have some vague memories that we tried that and it broke something.

Do have any hint for us to dig out the configuration for failing?

>
> How thoroughly has it been tested?

tested in setups with intel cpus from Nehalem.

Yinghai
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