From mboxrd@z Thu Jan  1 00:00:00 1970
From: Lin Ming <ming.m.lin@intel.com>
Subject: Re: [RFC PATCH] PCIe: Add PCIe runtime D3cold support
Date: Mon, 16 Apr 2012 08:48:31 +0800
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References: <4F8790F6.5080408@intel.com>  <201204132141.58063.rjw@sisk.pl>
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To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: "Yan, Zheng" <zheng.z.yan@intel.com>, bhelgaas@google.com, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, Zhang Rui <rui.zhang@intel.com>, huang ying <huang.ying.caritas@gmail.com>, ACPI Devel Mailing List <linux-acpi@vger.kernel.org>
List-Id: linux-acpi@vger.kernel.org

On Fri, 2012-04-13 at 21:41 +0200, Rafael J. Wysocki wrote:
> Hi,
> 
> On Friday, April 13, 2012, Yan, Zheng wrote:
> > Hi all,
> > 
> > This patch adds PCIe runtime D3cold support, namely cut power supply for functions
> > beneath a PCIe port when they all have entered D3. A device in D3cold can only
> > generate wake event through the WAKE# pin. Because we can not access to a device's
> > configure space while it's in D3cold, pme_poll is disabled for devices in D3cold.
> > 
> > Any comment will be appreciated.
> > 
> > Signed-off-by: Zheng Yan <zheng.z.yan@intel.com>
> > ---
> > diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
> > index 0f150f2..e210e8cb 100644
> > --- a/drivers/pci/pci-acpi.c
> > +++ b/drivers/pci/pci-acpi.c
> > @@ -224,7 +224,7 @@ static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
> >  		[PCI_D1] = ACPI_STATE_D1,
> >  		[PCI_D2] = ACPI_STATE_D2,
> >  		[PCI_D3hot] = ACPI_STATE_D3,
> > -		[PCI_D3cold] = ACPI_STATE_D3
> > +		[PCI_D3cold] = ACPI_STATE_D3_COLD
> >  	};
> >  	int error = -EINVAL;
> >  
> 
> Please don't use that ACPI_STATE_D3_COLD thing, it's not defined correctly.
> 
> We should define ACPI_STATE_D3_COLD == ACPI_STATE_D3 and add ACPI_STATE_D3_HOT
> instead.  I'll prepare a patch for that over the weekend if no one has done
> that already.

Hi Rafael,

Have you started to write the patch?

If not, I can do it.

Thanks,
Lin Ming