linux-kernel - Re: [PATCH] pci: Updates to Rafael's runtime PCI PM patch set

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Date:	Wed, 11 Nov 2009 20:58:20 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Matthew Garrett <mjg@...hat.com>
Cc:	linux-pm@...ts.linux-foundation.org, jbarnes@...tuousgeek.org,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	stern@...land.harvard.edu, shaohua.li@...el.com,
	bjorn.helgaas@...com
Subject: Re: [PATCH] pci: Updates to Rafael's runtime PCI PM patch set

On Monday 09 November 2009, Matthew Garrett wrote:
> There's a few quirks with Rafael's PCI runtime PM code - this modifies
> them a little. The body of it is just porting it to my GPE rewrite, but
> it also moves the PCI binding earlier (otherwise acpi_pci_bind bails, since
> it's primarily intended for bridges), and also ensures that the pme bit
> gets set properly on hardware that requires it.

Well, I thought more changes would be necessary. :-)

Looking good, a few comments below.

> Signed-off-by: Matthew Garrett <mjg@...hat.com>
> ---
>  drivers/acpi/pci_bind.c  |   12 ++++++------
>  drivers/acpi/wakeup.c    |   36 ------------------------------------
>  drivers/pci/pci-acpi.c   |   43 ++++++++++++++++---------------------------
>  drivers/pci/pci-driver.c |    6 ++++++
>  include/acpi/acpi_bus.h  |    6 ------
>  5 files changed, 28 insertions(+), 75 deletions(-)
> 
...
> diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
> index eb4f26a..d644db6 100644
> --- a/drivers/pci/pci-driver.c
> +++ b/drivers/pci/pci-driver.c
> @@ -967,6 +967,9 @@ static int pci_pm_runtime_suspend(struct device *dev)
>  			pci_prepare_to_sleep(pci_dev);
>  	}
>  
> +	if (pci_pme_capable(pci_dev, pci_target_state(pci_dev)))
> +		pci_pme_active(pci_dev, true);
> +

The PME was supposed to be turned on by pci_prepare_to_sleep().
I guess it wasn't in practice?

>  	pci_platform_run_wake(pci_dev, true);
>  
>  	return 0;
> @@ -980,6 +983,9 @@ static int pci_pm_runtime_resume(struct device *dev)
>  	if (!pm || !pm->runtime_resume)
>  		return -ENOSYS;
>  
> +	if (pci_pme_capable(pci_dev, pci_target_state(pci_dev)))
> +		pci_pme_active(pci_dev, false);
> +

Same here, pci_pm_default_resume_early() should cleare the PME theoretically,
although not for bridges.

>  	pci_platform_run_wake(pci_dev, false);
>  	pci_pm_default_resume_early(pci_dev);
>  	pci_pm_default_resume(pci_dev);
> diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
> index 935036e..9541588 100644

Generally, some parts of it belong to the
"PCI PM: Run-time callbacks for PCI bus type" patch and the others belong
to "PCI / ACPI PM: Platform support for PCI PME wake-up" patch.  Should I fold
the changes into them?

Rafael
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