linux-kernel - Re: [PATCH RESEND] PCI: Allow pcie_aspm=force to work even when FADT indicates it is unsupported

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Date:	Mon, 14 Jan 2013 16:33:04 -0700
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Colin King <colin.king@...onical.com>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] PCI: Allow pcie_aspm=force to work even when FADT
 indicates it is unsupported

On Tue, Nov 27, 2012 at 7:09 AM, Colin King <colin.king@...onical.com> wrote:
> From: Colin Ian King <colin.king@...onical.com>
>
> BugLink: http://bugs.launchpad.net/bugs/962038
>
> Right now using pcie_aspm=force will not enable ASPM if the FADT indicates
> ASPM is unsupported.  However, the semantics of force should probably allow
> for this, especially as they did before the ASPM disable rework with commit
> 3c076351c4027a56d5005a39a0b518a4ba393ce2
>
> This patch just skips the clearing of any ASPM setup that the firmware has
> carried out on this bus if pcie_aspm=force is being used.
>
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

I applied this to my for-linus branch, so it should appear in v3.8.
Thanks, and sorry for the delay in applying this.

Bjorn

> ---
>  drivers/pci/pcie/aspm.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
> index 213753b..449f257 100644
> --- a/drivers/pci/pcie/aspm.c
> +++ b/drivers/pci/pcie/aspm.c
> @@ -773,6 +773,9 @@ void pcie_clear_aspm(struct pci_bus *bus)
>  {
>         struct pci_dev *child;
>
> +       if (aspm_force)
> +               return;
> +
>         /*
>          * Clear any ASPM setup that the firmware has carried out on this bus
>          */
> --
> 1.8.0
>
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