linux-kernel - Re: [PATCH 1/1] xhci: Unconditionally switch ports to xHCI on powerup

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Date:	Tue, 21 Aug 2012 20:12:55 +0800
From:	Andiry Xu <andiry@...il.com>
To:	manoj.iyer@...onical.com
Cc:	linux-kernel@...r.kernel.org, sarah.a.sharp@...ux.intel.com,
	gregkh@...uxfoundation.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH 1/1] xhci: Unconditionally switch ports to xHCI on powerup

On Tue, Aug 21, 2012 at 12:06 PM,  <manoj.iyer@...onical.com> wrote:
> From: Manoj Iyer <manoj.iyer@...onical.com>
>
> USB 3.0 devices show up as high-speed devices on powerup, after an
> s3 cycle they are correctly recognized as SuperSpeed. At powerup
> unconditionally switch the port to xHCI like we do when we resume
> from suspend.
>
> BugLink: http://bugs.launchpad.net/bugs/1000424
>
> Signed-off-by: Manoj Iyer <manoj.iyer@...onical.com>
> ---
>  drivers/usb/host/xhci-pci.c |    8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
> index 9bfd4ca11..5c8dbea 100644
> --- a/drivers/usb/host/xhci-pci.c
> +++ b/drivers/usb/host/xhci-pci.c
> @@ -48,6 +48,14 @@ static int xhci_pci_reinit(struct xhci_hcd *xhci, struct pci_dev *pdev)
>         if (!pci_set_mwi(pdev))
>                 xhci_dbg(xhci, "MWI active\n");
>
> +       /*
> +        * USB SuperSpeed ports are recognized as HighSpeed ports on powerup
> +        * unconditionally switch the ports to xHCI like we do when resume
> +        * from suspend.
> +        */
> +       if (usb_is_intel_switchable_xhci(pdev))
> +               usb_enable_xhci_ports(pdev);
> +

Strange. This should have been called during system power up, in
quirk_usb_handoff_xhci() of pci_quirks.c. Do you see that routine get
called during power up?

Thanks,
Andiry

>         xhci_dbg(xhci, "Finished xhci_pci_reinit\n");
>         return 0;
>  }
> --
> 1.7.9.5
>
> --
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