linux-kernel - Re: [PATCH] USB: xhci: fix OS want to own HC

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Date:	Mon, 18 Jul 2011 09:44:10 -0700
From:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
To:	JiSheng Zhang <jszhang3@...il.com>
Cc:	linux-kernel@...r.kernel.org, Greg KH <greg@...ah.com>
Subject: Re: [PATCH] USB: xhci: fix OS want to own HC

On Sat, Jul 16, 2011 at 11:04:19AM +0800, JiSheng Zhang wrote:
> Software should set XHCI_HC_OS_OWNED bit to request ownership of xHC

Good catch!  I'll queue this up to my for-usb-linus branch and send it
out to Greg later today.

Greg, do you think it's too late to get this into 3.0?  Shall I just
add it to usb-next and mark it for stable?

Sarah Sharp

> Signed-off-by: JiSheng Zhang <jszhang3@...il.com>
> ---
>  drivers/usb/host/pci-quirks.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
> index fd93061..1a73004 100644
> --- a/drivers/usb/host/pci-quirks.c
> +++ b/drivers/usb/host/pci-quirks.c
> @@ -775,7 +775,7 @@ static void __devinit quirk_usb_handoff_xhci(struct pci_dev *pdev)
>  
>  	/* If the BIOS owns the HC, signal that the OS wants it, and wait */
>  	if (val & XHCI_HC_BIOS_OWNED) {
> -		writel(val & XHCI_HC_OS_OWNED, base + ext_cap_offset);
> +		writel(val | XHCI_HC_OS_OWNED, base + ext_cap_offset);
>  
>  		/* Wait for 5 seconds with 10 microsecond polling interval */
>  		timeout = handshake(base + ext_cap_offset, XHCI_HC_BIOS_OWNED,
> -- 
> 1.7.5.4
> 
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