linux-kernel - [02/20] USB: xhci: fix OS want to own HC

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Message-Id: <20110826220419.048457933@clark.kroah.org>
Date:	Fri, 26 Aug 2011 15:03:25 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	JiSheng Zhang <jszhang3@...il.com>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Subject: [02/20] USB: xhci: fix OS want to own HC

2.6.33-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: JiSheng Zhang <jszhang3@...il.com>

commit 6768458b17f9bf48a4c3a34e49b20344091b5f7e upstream.

Software should set XHCI_HC_OS_OWNED bit to request ownership of xHC.

This patch should be backported to kernels as far back as 2.6.31.

Signed-off-by: JiSheng Zhang <jszhang3@...il.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/usb/host/pci-quirks.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -412,7 +412,7 @@ static void __devinit quirk_usb_handoff_
 
 	/* 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,


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