Commit 6768458b authored by JiSheng Zhang's avatar JiSheng Zhang Committed by Sarah Sharp
Browse files

USB: xhci: fix OS want to own HC 



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: default avatarJiSheng Zhang <jszhang3@gmail.com>
Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: stable@kernel.org
parent 7bd89b40

drivers/usb/host/pci-quirks.c

+1 −1
Original line number Diff line number Diff line
@@ -817,7 +817,7 @@ 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,

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