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Commit 29d21457 authored by Manoj Iyer's avatar Manoj Iyer Committed by Sarah Sharp
Browse files

xhci: Recognize USB 3.0 devices as superspeed at powerup 

On Intel Panther Point chipset USB 3.0 devices show up as
high-speed devices on powerup, but after an s3 cycle they are
correctly recognized as SuperSpeed. At powerup switch the port
to xHCI so that USB 3.0 devices are correctly recognized.

BugLink: http://bugs.launchpad.net/bugs/1000424



This patch should be backported to kernels as old as 3.0, that contain
commit ID 69e848c2 "Intel xhci: Support
EHCI/xHCI port switching."

Signed-off-by: default avatarManoj Iyer <manoj.iyer@canonical.com>
Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: stable@vger.kernel.org
parent fea7a08a

drivers/usb/host/pci-quirks.c

+2 −1
Original line number Diff line number Diff line
@@ -870,9 +870,10 @@ static void __devinit quirk_usb_handoff_xhci(struct pci_dev *pdev) 
	/* Disable any BIOS SMIs and clear all SMI events*/

	writel(val, base + ext_cap_offset + XHCI_LEGACY_CONTROL_OFFSET);



hc_init:

	if (usb_is_intel_switchable_xhci(pdev))

		usb_enable_xhci_ports(pdev);

hc_init:



	op_reg_base = base + XHCI_HC_LENGTH(readl(base));



	/* Wait for the host controller to be ready before writing any