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xhci: Recognize USB 3.0 devices as superspeed at powerup

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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 69e848c209 "Intel xhci: Support
EHCI/xHCI port switching."

Signed-off-by: Manoj Iyer <manoj.iyer@canonical.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Manoj Iyer 2012-08-22 11:53:18 -05:00 committed by Sarah Sharp
parent fea7a08acb
commit 29d214576f
1 changed files with 2 additions and 1 deletions
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3
drivers/usb/host/pci-quirks.c
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@ -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