xhci: Fix resume issues on Renesas chips in Samsung laptops

Don Zickus <dzickus@redhat.com> writes:

Some co-workers of mine bought Samsung laptops that had mostly usb3 ports.
Those ports did not resume correctly (the driver would timeout communicating
and fail).  This led to frustration as suspend/resume is a common use for
laptops.

Poking around, I applied the reset on resume quirk to this chipset and the
resume started working.  Reloading the xhci_hcd module had been the temporary
workaround.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Reported-by: Don Zickus <dzickus@redhat.com>
Tested-by: Prarit Bhargava <prarit@redhat.com>
Cc: stable # 2.6.37

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 3c898c1..04f986d 100644 (file)
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -142,6 +142,11 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
                                "QUIRK: Resetting on resume");
                xhci->quirks |= XHCI_TRUST_TX_LENGTH;
        }
+       if (pdev->vendor == PCI_VENDOR_ID_RENESAS &&
+                       pdev->device == 0x0015 &&
+                       pdev->subsystem_vendor == PCI_VENDOR_ID_SAMSUNG &&
+                       pdev->subsystem_device == 0xc0cd)
+               xhci->quirks |= XHCI_RESET_ON_RESUME;
        if (pdev->vendor == PCI_VENDOR_ID_VIA)
                xhci->quirks |= XHCI_RESET_ON_RESUME;
 }