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USB: work around for EHCI with quirky periodic schedules

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a quirky chipset needs periodic schedules to run for a minimum
time before they can be disabled again. This enforces the requirement
with a time stamp and a calculated delay

Signed-off-by: Oliver Neukum <oliver@neukum.org>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Oliver Neukum
2009-11-27 15:17:59 +01:00
committed by Greg Kroah-Hartman
parent 8d6499e5bd
commit ee4ecb8ac6
4 changed files with 20 additions and 0 deletions
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4
drivers/usb/host/ehci-pci.c
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@@ -111,6 +111,10 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
switch (pdev->vendor) {
case PCI_VENDOR_ID_INTEL:
ehci->need_io_watchdog = 0;
if (pdev->device == 0x27cc) {
ehci->broken_periodic = 1;
ehci_info(ehci, "using broken periodic workaround\n");
}
break;
case PCI_VENDOR_ID_TDI:
if (pdev->device == PCI_DEVICE_ID_TDI_EHCI) {