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xhci: Restore event ring dequeue pointer on resume.

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commit fb3d85bc71 upstream.

The xhci_save_registers() function saved the event ring dequeue pointer
in the s3 register structure, but xhci_restore_registers() never
restored it.  No other code in the xHCI successful resume path would
ever restore it either.  Fix that.

This should be backported to kernels as old as 2.6.37, that contain the
commit 5535b1d5f8 "USB: xHCI: PCI power
management implementation".

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Tested-by: Elric Fu <elricfu1@gmail.com>
Cc: Andiry Xu <andiry.xu@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sarah Sharp 2012-03-16 13:27:39 -07:00 • committed by Greg Kroah-Hartman
commit 12faabb18d
1 changed files with 1 additions and 0 deletions
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drivers/usb/host/xhci.c
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@ -627,6 +627,7 @@ static void xhci_restore_registers(struct xhci_hcd *xhci)
xhci_writel(xhci, xhci->s3.irq_control, &xhci->ir_set->irq_control);
xhci_writel(xhci, xhci->s3.erst_size, &xhci->ir_set->erst_size);
xhci_write_64(xhci, xhci->s3.erst_base, &xhci->ir_set->erst_base);
xhci_write_64(xhci, xhci->s3.erst_dequeue, &xhci->ir_set->erst_dequeue);
}
static void xhci_set_cmd_ring_deq(struct xhci_hcd *xhci)