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xhci: Fix re-init on power loss after resume. 

When a host controller has lost power during a suspend, we must
reinitialize it.  Now that the xHCI host has two roothubs, xhci_run() and
xhci_stop() expect to be called with both usb_hcd structures.  Be sure
that the re-initialization code in xhci_resume() mirrors the process the
USB PCI probe function uses.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
This commit is contained in:
Sarah Sharp 2010-12-17 12:35:05 -08:00
parent f9de815187
commit 65b22f93fd
1 changed files with 19 additions and 4 deletions
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23
drivers/usb/host/xhci.c
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@ -730,6 +730,7 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
{
u32 command, temp = 0;
struct usb_hcd *hcd = xhci_to_hcd(xhci);
struct usb_hcd *secondary_hcd;
int retval;
/* Wait a bit if either of the roothubs need to settle from the
@ -790,15 +791,29 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
xhci_dbg(xhci, "xhci_stop completed - status = %x\n",
xhci_readl(xhci, &xhci->op_regs->status));
xhci_dbg(xhci, "Initialize the HCD\n");
retval = xhci_init(hcd);
/* USB core calls the PCI reinit and start functions twice:
* first with the primary HCD, and then with the secondary HCD.
* If we don't do the same, the host will never be started.
*/
if (!usb_hcd_is_primary_hcd(hcd))
secondary_hcd = hcd;
else
secondary_hcd = xhci->shared_hcd;
xhci_dbg(xhci, "Initialize the xhci_hcd\n");
retval = xhci_init(hcd->primary_hcd);
if (retval)
return retval;
xhci_dbg(xhci, "Start the primary HCD\n");
retval = xhci_run(hcd->primary_hcd);
if (retval)
goto failed_restart;
xhci_dbg(xhci, "Start the HCD\n");
retval = xhci_run(hcd);
xhci_dbg(xhci, "Start the secondary HCD\n");
retval = xhci_run(secondary_hcd);
if (!retval)
set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
failed_restart:
hcd->state = HC_STATE_SUSPENDED;
return retval;
}