xhci: Fixes for suspend/resume of shared HCDs.

Make sure the HCD_FLAG_HW_ACCESSIBLE flag is mirrored by both roothubs,
since it refers to whether the shared hardware is accessible.  Make sure
each bus is marked as suspended by setting usb_hcd->state to
HC_STATE_SUSPENDED when the PCI host controller is resumed.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>

drivers/usb/host/xhci-pci.c

@@ -225,7 +225,8 @@ static int xhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
 	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
 	int	retval = 0;
 
-	if (hcd->state != HC_STATE_SUSPENDED)
+	if (hcd->state != HC_STATE_SUSPENDED ||
+			xhci->shared_hcd->state != HC_STATE_SUSPENDED)
 		return -EINVAL;
 
 	retval = xhci_suspend(xhci);

drivers/usb/host/xhci-ring.c

@@ -2256,10 +2256,12 @@ irqreturn_t xhci_irq(struct usb_hcd *hcd)
 irqreturn_t xhci_msi_irq(int irq, struct usb_hcd *hcd)
 {
 	irqreturn_t ret;
+	struct xhci_hcd *xhci;
 
+	xhci = hcd_to_xhci(hcd);
 	set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
-	if (hcd->shared_hcd)
-		set_bit(HCD_FLAG_SAW_IRQ, &hcd->shared_hcd->flags);
+	if (xhci->shared_hcd)
+		set_bit(HCD_FLAG_SAW_IRQ, &xhci->shared_hcd->flags);
 
 	ret = xhci_irq(hcd);
 

drivers/usb/host/xhci.c

@@ -681,6 +681,7 @@ int xhci_suspend(struct xhci_hcd *xhci)
 
 	spin_lock_irq(&xhci->lock);
 	clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+	clear_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags);
 	/* step 1: stop endpoint */
 	/* skipped assuming that port suspend has done */
 
@@ -811,10 +812,14 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
 
 		xhci_dbg(xhci, "Start the secondary HCD\n");
 		retval = xhci_run(secondary_hcd);
-		if (!retval)
+		if (!retval) {
 			set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+			set_bit(HCD_FLAG_HW_ACCESSIBLE,
+					&xhci->shared_hcd->flags);
+		}
 failed_restart:
 		hcd->state = HC_STATE_SUSPENDED;
+		xhci->shared_hcd->state = HC_STATE_SUSPENDED;
 		return retval;
 	}
 
@@ -835,6 +840,7 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
 	 */
 
 	set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+	set_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags);
 
 	spin_unlock_irq(&xhci->lock);
 	return 0;