NVIDIA 3.1 xHCI card would lose power when moving power state into D3Cold.
Thus we need to wait CNR bit to clear when xhci resmue as xhci init.
Signed-off-by: Rick Tseng <rtseng@xxxxxxxxxx>
---
drivers/usb/host/xhci.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 03d1e55..aee1fc5 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1108,6 +1108,17 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
hibernated = true;
if (!hibernated) {
+ /* Some xHC would lose power during suspend, so wait for
+ * controller ready from resume as xHC init.
+ */
+ retval = xhci_handshake(&xhci->op_regs->status,
+ STS_CNR, 0, 10 * 1000 * 1000);
+ if (retval) {
+ xhci_warn(xhci, "Controller not ready at resume %d\n",
+ retval);
+ spin_unlock_irq(&xhci->lock);
+ return retval;
+ }
/* step 1: restore register */
xhci_restore_registers(xhci);
/* step 2: initialize command ring buffer */
--
2.1.4
