[PATCH 4.15 007/128] xhci: Fix front USB ports on ASUS PRIME B350M-A

[Greg Kroah-Hartman]

4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>

commit 191edc5e2e515aab1075a3f0ef23599e80be5f59 upstream.

When a USB device gets plugged on ASUS PRIME B350M-A's front ports, the
xHC stops working:
[  549.114587] xhci_hcd 0000:02:00.0: WARN: xHC CMD_RUN timeout
[  549.114608] suspend_common(): xhci_pci_suspend+0x0/0xc0 returns -110
[  549.114638] xhci_hcd 0000:02:00.0: can't suspend (hcd_pci_runtime_suspend returned -110)

Delay before running xHC command CMD_RUN can workaround the issue.

Use a new quirk to make the delay only targets to the affected xHC.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/usb/host/xhci-pci.c |    3 +++
 drivers/usb/host/xhci.c     |    3 +++
 drivers/usb/host/xhci.h     |    1 +
 3 files changed, 7 insertions(+)

--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -122,6 +122,9 @@ static void xhci_pci_quirks(struct devic
 	if (pdev->vendor == PCI_VENDOR_ID_AMD && usb_amd_find_chipset_info())
 		xhci->quirks |= XHCI_AMD_PLL_FIX;
 
+	if (pdev->vendor == PCI_VENDOR_ID_AMD && pdev->device == 0x43bb)
+		xhci->quirks |= XHCI_SUSPEND_DELAY;
+
 	if (pdev->vendor == PCI_VENDOR_ID_AMD)
 		xhci->quirks |= XHCI_TRUST_TX_LENGTH;
 
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -880,6 +880,9 @@ int xhci_suspend(struct xhci_hcd *xhci,
 	clear_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags);
 	del_timer_sync(&xhci->shared_hcd->rh_timer);
 
+	if (xhci->quirks & XHCI_SUSPEND_DELAY)
+		usleep_range(1000, 1500);
+
 	spin_lock_irq(&xhci->lock);
 	clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 	clear_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags);
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1823,6 +1823,7 @@ struct xhci_hcd {
 /* Reserved. It was XHCI_U2_DISABLE_WAKE */
 #define XHCI_ASMEDIA_MODIFY_FLOWCONTROL	(1 << 28)
 #define XHCI_HW_LPM_DISABLE	(1 << 29)
+#define XHCI_SUSPEND_DELAY	(1 << 30)
 
 	unsigned int		num_active_eps;
 	unsigned int		limit_active_eps;