MLK-16735 usb: host: add XHCI_CDNS_HOST flag

The NXP Cadence XHCI host has the same issue with Intel's,
it is triggered by reboot test, the test case is described
at this jira ticket.

BuildInfo:
- SCFW 8dcff26, IMX-MKIMAGE ea027c4b, ATF
- U-Boot 2017.03-imx_v2017.03_4.9.51_imx8_beta1+g6dc7b0f

Acked-by: Jun Li <jun.li@nxp.com>
Signed-off-by: Peter Chen <peter.chen@nxp.com>

drivers/usb/cdns3/host.c

@@ -34,7 +34,7 @@ static void xhci_cdns3_quirks(struct device *dev, struct xhci_hcd *xhci)
 	 * here that the generic code does not try to make a pci_dev from our
 	 * dev struct in order to setup MSI
 	 */
-	xhci->quirks |= XHCI_PLAT;
+	xhci->quirks |= (XHCI_PLAT | XHCI_CDNS_HOST);
 }
 
 static int xhci_cdns3_setup(struct usb_hcd *hcd)

drivers/usb/host/xhci.c

@@ -205,7 +205,7 @@ int xhci_reset(struct xhci_hcd *xhci)
 	 * Without this delay, the subsequent HC register access,
 	 * may result in a system hang very rarely.
 	 */
-	if (xhci->quirks & XHCI_INTEL_HOST)
+	if (xhci->quirks & (XHCI_INTEL_HOST | XHCI_CDNS_HOST))
 		udelay(1000);
 
 	ret = xhci_handshake(&xhci->op_regs->command,

drivers/usb/host/xhci.h

@@ -1841,6 +1841,7 @@ struct xhci_hcd {
 #define XHCI_RESET_PLL_ON_DISCONNECT	BIT_ULL(34)
 #define XHCI_SNPS_BROKEN_SUSPEND    BIT_ULL(35)
 #define XHCI_SKIP_ACCESS_RESERVED_REG	(1 << 29)
+#define XHCI_CDNS_HOST		(1 << 31)
 
 	unsigned int		num_active_eps;
 	unsigned int		limit_active_eps;