[PATCH] usb: host: xhci-rcar: Fix timeout in xhci_suspend()

[Yoshihiro Shimoda]

When a USB device is connected to the host controller and
the system enters suspend, the following error happens
in xhci_suspend():

        xhci-hcd ee000000.usb: WARN: xHC CMD_RUN timeout

Since the firmware/internal CPU control the USBSTS.STS_HALT
and the process speed is down when the roothub port enters U3,
long delay for the handshake of STS_HALT is neeed in xhci_suspend().
So, this patch adds to set the XHCI_SLOW_SUSPEND.

Fixes: 435cc1138ec9 ("usb: host: xhci-plat: set resume_quirk() for R-Car 
controllers")
Cc: <sta...@vger.kernel.org> # v4.12+
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda...@renesas.com>
---
 drivers/usb/host/xhci-rcar.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/host/xhci-rcar.c b/drivers/usb/host/xhci-rcar.c
index 671bce1..8616c52 100644
--- a/drivers/usb/host/xhci-rcar.c
+++ b/drivers/usb/host/xhci-rcar.c
@@ -238,10 +238,15 @@ int xhci_rcar_init_quirk(struct usb_hcd *hcd)
         * pointers. So, this driver clears the AC64 bit of xhci->hcc_params
         * to call dma_set_coherent_mask(dev, DMA_BIT_MASK(32)) in
         * xhci_gen_setup().
+        *
+        * And, since the firmware/internal CPU control the USBSTS.STS_HALT
+        * and the process speed is down when the roothub port enters U3,
+        * long delay for the handshake of STS_HALT is neeed in xhci_suspend().
         */
        if (xhci_rcar_is_gen2(hcd->self.controller) ||
-                       xhci_rcar_is_gen3(hcd->self.controller))
-               xhci->quirks |= XHCI_NO_64BIT_SUPPORT;
+                       xhci_rcar_is_gen3(hcd->self.controller)) {
+               xhci->quirks |= XHCI_NO_64BIT_SUPPORT | XHCI_SLOW_SUSPEND;
+       }
 
        if (!xhci_rcar_wait_for_pll_active(hcd))
                return -ETIMEDOUT;
-- 
2.7.4