usb: dwc2: Add msleep for host-only

Although a host-only controller should not have any associated delay,
some rockchip SOC platforms will not show the correct host-values of
registers until after a delay.

So add a 50 ms sleep when in host-only mode.

Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/dwc2/core.c b/drivers/usb/dwc2/core.c
index fa9b26b..4c0fa0b 100644 (file)
--- a/drivers/usb/dwc2/core.c
+++ b/drivers/usb/dwc2/core.c
@@ -463,9 +463,18 @@ static void dwc2_clear_force_mode(struct dwc2_hsotg *hsotg)
  */
 void dwc2_force_dr_mode(struct dwc2_hsotg *hsotg)
 {
+       bool ret;
+
        switch (hsotg->dr_mode) {
        case USB_DR_MODE_HOST:
-               dwc2_force_mode(hsotg, true);
+               ret = dwc2_force_mode(hsotg, true);
+               /*
+                * NOTE: This is required for some rockchip soc based
+                * platforms on their host-only dwc2.
+                */
+               if (!ret)
+                       msleep(50);
+
                break;
        case USB_DR_MODE_PERIPHERAL:
                dwc2_force_mode(hsotg, false);