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>

1 files changed, 10 insertions, 1 deletions

diff --git a/drivers/usb/dwc2/core.c b/drivers/usb/dwc2/core.c
index fa9b26b91507..4c0fa0b17353 100644
--- 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);