usb: dwc2: Allow exit clock gating in urb enqueue

When core is in clock gating state and an external
hub is connected, upper layer sends URB enqueue request,
which results in port reset issue.

Added exit from clock gating state to avoid port
reset issue and process upper layer request properly.

Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@synopsys.com>
Link: https://lore.kernel.org/r/20210413073708.ADFC6A0094@mailhost.synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index 8a42675ab94edc34f34720482e7bb2428a702bf9..31d6a1b87228df58eb91e25370ada9b55383a98e 100644 (file)
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -4597,6 +4597,14 @@ static int _dwc2_hcd_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
                                "exit partial_power_down failed\n");
        }
 
+       if (hsotg->params.power_down == DWC2_POWER_DOWN_PARAM_NONE &&
+           hsotg->bus_suspended) {
+               if (dwc2_is_device_mode(hsotg))
+                       dwc2_gadget_exit_clock_gating(hsotg, 0);
+               else
+                       dwc2_host_exit_clock_gating(hsotg, 0);
+       }
+
        if (!ep)
                return -EINVAL;