usb: dwc2: do not gate off the hardware if it does not support clock gating

We should not be clearing the HCD_FLAG_HW_ACCESSIBLE bit if the hardware
does not support clock gating.

Fixes: 50fb0c1 ("usb: dwc2: Add clock gating entering flow by system suspend")
Acked-by: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
Link: https://lore.kernel.org/r/20220104135922.734776-1-dinguyen@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: Dinh Nguyen

drivers/usb/dwc2/hcd.c

@@ -4399,11 +4399,12 @@ static int _dwc2_hcd_suspend(struct usb_hcd *hcd)
 		 * If not hibernation nor partial power down are supported,
 		 * clock gating is used to save power.
 		 */
-		if (!hsotg->params.no_clock_gating)
+		if (!hsotg->params.no_clock_gating) {
 			dwc2_host_enter_clock_gating(hsotg);
 
-		/* After entering suspend, hardware is not accessible */
-		clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+			/* After entering suspend, hardware is not accessible */
+			clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+		}
 		break;
 	default:
 		goto skip_power_saving;