usb: dwc2: gadget: Fix exiting from clock gating

Added exiting from the clock gating mode on USB Reset Detect interrupt
if core in the clock gating mode.
Added new condition to check core in clock gating mode or no.

Fixes: 9b4965d ("usb: dwc2: Add exit clock gating from session request interrupt")
Fixes: 5d240ef ("usb: dwc2: Add exit clock gating from wakeup interrupt")
Fixes: 16c729f ("usb: dwc2: Allow exit clock gating in urb enqueue")
Fixes: 401411b ("usb: dwc2: Add exit clock gating before removing driver")
CC: stable@vger.kernel.org
Signed-off-by: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>
Link: https://lore.kernel.org/r/cbcc2ccd37e89e339130797ed68ae4597db773ac.1708938774.git.Minas.Harutyunyan@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: Minas Harutyunyan

drivers/usb/dwc2/core_intr.c

@@ -297,7 +297,8 @@ static void dwc2_handle_session_req_intr(struct dwc2_hsotg *hsotg)
 
 			/* Exit gadget mode clock gating. */
 			if (hsotg->params.power_down ==
-			    DWC2_POWER_DOWN_PARAM_NONE && hsotg->bus_suspended)
+			    DWC2_POWER_DOWN_PARAM_NONE && hsotg->bus_suspended &&
+			    !hsotg->params.no_clock_gating)
 				dwc2_gadget_exit_clock_gating(hsotg, 0);
 		}
 
@@ -408,7 +409,8 @@ static void dwc2_handle_wakeup_detected_intr(struct dwc2_hsotg *hsotg)
 
 			/* Exit gadget mode clock gating. */
 			if (hsotg->params.power_down ==
-			    DWC2_POWER_DOWN_PARAM_NONE && hsotg->bus_suspended)
+			    DWC2_POWER_DOWN_PARAM_NONE && hsotg->bus_suspended &&
+			    !hsotg->params.no_clock_gating)
 				dwc2_gadget_exit_clock_gating(hsotg, 0);
 		} else {
 			/* Change to L0 state */
@@ -425,7 +427,8 @@ static void dwc2_handle_wakeup_detected_intr(struct dwc2_hsotg *hsotg)
 			}
 
 			if (hsotg->params.power_down ==
-			    DWC2_POWER_DOWN_PARAM_NONE && hsotg->bus_suspended)
+			    DWC2_POWER_DOWN_PARAM_NONE && hsotg->bus_suspended &&
+			    !hsotg->params.no_clock_gating)
 				dwc2_host_exit_clock_gating(hsotg, 1);
 
 			/*

drivers/usb/dwc2/gadget.c

@@ -3727,6 +3727,12 @@ static irqreturn_t dwc2_hsotg_irq(int irq, void *pw)
 		if (hsotg->in_ppd && hsotg->lx_state == DWC2_L2)
 			dwc2_exit_partial_power_down(hsotg, 0, true);
 
+		/* Exit gadget mode clock gating. */
+		if (hsotg->params.power_down ==
+		    DWC2_POWER_DOWN_PARAM_NONE && hsotg->bus_suspended &&
+		    !hsotg->params.no_clock_gating)
+			dwc2_gadget_exit_clock_gating(hsotg, 0);
+
 		hsotg->lx_state = DWC2_L0;
 	}
 

drivers/usb/dwc2/hcd.c

@@ -4657,7 +4657,7 @@ static int _dwc2_hcd_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
 	}
 
 	if (hsotg->params.power_down == DWC2_POWER_DOWN_PARAM_NONE &&
-	    hsotg->bus_suspended) {
+	    hsotg->bus_suspended && !hsotg->params.no_clock_gating) {
 		if (dwc2_is_device_mode(hsotg))
 			dwc2_gadget_exit_clock_gating(hsotg, 0);
 		else

drivers/usb/dwc2/platform.c

@@ -331,7 +331,7 @@ static void dwc2_driver_remove(struct platform_device *dev)
 
 	/* Exit clock gating when driver is removed. */
 	if (hsotg->params.power_down == DWC2_POWER_DOWN_PARAM_NONE &&
-	    hsotg->bus_suspended) {
+	    hsotg->bus_suspended && !hsotg->params.no_clock_gating) {
 		if (dwc2_is_device_mode(hsotg))
 			dwc2_gadget_exit_clock_gating(hsotg, 0);
 		else