usb: dwc2: Add safety check for STSPHSERCVD intr

STSPHSERCVD (status phase received) interrupt should be
handled when EP0 is in DWC2_EP0_DATA_OUT state.

Sometimes STSPHSERCVD interrupt asserted , when EP0
is not in DATA_OUT state. Spurios interrupt.

Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Minas Harutyunyan <hminas@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index 57c7400..d6222e9 100644 (file)
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -2976,9 +2976,13 @@ static void dwc2_hsotg_epint(struct dwc2_hsotg *hsotg, unsigned int idx,
        if (ints & DXEPINT_STSPHSERCVD) {
                dev_dbg(hsotg->dev, "%s: StsPhseRcvd\n", __func__);
 
-               /* Move to STATUS IN for DDMA */
-               if (using_desc_dma(hsotg))
-                       dwc2_hsotg_ep0_zlp(hsotg, true);
+               /* Safety check EP0 state when STSPHSERCVD asserted */
+               if (hsotg->ep0_state == DWC2_EP0_DATA_OUT) {
+                       /* Move to STATUS IN for DDMA */
+                       if (using_desc_dma(hsotg))
+                               dwc2_hsotg_ep0_zlp(hsotg, true);
+               }
+
        }
 
        if (ints & DXEPINT_BACK2BACKSETUP)