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>

1 files changed, 7 insertions, 3 deletions

diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index 57c7400057fa..d6222e946463 100644
--- 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)