[PATCH v1 13/14] usb: dwc2: Clear GINTSTS_RESTOREDONE bit after restore is generated.

[Artur Petrosyan]

When hibernation exit is performed the dwc2_hib_restore_common()
function is called. In that function we wait until GINTSTS_RESTOREDONE
bit is set. However, after the setting of that bit we get a lot of
(dwc2_hsotg_irq:) interrupts which indicates that (GINTSTS.RstrDoneInt)
restore done interrupt is asserted.

To avoid restore done interrupt storm after restore is generated
clear GINTSTS_RESTOREDONE bit in GINTSTS register.

Signed-off-by: Artur Petrosyan <art...@synopsys.com>
---
 drivers/usb/dwc2/core.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/usb/dwc2/core.c b/drivers/usb/dwc2/core.c
index fbbd6a2f10ad..18ea0d896e12 100644
--- a/drivers/usb/dwc2/core.c
+++ b/drivers/usb/dwc2/core.c
@@ -382,6 +382,12 @@ void dwc2_hib_restore_common(struct dwc2_hsotg *hsotg, int 
rem_wakeup,
                        __func__);
        } else {
                dev_dbg(hsotg->dev, "restore done  generated here\n");
+
+               /*
+                * To avoid restore done interrupt storm after restore is
+                * generated clear GINTSTS_RESTOREDONE bit.
+                */
+               dwc2_writel(hsotg, GINTSTS_RESTOREDONE, GINTSTS);
        }
 }
 
-- 
2.11.0