diff mbox series

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

Message ID 73d2c9aca58e7cac50d02bbbd853c23ab0463b48.1555672441.git.arturp@synopsys.com (mailing list archive)
State New, archived
Headers show
Series usb: dwc2: Fix and improve power saving modes. | expand

Commit Message

Artur Petrosyan April 19, 2019, 11:25 a.m. UTC 
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 <arturp@synopsys.com>
---
 drivers/usb/dwc2/core.c | 6 ++++++
 1 file changed, 6 insertions(+)
diff mbox series

Patch

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);
 	}
 }