[PATCH 07/15] usb: dwc2: Clear GINTSTS_RESTOREDONE bit after restore is generated.

Artur Petrosyan
2021-04-15T05:40:30Z

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 <Arthur.Petrosyan@synopsys.com>
Acked-by: Minas Harutyunyan <Minas.Harutyunyan@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 eccd96fa164e..576c262dba55 100644
--- a/drivers/usb/dwc2/core.c
+++ b/drivers/usb/dwc2/core.c
@@ -299,6 +299,12 @@ 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);
}
}

--
2.25.1