[PATCH v2 13/32] usb: dwc2: host: clear pending interrupts prior hibernation

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From: Gregory Herrero <gregory.herrero@xxxxxxxxx>

If an interrupt rises during hibernation process, dwc2 will assert
interrupt line to interrupt controller. If interrupt is level
sensitive, interrupt handler will be called in a loop because dwc2
will not be able to clear it while controller is hibernated.
Thus, clear all controller interrupts before hibernation entry.

Signed-off-by: Gregory Herrero <gregory.herrero@xxxxxxxxx>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@xxxxxxxxx>
Tested-by: Robert Baldyga <r.baldyga@xxxxxxxxxxx>
---
 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 c5e0a45..bf5e951 100644
--- a/drivers/usb/dwc2/core.c
+++ b/drivers/usb/dwc2/core.c
@@ -398,6 +398,12 @@ int dwc2_enter_hibernation(struct dwc2_hsotg *hsotg)
 		}
 	}
 
+	/*
+	 * Clear any pending interrupts since dwc2 will not be able to
+	 * clear them after entering hibernation.
+	 */
+	dwc2_writel(0xffffffff, hsotg->regs + GINTSTS);
+
 	/* Put the controller in low power state */
 	pcgcctl = dwc2_readl(hsotg->regs + PCGCTL);
 
-- 
2.3.3

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