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usb: dwc2: Clear GINTSTS_RESTOREDONE bit after restore is generated. 

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.

Acked-by: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>
Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@synopsys.com>
Link: https://lore.kernel.org/r/20210416124739.D6269A005D@mailhost.synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Artur Petrosyan 2021-04-16 16:47:38 +04:00 committed by Greg Kroah-Hartman
parent 238f65aeea
commit 5160d6871a
1 changed files with 6 additions and 0 deletions
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6
drivers/usb/dwc2/core.c
View File

@ -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);
}
}