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usb: dwc2: host: clear pending interrupts prior hibernation 

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@intel.com>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@intel.com>
Tested-by: Robert Baldyga <r.baldyga@samsung.com>
Tested-by: Dinh Nguyen <dinguyen@opensource.altera.com>
Tested-by: John Youn <johnyoun@synopsys.com>
Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
hifive-unleashed-5.1
Gregory Herrero 2015-09-22 15:16:49 +02:00 committed by Felipe Balbi
parent 5bbf6ce0a9
commit cad73da26c
1 changed files with 6 additions and 0 deletions
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6
drivers/usb/dwc2/core.c
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@ -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);