[PATCH v2 11/15] usb: dwc2: Add hibernation entering flow by system suspend

Artur Petrosyan
2021-04-16T12:48:17Z

Adds a new flow of entering hibernation when PC is
hibernated or suspended.

Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@synopsys.com>
---
Changes in v2:
- None

drivers/usb/dwc2/hcd.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index 093b1717df01..92848629cc61 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -4387,6 +4387,16 @@ static int _dwc2_hcd_suspend(struct usb_hcd *hcd)
clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
break;
case DWC2_POWER_DOWN_PARAM_HIBERNATION:
+ /* Enter hibernation */
+ spin_unlock_irqrestore(&hsotg->lock, flags);
+ ret = dwc2_enter_hibernation(hsotg, 1);
+ if (ret)
+ dev_err(hsotg->dev, "enter hibernation failed\n");
+ spin_lock_irqsave(&hsotg->lock, flags);
+
+ /* After entering suspend, hardware is not accessible */
+ clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+ break;
case DWC2_POWER_DOWN_PARAM_NONE:
/*
* If not hibernation nor partial power down are supported,
--
2.25.1