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

[Artur Petrosyan]

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

Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@xxxxxxxxxxxx>
---
 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