usb: dwc2: Add hibernation entering flow by system suspend

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

Acked-by: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>
Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@synopsys.com>
Link: https://lore.kernel.org/r/20210416124811.BBFDBA005C@mailhost.synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index 093b171..9284862 100644 (file)
--- 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,