[PATCH 12/15] usb: dwc2: Add hibernation exiting flow by system resume

Artur Petrosyan
2021-04-15T05:41:03Z

Adds a new flow of exiting hibernation when PC is resumed
from suspend state.

Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@synopsys.com>
---
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 db8eb1940d17..c92307775863 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -4470,6 +4470,16 @@ static int _dwc2_hcd_resume(struct usb_hcd *hcd)
set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
break;
case DWC2_POWER_DOWN_PARAM_HIBERNATION:
+ ret = dwc2_exit_hibernation(hsotg, 0, 0, 1);
+ if (ret)
+ dev_err(hsotg->dev, "exit hibernation failed.\n");
+
+ /*
+ * Set HW accessible bit before powering on the controller
+ * since an interrupt may rise.
+ */
+ set_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