If not hibernation nor partial power down are supported,
port resume is done using the clock gating programming flow.
Adds a new flow of exiting clock gating when PC is
resumed.
Signed-off-by: Artur Petrosyan
---
Changes in v2:
- None
drivers/usb/dwc2/hcd.c | 22 ++
1 file changed, 22 insertions(+)
diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index 09dcd37b9ef8..04a1b53d65af 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -4445,6 +4445,28 @@ static int _dwc2_hcd_resume(struct usb_hcd *hcd)
break;
case DWC2_POWER_DOWN_PARAM_HIBERNATION:
case DWC2_POWER_DOWN_PARAM_NONE:
+ /*
+* If not hibernation nor partial power down are supported,
+* port resume is done using the clock gating programming flow.
+*/
+ spin_unlock_irqrestore(&hsotg->lock, flags);
+ dwc2_host_exit_clock_gating(hsotg, 0);
+
+ /*
+* Initialize the Core for Host mode, as after system resume
+* the global interrupts are disabled.
+*/
+ dwc2_core_init(hsotg, false);
+ dwc2_enable_global_interrupts(hsotg);
+ dwc2_hcd_reinit(hsotg);
+ spin_lock_irqsave(&hsotg->lock, flags);
+
+ /*
+* Set HW accessible bit before powering on the controller
+* since an interrupt may rise.
+*/
+ set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+ break;
default:
hsotg->lx_state = DWC2_L0;
goto unlock;
--
2.25.1
