usb: dwc2: Add hibernation exiting flow by system resume

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

Acked-by: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>
Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@synopsys.com>
Link: https://lore.kernel.org/r/20210416124819.A3B26A005C@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 92848629cc61ee98b57b6690e3ead1df26ed7f46..035d4911a3c324d81d742dc91c775444fde42164 100644 (file)
--- 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,