[PATCH v2 10/15] usb: dwc2: Allow exit hibernation in urb enqueue

[Artur Petrosyan]

When core is in hibernation state and an external
hub is connected, upper layer sends URB enqueue request,
which results in port reset issue.

- Added exit from hibernation state to avoid port
reset issue and process upper layer request properly.

Signed-off-by: Artur Petrosyan <arthur.petros...@synopsys.com>
---
 Changes in v2:
 - Moved duplicated error checking *if* conditions from innermost to outside if.

 drivers/usb/dwc2/hcd.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index cc9ad6cf02d9..093b1717df01 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -4631,12 +4631,26 @@ static int _dwc2_hcd_urb_enqueue(struct usb_hcd *hcd, 
struct urb *urb,
        struct dwc2_qh *qh;
        bool qh_allocated = false;
        struct dwc2_qtd *qtd;
+       struct dwc2_gregs_backup *gr;
+
+       gr = &hsotg->gr_backup;
 
        if (dbg_urb(urb)) {
                dev_vdbg(hsotg->dev, "DWC OTG HCD URB Enqueue\n");
                dwc2_dump_urb_info(hcd, urb, "urb_enqueue");
        }
 
+       if (hsotg->hibernated) {
+               if (gr->gotgctl & GOTGCTL_CURMODE_HOST)
+                       retval = dwc2_exit_hibernation(hsotg, 0, 0, 1);
+               else
+                       retval = dwc2_exit_hibernation(hsotg, 0, 0, 0);
+
+               if (retval)
+                       dev_err(hsotg->dev,
+                               "exit hibernation failed.\n");
+       }
+
        if (hsotg->in_ppd) {
                retval = dwc2_exit_partial_power_down(hsotg, 0, true);
                if (retval)
-- 
2.25.1