usb: dwc2: Allow exit hibernation in urb enqueue

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.

Acked-by: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>
Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@synopsys.com>
Link: https://lore.kernel.org/r/20210416124803.D1C1FA005F@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 cc9ad6c..093b171 100644 (file)
--- 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)