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

Artur Petrosyan
2021-04-15T05:40:54Z

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.Petrosyan@synopsys.com>
---
drivers/usb/dwc2/hcd.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)

diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index cc9ad6cf02d9..3b03b2d73aaa 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -4631,12 +4631,29 @@ 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);
+ if (retval)
+ dev_err(hsotg->dev,
+ "exit hibernation failed.\n");
+ } 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