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

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Message-Id: <65daa916b29e0009083702cb4584c8274e58ddac.1618464534.git.Arthur.Petrosyan@synopsys.com>
Date:   Thu, 15 Apr 2021 09:40:40 +0400
From:   Artur Petrosyan <Arthur.Petrosyan@...opsys.com>
To:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     John Youn <John.Youn@...opsys.com>,
        Artur Petrosyan <Arthur.Petrosyan@...opsys.com>
Subject: [PATCH 10/15] 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.

Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@...opsys.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