linux-kernel - [PATCH v3 10/14] usb: dwc2: Allow exit partial power down in urb enqueue

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Date:   Thu, 08 Apr 2021 13:45:41 +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 v3 10/14] usb: dwc2: Allow exit partial power down in urb enqueue

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

Added exit from partial power down state to avoid port
reset issue and process upper layer request correctly.

Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@...opsys.com>
---
 Changes in v3:
 - None
 Changes in v2:
 - None

 drivers/usb/dwc2/hcd.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index 9529e9839961..cb52bc41bfb8 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -4633,6 +4633,13 @@ static int _dwc2_hcd_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
 		dwc2_dump_urb_info(hcd, urb, "urb_enqueue");
 	}
 
+	if (hsotg->in_ppd) {
+		retval = dwc2_exit_partial_power_down(hsotg, 0, true);
+		if (retval)
+			dev_err(hsotg->dev,
+				"exit partial_power_down failed\n");
+	}
+
 	if (!ep)
 		return -EINVAL;
 
-- 
2.25.1