linux-kernel - [PATCH] usb: dwc2: gadget: On USB RESET reset device address to zero

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Message-ID: <c41b1cd1-b4f7-4fca-9020-52f8649961b3@US01WEHTC1.internal.synopsys.com>
Date:   Tue, 11 Jul 2017 14:25:13 +0400
From:   Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>
To:     John Youn <John.Youn@...opsys.com>,
        Felipe Balbi <balbi@...nel.org>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>
Subject: [PATCH] usb: dwc2: gadget: On USB RESET reset device address to zero

Reseted DEVADDR field in DCFG to zero on USB RESET.

Device address in DCFG register does not reset to zero,
which required to pass enumeration, after disconnect and
reconnect.

Signed-off-by: Minas Harutyunyan <hminas@...opsys.com>
---
 drivers/usb/dwc2/gadget.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index 98a4a79e7f6e..c5c0a26a4d66 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -3561,6 +3561,9 @@ static irqreturn_t dwc2_hsotg_irq(int irq, void *pw)
 		/* Report disconnection if it is not already done. */
 		dwc2_hsotg_disconnect(hsotg);
 
+		/* Reset device address to zero */
+		__bic32(hsotg->regs + DCFG, DCFG_DEVADDR_MASK);
+
 		if (usb_status & GOTGCTL_BSESVLD && connected)
 			dwc2_hsotg_core_init_disconnected(hsotg, true);
 	}
-- 
2.11.0