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

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Message-ID: <dafb5f50-dc45-42a6-b410-dc858899972e@US01WEHTC1.internal.synopsys.com>
Date:   Mon, 10 Jul 2017 17:38:11 +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 disconnect reset device address to zero

USB CV driver stack doesn't perform USB RESET after device disconnect/
connect, so need to reset to zero DEVADDR field in DCFG to pass
enumeration again.

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..deb3d901b99d 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -3174,6 +3174,9 @@ void dwc2_hsotg_disconnect(struct dwc2_hsotg *hsotg)
 		return;
 
 	hsotg->connected = 0;
+	/* On disconnect reset device address to zero */
+	__bic32(hsotg->regs + DCFG, DCFG_DEVADDR_MASK);
+
 	hsotg->test_mode = 0;
 
 	for (ep = 0; ep < hsotg->num_of_eps; ep++) {
-- 
2.11.0