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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Bin Liu <b-liu@ti.com>,
        Felipe Balbi <balbi@kernel.org>
Subject: [PATCH 4.19 07/55] usb: dwc3: turn off VBUS when leaving host mode
Date:   Thu, 30 Jan 2020 19:38:48 +0100
Message-Id: <20200130183610.083422589@linuxfoundation.org>
In-Reply-To: <20200130183608.563083888@linuxfoundation.org>
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From: Bin Liu <b-liu@ti.com>

commit 09ed259fac621634d51cd986aa8d65f035662658 upstream.

VBUS should be turned off when leaving the host mode.
Set GCTL_PRTCAP to device mode in teardown to de-assert DRVVBUS pin to
turn off VBUS power.

Fixes: 5f94adfeed97 ("usb: dwc3: core: refactor mode initialization to its own function")
Cc: stable@vger.kernel.org
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/dwc3/core.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1199,6 +1199,9 @@ static void dwc3_core_exit_mode(struct d
 		/* do nothing */
 		break;
 	}
+
+	/* de-assert DRVVBUS for HOST and OTG mode */
+	dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE);
 }
 
 static void dwc3_get_properties(struct dwc3 *dwc)