linux-kernel - [PATCH 3.16 48/99] usb: dwc3: turn off VBUS when leaving host mode

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Date:   Wed, 20 May 2020 15:14:16 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Sasha Levin" <sashal@...nel.org>,
        "Felipe Balbi" <balbi@...nel.org>, "Bin Liu" <b-liu@...com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Subject: [PATCH 3.16 48/99] usb: dwc3: turn off VBUS when leaving host mode

3.16.84-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Bin Liu <b-liu@...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")
Signed-off-by: Bin Liu <b-liu@...com>
Signed-off-by: Felipe Balbi <balbi@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/dwc3/core.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -614,6 +614,9 @@ static void dwc3_core_exit_mode(struct d
 		/* do nothing */
 		break;
 	}
+
+	/* de-assert DRVVBUS for HOST and OTG mode */
+	dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE);
 }
 
 #define DWC3_ALIGN_MASK		(16 - 1)