linux-kernel - [PATCH 4.9 40/68] usb: dwc3: turn off VBUS when leaving host mode

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Message-Id: <20200203161911.590194611@linuxfoundation.org>
Date:   Mon,  3 Feb 2020 16:19:36 +0000
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Bin Liu <b-liu@...com>,
        Felipe Balbi <balbi@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 40/68] usb: dwc3: turn off VBUS when leaving host mode

From: Bin Liu <b-liu@...com>

[ Upstream commit 09ed259fac621634d51cd986aa8d65f035662658 ]

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@...r.kernel.org
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>
---
 drivers/usb/dwc3/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 30bc5996a2f23..a89072f3bd3fb 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -936,6 +936,9 @@ static void dwc3_core_exit_mode(struct dwc3 *dwc)
 		/* 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)
-- 
2.20.1