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

From: Ben Hutchings
Date: Wed May 20 2020 - 10:27:28 EST


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

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

From: Bin Liu <b-liu@xxxxxx>

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@xxxxxx>
Signed-off-by: Felipe Balbi <balbi@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
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)