linux-kernel - [ 034/167] [PATCH] usb: gadget: udc-core: stop UDC on device-initiated disconnect

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Date:	Wed, 09 May 2012 06:51:03 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Felipe Balbi <balbi@...com>
Subject: [ 034/167] [PATCH] usb: gadget: udc-core: stop UDC on device-initiated
 disconnect

3.2-stable review patch.  If anyone has any objections, please let me know.

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

From: Felipe Balbi <balbi@...com>

commit 6d258a4c42089229b855fd706622029decf316d6 upstream.

When we want to do device-initiated disconnect,
let's make sure we stop the UDC in order to
e.g. allow lower power states to be achieved by
turning off unnecessary clocks and/or stoping
PHYs.

When reconnecting, call ->udc_start() again to
make sure UDC is reinitialized.

Signed-off-by: Felipe Balbi <balbi@...com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/gadget/udc-core.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/gadget/udc-core.c b/drivers/usb/gadget/udc-core.c
index 56da49f..c261887 100644
--- a/drivers/usb/gadget/udc-core.c
+++ b/drivers/usb/gadget/udc-core.c
@@ -411,8 +411,12 @@ static ssize_t usb_udc_softconn_store(struct device *dev,
 	struct usb_udc		*udc = container_of(dev, struct usb_udc, dev);
 
 	if (sysfs_streq(buf, "connect")) {
+		if (udc_is_newstyle(udc))
+			usb_gadget_udc_start(udc->gadget, udc->driver);
 		usb_gadget_connect(udc->gadget);
 	} else if (sysfs_streq(buf, "disconnect")) {
+		if (udc_is_newstyle(udc))
+			usb_gadget_udc_stop(udc->gadget, udc->driver);
 		usb_gadget_disconnect(udc->gadget);
 	} else {
 		dev_err(dev, "unsupported command '%s'\n", buf);
-- 
1.7.10



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