From: Yunfan Zhang <yfzhang@marvell.com>
Date: Tue, 10 Jul 2012 02:07:06 +0000 (+0800)
Subject: usb: gadget: mv_udc: fix hang when shutdown
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1dcaa252fdf01e4ba49ece156812043baf01c7cc;p=linux-beck.git

usb: gadget: mv_udc: fix hang when shutdown

Fix system hang in udc shutdown routine which caused by accessing usb
register when clock is disabled. So enable usb clock before access
register.

Signed-off-by: Yunfan Zhang <yfzhang@marvell.com>
Signed-off-by: Neil Zhang <zhangwm@marvell.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
---

diff --git a/drivers/usb/gadget/mv_udc_core.c b/drivers/usb/gadget/mv_udc_core.c
index ff6154d1816e..58edff9abcef 100644
--- a/drivers/usb/gadget/mv_udc_core.c
+++ b/drivers/usb/gadget/mv_udc_core.c
@@ -2501,9 +2501,11 @@ static void mv_udc_shutdown(struct platform_device *dev)
 	u32 mode;
 
 	/* reset controller mode to IDLE */
+	mv_udc_enable(udc);
 	mode = readl(&udc->op_regs->usbmode);
 	mode &= ~3;
 	writel(mode, &udc->op_regs->usbmode);
+	mv_udc_disable(udc);
 }
 
 static struct platform_driver udc_driver = {