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 ff6154d1816eacb1e82945f9712f6268e92e4374..58edff9abcef28a483722fea817fc1b1a3265b6b 100644 (file)
--- 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 = {