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usb: gadget: mv_udc: fix hang when shutdown

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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>
This commit is contained in:
Yunfan Zhang 2012-07-10 10:07:06 +08:00 committed by Felipe Balbi
parent 60326ce377
commit 1dcaa252fd
1 changed files with 2 additions and 0 deletions
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2
drivers/usb/gadget/mv_udc_core.c
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@ -2501,9 +2501,11 @@ static void mv_udc_shutdown(struct platform_device *dev)
u32 mode; u32 mode;
/* reset controller mode to IDLE */ /* reset controller mode to IDLE */
mv_udc_enable(udc);
mode = readl(&udc->op_regs->usbmode); mode = readl(&udc->op_regs->usbmode);
mode &= ~3; mode &= ~3;
writel(mode, &udc->op_regs->usbmode); writel(mode, &udc->op_regs->usbmode);
mv_udc_disable(udc);
} }
static struct platform_driver udc_driver = { static struct platform_driver udc_driver = {