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usb: gadget: mv_udc: fix kernel panic on some platforms 

Some platforms will use usb to download images, the controller may not
be stopped correctly when start kernel. In some cases, it may have some
pending interrupts, and they will be triggered immediately when we finish
requesting irq in function probe. But we haven't finished the device
initialization at this time. So let's stop udc here to avoid this case
occurred.

Signed-off-by: Neil Zhang <zhangwm@marvell.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Neil Zhang 2011-10-12 16:49:26 +08:00 committed by Felipe Balbi
parent 5d0b8d0f3a
commit 4540a9ab31
1 changed files with 7 additions and 0 deletions
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7
drivers/usb/gadget/mv_udc_core.c
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@ -2037,6 +2037,13 @@ static int __devinit mv_udc_probe(struct platform_device *dev)
& CAPLENGTH_MASK));
udc->max_eps = readl(&udc->cap_regs->dccparams) & DCCPARAMS_DEN_MASK;
/*
* some platform will use usb to download image, it may not disconnect
* usb gadget before loading kernel. So first stop udc here.
*/
udc_stop(udc);
writel(0xFFFFFFFF, &udc->op_regs->usbsts);
size = udc->max_eps * sizeof(struct mv_dqh) *2;
size = (size + DQH_ALIGNMENT - 1) & ~(DQH_ALIGNMENT - 1);
udc->ep_dqh = dma_alloc_coherent(&dev->dev, size,