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>

diff --git a/drivers/usb/gadget/mv_udc_core.c b/drivers/usb/gadget/mv_udc_core.c
index cd4de00a3ff5b87136872a3d031c424384ebc8ab..84655289aea98c812f11f33b24bd46bb50d83ab6 100644 (file)
--- a/drivers/usb/gadget/mv_udc_core.c
+++ b/drivers/usb/gadget/mv_udc_core.c
@@ -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,