Some platform will use usb to download image, it may not disconnect usb gadget in uboot before loading kernel. In some cases, it may pending an interrupt there, and it will be triggered immediately when we finish request irq. But we haven't finished init the device at this time. So first stop udc here to ensure that udc is stopped before we probe the device in kernel. Signed-off-by: Neil Zhang <zhangwm@xxxxxxxxxxx> --- drivers/usb/gadget/mv_udc_core.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/drivers/usb/gadget/mv_udc_core.c b/drivers/usb/gadget/mv_udc_core.c index 2153da1..fce4236 100644 --- a/drivers/usb/gadget/mv_udc_core.c +++ b/drivers/usb/gadget/mv_udc_core.c @@ -2038,6 +2038,13 @@ 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, -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
