From: Bo Shen Date: Mon, 15 Dec 2014 10:12:47 +0000 (+0800) Subject: USB: gadget: atmel_usba_udc: fix transfer hang issue X-Git-Tag: v2015.01-rc4~17^2~7 X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=68ae882596524a2dde9da73283241b01d56375d5;p=u-boot USB: gadget: atmel_usba_udc: fix transfer hang issue When receive data, the RXRDY in status register set by hardware after a new packet has been stored in the endpoint FIFO. After, we copy from FIFO, we clear it, make the FIFO can be accessed again. In the receive_data() function, this bit RXRDY has been cleared. So, after the receive_data() function return, this bit should not be cleared again, or else it will cause the accessing FIFO corrupt, which will make the data loss. Signed-off-by: Bo Shen --- diff --git a/drivers/usb/gadget/atmel_usba_udc.c b/drivers/usb/gadget/atmel_usba_udc.c index 12628effe8..fbc74f3bed 100644 --- a/drivers/usb/gadget/atmel_usba_udc.c +++ b/drivers/usb/gadget/atmel_usba_udc.c @@ -1062,7 +1062,6 @@ static void usba_ep_irq(struct usba_udc *udc, struct usba_ep *ep) if ((epstatus & epctrl) & USBA_RX_BK_RDY) { DBG(DBG_BUS, "%s: RX data ready\n", ep->ep.name); receive_data(ep); - usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY); } }