USB: gadget: imx_udc: don't queue more data when zlp is to be sent

When a zero-length packet has been requested and another packet is
written into the fifo, the MX1 tends to send the first byte of the
previous packet instead of the first byte of the current packet.
The CRC is adjusted accordingly so that this packet is _not_
discarded by the host.

Waiting for the ZLPS bit to clear avoids these bad packets.

Signed-off-by: Daniel Glöckner <dg@emlix.com>
Cc: Darius Augulis <augulis.darius@gmail.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/gadget/imx_udc.c b/drivers/usb/gadget/imx_udc.c
index 239bf8e..c52a681 100644 (file)
--- a/drivers/usb/gadget/imx_udc.c
+++ b/drivers/usb/gadget/imx_udc.c
@@ -415,6 +415,13 @@ static int write_packet(struct imx_ep_struct *imx_ep, struct imx_request *req)
        u8      *buf;
        int     length, count, temp;
 
+       if (unlikely(__raw_readl(imx_ep->imx_usb->base +
+                                USB_EP_STAT(EP_NO(imx_ep))) & EPSTAT_ZLPS)) {
+               D_TRX(imx_ep->imx_usb->dev, "<%s> zlp still queued in EP %s\n",
+                       __func__, imx_ep->ep.name);
+               return -1;
+       }
+
        buf = req->req.buf + req->req.actual;
        prefetch(buf);