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

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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>
This commit is contained in:
Daniel Glöckner 2009-05-28 13:00:14 +02:00 committed by Greg Kroah-Hartman
parent 2e25134122
commit 680cc64557
1 changed files with 7 additions and 0 deletions
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7
drivers/usb/gadget/imx_udc.c
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@ -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);