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authorValentin Longchamp <valentin.longchamp@keymile.com>2011-03-23 17:47:00 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2011-04-13 15:57:19 -0700
commitd834508e159fe8936f9e7fd941b1e2fe9a209d4b (patch)
treebdf1a95de3009fd17a7863907b593a92466f0ab8 /drivers
parentcb62d65f966146a39fdde548cb474dacf1d00fa5 (diff)
USB: fsl_qe_udc: send ZLP when zero flag and length % maxpacket == 0
The driver did not take the zero flag in the USB request. If the request length is the same as the endpoint's maxpacket, an additional ZLP with no data has to be transmitted. The method used here is inspired to what is done in fsl_udc_core.c (and pxa27x_udc.c and at91_udc.c) where this is supported. There already was a discussion about this topic with people from Keymile, and I propose here a better implementation: http://thread.gmane.org/gmane.linux.usb.general/38951 Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com> Acked-by: Li Yang <leoli@freescale.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/usb/gadget/fsl_qe_udc.c20
1 files changed, 18 insertions, 2 deletions
diff --git a/drivers/usb/gadget/fsl_qe_udc.c b/drivers/usb/gadget/fsl_qe_udc.c
index aee7e3c53c38..36613b37c504 100644
--- a/drivers/usb/gadget/fsl_qe_udc.c
+++ b/drivers/usb/gadget/fsl_qe_udc.c
@@ -1148,6 +1148,12 @@ static int qe_ep_tx(struct qe_ep *ep, struct qe_frame *frame)
static int txcomplete(struct qe_ep *ep, unsigned char restart)
{
if (ep->tx_req != NULL) {
+ struct qe_req *req = ep->tx_req;
+ unsigned zlp = 0, last_len = 0;
+
+ last_len = min_t(unsigned, req->req.length - ep->sent,
+ ep->ep.maxpacket);
+
if (!restart) {
int asent = ep->last;
ep->sent += asent;
@@ -1156,9 +1162,18 @@ static int txcomplete(struct qe_ep *ep, unsigned char restart)
ep->last = 0;
}
+ /* zlp needed when req->re.zero is set */
+ if (req->req.zero) {
+ if (last_len == 0 ||
+ (req->req.length % ep->ep.maxpacket) != 0)
+ zlp = 0;
+ else
+ zlp = 1;
+ } else
+ zlp = 0;
+
/* a request already were transmitted completely */
- if ((ep->tx_req->req.length - ep->sent) <= 0) {
- ep->tx_req->req.actual = (unsigned int)ep->sent;
+ if (((ep->tx_req->req.length - ep->sent) <= 0) && !zlp) {
done(ep, ep->tx_req, 0);
ep->tx_req = NULL;
ep->last = 0;
@@ -1191,6 +1206,7 @@ static int qe_usb_senddata(struct qe_ep *ep, struct qe_frame *frame)
buf = (u8 *)ep->tx_req->req.buf + ep->sent;
if (buf && size) {
ep->last = size;
+ ep->tx_req->req.actual += size;
frame_set_data(frame, buf);
frame_set_length(frame, size);
frame_set_status(frame, FRAME_OK);

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