diff mbox

[U-Boot,v2,3/6] usb:udc:samsung: Allow burst transfers for non EP0 endpints

Message ID 1391591446-17843-4-git-send-email-l.majewski@samsung.com
State Accepted
Delegated to: Marek Vasut
Headers show

Commit Message

Łukasz Majewski Feb. 5, 2014, 9:10 a.m. UTC 
This patch removed obscure restriction on the HW setting of DMA transfers.
Before this change each transaction sent up to 512 bytes (with packet count
equal to 1) for non EP0 transfer.

Now it is possible to setup DMA transaction up to DMA_BUFFER_SIZE.

Test condition
- test HW + measurement: Trats - Exynos4210 rev.1
- test HW Trats2 - Exynos4412 rev.1
400 MiB compressed rootfs image download with `thor 0 mmc 0`

Measurement:
Transmission speed: 20.74 MiB/s

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Cc: Marek Vasut <marex@denx.de>

---
Changes for v2:
- Remove Change-Id:
---
 drivers/usb/gadget/s3c_udc_otg_xfer_dma.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)
diff mbox

Patch

diff --git a/drivers/usb/gadget/s3c_udc_otg_xfer_dma.c b/drivers/usb/gadget/s3c_udc_otg_xfer_dma.c
index cbc8734..7c7176b 100644
--- a/drivers/usb/gadget/s3c_udc_otg_xfer_dma.c
+++ b/drivers/usb/gadget/s3c_udc_otg_xfer_dma.c
@@ -97,18 +97,17 @@  static int setdma_rx(struct s3c_ep *ep, struct s3c_request *req)
 	u32 ep_num = ep_index(ep);
 
 	buf = req->req.buf + req->req.actual;
-
-	length = min(req->req.length - req->req.actual, (int)ep->ep.maxpacket);
+	length = min(req->req.length - req->req.actual,
+		     ep_num ? DMA_BUFFER_SIZE : ep->ep.maxpacket);
 
 	ep->len = length;
 	ep->dma_buf = buf;
 
-	if (length == 0)
+	if (ep_num == EP0_CON || length == 0)
 		pktcnt = 1;
 	else
 		pktcnt = (length - 1)/(ep->ep.maxpacket) + 1;
 
-	pktcnt = 1;
 	ctrl =  readl(&reg->out_endp[ep_num].doepctl);
 
 	writel(the_controller->dma_addr[ep_index(ep)+1],