usb:udc:samsung: Allow burst transfers for non EP0 endpints

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>

diff --git a/drivers/usb/gadget/s3c_udc_otg_xfer_dma.c b/drivers/usb/gadget/s3c_udc_otg_xfer_dma.c
index cbc8734af3b8d73032f2535f92e0c388db262ed9..7c7176bfd3c81483daf978591de4eb75606c3bcb 100644 (file)
--- 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],