sysmo-bts
/
u-boot
9
0
Fork 0
Code Pull Requests Releases Activity

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>
This commit is contained in:
Lukasz Majewski 2014-02-05 10:10:43 +01:00 committed by Marek Vasut
parent 716662bd19
commit 9c9822188c
1 changed files with 3 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/usb/gadget/s3c_udc_otg_xfer_dma.c
View File

@ -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],