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usb:hsotg:samsung: NAK management for EP0 (Setup stage of control transfers) 

For SETUP stage of USB control transmission, the NAK shall NOT be
CLEAR.

The SNAK/CNAK control is crucial for this type of driver,
since data arrives to earlier defined requests.

Tested with:
- DFU gadget (various size of the sent data - also packet = MPS)
- Ethernet gadget (CDC and RNDIS)
- Multi Function Gadget (g_multi)

HW:
- Samsung's C210 Universal rev.0

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Lukasz Majewski 2012-05-04 14:17:03 +02:00 committed by Felipe Balbi
parent fc9a731ed0
commit 71225beeeb
1 changed files with 19 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/usb/gadget/s3c-hsotg.c
View File

@ -147,6 +147,7 @@ struct s3c_hsotg_ep {
* @ep0_buff: Buffer for EP0 reply data, if needed.
* @ctrl_buff: Buffer for EP0 control requests.
* @ctrl_req: Request for EP0 control packets.
* @setup: NAK management for EP0 SETUP
* @eps: The endpoints being supplied to the gadget framework
*/
struct s3c_hsotg {
@ -173,6 +174,7 @@ struct s3c_hsotg {
u8 ctrl_buff[8];
struct usb_gadget gadget;
unsigned int setup;
struct s3c_hsotg_ep eps[];
};
@ -696,7 +698,8 @@ static void s3c_hsotg_start_req(struct s3c_hsotg *hsotg,
}
length = ureq->length - ureq->actual;
dev_dbg(hsotg->dev, "ureq->length:%d ureq->actual:%d\n",
ureq->length, ureq->actual);
if (0)
dev_dbg(hsotg->dev,
"REQ buf %p len %d dma 0x%08x noi=%d zp=%d snok=%d\n",
@ -762,7 +765,15 @@ static void s3c_hsotg_start_req(struct s3c_hsotg *hsotg,
ctrl |= S3C_DxEPCTL_EPEna; /* ensure ep enabled */
ctrl |= S3C_DxEPCTL_USBActEp;
ctrl |= S3C_DxEPCTL_CNAK; /* clear NAK set by core */
dev_dbg(hsotg->dev, "setup req:%d\n", hsotg->setup);
/* For Setup request do not clear NAK */
if (hsotg->setup && index == 0)
hsotg->setup = 0;
else
ctrl |= S3C_DxEPCTL_CNAK; /* clear NAK set by core */
dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x\n", __func__, ctrl);
writel(ctrl, hsotg->regs + epctrl_reg);
@ -1527,6 +1538,12 @@ static void s3c_hsotg_handle_outdone(struct s3c_hsotg *hsotg,
if (req->actual < req->length && size_left == 0) {
s3c_hsotg_start_req(hsotg, hs_ep, hs_req, true);
return;
} else if (epnum == 0) {
/*
* After was_setup = 1 =>
* set CNAK for non Setup requests
*/
hsotg->setup = was_setup ? 0 : 1;
}
if (req->actual < req->length && req->short_not_ok) {