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usb: gadget: f_sourcesink: format data pattern according to max packet size

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Since the host and gadget can't agree with transfer length before
each transfer, but they agree with max packet size for each
endpoint, we use max packet size to format data pattern.

Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Peter Chen 2015-09-01 09:48:02 +08:00 committed by Felipe Balbi
parent b9a6e8e100
commit 046839098c
1 changed files with 4 additions and 2 deletions
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6
drivers/usb/gadget/function/f_sourcesink.c
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@ -489,6 +489,7 @@ static int check_read_data(struct f_sourcesink *ss, struct usb_request *req)
unsigned i;
u8 *buf = req->buf;
struct usb_composite_dev *cdev = ss->function.config->cdev;
int max_packet_size = le16_to_cpu(ss->out_ep->desc->wMaxPacketSize);
if (pattern == 2)
return 0;
@ -510,7 +511,7 @@ static int check_read_data(struct f_sourcesink *ss, struct usb_request *req)
* stutter for any reason, including buffer duplication...)
*/
case 1:
if (*buf == (u8)(i % 63))
if (*buf == (u8)((i % max_packet_size) % 63))
continue;
break;
}
@ -525,6 +526,7 @@ static void reinit_write_data(struct usb_ep *ep, struct usb_request *req)
{
unsigned i;
u8 *buf = req->buf;
int max_packet_size = le16_to_cpu(ep->desc->wMaxPacketSize);
switch (pattern) {
case 0:
@ -532,7 +534,7 @@ static void reinit_write_data(struct usb_ep *ep, struct usb_request *req)
break;
case 1:
for (i = 0; i < req->length; i++)
*buf++ = (u8) (i % 63);
*buf++ = (u8) ((i % max_packet_size) % 63);
break;
case 2:
break;