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fastboot: OUT transaction length must be aligned to wMaxPacketSize

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OUT transactions must be aligned to wMaxPacketSize for each transfer,
or else transfer will not complete successfully. This patch modifies
rx_bytes_expected to return a transfer length that is aligned to
wMaxPacketSize.

Note that the value of wMaxPacketSize and ep->maxpacket may not be
the same value, and it is the value of wMaxPacketSize that should be
used for alignment. wMaxPacketSize is passed depending on the speed of
connection.

Signed-off-by: Dileep Katta <dileep.katta@linaro.org>
Reviewed-by: Lukasz Majewski <l.majewski@samsung.com>
This commit is contained in:
Dileep Katta 2015-02-17 02:02:36 +05:30 committed by Marek Vasut
parent 7c23bcb93f
commit 9e4b510d40
1 changed files with 22 additions and 5 deletions
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27
drivers/usb/gadget/f_fastboot.c
View file

@ -55,6 +55,7 @@ static inline struct f_fastboot *func_to_fastboot(struct usb_function *f)
static struct f_fastboot *fastboot_func;
static unsigned int download_size;
static unsigned int download_bytes;
static bool is_high_speed;
static struct usb_endpoint_descriptor fs_ep_in = {
.bLength = USB_DT_ENDPOINT_SIZE,
@ -219,10 +220,13 @@ static int fastboot_set_alt(struct usb_function *f,
__func__, f->name, interface, alt);
/* make sure we don't enable the ep twice */
if (gadget->speed == USB_SPEED_HIGH)
if (gadget->speed == USB_SPEED_HIGH) {
ret = usb_ep_enable(f_fb->out_ep, &hs_ep_out);
else
is_high_speed = true;
} else {
ret = usb_ep_enable(f_fb->out_ep, &fs_ep_out);
is_high_speed = false;
}
if (ret) {
puts("failed to enable out ep\n");
return ret;
@ -370,13 +374,20 @@ static void cb_getvar(struct usb_ep *ep, struct usb_request *req)
fastboot_tx_write_str(response);
}
static unsigned int rx_bytes_expected(void)
static unsigned int rx_bytes_expected(unsigned int maxpacket)
{
int rx_remain = download_size - download_bytes;
int rem = 0;
if (rx_remain < 0)
return 0;
if (rx_remain > EP_BUFFER_SIZE)
return EP_BUFFER_SIZE;
if (rx_remain < maxpacket) {
rx_remain = maxpacket;
} else if (rx_remain % maxpacket != 0) {
rem = rx_remain % maxpacket;
rx_remain = rx_remain + (maxpacket - rem);
}
return rx_remain;
}
@ -388,6 +399,7 @@ static void rx_handler_dl_image(struct usb_ep *ep, struct usb_request *req)
const unsigned char *buffer = req->buf;
unsigned int buffer_size = req->actual;
unsigned int pre_dot_num, now_dot_num;
unsigned int max;
if (req->status != 0) {
printf("Bad status: %d\n", req->status);
@ -425,7 +437,9 @@ static void rx_handler_dl_image(struct usb_ep *ep, struct usb_request *req)
printf("\ndownloading of %d bytes finished\n", download_bytes);
} else {
req->length = rx_bytes_expected();
max = is_high_speed ? hs_ep_out.wMaxPacketSize :
fs_ep_out.wMaxPacketSize;
req->length = rx_bytes_expected(max);
if (req->length < ep->maxpacket)
req->length = ep->maxpacket;
}
@ -438,6 +452,7 @@ static void cb_download(struct usb_ep *ep, struct usb_request *req)
{
char *cmd = req->buf;
char response[RESPONSE_LEN];
unsigned int max;
strsep(&cmd, ":");
download_size = simple_strtoul(cmd, NULL, 16);
@ -453,7 +468,9 @@ static void cb_download(struct usb_ep *ep, struct usb_request *req)
} else {
sprintf(response, "DATA%08x", download_size);
req->complete = rx_handler_dl_image;
req->length = rx_bytes_expected();
max = is_high_speed ? hs_ep_out.wMaxPacketSize :
fs_ep_out.wMaxPacketSize;
req->length = rx_bytes_expected(max);
if (req->length < ep->maxpacket)
req->length = ep->maxpacket;
}