[U-Boot] [PATCH] usb: gadget: fastboot: improve download progress bar

[Marek Vasut <marex@denx.de>]

On Wednesday, September 17, 2014 at 12:28:57 PM, Bo Shen wrote:
> Hi Marek,
> 
> On 09/17/2014 06:10 PM, Marek Vasut wrote:
> > On Wednesday, September 17, 2014 at 09:43:56 AM, Bo Shen wrote:
> > 
> > +CC Lukasz, this is his turf.
> > 
> >> When download is ongoing, if the actual size of one transfer
> >> is not the same as BTYES_PER_DOT, which will cause the dot
> >> won't print anymore. Then it will let the user thinking it
> >> is stuck, actually it is transfering without dot printed.
> >> 
> >> So, improve the method to show the progress bar (print dot).
> >> 
> >> Signed-off-by: Bo Shen <voice.shen@atmel.com>
> >> ---
> >> 
> >>   drivers/usb/gadget/f_fastboot.c | 7 +++++--
> >>   1 file changed, 5 insertions(+), 2 deletions(-)
> >> 
> >> diff --git a/drivers/usb/gadget/f_fastboot.c
> >> b/drivers/usb/gadget/f_fastboot.c index 7a1acb9..2f13bf0 100644
> >> --- a/drivers/usb/gadget/f_fastboot.c
> >> +++ b/drivers/usb/gadget/f_fastboot.c
> >> @@ -51,6 +51,7 @@ 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 unsigned int num_of_dot;
> >> 
> >>   static struct usb_endpoint_descriptor fs_ep_in = {
> >>   
> >>   	.bLength            = USB_DT_ENDPOINT_SIZE,
> >> 
> >> @@ -414,9 +415,10 @@ static void rx_handler_dl_image(struct usb_ep *ep,
> >> struct usb_request *req) req->length = ep->maxpacket;
> >> 
> >>   	}
> >> 
> >> -	if (download_bytes && !(download_bytes % BYTES_PER_DOT)) {
> >> +	if (download_bytes && ((download_bytes / BYTES_PER_DOT) > num_of_dot))
> >> { +		num_of_dot = download_bytes / BYTES_PER_DOT;
> >> 
> >>   		putc('.');
> >> 
> >> -		if (!(download_bytes % (74 * BYTES_PER_DOT)))
> >> +		if (!(num_of_dot % 74))
> >> 
> >>   			putc('\n');
> >>   	
> >>   	}
> >>   	req->actual = 0;
> >> 
> >> @@ -431,6 +433,7 @@ static void cb_download(struct usb_ep *ep, struct
> >> usb_request *req) strsep(&cmd, ":");
> >> 
> >>   	download_size = simple_strtoul(cmd, NULL, 16);
> >>   	download_bytes = 0;
> >> 
> >> +	num_of_dot = 0;
> > 
> > Make it a 'download_total' and log the total amount of bytes transferred
> > please, that way it can be re-used for other purposes in the future ;
> > for example for printing how much data were already transferred ;-)
> 
> The download_bytes record the total amount of bytes transferred.
> And the download_bytes will print after finishing transfer.

So why can this not be used to indicate the total progress ? Because the 
transfeer speed is variating too much ?