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

[Marek Vasut <marex@denx.de>]

On Thursday, September 18, 2014 at 03:34:18 AM, Bo Shen wrote:
> Hi Marek,
> 
> On 09/17/2014 07:16 PM, Marek Vasut wrote:
> > 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 ?
> 
> As I described in the commit message. If the transfer length is not
> exactly the same as the request length, then the old method
>    "download_bytes % BYTES_PER_DOT"
> won't be 0 anymore, so for the following transfer, it won't print dot
> anymore.

And can you not reset the "download_bytes" for each transfer ?

Maybe we're not even aligned on what "transfer" means, so we might want to sync 
on this word first. What does "transfer" mean in this case?