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

[Bo Shen <voice.shen@atmel.com>]

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.

Best Regards,
Bo Shen