On Tue, 13 Jul 2010 16:33:02 +0200, Shivdas Gujare <shivdas.tech@xxxxxxxxx> wrote:
Hi,
Is there any factor which decides "how may requests should be
allocated for certain endpoint?"
for. ex, most of gadget driver's have a kind of for loop like
for (i=0; i < number_of_requests; i ++) {
usb_ep_alloc_request(ep, GFP_ATOMIC);
}
so, which factor decides what should be the value of
"number_of_requests" in above for loop, if we want to write a new
gadget driver?
Thanks for the help.
More buffers allow for double-or-more buffering. If you are writing a new
driver just stick to one request. If things starts working try to add more
requests for better buffering. How many exactly, I'm probably not the best
person to answer but I'd say as many as it'll take to keep the hardware busy
all the time. This is pretty protocol and gadget dependent.
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