Hello,
22.01.2012 1:40, I wrote:
[...]
if matters). Without that, controller starts raising IN Token Received
with EP mismatch instead of normal Transfer complete bit. If I
understand it correctly, this means that Tx FIFO happened to be filled
in some particular order that controller disliked (and refused). I've
also found a fragment of code with possibly relevant comment (quoted
below). Indeed, apparently this EP mismatch event is not handled
anywhere in the driver (other than providing a line for dmesg). If it
should, then I'd guess it means the driver is just plain unfininshed and
I have no idea if it can even be fixed with a reasonable effort. Not
Nevermind. I've meanwhile found some code crafted by Amlogic (or whoever
it was) addressing exactly this problem. It does not work well because
it is buggy, however the idea is simple enough: do not push data to Tx
FIFO if it still holds some previous unsent data for another EP. I think
I can fix this workaround to actually do what it tries to.
(This somewhat reduces the whole usefullness of EPs probably, but at
least the damned thing stops throwing EP mismatch, I've checked)
Thank you.
NIkolai
sure what was meant exactly by one endpoint at once though.. Of course
usefull gadget drivers would probably employ 1 EPs, even
g_file_storage does so? Strange thing.
Thank you.
Nikolai
/* Reactive the EP */
dwc_otg_ep_activate(GET_CORE_IF(pcd), ep-dwc_ep);
if (ep-stopped) {
ep-stopped = 0;
/* If there is a request in the EP queue start it */
/** @todo FIXME: this causes an EP mismatch in DMA mode.
* epmismatch not yet implemented. */
/*
* Above fixme is solved by implmenting a tasklet to call the
* start_next_request(), outside of interrupt context at some
* time after the current time, after a clear-halt setup packet.
* Still need to implement ep mismatch in the future if a gadget
* ever uses more than one endpoint at once
*/
ep-queue_sof = 1;
tasklet_schedule (pcd-start_xfer_tasklet);
}
/* Start Control Status Phase */
do_setup_in_status_phase(pcd);
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