On Thu, Jan 16, 2025 at 11:18:45PM +0000, Thinh Nguyen wrote: > On Thu, Jan 16, 2025, Andy Shevchenko wrote: > > On some platforms (Intel-based and AFAIK ARM-based) the EPs in the gadget > > (USB Device Controller mode) may be reserved for some special means, such as > > tracing. This series extends DT schema and driver to avoid using those. > > Without this the USB gadget mode won't work properly (those devices that > > "luckily" allocated the reserved EPs). > > > > Ferry already tested the privately sent PoC of this, but I ask him again to > > re-test this version which is slightly different. ... > I'm not entirely clear on the reason for this change yet. > > How would this even work without dwc3 managing these endpoints (all the > init/teardown/fifo allocation/start/stop flow). You perhaps know much better how it can be done, I have access to a limited documentation and in practice if those endpoints are not skipped any gadget that allocates them simply won't work, and IIRC the entire USB transfers are stuck. > Can you provide more info on this hardware? I am afraid I can't provide more, sorry. I can look for some specifics, but I'm not that guy who know anything about in-SoC tracing. -- With Best Regards, Andy Shevchenko
