On Tue, 28 Apr 2020, Andrey Konovalov wrote: > Hi Alan, > > This patch uses the approach that I mentioned in the discussion about > endpoint selection. Does this look acceptable? I haven't had time to look through it yet. > I'm not sure which endpoint limits it makes sense to expose via > USB_RAW_IOCTL_EPS_INFO. I'm more or less sure about maxpacket_limit > and max_streams, but I don't exactly know what maxburst is used for. > Maybe there are some others? maxburst is a USB-3 thing. It mainly affects just throughput, not functionality, and it's handled pretty much entirely by the hardware. You shouldn't worry about it, at least, not now. > I also wonder if we need to expose ep0 limits via USB_RAW_IOCTL_EPS_INFO too. > expose ep0 parameters? I don't think there are any significant attributes for ep0. In general, gadget drivers have to live with what the hardware supports -- or else fail to run at all. After all, the driver can't substitute a different endpoint for ep0. Alan Stern
