Hi On Mon, Dec 8, 2014 at 8:50 AM, Florian Echtler <floe@xxxxxxxxxxxxxx> wrote: > Hello everyone, > > I'm preparing to finally add support for the raw sensor video stream to > my driver for the SUR40 touchscreen. However, after an extensive amount > of Googling, I'm still not clear on the relationship between DMA > transfers, the USB core and the videobuf2 framework. > > Specifically, I'd like to know: > > - Can I always use DMA on the USB side (for bulk transfers), or does > this in any way require support from the USB device's hardware? (I'm > guessing no, but a definite answer would be great.) I thought the USB API hides that from you? Nevertheless, this is a question for linux-usb, not linux-input. I put some people on CC which work on both, HID and USB. Maybe they can help you. > - Regardless of the USB side of things, can I use the videobuf2 > framework without _having_ to use DMA? That way, I could get a basic > driver running without DMA and switch later when it's convenient and/or > the speedup is justified. This is definitely a question for linux-media. Thanks David -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
