On Tue, 26 Jan 2016, Noralf Trønnes wrote: > > I installed the rpi-4.4.y branch from the > > https://github.com/raspberrypi/linux repository. As is, it generated a > > working kernel. Then I tried editing the config; I removed > > CONFIG_USB_DWCOTG and added CONFIG_USB_DWC2 and CONFIG_USB_DWC2_HOST. > > However, when I booted the resulting kernel it didn't seem to detect > > the host controller at all. No USB devices were probed, which meant no > > working ethernet or keyboard. > > > > Then I tried enabling both drivers in the config. That worked, but the > > controller was bound to dwc_otg, not to dwc2. > > > > I get the feeling that some magic DT incantation is missing, although I > > have no idea what. The base bcm2709-rpi-2-b.dtb wasn't affected by the > > config change, nor was the overlays/dwc2-overlay.dtb file. > > > > Any suggestions? > > Have you enabled the dwc2 overlay? > Add to /boot/config.txt: > dtoverlay=dwc2 That did it! Thank you. The dwc2 driver seems to do a better job than dwc_otg -- at least, it sends Clear-TT-Buffer requests after each failure. Doug, do you have a list of patches you'd like me to try on top of the rpi-4.4.y branch? Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
