Hi, On Tue, Jan 26, 2016 at 10:22 AM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > 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? Nice! You can give this series a try. It aims to improve SPLIT scheduling quite a bit: 8091691 New [v5,01/21] usb: dwc2: rockchip: Make the max_transfer_size automatic 8091701 New [v5,02/21] usb: dwc2: host: Get aligned DMA in a more supported way 8092101 New [v5,03/21] usb: dwc2: host: Set host_rx_fifo_size to 528 for rk3066 8092091 New [v5,04/21] usb: dwc2: host: Set host_perio_tx_fifo_size to 304 for rk3066 8092081 New [v5,05/21] usb: dwc2: host: Avoid use of chan->qh after qh freed 8092071 New [v5,06/21] usb: dwc2: host: Always add to the tail of queues 8092061 New [v5,07/21] usb: dwc2: hcd: fix split transfer schedule sequence 8091761 New [v5,08/21] usb: dwc2: host: Add scheduler tracing 8092051 New [v5,09/21] usb: dwc2: host: Add a delay before releasing periodic bandwidth 8092041 New [v5,10/21] usb: dwc2: host: Giveback URB in tasklet context 8092031 New [v5,11/21] usb: dwc2: host: Use periodic interrupt even with DMA 8092021 New [v5,12/21] usb: dwc2: host: Rename some fields in struct dwc2_qh 8092011 New [v5,13/21] usb: dwc2: host: Reorder things in hcd_queue.c 8092001 New [v5,14/21] usb: dwc2: host: Split code out to make dwc2_do_reserve() 8091991 New [v5,15/21] usb: dwc2: host: Add scheduler logging for missed SOFs 8091821 New [v5,16/21] usb: dwc2: host: Manage frame nums better in scheduler 8091831 New [v5,17/21] usb: dwc2: host: Schedule periodic right away if it's time 8091971 New [v5,18/21] usb: dwc2: host: Add dwc2_hcd_get_future_frame_number() call 8091961 New [v5,19/21] usb: dwc2: host: Properly set even/odd frame 8091981 New [v5,20/21] usb: dwc2: host: Totally redo the microframe scheduler 8091951 New [v5,21/21] usb: dwc2: host: If using uframe scheduler, end splits better Plus grab: 8094921 New usb: dwc2: host: Properly set the HFIR You could ignore the two rk3066 patches, though they won't hurt you. Hopefully you also saw the note that you should pick the two patches: http://marc.info/?l=linux-usb&m=145255851516121&w=2 -- 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
