Hi Andy, andy_purcell@xxxxxxxxxxxx writes: > Hello, > > I am starting work on a board that has the Intel Skylake chipset, > which has hardware for doing USB-device. Not all SKLs have dwc3 enabled. Can you provide the output of lspci? > The Intel chipset USB-device hardware is the Synopsys DesignWare > Controller 3, aka "dwc3". > > The Linux source tree has code for dwc3, so I thought to try running > Linux on this board. > > The USB-device function is hard-wired on my board to be USB-device. > Cannot be OTG. Cannot be USB-host. fair enough > I boot Ubuntu Desktop 16.04, kernel = 4.4.0-59, to test the USB-device function. I need to ask you to try a newer kernel. Can you try v4.9.6 or v4.10-rc6? > Using a script, I set up the USB-device to be RNDIS, using functionfs. functionfs needs a userspace component, do you have that? Can you try any other gadget driver like mass storage, for instance? Here's a quick script for mass storage: #!/bin/sh dd if=/dev/zero of=/dev/shm/file bs=1M count=1024 mount -t configfs none /c mkdir /c/usb_gadget/g1 echo 0x18d1 > /c/usb_gadget/g1/idVendor echo 0xbeef > /c/usb_gadget/g1/idProduct mkdir /c/usb_gadget/g1/strings/0x409 echo 123456789012 > /c/usb_gadget/g1/strings/0x409/serialnumber echo "Intel Corporation" > /c/usb_gadget/g1/strings/0x409/manufacturer echo "Joule" > /c/usb_gadget/g1/strings/0x409/product mkdir /c/usb_gadget/g1/functions/mass_storage.1 mkdir /c/usb_gadget/g1/configs/b.1 mkdir /c/usb_gadget/g1/configs/b.1/strings/0x409 echo 500 > /c/usb_gadget/g1/configs/b.1/MaxPower echo /dev/shm/file > /c/usb_gadget/g1/functions/mass_storage.1/lun.0/file ln -s /c/usb_gadget/g1/functions/mass_storage.1 /c/usb_gadget/g1/configs/b.1/f1 echo dwc3.0.auto > /c/usb_gadget/g1/UDC > I connect a USB cable from my board to a USB-host. > My USB analyzer shows nothing happens. No connection, no SETUP > packets, nothing. right, I'm assuming you don't have userspace component for functionfs, so ->pullup() is never called. > To troubleshoot, I try turning on some test modes, using the Linux debugfs interface. > The debugfs interface is in this directory: > /sys/kernel/debug/dwc3.0.auto > I see link_state, mode, regdump, testmode files. Can you also get the output of: grep DCTL regdump > * echo "test_j" > testmode > I see D+ go high, D- stays low. > * echo "test_k" > testmode > No change on D+ > No change on D- > This is not correct. > * echo "test_se0_nak" > testmode > No changes. > * echo "test_packet" > D+ goes low, D- remains low. > > OK, so here are my questions. > > 1) Should I expect Ubuntu 16.04 dwc3 code to work? > (uname -a shows kernel level is 4.4.0-59) > I ask, because kernel.org shows recent changes in dwc3 code. if you enabled the driver, it should work, yes. Now we just need to make you have all the other pieces. > 2) The Linux dwc3 code appears to be written to work with several different USB phy's. > I see dwc3-exynos.c, dwc3-keystone.c, dwc3-omap.c, dwc3-pci.c, dwc3-of-simple.c, etc. > The schematic for my board shows there is no external USB2 phy and no external USB3 phy. you don't need to worry about that AFAICT :-) > For my board, the phy's are internal to the Skylake chipset. > a. Should the Linux dwc3 code work without an external phy? > b. Is there some configuration I need to do for my board? most likely, no. BIOS is likely handling that for you. -- balbi
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