Hi, On Sat, Feb 14, 2015 at 3:25 AM, Hans de Goede <hdego...@redhat.com> wrote: > Hi All, > > I'm happy to report that after a lot of poking at the Allwinner > musb code I've it working reliable in both host and peripheral mode, > as well as automatically switching between the 2 depending on which > cable gets plugged.
Many thanks for finishing this. > My wip code is available here: > > https://github.com/jwrdegoede/linux-sunxi/commits/sunxi-wip > > Functionality wise this is complete and I expect / hope there will be > no functional changes before it goes upstream. > > There are 2 things which need to be done before it can be submitted > upstream though: > > 1) All the ForceVbus / ForceID stuff needs to be cleaned up > 2) Currently this is not suitable for multiplatform kernels as it > puts a #ifdef MACH_SUNXI in musb_regs.h, this needs to be fixed. > > 1) is just a matter of removing a whole lot of unnecessary indirection > in the code, and giving the relevant defines better names There's the issue of the glue registers being in the address space of the usb phy driver. That part could be part of a usb-phy device, but would require some notifier between the usb-phy and musb. I got stuck trying to figure out that bit. But I think it's doable. > 2) I've a plan for, I just need some time for this. > > I've so far only tested this on a cubietruck, I started development on > a cubieboard, but the cubieboard has the Vusb hardwired to the 5V of the > board (or at least mine does) meaning that the Vusb enable gpio does not > do anything, and Vusb-detect always reads as 1, I think my current code > may work despite this, but I need to test. > > Note that the dts modifications for the cubietruck / cubieboard enable > the musb controller in otg mode, which means that it will not "start" > until a gadget driver is loaded. For testing I use: > > insmod libcomposite.ko > insmod u_serial.ko > insmod usb_f_acm.ko > insmod g_serial.ko I don't suppose there is a way to get it working with the gadget driver builtin? Anyway, I cherry-picked your patches onto sunxi-next and have it working on my A13 tablet if built as modules. See https://github.com/wens/linux/commits/hans-sunxi-otg Regards ChenYu > After this you should see 2 messages like this: > > [ 3528.872816] g_serial gadget: Gadget Serial v2.4 > [ 3528.877377] g_serial gadget: g_serial ready > > And then the controller should work either as a usb serial > port (ttyGS0 on cubietruck side, ttyACM0 on pc version) > or as a usb host, depending on what you plug in, and you should > be able to switch on the fly. > > I use the following on the cubietruck side to start a getty > on the usb serial, this assumes you use systemd :) > > systemctl start serial-getty@ttyGS0.service > > If you put this in say rc.local, then you can use it to > get a console on a tablet over the otg connector, which is > very useful for debugging stuff. > > Regards, > > Hans -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
