On Thu, 26 May 2016, Martin Townsend wrote: > Hi, > > I'm currently trying to get the USB Host working on the SH7760. I > tried the platform driver to start with and get the following error on > boot: > [ 3.600000] usb 1-1: new full-speed USB device number 2 using ohci-platform > [ 3.872000] ohci-platform ohci-platform: frame counter not updating; disabled > [ 3.872000] ohci-platform ohci-platform: HC died; cleaning up > > So I dug a bit further and see that the SH7760 driver in the 2.6 > kernel makes use of the 8KB shared memory for HCCA and ED/TD buffers. > After looking through the code for the 4.1 Kernel I am currently > trying to port to I think I need to write my own platform driver that > calls dma_declare_coherent_memory so that the OHCI driver uses this > 8KB shared memory. Then set HCD_LOCAL_MEM in the hc_driver flags to > ensure that it uses dma_alloc_coherent. In other words copy what the > ohci-sm501.c file is doing. I just wanted to confirm that this is > what I should be doing or is there a better generic way of telling the > OHCI driver to use this 8KB shared memory. There isn't a generic way of doing it, but you could such a thing to the ohci-platform driver. That would be preferable to adding a new, separate platform driver. 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
