https://bugzilla.kernel.org/show_bug.cgi?id=80331

--- Comment #5 from Colin colin.bruce@ctalk.co.uk --- (In reply to Alex Deucher from comment #4)

If the driver is built into the kernel, you need to built the firmware into the kernel as well.

I am just using the standard build system e.g. make bzImage. As I said if I remove the patch I mentioned in the original post everything works fine. If the patch is applied it doesn't work. I don't know if that has anything to do with building the firmware.