SPU not working for kernel 4.9, 4.10, 4.11a and 4.12

[Michael Ellerman]

Jeremy Kerr <jk at ozlabs.org> writes:

> Hi all,
>
>
>> Looks like this also happens with the simple spu_run test:
>> 
>>  https://github.com/jk-ozlabs/spufs-testsuite/blob/master/tests/03-spu_run/01-spu_run.c
>> 
>> ... might need some debugging here, I'll update if I find anything.
>
> And it appears we're stuck in the POLL_WHILE_FALSE() loop in
> wait_tag_complete() called from restore_lscsa().
>
> Because spufs itself has been fairly static, I suspect some other change
> has meant that MFC DMAs aren't working; so at this point, a bisect might
> be the best way forward. Do you see the exact same behaviour on 4.9 (but
> 4.8 works?)

I can bisect it here, I have everything setup to autoboot etc.

cheers