(In reply to comment #76)
> this should be:
> 
> +        for (i = 0; i < rdev->config.cik.max_texture_channel_caches; i++)
> +                cgts_tcc_disable &= ~(1 << (16 + i));

Why? This is si_gpu_init().

(In reply to comment #75)
> Created attachment 98258 [details] [review] [review]
> Tahiti Fix
[...]
>+        WREG32(CGTS_TCC_DISABLE, cgts_tcc_disable);

My understanding is that this register indicates which TCCs are not functional.
So this line should be replaced by

        cgts_tcc_disable |= RREG32(CGTS_TCC_DISABLE);