Enabling sample_c optimization for Broadwell GPUs

Hi there,

While browsing an old downstream kernel, I found a patch[0] that enables sample_c optimizations at Broadwell GPUs. The message from the upstream commit that enables it for Haswell[1] (and presumably where the code at[0] was copied from) states that "[..] later platforms remove this bit, and apparently always enable the optimization".

Could you confirm that Broadwell and following architectures enable this optimization by default (and thus, patch[0] is a no-op), or should I upstream it?

Thanks, André

[0] https://github.com/ValveSoftware/steamos_kernel/commit/198990f13e1d9429864c1...

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...