Consider enabling SmallPL on Icelake
https://gitlab.freedesktop.org/kwg/mesa/-/commits/smallpl has code to enable the "Small PL" feature on Icelake, which is a lower power sampler block that kicks in to handle simple cases. It needs the "low quality LOD" mode, which I believe just does unorm math instead of float in some cases, and it doesn't regress anything in CI.
Someone should determine whether this is useful, add benchmarking data, tidy it up, and land it. Said person would also need to write a kernel patch to whitelist the register too. I believe this feature only exists on Icelake.