• Lyude Paul's avatar
    drm/nouveau: Add support for BLCG on Kepler1 · 1bab09ac
    Lyude Paul authored
    This enables BLCG optimization for kepler1. When using clockgating,
    nvidia's firmware has a set of registers which are initially programmed
    by the vbios with various engine delays and other mysterious settings
    that are safe enough to bring up the GPU. However, the values used by
    the vbios are more power hungry then they need to be, so the nvidia driver
    writes it's own more optimized set of BLCG settings before enabling
    CG_CTRL. This adds support for programming the optimized BLCG values
    during engine/subdev init, which enables rather significant power
    savings.
    
    This introduces the nvkm_therm_clkgate_init() helper, which we use to
    program the optimized BLCG settings before enabling clockgating with
    nvkm_therm_clkgate_enable.
    
    As well, this commit shares a lot more code with Fermi since BLCG is
    mostly the same there as far as we can tell. In the future, it's likely
    we'll reformat the clkgate_packs for kepler1 so that they share a list
    of mmio packs with Fermi.
    Signed-off-by: default avatarLyude Paul <lyude@redhat.com>
    Reviewed-by: default avatarMartin Peres <martin.peres@free.fr>
    Signed-off-by: default avatarBen Skeggs <bskeggs@redhat.com>
    1bab09ac
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