drm/nouveau: Add support for basic clockgating on Kepler1
This adds support for enabling automatic clockgating on nvidia GPUs for Kepler1. While this is not technically a clockgating level, it does enable clockgating using the clockgating values initially set by the vbios (which should be safe to use). This introduces two therm helpers for controlling basic clockgating: nvkm_therm_clkgate_enable() - enables clockgating through CG_CTRL, done after initializing the GPU fully nvkm_therm_clkgate_fini() - prepares clockgating for suspend or driver unload A lot of this code was originally going to be based off of fermi; however it turns out that while Fermi's the first line of GPUs that introduced this kind of power saving, Fermi requires more fine tuned control of the CG_CTRL registers from the driver while reclocking that we don't entirely understand yet. For the simple parts we will be sharing with Fermi for certain however, we at least add those into a new subdev/therm/gf100.h header. Signed-off-by:Lyude Paul <lyude@redhat.com> Reviewed-by:
Martin Peres <martin.peres@free.fr> Signed-off-by:
Ben Skeggs <bskeggs@redhat.com>
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