drm/nouveau/fan: rewrite the fan tachometer driver to get more precision, faster
The previous driver waited for 250ms to accumulate data. This version times a complete fan rotation and extrapolates to RPM. The fan rotational speed should now be read in less than 250ms (worst case) and usually in less 50ms. Signed-off-by: NMartin Peres <martin.peres@labri.fr> Reviewed-by: NBen Skeggs <bskeggs@redhat.com> Signed-off-by: NBen Skeggs <bskeggs@redhat.com>
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