[Intel-gfx] [PATCH v2 2/3] drm/i915: Document our lackluster FSB frequency readout

[Chris Wilson]

Quoting Ville Syrjala (2020-05-14 13:38:37)
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> Document the fact that we aren't reading out the actual FSB
> frequency but rather just the state of the FSB straps.
> Some BIOSen allow you to configure the two independently.
> So if someone sets the two up in an inconsistent manner
> we'll get the wrong answer here and thus will end up with
> incorrect aux/pps clock dividers. Alas, proper docs are no
> longer around so we can't do any better.
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris