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authorVille Syrjälä <ville.syrjala@linux.intel.com>2016-03-04 21:43:02 +0200
committerVille Syrjälä <ville.syrjala@linux.intel.com>2016-04-05 21:17:39 +0300
commitc30fec656d1336a453bd4cb769a7c5e5c577e3b1 (patch)
tree620dade5052172ee1fdd68d8b9324bd098cd8896 /fs
parentd761701c55a99598477f3cb25c03d939a7711e74 (diff)
drm/i915: Use GPLL ref clock to calculate GPU freqs on VLV/CHV
Extract the GPLL reference frequency from CCK and use it in the GPU freq<->opcode conversions on VLV/CHV. This eliminates all the assumptions we have about which divider is used for which czclk frequency. Note that unlike most clocks from CCK, the GPLL ref clock is a divided down version of the CZ clock rather than the HPLL clock. CZ clock itself is a divided down version of the HPLL clock though, so in effect it just gets divided down twice. While at it, throw in a few comments explaining the remaining constants for anyone who later wants to compare this to the spreadsheets. v2: Add slow/fast notes for CHV clocks (Imre) Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1457120584-26080-2-git-send-email-ville.syrjala@linux.intel.com Reviewed-by: Imre Deak <imre.deak@intel.com> (v1)
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