drm/i915/color: Extract icl_read_luts()
For icl+, have hw read out to create hw blob of gamma lut values. icl+ platforms supports multi segmented gamma mode by default, add hw lut creation for this mode. This will be used to validate gamma programming using dsb (display state buffer) which is a tgl specific feature. v2: -readout code for multisegmented gamma has to come up with some intermediate entries that aren't preserved in hardware (Jani N) -linear interpolation (Ville) -moved common code to check gamma_enable to specific funcs, since icl doesn't support that v3: -use u16 instead of __u16 [Jani N] -used single lut [Jani N] -improved and more readable for loops [Jani N] -read values directly to actual locations and then fill gaps [Jani N] -moved cleaning to patch 1 [Jani N] -renamed icl_read_lut_multi_seg() to icl_read_lut_multi_segment to make it similar to icl_load_luts() -renamed icl_compute_interpolated_gamma_blob() to icl_compute_interpolated_gamma_lut_values() more sensible, I guess v4: -removed interpolated func for creating gamma lut values -removed readouts of fine and coarse segments, failure to read PAL_PREC_DATA correctly v5: -added gamma_enable check inside read_luts() v6: -renamed intel_color_lut_entry_equal() to intel_color_lut_entries_equal() [Ville] -changed if-else to switch [Ville] -removed intel_color_lut_entry_multi_equal() [Ville] v7: -checkpatch warnings v8: -rebased v9: -rebased, aligned with Ville's style of gamma cleanup Signed-off-by:Swati Sharma <swati2.sharma@intel.com> Reviewed-by:
Mika Kahola <mika.kahola@intel.com> Signed-off-by:
Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200317135736.14305-1-swati2.sharma@intel.com
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