drm/i915: Drop the pointless linear legacy LUT load on CHV

We now bypass the legacy LUT when it's not needed, so
no point in filling it up with a linear LUT.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190327155045.28446-10-ville.syrjala@linux.intel.com

drivers/gpu/drm/i915/intel_color.c

@@ -376,15 +376,6 @@ static void i9xx_load_luts_internal(const struct intel_crtc_state *crtc_state,
 				(drm_color_lut_extract(lut[i].green, 8) << 8) |
 				drm_color_lut_extract(lut[i].blue, 8);
 
-			if (HAS_GMCH(dev_priv))
-				I915_WRITE(PALETTE(pipe, i), word);
-			else
-				I915_WRITE(LGC_PALETTE(pipe, i), word);
-		}
-	} else {
-		for (i = 0; i < 256; i++) {
-			u32 word = (i << 16) | (i << 8) | i;
-
 			if (HAS_GMCH(dev_priv))
 				I915_WRITE(PALETTE(pipe, i), word);
 			else
@@ -643,7 +634,7 @@ static void cherryview_load_luts(const struct intel_crtc_state *crtc_state)
 	cherryview_load_csc_matrix(crtc_state);
 
 	if (crtc_state_is_legacy_gamma(crtc_state)) {
-		i9xx_load_luts_internal(crtc_state, gamma_lut);
+		i9xx_load_luts(crtc_state);
 		return;
 	}
 
@@ -682,12 +673,6 @@ static void cherryview_load_luts(const struct intel_crtc_state *crtc_state)
 			I915_WRITE(CGM_PIPE_GAMMA(pipe, i, 1), word1);
 		}
 	}
-
-	/*
-	 * Also program a linear LUT in the legacy block (behind the
-	 * CGM block).
-	 */
-	i9xx_load_luts_internal(crtc_state, NULL);
 }
 
 void intel_color_load_luts(const struct intel_crtc_state *crtc_state)