crtc_state->csc_mode);
 }
 
+static u32 hsw_read_gamma_mode(struct intel_crtc *crtc)
+{
+       struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+
+       return intel_de_read(i915, GAMMA_MODE(crtc->pipe));
+}
+
+static void hsw_get_config(struct intel_crtc_state *crtc_state)
+{
+       struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+
+       crtc_state->gamma_mode = hsw_read_gamma_mode(crtc);
+}
+
 static void skl_color_commit_arm(const struct intel_crtc_state *crtc_state)
 {
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        .read_luts = icl_read_luts,
        .lut_equal = icl_lut_equal,
        .read_csc = icl_read_csc,
+       .get_config = hsw_get_config,
 };
 
 static const struct intel_color_funcs icl_color_funcs = {
        .read_luts = icl_read_luts,
        .lut_equal = icl_lut_equal,
        .read_csc = icl_read_csc,
+       .get_config = hsw_get_config,
 };
 
 static const struct intel_color_funcs glk_color_funcs = {
        .read_luts = glk_read_luts,
        .lut_equal = glk_lut_equal,
        .read_csc = skl_read_csc,
+       .get_config = hsw_get_config,
 };
 
 static const struct intel_color_funcs skl_color_funcs = {
        .read_luts = bdw_read_luts,
        .lut_equal = ivb_lut_equal,
        .read_csc = skl_read_csc,
+       .get_config = hsw_get_config,
 };
 
 static const struct intel_color_funcs bdw_color_funcs = {
        .read_luts = bdw_read_luts,
        .lut_equal = ivb_lut_equal,
        .read_csc = ilk_read_csc,
+       .get_config = hsw_get_config,
 };
 
 static const struct intel_color_funcs hsw_color_funcs = {
        .read_luts = ivb_read_luts,
        .lut_equal = ivb_lut_equal,
        .read_csc = ilk_read_csc,
+       .get_config = hsw_get_config,
 };
 
 static const struct intel_color_funcs ivb_color_funcs = {