drm/i915: Store ilk+ csc matrices in the crtc state

Embed a pair of intel_csc_matrix structs in the crtc state,
and fill them out appropriately during atomic_check().

Since pre-ivb platforms don't have programmable post offsets
we shall leave those zeroed, mainly in preparation for
state readout+check.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230329135002.3096-6-ville.syrjala@linux.intel.comReviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>

drivers/gpu/drm/i915/display/intel_color.c

@@ -158,6 +158,11 @@ static const struct intel_csc_matrix ilk_csc_matrix_rgb_to_ycbcr = {
 	},
 };
 
+static void intel_csc_clear(struct intel_csc_matrix *csc)
+{
+	memset(csc, 0, sizeof(*csc));
+}
+
 static bool lut_is_legacy(const struct drm_property_blob *lut)
 {
 	return lut && drm_color_lut_size(lut) == LEGACY_LUT_LENGTH;
@@ -292,10 +297,21 @@ static bool ilk_csc_limited_range(const struct intel_crtc_state *crtc_state)
 	return !ilk_lut_limited_range(crtc_state);
 }
 
+static void ilk_csc_copy(struct drm_i915_private *i915,
+			 struct intel_csc_matrix *dst,
+			 const struct intel_csc_matrix *src)
+{
+	*dst = *src;
+
+	if (DISPLAY_VER(i915) < 7)
+		memset(dst->postoff, 0, sizeof(dst->postoff));
+}
+
 static void ilk_csc_convert_ctm(const struct intel_crtc_state *crtc_state,
 				struct intel_csc_matrix *csc,
 				bool limited_color_range)
 {
+	struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
 	const struct drm_color_ctm *ctm = crtc_state->hw.ctm->data;
 	const u64 *input;
 	u64 temp[9];
@@ -303,9 +319,9 @@ static void ilk_csc_convert_ctm(const struct intel_crtc_state *crtc_state,
 
 	/* for preoff/postoff */
 	if (limited_color_range)
-		*csc = ilk_csc_matrix_limited_range;
+		ilk_csc_copy(i915, csc, &ilk_csc_matrix_limited_range);
 	else
-		*csc = ilk_csc_matrix_identity;
+		ilk_csc_copy(i915, csc, &ilk_csc_matrix_identity);
 
 	if (limited_color_range)
 		input = ctm_mult_by_limited(temp, ctm->matrix);
@@ -351,22 +367,17 @@ static void ilk_csc_convert_ctm(const struct intel_crtc_state *crtc_state,
 	}
 }
 
-static void ilk_load_csc_matrix(const struct intel_crtc_state *crtc_state)
+static void ilk_assign_csc(struct intel_crtc_state *crtc_state)
 {
-	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
-	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+	struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
 	bool limited_color_range = ilk_csc_limited_range(crtc_state);
 
 	if (crtc_state->hw.ctm) {
-		struct intel_csc_matrix tmp;
-
-		ilk_csc_convert_ctm(crtc_state, &tmp, limited_color_range);
-
-		ilk_update_pipe_csc(crtc, &tmp);
+		ilk_csc_convert_ctm(crtc_state, &crtc_state->csc, limited_color_range);
 	} else if (crtc_state->output_format != INTEL_OUTPUT_FORMAT_RGB) {
-		ilk_update_pipe_csc(crtc, &ilk_csc_matrix_rgb_to_ycbcr);
+		ilk_csc_copy(i915, &crtc_state->csc, &ilk_csc_matrix_rgb_to_ycbcr);
 	} else if (limited_color_range) {
-		ilk_update_pipe_csc(crtc, &ilk_csc_matrix_limited_range);
+		ilk_csc_copy(i915, &crtc_state->csc, &ilk_csc_matrix_limited_range);
 	} else if (crtc_state->csc_enable) {
 		/*
 		 * On GLK both pipe CSC and degamma LUT are controlled
@@ -376,27 +387,46 @@ static void ilk_load_csc_matrix(const struct intel_crtc_state *crtc_state)
 		 */
 		drm_WARN_ON(&i915->drm, !IS_GEMINILAKE(i915));
 
-		ilk_update_pipe_csc(crtc, &ilk_csc_matrix_identity);
+		ilk_csc_copy(i915, &crtc_state->csc, &ilk_csc_matrix_identity);
+	} else {
+		intel_csc_clear(&crtc_state->csc);
 	}
 }
 
-static void icl_load_csc_matrix(const struct intel_crtc_state *crtc_state)
+static void ilk_load_csc_matrix(const struct intel_crtc_state *crtc_state)
 {
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
 
-	if (crtc_state->hw.ctm) {
-		struct intel_csc_matrix tmp;
+	if (crtc_state->csc_enable)
+		ilk_update_pipe_csc(crtc, &crtc_state->csc);
+}
 
-		ilk_csc_convert_ctm(crtc_state, &tmp, false);
+static void icl_assign_csc(struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
 
-		ilk_update_pipe_csc(crtc, &tmp);
-	}
+	if (crtc_state->hw.ctm)
+		ilk_csc_convert_ctm(crtc_state, &crtc_state->csc, false);
+	else
+		intel_csc_clear(&crtc_state->csc);
 
-	if (crtc_state->output_format != INTEL_OUTPUT_FORMAT_RGB) {
-		icl_update_output_csc(crtc, &ilk_csc_matrix_rgb_to_ycbcr);
-	} else if (crtc_state->limited_color_range) {
-		icl_update_output_csc(crtc, &ilk_csc_matrix_limited_range);
-	}
+	if (crtc_state->output_format != INTEL_OUTPUT_FORMAT_RGB)
+		ilk_csc_copy(i915, &crtc_state->output_csc, &ilk_csc_matrix_rgb_to_ycbcr);
+	else if (crtc_state->limited_color_range)
+		ilk_csc_copy(i915, &crtc_state->output_csc, &ilk_csc_matrix_limited_range);
+	else
+		intel_csc_clear(&crtc_state->output_csc);
+}
+
+static void icl_load_csc_matrix(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+
+	if (crtc_state->csc_mode & ICL_CSC_ENABLE)
+		ilk_update_pipe_csc(crtc, &crtc_state->csc);
+
+	if (crtc_state->csc_mode & ICL_OUTPUT_CSC_ENABLE)
+		icl_update_output_csc(crtc, &crtc_state->output_csc);
 }
 
 static void chv_cgm_csc_convert_ctm(struct intel_csc_matrix *csc,
@@ -1962,6 +1992,8 @@ static int ilk_color_check(struct intel_crtc_state *crtc_state)
 	if (ret)
 		return ret;
 
+	ilk_assign_csc(crtc_state);
+
 	crtc_state->preload_luts = intel_can_preload_luts(crtc_state);
 
 	return 0;
@@ -2068,6 +2100,8 @@ static int ivb_color_check(struct intel_crtc_state *crtc_state)
 	if (ret)
 		return ret;
 
+	ilk_assign_csc(crtc_state);
+
 	crtc_state->preload_luts = intel_can_preload_luts(crtc_state);
 
 	return 0;
@@ -2199,6 +2233,8 @@ static int glk_color_check(struct intel_crtc_state *crtc_state)
 	if (ret)
 		return ret;
 
+	ilk_assign_csc(crtc_state);
+
 	crtc_state->preload_luts = intel_can_preload_luts(crtc_state);
 
 	return 0;
@@ -2261,6 +2297,8 @@ static int icl_color_check(struct intel_crtc_state *crtc_state)
 
 	intel_assign_luts(crtc_state);
 
+	icl_assign_csc(crtc_state);
+
 	crtc_state->preload_luts = intel_can_preload_luts(crtc_state);
 
 	return 0;

drivers/gpu/drm/i915/display/intel_display_types.h

@@ -1027,6 +1027,8 @@ struct intel_crtc_state {
 	/* actual state of LUTs */
 	struct drm_property_blob *pre_csc_lut, *post_csc_lut;
 
+	struct intel_csc_matrix csc, output_csc;
+
 	/**
 	 * quirks - bitfield with hw state readout quirks
 	 *