[RFC 29/33] drm/i915/xelpd: Program Plane Post CSC Registers

[Uma Shankar]

Extract the LUT and program plane post csc registers.

Co-developed-by: Chaitanya Kumar Borah <chaitanya.kumar.borah at intel.com>
Signed-off-by: Chaitanya Kumar Borah <chaitanya.kumar.borah at intel.com>
Signed-off-by: Uma Shankar <uma.shankar at intel.com>
---
 drivers/gpu/drm/i915/display/intel_color.c | 95 +++++++++++++++++++++-
 1 file changed, 94 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_color.c b/drivers/gpu/drm/i915/display/intel_color.c
index 56bcf750b047..ff996b9ee77d 100644
--- a/drivers/gpu/drm/i915/display/intel_color.c
+++ b/drivers/gpu/drm/i915/display/intel_color.c
@@ -1963,16 +1963,109 @@ static void xelpd_program_plane_pre_csc_lut(const struct drm_plane_state *state,
 	}
 }
 
+static void xelpd_program_plane_post_csc_lut(const struct drm_plane_state *state,
+					     struct drm_color_lut_ext *post_csc_lut,
+					     u32 offset)
+{
+	struct drm_i915_private *dev_priv = to_i915(state->plane->dev);
+	enum pipe pipe = to_intel_plane(state->plane)->pipe;
+	enum plane_id plane = to_intel_plane(state->plane)->id;
+	u32 i, lut_size;
+
+	if (icl_is_hdr_plane(dev_priv, plane)) {
+		intel_de_write_fw(dev_priv, PLANE_POST_CSC_GAMC_INDEX_ENH(pipe, plane, 0),
+				  offset | PLANE_PAL_PREC_AUTO_INCREMENT);
+		if (post_csc_lut) {
+			lut_size = 32;
+			for (i = 0; i < lut_size; i++) {
+				u64 word = drm_color_lut_extract_ext(post_csc_lut[i].green, 24);
+				u32 lut_val = (word & 0xffffff);
+
+				intel_de_write_fw(dev_priv,
+						  PLANE_POST_CSC_GAMC_DATA_ENH(pipe, plane, 0),
+						  lut_val);
+			}
+
+			do {
+				/* Program the max register to clamp values > 1.0. */
+				intel_de_write_fw(dev_priv,
+						  PLANE_POST_CSC_GAMC_DATA_ENH(pipe, plane, 0),
+						  post_csc_lut[i].green);
+			} while (i++ < 34);
+		} else {
+			lut_size = 32;
+			for (i = 0; i < lut_size; i++) {
+				u32 v = (i * ((1 << 24) - 1)) / (lut_size - 1);
+
+				intel_de_write_fw(dev_priv,
+						  PLANE_POST_CSC_GAMC_DATA_ENH(pipe, plane, 0), v);
+			}
+
+			do {
+				intel_de_write_fw(dev_priv,
+						  PLANE_POST_CSC_GAMC_DATA_ENH(pipe, plane, 0),
+						  1 << 24);
+			} while (i++ < 34);
+		}
+
+		intel_de_write_fw(dev_priv, PLANE_POST_CSC_GAMC_INDEX_ENH(pipe, plane, 0), 0);
+	} else {
+		lut_size = 32;
+		/*
+		 * First 3 planes are HDR, so reduce by 3 to get to the right
+		 * SDR plane offset
+		 */
+		plane = plane - 3;
+
+		intel_de_write_fw(dev_priv, PLANE_POST_CSC_GAMC_INDEX(pipe, plane, 0),
+				  offset | PLANE_PAL_PREC_AUTO_INCREMENT);
+
+		if (post_csc_lut) {
+			for (i = 0; i < lut_size; i++)
+				intel_de_write_fw(dev_priv,
+						  PLANE_POST_CSC_GAMC_DATA(pipe, plane, 0),
+						  post_csc_lut[i].green & 0xffff);
+			/* Program the max register to clamp values > 1.0. */
+			while (i < 35)
+				intel_de_write_fw(dev_priv,
+						  PLANE_POST_CSC_GAMC_DATA(pipe, plane, 0),
+						  post_csc_lut[i++].green & 0x3ffff);
+		} else {
+			for (i = 0; i < lut_size; i++) {
+				u32 v = (i * ((1 << 16) - 1)) / (lut_size - 1);
+
+				intel_de_write_fw(dev_priv,
+						  PLANE_POST_CSC_GAMC_DATA(pipe, plane, 0), v);
+			}
+
+			do {
+				intel_de_write_fw(dev_priv,
+						  PLANE_POST_CSC_GAMC_DATA(pipe, plane, 0),
+						  (1 << 16));
+			} while (i++ < 34);
+		}
+
+		intel_de_write_fw(dev_priv, PLANE_POST_CSC_GAMC_INDEX(pipe, plane, 0), 0);
+	}
+}
+
 static void xelpd_plane_load_luts(const struct drm_plane_state *plane_state)
 {
 	const struct drm_property_blob *pre_csc_lut_blob =
 					plane_state->color.pre_csc_lut;
-	struct drm_color_lut_ext *pre_csc_lut = NULL;
+	const struct drm_property_blob *post_csc_lut_blob =
+					plane_state->color.post_csc_lut;
+	struct drm_color_lut_ext *pre_csc_lut, *post_csc_lut;
 
 	if (pre_csc_lut_blob) {
 		pre_csc_lut = pre_csc_lut_blob->data;
 		xelpd_program_plane_pre_csc_lut(plane_state, pre_csc_lut, 0);
 	}
+
+	if (post_csc_lut_blob) {
+		post_csc_lut = post_csc_lut_blob->data;
+		xelpd_program_plane_post_csc_lut(plane_state, post_csc_lut, 0);
+	}
 }
 
 void intel_color_load_luts(const struct intel_crtc_state *crtc_state)
-- 
2.38.1