[PATCH 21/23] drm/i915/xelpd: Program Plane Post CSC Registers

[Chaitanya Kumar Borah]

Extract the LUT and program plane post csc registers.

Signed-off-by: Uma Shankar <uma.shankar at intel.com>
Signed-off-by: Chaitanya Kumar Borah <chaitanya.kumar.borah at intel.com>
---
 drivers/gpu/drm/i915/display/intel_color.c | 110 +++++++++++++++++++++
 1 file changed, 110 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_color.c b/drivers/gpu/drm/i915/display/intel_color.c
index 68aab86d3f95..9512e3410673 100644
--- a/drivers/gpu/drm/i915/display/intel_color.c
+++ b/drivers/gpu/drm/i915/display/intel_color.c
@@ -4006,10 +4006,120 @@ static void xelpd_program_plane_pre_csc_lut(const struct intel_plane_state *plan
 	}
 }
 
+static void xelpd_program_plane_post_csc_lut(const struct intel_plane_state *plane_state)
+{
+	struct intel_display *display = to_intel_display(plane_state);
+	const struct drm_plane_state *state = &plane_state->uapi;
+	enum pipe pipe = to_intel_plane(state->plane)->pipe;
+	enum plane_id plane = to_intel_plane(state->plane)->id;
+	const struct drm_color_lut_32 *post_csc_lut = plane_state->hw.gamma_lut->data;
+	u32 i, lut_size, j;
+
+	if (icl_is_hdr_plane(display, plane)) {
+		intel_de_write_fw(display, PLANE_POST_CSC_GAMC_INDEX_ENH(pipe, plane, 0),
+				  PLANE_PAL_PREC_AUTO_INCREMENT);
+		/* TODO: Add macro */
+		intel_de_write_fw(display, PLANE_POST_CSC_GAMC_SEG0_INDEX_ENH(pipe, plane, 0),
+				  PLANE_PAL_PREC_AUTO_INCREMENT);
+		if (post_csc_lut) {
+			/* Segment 0 */
+			for (i = 0, j = 0; i < 9; i++, j++) {
+				u32 lut_val = (post_csc_lut[j].green & 0xffffff);
+
+				intel_de_write_fw(display,
+						  PLANE_POST_CSC_GAMC_SEG0_DATA_ENH(pipe, plane, 0),
+						  lut_val);
+			}
+
+			/* Segment 1 */
+			lut_size = 32;
+			for (i = 0; i < lut_size; i++) {
+				u32 lut_val;
+
+				if (i == 0)
+					lut_val = post_csc_lut[0].green & 0xffffff;
+				else if (i == 1)
+					lut_val = (post_csc_lut[8].green & 0xffffff);
+				else
+					lut_val = (post_csc_lut[j++].green & 0xffffff);
+
+				intel_de_write_fw(display,
+						  PLANE_POST_CSC_GAMC_DATA_ENH(pipe, plane, 0),
+						  lut_val);
+			}
+
+			/* Segment 2 */
+			do {
+				intel_de_write_fw(display,
+						  PLANE_POST_CSC_GAMC_DATA_ENH(pipe, plane, 0),
+						  post_csc_lut[j++].green);
+			} while (j < 42);
+		} else {
+			/*TODO: Add for segment 0 */
+			lut_size = 32;
+			for (i = 0; i < lut_size; i++) {
+				u32 v = (i * ((1 << 24) - 1)) / (lut_size - 1);
+
+				intel_de_write_fw(display,
+						  PLANE_POST_CSC_GAMC_DATA_ENH(pipe, plane, 0), v);
+			}
+
+			do {
+				intel_de_write_fw(display,
+						  PLANE_POST_CSC_GAMC_DATA_ENH(pipe, plane, 0),
+						  1 << 24);
+			} while (i++ < 34);
+		}
+
+		intel_de_write_fw(display, PLANE_POST_CSC_GAMC_INDEX_ENH(pipe, plane, 0), 0);
+		intel_de_write_fw(display, PLANE_POST_CSC_GAMC_SEG0_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(display, PLANE_POST_CSC_GAMC_INDEX(pipe, plane, 0),
+				  PLANE_PAL_PREC_AUTO_INCREMENT);
+
+		if (post_csc_lut) {
+			for (i = 0; i < lut_size; i++)
+				intel_de_write_fw(display,
+						  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(display,
+						  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(display,
+						  PLANE_POST_CSC_GAMC_DATA(pipe, plane, 0), v);
+			}
+
+			do {
+				intel_de_write_fw(display,
+						  PLANE_POST_CSC_GAMC_DATA(pipe, plane, 0),
+						  (1 << 16));
+			} while (i++ < 34);
+		}
+
+		intel_de_write_fw(display, PLANE_POST_CSC_GAMC_INDEX(pipe, plane, 0), 0);
+	}
+}
+
 static void xelpd_plane_load_luts(const struct intel_plane_state *plane_state)
 {
 	if (plane_state->hw.degamma_lut)
 		xelpd_program_plane_pre_csc_lut(plane_state);
+
+	if (plane_state->hw.gamma_lut)
+		xelpd_program_plane_post_csc_lut(plane_state);
 }
 
 static const struct intel_color_funcs chv_color_funcs = {
-- 
2.25.1