drm/amd/display: implement DXGI Gamma Ramps

Support for gamma correction ramp in Floating Point format

Signed-off-by: Anthony Koo <anthony.koo@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -1874,15 +1874,14 @@ static int fill_plane_attributes_from_fb(
 
 }
 
-#define NUM_OF_RAW_GAMMA_RAMP_RGB_256 256
-
 static void fill_gamma_from_crtc_state(
 	const struct drm_crtc_state *crtc_state,
 	struct dc_plane_state *plane_state)
 {
 	int i;
 	struct dc_gamma *gamma;
-	struct drm_color_lut *lut = (struct drm_color_lut *) crtc_state->gamma_lut->data;
+	struct drm_color_lut *lut =
+			(struct drm_color_lut *) crtc_state->gamma_lut->data;
 
 	gamma = dc_create_gamma();
 
@@ -1891,10 +1890,11 @@ static void fill_gamma_from_crtc_state(
 		return;
 	}
 
-	for (i = 0; i < NUM_OF_RAW_GAMMA_RAMP_RGB_256; i++) {
-		gamma->red[i] = lut[i].red;
-		gamma->green[i] = lut[i].green;
-		gamma->blue[i] = lut[i].blue;
+	gamma->type = GAMMA_RGB_256_ENTRIES;
+	for (i = 0; i < GAMMA_RGB_256_ENTRIES; i++) {
+		gamma->entries.red[i] = dal_fixed31_32_from_int(lut[i].red);
+		gamma->entries.green[i] = dal_fixed31_32_from_int(lut[i].green);
+		gamma->entries.blue[i] = dal_fixed31_32_from_int(lut[i].blue);
 	}
 
 	plane_state->gamma_correction = gamma;

drivers/gpu/drm/amd/display/dc/dc_hw_types.h

@@ -409,20 +409,31 @@ struct dc_cursor_mi_param {
 /* IPP related types */
 
 enum {
-	INPUT_LUT_ENTRIES = 256
+	GAMMA_RGB_256_ENTRIES = 256,
+	GAMMA_RGB_FLOAT_1024_ENTRIES = 1024,
+	GAMMA_MAX_ENTRIES = 1024
+};
+
+enum dc_gamma_type {
+	GAMMA_RGB_256 = 1,
+	GAMMA_RGB_FLOAT_1024 = 2
 };
 
 struct dc_gamma {
-	uint16_t red[INPUT_LUT_ENTRIES];
-	uint16_t green[INPUT_LUT_ENTRIES];
-	uint16_t blue[INPUT_LUT_ENTRIES];
+	enum dc_gamma_type type;
+	unsigned int num_entries;
+
+	struct dc_gamma_entries {
+		struct fixed31_32 red[GAMMA_MAX_ENTRIES];
+		struct fixed31_32 green[GAMMA_MAX_ENTRIES];
+		struct fixed31_32 blue[GAMMA_MAX_ENTRIES];
+	} entries;
 
 	/* private to DC core */
 	struct dc_context *ctx;
 
 	/* private to dc_surface.c */
 	int ref_count;
-
 };
 
 /* Used by both ipp amd opp functions*/

drivers/gpu/drm/amd/display/dc/dce/dce_ipp.c

@@ -193,10 +193,16 @@ static void dce_ipp_program_input_lut(
 	REG_SET(DC_LUT_RW_INDEX, 0,
 		DC_LUT_RW_INDEX, 0);
 
-	for (i = 0; i < INPUT_LUT_ENTRIES; i++) {
-		REG_SET(DC_LUT_SEQ_COLOR, 0, DC_LUT_SEQ_COLOR, gamma->red[i]);
-		REG_SET(DC_LUT_SEQ_COLOR, 0, DC_LUT_SEQ_COLOR, gamma->green[i]);
-		REG_SET(DC_LUT_SEQ_COLOR, 0, DC_LUT_SEQ_COLOR, gamma->blue[i]);
+	for (i = 0; i < gamma->num_entries; i++) {
+		REG_SET(DC_LUT_SEQ_COLOR, 0, DC_LUT_SEQ_COLOR,
+				dal_fixed31_32_round(
+					gamma->entries.red[i]));
+		REG_SET(DC_LUT_SEQ_COLOR, 0, DC_LUT_SEQ_COLOR,
+				dal_fixed31_32_round(
+					gamma->entries.green[i]));
+		REG_SET(DC_LUT_SEQ_COLOR, 0, DC_LUT_SEQ_COLOR,
+				dal_fixed31_32_round(
+					gamma->entries.blue[i]));
 	}
 
 	/* power off LUT memory */

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_ipp.c

@@ -910,13 +910,16 @@ static void ippn10_program_input_lut(
 		CM_IGAM_LUT_FORMAT_B, 3);
 	// Start at index 0 of IGAM LUT
 	REG_UPDATE(CM_IGAM_LUT_RW_INDEX, CM_IGAM_LUT_RW_INDEX, 0);
-	for (i = 0; i < INPUT_LUT_ENTRIES; i++) {
+	for (i = 0; i < gamma->num_entries; i++) {
 		REG_SET(CM_IGAM_LUT_SEQ_COLOR, 0, CM_IGAM_LUT_SEQ_COLOR,
-					gamma->red[i]);
+				dal_fixed31_32_round(
+					gamma->entries.red[i]));
 		REG_SET(CM_IGAM_LUT_SEQ_COLOR, 0, CM_IGAM_LUT_SEQ_COLOR,
-					gamma->green[i]);
+				dal_fixed31_32_round(
+					gamma->entries.green[i]));
 		REG_SET(CM_IGAM_LUT_SEQ_COLOR, 0, CM_IGAM_LUT_SEQ_COLOR,
-					gamma->blue[i]);
+				dal_fixed31_32_round(
+					gamma->entries.blue[i]));
 	}
 	// Power off LUT memory
 	REG_SET(CM_MEM_PWR_CTRL, 0, SHARED_MEM_PWR_DIS, 0);