drm/amd/display: Use DGAM ROM or RAM

[Why]
Optimize gamma programming

[How]
Use ROM for optimization when it is possible.
Use RAM only when it is necessary.
Signed-off-by: Vitaly Prosyak <vitaly.prosyak@amd.com>
Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -22,7 +22,7 @@
  * Authors: AMD
  *
  */
-
+#include "amdgpu.h"
 #include "amdgpu_mode.h"
 #include "amdgpu_dm.h"
 #include "dc.h"
@@ -122,6 +122,8 @@ int amdgpu_dm_set_regamma_lut(struct dm_crtc_state *crtc)
 {
 	struct drm_property_blob *blob = crtc->base.gamma_lut;
 	struct dc_stream_state *stream = crtc->stream;
+	struct amdgpu_device *adev = (struct amdgpu_device *)
+		crtc->base.state->dev->dev_private;
 	struct drm_color_lut *lut;
 	uint32_t lut_size;
 	struct dc_gamma *gamma;
@@ -162,7 +164,7 @@ int amdgpu_dm_set_regamma_lut(struct dm_crtc_state *crtc)
 	 */
 	stream->out_transfer_func->type = TF_TYPE_DISTRIBUTED_POINTS;
 	ret = mod_color_calculate_regamma_params(stream->out_transfer_func,
-						 gamma, true);
+						 gamma, true, adev->asic_type <= CHIP_RAVEN);
 	dc_gamma_release(&gamma);
 	if (!ret) {
 		stream->out_transfer_func->type = old_type;

drivers/gpu/drm/amd/display/modules/color/color_gamma.c

@@ -1352,7 +1352,7 @@ static bool map_regamma_hw_to_x_user(
 #define _EXTRA_POINTS 3
 
 bool mod_color_calculate_regamma_params(struct dc_transfer_func *output_tf,
-		const struct dc_gamma *ramp, bool mapUserRamp)
+		const struct dc_gamma *ramp, bool mapUserRamp, bool canRomBeUsed)
 {
 	struct dc_transfer_func_distributed_points *tf_pts = &output_tf->tf_pts;
 	struct dividers dividers;
@@ -1368,7 +1368,7 @@ bool mod_color_calculate_regamma_params(struct dc_transfer_func *output_tf,
 		return false;
 
 	/* we can use hardcoded curve for plain SRGB TF */
-	if (output_tf->type == TF_TYPE_PREDEFINED &&
+	if (output_tf->type == TF_TYPE_PREDEFINED && canRomBeUsed == true &&
 			output_tf->tf == TRANSFER_FUNCTION_SRGB &&
 			(!mapUserRamp && ramp->type == GAMMA_RGB_256))
 		return true;
@@ -1430,7 +1430,6 @@ bool mod_color_calculate_regamma_params(struct dc_transfer_func *output_tf,
 				MAX_HW_POINTS,
 				coordinates_x, tf == TRANSFER_FUNCTION_SRGB ? true:false);
 	}
-
 	map_regamma_hw_to_x_user(ramp, coeff, rgb_user,
 			coordinates_x, axix_x, rgb_regamma,
 			MAX_HW_POINTS, tf_pts,
@@ -1659,7 +1658,8 @@ bool mod_color_calculate_degamma_params(struct dc_transfer_func *input_tf,
 
 
 bool  mod_color_calculate_curve(enum dc_transfer_func_predefined trans,
-				struct dc_transfer_func_distributed_points *points)
+				struct dc_transfer_func_distributed_points *points,
+				uint32_t sdr_ref_white_level)
 {
 	uint32_t i;
 	bool ret = false;
@@ -1693,7 +1693,7 @@ bool  mod_color_calculate_curve(enum dc_transfer_func_predefined trans,
 		build_pq(rgb_regamma,
 				MAX_HW_POINTS,
 				coordinates_x,
-				80);
+				sdr_ref_white_level);
 		for (i = 0; i <= MAX_HW_POINTS ; i++) {
 			points->red[i]    = rgb_regamma[i].r;
 			points->green[i]  = rgb_regamma[i].g;

drivers/gpu/drm/amd/display/modules/color/color_gamma.h

@@ -78,13 +78,14 @@ void precompute_pq(void);
 void precompute_de_pq(void);
 
 bool mod_color_calculate_regamma_params(struct dc_transfer_func *output_tf,
-		const struct dc_gamma *ramp, bool mapUserRamp);
+		const struct dc_gamma *ramp, bool mapUserRamp, bool canRomBeUsed);
 
 bool mod_color_calculate_degamma_params(struct dc_transfer_func *output_tf,
 		const struct dc_gamma *ramp, bool mapUserRamp);
 
 bool mod_color_calculate_curve(enum dc_transfer_func_predefined  trans,
-		struct dc_transfer_func_distributed_points *points);
+		struct dc_transfer_func_distributed_points *points,
+		uint32_t sdr_ref_white_level);
 
 bool mod_color_calculate_degamma_curve(enum dc_transfer_func_predefined trans,
 				struct dc_transfer_func_distributed_points *points);