drm/amd/display: Implement DePQ for DCN2

[Why]
Need support for more color management in 10bit
surface.

[How]
Provide support for DePQ for 10bit surface
Signed-off-by: Reza Amini <Reza.Amini@amd.com>
Reviewed-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dpp_cm.c

@@ -149,6 +149,9 @@ void dpp2_set_degamma(
 	case IPP_DEGAMMA_MODE_HW_xvYCC:
 		REG_UPDATE(CM_DGAM_CONTROL, CM_DGAM_LUT_MODE, 2);
 			break;
+	case IPP_DEGAMMA_MODE_USER_PWL:
+		REG_UPDATE(CM_DGAM_CONTROL, CM_DGAM_LUT_MODE, 3);
+		break;
 	default:
 		BREAK_TO_DEBUGGER();
 		break;

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c

@@ -878,6 +878,11 @@ bool dcn20_set_input_transfer_func(struct dc *dc,
 					IPP_DEGAMMA_MODE_BYPASS);
 			break;
 		case TRANSFER_FUNCTION_PQ:
+			dpp_base->funcs->dpp_set_degamma(dpp_base, IPP_DEGAMMA_MODE_USER_PWL);
+			cm_helper_translate_curve_to_degamma_hw_format(tf, &dpp_base->degamma_params);
+			dpp_base->funcs->dpp_program_degamma_pwl(dpp_base, &dpp_base->degamma_params);
+			result = true;
+			break;
 		default:
 			result = false;
 			break;