drm/amd/display: remove a function that does complex calculation in every frame but not used

[why]
The result of predict_pipe_split calculation is no longer used but the
function is not removed. This will cause unnecessary calculation
of pipe split prediction in every frame update.
Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Acked-by: Stylon Wang <stylon.wang@amd.com>
Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c

@@ -2031,9 +2031,6 @@ int dcn32_populate_dml_pipes_from_context(
 			}
 		}
 
-		DC_FP_START();
-		dcn32_predict_pipe_split(context, &pipes[pipe_cnt]);
-		DC_FP_END();
 
 		pipe_cnt++;
 	}

drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c

@@ -348,90 +348,6 @@ void dcn32_helper_populate_phantom_dlg_params(struct dc *dc,
 	}
 }
 
-/**
- * dcn32_predict_pipe_split - Predict if pipe split will occur for a given DML pipe
- * @context: [in] New DC state to be programmed
- * @pipe_e2e: [in] DML pipe end to end context
- *
- * This function takes in a DML pipe (pipe_e2e) and predicts if pipe split is required (both
- * ODM and MPC). For pipe split, ODM combine is determined by the ODM mode, and MPC combine is
- * determined by DPPClk requirements
- *
- * This function follows the same policy as DML:
- * - Check for ODM combine requirements / policy first
- * - MPC combine is only chosen if there is no ODM combine requirements / policy in place, and
- *   MPC is required
- *
- * Return: Number of splits expected (1 for 2:1 split, 3 for 4:1 split, 0 for no splits).
- */
-uint8_t dcn32_predict_pipe_split(struct dc_state *context,
-				  display_e2e_pipe_params_st *pipe_e2e)
-{
-	double pscl_throughput;
-	double pscl_throughput_chroma;
-	double dpp_clk_single_dpp, clock;
-	double clk_frequency = 0.0;
-	double vco_speed = context->bw_ctx.dml.soc.dispclk_dppclk_vco_speed_mhz;
-	bool total_available_pipes_support = false;
-	uint32_t number_of_dpp = 0;
-	enum odm_combine_mode odm_mode = dm_odm_combine_mode_disabled;
-	double req_dispclk_per_surface = 0;
-	uint8_t num_splits = 0;
-
-	dc_assert_fp_enabled();
-
-	dml32_CalculateODMMode(context->bw_ctx.dml.ip.maximum_pixels_per_line_per_dsc_unit,
-			pipe_e2e->pipe.dest.hactive,
-			pipe_e2e->dout.output_format,
-			pipe_e2e->dout.output_type,
-			pipe_e2e->pipe.dest.odm_combine_policy,
-			context->bw_ctx.dml.soc.clock_limits[context->bw_ctx.dml.soc.num_states - 1].dispclk_mhz,
-			context->bw_ctx.dml.soc.clock_limits[context->bw_ctx.dml.soc.num_states - 1].dispclk_mhz,
-			pipe_e2e->dout.dsc_enable != 0,
-			0, /* TotalNumberOfActiveDPP can be 0 since we're predicting pipe split requirement */
-			context->bw_ctx.dml.ip.max_num_dpp,
-			pipe_e2e->pipe.dest.pixel_rate_mhz,
-			context->bw_ctx.dml.soc.dcn_downspread_percent,
-			context->bw_ctx.dml.ip.dispclk_ramp_margin_percent,
-			context->bw_ctx.dml.soc.dispclk_dppclk_vco_speed_mhz,
-			pipe_e2e->dout.dsc_slices,
-			/* Output */
-			&total_available_pipes_support,
-			&number_of_dpp,
-			&odm_mode,
-			&req_dispclk_per_surface);
-
-	dml32_CalculateSinglePipeDPPCLKAndSCLThroughput(pipe_e2e->pipe.scale_ratio_depth.hscl_ratio,
-			pipe_e2e->pipe.scale_ratio_depth.hscl_ratio_c,
-			pipe_e2e->pipe.scale_ratio_depth.vscl_ratio,
-			pipe_e2e->pipe.scale_ratio_depth.vscl_ratio_c,
-			context->bw_ctx.dml.ip.max_dchub_pscl_bw_pix_per_clk,
-			context->bw_ctx.dml.ip.max_pscl_lb_bw_pix_per_clk,
-			pipe_e2e->pipe.dest.pixel_rate_mhz,
-			pipe_e2e->pipe.src.source_format,
-			pipe_e2e->pipe.scale_taps.htaps,
-			pipe_e2e->pipe.scale_taps.htaps_c,
-			pipe_e2e->pipe.scale_taps.vtaps,
-			pipe_e2e->pipe.scale_taps.vtaps_c,
-			/* Output */
-			&pscl_throughput, &pscl_throughput_chroma,
-			&dpp_clk_single_dpp);
-
-	clock = dpp_clk_single_dpp * (1 + context->bw_ctx.dml.soc.dcn_downspread_percent / 100);
-
-	if (clock > 0)
-		clk_frequency = vco_speed * 4.0 / ((int)(vco_speed * 4.0) / clock);
-
-	if (odm_mode == dm_odm_combine_mode_2to1)
-		num_splits = 1;
-	else if (odm_mode == dm_odm_combine_mode_4to1)
-		num_splits = 3;
-	else if (clk_frequency > context->bw_ctx.dml.soc.clock_limits[context->bw_ctx.dml.soc.num_states - 1].dppclk_mhz)
-		num_splits = 1;
-
-	return num_splits;
-}
-
 static float calculate_net_bw_in_kbytes_sec(struct _vcs_dpi_voltage_scaling_st *entry)
 {
 	float memory_bw_kbytes_sec;

drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.h

@@ -36,9 +36,6 @@ void dcn32_helper_populate_phantom_dlg_params(struct dc *dc,
 					      display_e2e_pipe_params_st *pipes,
 					      int pipe_cnt);
 
-uint8_t dcn32_predict_pipe_split(struct dc_state *context,
-				  display_e2e_pipe_params_st *pipe_e2e);
-
 void dcn32_set_phantom_stream_timing(struct dc *dc,
 				     struct dc_state *context,
 				     struct pipe_ctx *ref_pipe,