drm/amd/display: Resolve Coverity Issues

[WHY]
Remove coverity issues that were originally ignored.

[HOW]
Ran coverity locally on driver, used output report to find existing
coverity issues, resolved them
Reviewed-by: Nicholas Choi <nicholas.choi@amd.com>
Signed-off-by: Daniel Sa <Daniel.Sa@amd.com>
Signed-off-by: Zaeem Mohamed <zaeem.mohamed@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/dml2/dml21/inc/dml_top_types.h

@@ -5,7 +5,6 @@
 #ifndef __DML_TOP_TYPES_H__
 #define __DML_TOP_TYPES_H__
 
-#include "dml_top_types.h"
 #include "dml_top_display_cfg_types.h"
 #include "dml_top_soc_parameter_types.h"
 #include "dml_top_policy_types.h"

drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_dcn4_calcs.c

@@ -2085,7 +2085,11 @@ static void CalculateDCCConfiguration(
 	unsigned int full_swath_bytes_vert_wc_l;
 	unsigned int full_swath_bytes_vert_wc_c;
 
-	yuv420 = dml_is_420(SourcePixelFormat);
+	if (dml_is_420(SourcePixelFormat))
+		yuv420 = 1;
+	else
+		yuv420 = 0;
+
 	horz_div_l = 1;
 	horz_div_c = 1;
 	vert_div_l = 1;
@@ -2553,8 +2557,11 @@ static void calculate_mcache_setting(
 		l->luma_time_factor = (double)l->mvmpg_width_c / l->mvmpg_width_l * 2;
 
 	// The algorithm starts with computing a non-integer, avg_mcache_element_size_l/c:
-	l->avg_mcache_element_size_l = l->meta_row_width_l / *p->num_mcaches_l;
-	if (l->is_dual_plane) {
+	if (*p->num_mcaches_l) {
+		l->avg_mcache_element_size_l = l->meta_row_width_l / *p->num_mcaches_l;
+	}
+
+	if (l->is_dual_plane && *p->num_mcaches_c) {
 		l->avg_mcache_element_size_c = l->meta_row_width_c / *p->num_mcaches_c;
 
 		if (!p->imall_enable || (*p->mall_comb_mcache_l == *p->mall_comb_mcache_c)) {
@@ -2683,9 +2690,9 @@ static double dml_get_return_bandwidth_available(
 	double ideal_fabric_bandwidth = fclk_mhz * (double)soc->fabric_datapath_to_dcn_data_return_bytes;
 	double ideal_dram_bandwidth = dram_bw_mbps; //dram_speed_mts * soc->clk_table.dram_config.channel_count * soc->clk_table.dram_config.channel_width_bytes;
 
-	double derate_sdp_factor = 1;
-	double derate_fabric_factor = 1;
-	double derate_dram_factor = 1;
+	double derate_sdp_factor;
+	double derate_fabric_factor;
+	double derate_dram_factor;
 
 	double derate_sdp_bandwidth;
 	double derate_fabric_bandwidth;
@@ -7209,7 +7216,7 @@ static bool dml_core_mode_support(struct dml2_core_calcs_mode_support_ex *in_out
 	mode_lib->ms.support.WritebackLatencySupport = true;
 	for (k = 0; k <= mode_lib->ms.num_active_planes - 1; k++) {
 		if (display_cfg->stream_descriptors[display_cfg->plane_descriptors[k].stream_index].writeback.enable == true &&
-			(mode_lib->ms.WriteBandwidth[k] > mode_lib->ip.writeback_interface_buffer_size_kbytes * 1024 / mode_lib->soc.qos_parameters.writeback.base_latency_us)) {
+			(mode_lib->ms.WriteBandwidth[k] > mode_lib->ip.writeback_interface_buffer_size_kbytes * 1024 / ((double)mode_lib->soc.qos_parameters.writeback.base_latency_us))) {
 			mode_lib->ms.support.WritebackLatencySupport = false;
 		}
 	}

drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_pmo/dml2_pmo_dcn3.c

@@ -497,7 +497,6 @@ bool pmo_dcn3_optimize_dcc_mcache(struct dml2_pmo_optimize_dcc_mcache_in_out *in
 							in_out->cfg_support_info->plane_support_info[i].dpps_used)) {
 							result = false;
 						} else {
-							free_pipes -= planes_on_stream;
 							break;
 						}
 					} else {
@@ -666,7 +665,7 @@ bool pmo_dcn3_optimize_for_pstate_support(struct dml2_pmo_optimize_for_pstate_su
 	struct dml2_pmo_instance *pmo = in_out->instance;
 	unsigned int stream_index;
 	bool success = false;
-	bool reached_end = true;
+	bool reached_end;
 
 	memcpy(in_out->optimized_display_config, in_out->base_display_config, sizeof(struct display_configuation_with_meta));
 

drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_pmo/dml2_pmo_dcn4_fams2.c

@@ -334,7 +334,6 @@ bool pmo_dcn4_fams2_optimize_dcc_mcache(struct dml2_pmo_optimize_dcc_mcache_in_o
 							in_out->cfg_support_info->plane_support_info[i].dpps_used)) {
 							result = false;
 						} else {
-							free_pipes -= planes_on_stream;
 							break;
 						}
 					} else {
@@ -672,8 +671,6 @@ bool pmo_dcn4_fams2_initialize(struct dml2_pmo_initialize_in_out *in_out)
 			/* populate list */
 			expand_base_strategies(pmo, base_strategy_list_4_display, base_strategy_list_4_display_size, 4);
 			break;
-		default:
-			break;
 		}
 	}
 

drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_top/dml2_top_optimization.c

@@ -219,7 +219,6 @@ bool dml2_top_optimization_perform_optimization_phase_1(struct dml2_optimization
 	copy_display_configuration_with_meta(&l->cur_candidate_display_cfg, params->display_config);
 	highest_state = l->cur_candidate_display_cfg.stage1.min_clk_index_for_latency;
 	lowest_state = 0;
-	cur_state = 0;
 
 	while (highest_state > lowest_state) {
 		cur_state = (highest_state + lowest_state) / 2;