drm/amd/display: fill in clock values when DPM is not enabled

[Why]
For individual feature testing, PMFW may not report all clock
values back. Driver will default them to 0 but this will
cause the BB table to be skipped and default to one state
with max clocks.

[How]
Add helper function to scan through initial clock values and
populate them with default clock limits so that BB table
can be built.
Add dpm_enabled flag to check when DPM is not enabled and
to trigger helper function.
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Jasdeep Dhillon <jdhillon@amd.com>
Signed-off-by: Samson Tam <samson.tam@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/clk_mgr/dcn32/dcn32_clk_mgr.c

@@ -156,12 +156,14 @@ void dcn32_init_clocks(struct clk_mgr *clk_mgr_base)
 {
 	struct clk_mgr_internal *clk_mgr = TO_CLK_MGR_INTERNAL(clk_mgr_base);
 	unsigned int num_levels;
+	unsigned int num_dcfclk_levels, num_dtbclk_levels, num_dispclk_levels;
 
 	memset(&(clk_mgr_base->clks), 0, sizeof(struct dc_clocks));
 	clk_mgr_base->clks.p_state_change_support = true;
 	clk_mgr_base->clks.prev_p_state_change_support = true;
 	clk_mgr_base->clks.fclk_prev_p_state_change_support = true;
 	clk_mgr->smu_present = false;
+	clk_mgr->dpm_present = false;
 
 	if (!clk_mgr_base->bw_params)
 		return;
@@ -179,6 +181,7 @@ void dcn32_init_clocks(struct clk_mgr *clk_mgr_base)
 	dcn32_init_single_clock(clk_mgr, PPCLK_DCFCLK,
 			&clk_mgr_base->bw_params->clk_table.entries[0].dcfclk_mhz,
 			&num_levels);
+	num_dcfclk_levels = num_levels;
 
 	/* SOCCLK */
 	dcn32_init_single_clock(clk_mgr, PPCLK_SOCCLK,
@@ -189,11 +192,16 @@ void dcn32_init_clocks(struct clk_mgr *clk_mgr_base)
 		dcn32_init_single_clock(clk_mgr, PPCLK_DTBCLK,
 				&clk_mgr_base->bw_params->clk_table.entries[0].dtbclk_mhz,
 				&num_levels);
+	num_dtbclk_levels = num_levels;
 
 	/* DISPCLK */
 	dcn32_init_single_clock(clk_mgr, PPCLK_DISPCLK,
 			&clk_mgr_base->bw_params->clk_table.entries[0].dispclk_mhz,
 			&num_levels);
+	num_dispclk_levels = num_levels;
+
+	if (num_dcfclk_levels && num_dtbclk_levels && num_dispclk_levels)
+		clk_mgr->dpm_present = true;
 
 	if (clk_mgr_base->ctx->dc->debug.min_disp_clk_khz) {
 		unsigned int i;
@@ -658,6 +666,12 @@ static void dcn32_get_memclk_states_from_smu(struct clk_mgr *clk_mgr_base)
 			&num_levels);
 	clk_mgr_base->bw_params->clk_table.num_entries = num_levels ? num_levels : 1;
 
+	if (clk_mgr->dpm_present && !num_levels)
+		clk_mgr->dpm_present = false;
+
+	if (!clk_mgr->dpm_present)
+		dcn32_patch_dpm_table(clk_mgr_base->bw_params);
+
 	DC_FP_START();
 	/* Refresh bounding box */
 	clk_mgr_base->ctx->dc->res_pool->funcs->update_bw_bounding_box(

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

@@ -1926,6 +1926,45 @@ static void remove_entry_from_table_at_index(struct _vcs_dpi_voltage_scaling_st
 	memset(&table[--(*num_entries)], 0, sizeof(struct _vcs_dpi_voltage_scaling_st));
 }
 
+void dcn32_patch_dpm_table(struct clk_bw_params *bw_params)
+{
+	int i;
+	unsigned int max_dcfclk_mhz = 0, max_dispclk_mhz = 0, max_dppclk_mhz = 0,
+			max_phyclk_mhz = 0, max_dtbclk_mhz = 0, max_fclk_mhz = 0, max_uclk_mhz = 0;
+
+	for (i = 0; i < MAX_NUM_DPM_LVL; i++) {
+		if (bw_params->clk_table.entries[i].dcfclk_mhz > max_dcfclk_mhz)
+			max_dcfclk_mhz = bw_params->clk_table.entries[i].dcfclk_mhz;
+		if (bw_params->clk_table.entries[i].fclk_mhz > max_fclk_mhz)
+			max_fclk_mhz = bw_params->clk_table.entries[i].fclk_mhz;
+		if (bw_params->clk_table.entries[i].memclk_mhz > max_uclk_mhz)
+			max_uclk_mhz = bw_params->clk_table.entries[i].memclk_mhz;
+		if (bw_params->clk_table.entries[i].dispclk_mhz > max_dispclk_mhz)
+			max_dispclk_mhz = bw_params->clk_table.entries[i].dispclk_mhz;
+		if (bw_params->clk_table.entries[i].dppclk_mhz > max_dppclk_mhz)
+			max_dppclk_mhz = bw_params->clk_table.entries[i].dppclk_mhz;
+		if (bw_params->clk_table.entries[i].phyclk_mhz > max_phyclk_mhz)
+			max_phyclk_mhz = bw_params->clk_table.entries[i].phyclk_mhz;
+		if (bw_params->clk_table.entries[i].dtbclk_mhz > max_dtbclk_mhz)
+			max_dtbclk_mhz = bw_params->clk_table.entries[i].dtbclk_mhz;
+	}
+
+	/* Scan through clock values we currently have and if they are 0,
+	 *  then populate it with dcn3_2_soc.clock_limits[] value.
+	 *
+	 * Do it for DCFCLK, DISPCLK, DTBCLK and UCLK as any of those being
+	 *  0, will cause it to skip building the clock table.
+	 */
+	if (max_dcfclk_mhz == 0)
+		bw_params->clk_table.entries[0].dcfclk_mhz = dcn3_2_soc.clock_limits[0].dcfclk_mhz;
+	if (max_dispclk_mhz == 0)
+		bw_params->clk_table.entries[0].dispclk_mhz = dcn3_2_soc.clock_limits[0].dispclk_mhz;
+	if (max_dtbclk_mhz == 0)
+		bw_params->clk_table.entries[0].dtbclk_mhz = dcn3_2_soc.clock_limits[0].dtbclk_mhz;
+	if (max_uclk_mhz == 0)
+		bw_params->clk_table.entries[0].memclk_mhz = dcn3_2_soc.clock_limits[0].dram_speed_mts / 16;
+}
+
 static int build_synthetic_soc_states(struct clk_bw_params *bw_params,
 		struct _vcs_dpi_voltage_scaling_st *table, unsigned int *num_entries)
 {

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

@@ -77,4 +77,6 @@ int dcn32_find_dummy_latency_index_for_fw_based_mclk_switch(struct dc *dc,
 							    int pipe_cnt,
 							    int vlevel);
 
+void dcn32_patch_dpm_table(struct clk_bw_params *bw_params);
+
 #endif

drivers/gpu/drm/amd/display/dc/inc/hw/clk_mgr_internal.h

@@ -340,6 +340,8 @@ struct clk_mgr_internal {
 	bool smu_present;
 	void *wm_range_table;
 	long long wm_range_table_addr;
+
+	bool dpm_present;
 };
 
 struct clk_mgr_internal_funcs {