drm/amd/display: Update clock table to include highest clock setting

[Why]
Currently, the clk manager matches SocVoltage with voltage from
fused settings (dfPstate clock table). And then corresponding clocks
are selected.

However in certain situations, this leads to clk manager not
including at least one entry with highest supported clock setting.

[How]
Update the clk manager to include at least one entry with highest
supported clock setting.

Reviewed-by: Pavle Kotarac <[email protected]>
Acked-by: Qingqing Zhuo <[email protected]>
Signed-off-by: Swapnil Patel <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

Author: Swapnil Patel

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn301/vg_clk_mgr.c

@@ -529,6 +529,19 @@ static struct clk_bw_params vg_bw_params = {
 
 };
 
+static uint32_t find_max_clk_value(const uint32_t clocks[], uint32_t num_clocks)
+{
+	uint32_t max = 0;
+	int i;
+
+	for (i = 0; i < num_clocks; ++i) {
+		if (clocks[i] > max)
+			max = clocks[i];
+	}
+
+	return max;
+}
+
 static unsigned int find_dcfclk_for_voltage(const struct vg_dpm_clocks *clock_table,
 		unsigned int voltage)
 {
@@ -572,12 +585,16 @@ static void vg_clk_mgr_helper_populate_bw_params(
 
 	bw_params->clk_table.num_entries = j + 1;
 
-	for (i = 0; i < bw_params->clk_table.num_entries; i++, j--) {
+	for (i = 0; i < bw_params->clk_table.num_entries - 1; i++, j--) {
 		bw_params->clk_table.entries[i].fclk_mhz = clock_table->DfPstateTable[j].fclk;
 		bw_params->clk_table.entries[i].memclk_mhz = clock_table->DfPstateTable[j].memclk;
 		bw_params->clk_table.entries[i].voltage = clock_table->DfPstateTable[j].voltage;
 		bw_params->clk_table.entries[i].dcfclk_mhz = find_dcfclk_for_voltage(clock_table, clock_table->DfPstateTable[j].voltage);
 	}
+	bw_params->clk_table.entries[i].fclk_mhz = clock_table->DfPstateTable[j].fclk;
+	bw_params->clk_table.entries[i].memclk_mhz = clock_table->DfPstateTable[j].memclk;
+	bw_params->clk_table.entries[i].voltage = clock_table->DfPstateTable[j].voltage;
+	bw_params->clk_table.entries[i].dcfclk_mhz = find_max_clk_value(clock_table->DcfClocks, VG_NUM_DCFCLK_DPM_LEVELS);
 
 	bw_params->vram_type = bios_info->memory_type;
 	bw_params->num_channels = bios_info->ma_channel_number;