drm/amd/display: fix rn soc bb update

Currently RN SOC bounding box update assumes we will get at least
2 clock states from SMU. This isn't always true and because of special
casing on first clock state we end up with low disp, dpp, dsc and phy
clocks.

This change removes the special casing allowing the first state to
acquire correct clocks.

Signed-off-by: Dmytro Laktyushkin <[email protected]>
Reviewed-by: Eric Yang <[email protected]>
Acked-by: Aurabindo Pillai <[email protected]>
Acked-by: Tony Cheng <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

Author: Dmytro Laktyushkin

drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c

@@ -1374,64 +1374,49 @@ static void update_bw_bounding_box(struct dc *dc, struct clk_bw_params *bw_param
 {
 	struct dcn21_resource_pool *pool = TO_DCN21_RES_POOL(dc->res_pool);
 	struct clk_limit_table *clk_table = &bw_params->clk_table;
-	unsigned int i, j, k;
-	int closest_clk_lvl;
+	struct _vcs_dpi_voltage_scaling_st clock_limits[DC__VOLTAGE_STATES];
+	unsigned int i, j, closest_clk_lvl;
 
 	// Default clock levels are used for diags, which may lead to overclocking.
-	if (!IS_FPGA_MAXIMUS_DC(dc->ctx->dce_environment) && !IS_DIAG_DC(dc->ctx->dce_environment)) {
+	if (!IS_DIAG_DC(dc->ctx->dce_environment)) {
 		dcn2_1_ip.max_num_otg = pool->base.res_cap->num_timing_generator;
 		dcn2_1_ip.max_num_dpp = pool->base.pipe_count;
 		dcn2_1_soc.num_chans = bw_params->num_channels;
 
-		/* Vmin: leave lowest DCN clocks, override with dcfclk, fclk, memclk from fuse */
-		dcn2_1_soc.clock_limits[0].state = 0;
-		dcn2_1_soc.clock_limits[0].dcfclk_mhz = clk_table->entries[0].dcfclk_mhz;
-		dcn2_1_soc.clock_limits[0].fabricclk_mhz = clk_table->entries[0].fclk_mhz;
-		dcn2_1_soc.clock_limits[0].socclk_mhz = clk_table->entries[0].socclk_mhz;
-		dcn2_1_soc.clock_limits[0].dram_speed_mts = clk_table->entries[0].memclk_mhz * 2;
-
-		/*
-		 * Other levels: find closest DCN clocks that fit the given clock limit using dcfclk
-		 * as indicator
-		 */
-
-		closest_clk_lvl = -1;
-		/* index currently being filled */
-		k = 1;
-		for (i = 1; i < clk_table->num_entries; i++) {
-			/* loop backwards, skip duplicate state*/
-			for (j = dcn2_1_soc.num_states - 1; j >= k; j--) {
+		ASSERT(clk_table->num_entries);
+		for (i = 0; i < clk_table->num_entries; i++) {
+			/* loop backwards*/
+			for (closest_clk_lvl = 0, j = dcn2_1_soc.num_states - 1; j >= 0; j--) {
 				if ((unsigned int) dcn2_1_soc.clock_limits[j].dcfclk_mhz <= clk_table->entries[i].dcfclk_mhz) {
 					closest_clk_lvl = j;
 					break;
 				}
 			}
 
-			/* if found a lvl that fits, use the DCN clks from it, if not, go to next clk limit*/
-			if (closest_clk_lvl != -1) {
-				dcn2_1_soc.clock_limits[k].state = i;
-				dcn2_1_soc.clock_limits[k].dcfclk_mhz = clk_table->entries[i].dcfclk_mhz;
-				dcn2_1_soc.clock_limits[k].fabricclk_mhz = clk_table->entries[i].fclk_mhz;
-				dcn2_1_soc.clock_limits[k].socclk_mhz = clk_table->entries[i].socclk_mhz;
-				dcn2_1_soc.clock_limits[k].dram_speed_mts = clk_table->entries[i].memclk_mhz * 2;
-
-				dcn2_1_soc.clock_limits[k].dispclk_mhz = dcn2_1_soc.clock_limits[closest_clk_lvl].dispclk_mhz;
-				dcn2_1_soc.clock_limits[k].dppclk_mhz = dcn2_1_soc.clock_limits[closest_clk_lvl].dppclk_mhz;
-				dcn2_1_soc.clock_limits[k].dram_bw_per_chan_gbps = dcn2_1_soc.clock_limits[closest_clk_lvl].dram_bw_per_chan_gbps;
-				dcn2_1_soc.clock_limits[k].dscclk_mhz = dcn2_1_soc.clock_limits[closest_clk_lvl].dscclk_mhz;
-				dcn2_1_soc.clock_limits[k].dtbclk_mhz = dcn2_1_soc.clock_limits[closest_clk_lvl].dtbclk_mhz;
-				dcn2_1_soc.clock_limits[k].phyclk_d18_mhz = dcn2_1_soc.clock_limits[closest_clk_lvl].phyclk_d18_mhz;
-				dcn2_1_soc.clock_limits[k].phyclk_mhz = dcn2_1_soc.clock_limits[closest_clk_lvl].phyclk_mhz;
-				k++;
-			}
+			clock_limits[i].state = i;
+			clock_limits[i].dcfclk_mhz = clk_table->entries[i].dcfclk_mhz;
+			clock_limits[i].fabricclk_mhz = clk_table->entries[i].fclk_mhz;
+			clock_limits[i].socclk_mhz = clk_table->entries[i].socclk_mhz;
+			clock_limits[i].dram_speed_mts = clk_table->entries[i].memclk_mhz * 2;
+
+			clock_limits[i].dispclk_mhz = dcn2_1_soc.clock_limits[closest_clk_lvl].dispclk_mhz;
+			clock_limits[i].dppclk_mhz = dcn2_1_soc.clock_limits[closest_clk_lvl].dppclk_mhz;
+			clock_limits[i].dram_bw_per_chan_gbps = dcn2_1_soc.clock_limits[closest_clk_lvl].dram_bw_per_chan_gbps;
+			clock_limits[i].dscclk_mhz = dcn2_1_soc.clock_limits[closest_clk_lvl].dscclk_mhz;
+			clock_limits[i].dtbclk_mhz = dcn2_1_soc.clock_limits[closest_clk_lvl].dtbclk_mhz;
+			clock_limits[i].phyclk_d18_mhz = dcn2_1_soc.clock_limits[closest_clk_lvl].phyclk_d18_mhz;
+			clock_limits[i].phyclk_mhz = dcn2_1_soc.clock_limits[closest_clk_lvl].phyclk_mhz;
+		}
+		for (i = 0; i < clk_table->num_entries; i++)
+			dcn2_1_soc.clock_limits[i] = clock_limits[i];
+		if (clk_table->num_entries) {
+			dcn2_1_soc.num_states = clk_table->num_entries;
+			/* duplicate last level */
+			dcn2_1_soc.clock_limits[dcn2_1_soc.num_states] = dcn2_1_soc.clock_limits[dcn2_1_soc.num_states - 1];
+			dcn2_1_soc.clock_limits[dcn2_1_soc.num_states].state = dcn2_1_soc.num_states;
 		}
-		dcn2_1_soc.num_states = k;
 	}
 
-	/* duplicate last level */
-	dcn2_1_soc.clock_limits[dcn2_1_soc.num_states] = dcn2_1_soc.clock_limits[dcn2_1_soc.num_states - 1];
-	dcn2_1_soc.clock_limits[dcn2_1_soc.num_states].state = dcn2_1_soc.num_states;
-
 	dml_init_instance(&dc->dml, &dcn2_1_soc, &dcn2_1_ip, DML_PROJECT_DCN21);
 }