drm/amd/display: DAL3 RV get DPREFCLK SpreadspectrumInfo from smu_info

Signed-off-by: Hersen Wu <hersenxs.wu@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c

@@ -1136,6 +1136,7 @@ static enum bp_result get_ss_info_v4_2(
 {
 	enum bp_result result = BP_RESULT_OK;
 	struct atom_display_controller_info_v4_2 *disp_cntl_tbl = NULL;
+	struct atom_smu_info_v3_1 *smu_info = NULL;
 
 	if (!ss_info)
 		return BP_RESULT_BADINPUT;
@@ -1143,11 +1144,18 @@ static enum bp_result get_ss_info_v4_2(
 	if (!DATA_TABLES(dce_info))
 		return BP_RESULT_BADBIOSTABLE;
 
+	if (!DATA_TABLES(smu_info))
+		return BP_RESULT_BADBIOSTABLE;
+
 	disp_cntl_tbl =  GET_IMAGE(struct atom_display_controller_info_v4_2,
 							DATA_TABLES(dce_info));
 	if (!disp_cntl_tbl)
 		return BP_RESULT_BADBIOSTABLE;
 
+	smu_info =  GET_IMAGE(struct atom_smu_info_v3_1, DATA_TABLES(smu_info));
+	if (!smu_info)
+		return BP_RESULT_BADBIOSTABLE;
+
 	ss_info->type.STEP_AND_DELAY_INFO = false;
 	ss_info->spread_percentage_divider = 1000;
 	/* BIOS no longer uses target clock.  Always enable for now */
@@ -1173,10 +1181,10 @@ static enum bp_result get_ss_info_v4_2(
 	/* TODO LVDS not support anymore? */
 	case AS_SIGNAL_TYPE_DISPLAY_PORT:
 		ss_info->spread_spectrum_percentage =
-				disp_cntl_tbl->dp_ss_percentage;
+				smu_info->gpuclk_ss_percentage;
 		ss_info->spread_spectrum_range =
-				disp_cntl_tbl->dp_ss_rate_10hz * 10;
-		if (disp_cntl_tbl->dp_ss_mode & ATOM_SS_CENTRE_SPREAD_MODE)
+				smu_info->gpuclk_ss_rate_10hz * 10;
+		if (smu_info->gpuclk_ss_mode & ATOM_SS_CENTRE_SPREAD_MODE)
 			ss_info->type.CENTER_MODE = true;
 		break;
 	case AS_SIGNAL_TYPE_GPU_PLL:

drivers/gpu/drm/amd/display/dc/dce/dce_clocks.c

@@ -246,6 +246,33 @@ static int dce_clocks_get_dp_ref_freq(struct display_clock *clk)
 	return dp_ref_clk_khz;
 }
 
+/* TODO: This is DCN DPREFCLK: it could be program by DENTIST by VBIOS
+ * or CLK0_CLK11 by SMU. For DCE120, it is wlays 600Mhz. Will re-visit
+ * clock implementation
+ */
+static int dce_clocks_get_dp_ref_freq_wrkaround(struct display_clock *clk)
+{
+	struct dce_disp_clk *clk_dce = TO_DCE_CLOCKS(clk);
+	int dp_ref_clk_khz = 600000;
+
+	if (clk_dce->ss_on_dprefclk && clk_dce->dprefclk_ss_divider != 0) {
+		struct fixed32_32 ss_percentage = dal_fixed32_32_div_int(
+				dal_fixed32_32_from_fraction(
+						clk_dce->dprefclk_ss_percentage,
+						clk_dce->dprefclk_ss_divider), 200);
+		struct fixed32_32 adj_dp_ref_clk_khz;
+
+		ss_percentage = dal_fixed32_32_sub(dal_fixed32_32_one,
+								ss_percentage);
+		adj_dp_ref_clk_khz =
+			dal_fixed32_32_mul_int(
+				ss_percentage,
+				dp_ref_clk_khz);
+		dp_ref_clk_khz = dal_fixed32_32_floor(adj_dp_ref_clk_khz);
+	}
+
+	return dp_ref_clk_khz;
+}
 static enum dm_pp_clocks_state dce_get_required_clocks_state(
 	struct display_clock *clk,
 	struct state_dependent_clocks *req_clocks)
@@ -605,7 +632,7 @@ static bool dce_apply_clock_voltage_request(
 
 
 static const struct display_clock_funcs dce120_funcs = {
-	.get_dp_ref_clk_frequency = dce_clocks_get_dp_ref_freq,
+	.get_dp_ref_clk_frequency = dce_clocks_get_dp_ref_freq_wrkaround,
 	.apply_clock_voltage_request = dce_apply_clock_voltage_request,
 	.set_clock = dce112_set_clock
 };