drm/amd/display: add debug option to bypass ssinfo from bios for dcn315

[Why & How]
Add debug option to bypass ssinfo from BIOS for dcn315.

Reviewed-by: Park, Chris <[e-mail]>
Acked-by: Qingqing Zhuo <[e-mail]>
Signed-off-by: Charlene Liu <[e-mail]>
Tested-by: Daniel Wheeler <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn315/dcn315_clk_mgr.c

···
 		struct dccg *dccg)
 {
 	struct dcn315_smu_dpm_clks smu_dpm_clks = { 0 };
+	struct clk_mgr *clk_mgr_base = ctx->dc->clk_mgr;
 
 	clk_mgr->base.base.ctx = ctx;
 	clk_mgr->base.base.funcs = &dcn315_funcs;
···
 	}
 
 	clk_mgr->base.base.dprefclk_khz = 600000;
-	clk_mgr->base.dccg->ref_dtbclk_khz = 600000;
+	clk_mgr->base.base.dprefclk_khz = dcn315_smu_get_dpref_clk(&clk_mgr->base);
+	clk_mgr->base.dccg->ref_dtbclk_khz = clk_mgr->base.base.dprefclk_khz;
 	dce_clock_read_ss_info(&clk_mgr->base);
+	clk_mgr->base.dccg->ref_dtbclk_khz = dce_adjust_dp_ref_freq_for_ss(&clk_mgr->base, clk_mgr->base.base.dprefclk_khz);
 
 	clk_mgr->base.base.bw_params = &dcn315_bw_params;
 

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn315/dcn315_smu.c

···
 			VBIOSSMC_MSG_TransferTableDram2Smu, TABLE_WATERMARKS);
 }
 
+int dcn315_smu_get_dpref_clk(struct clk_mgr_internal *clk_mgr)
+{
+	int dprefclk_get_mhz = -1;
+	if (clk_mgr->smu_present) {
+		dprefclk_get_mhz = dcn315_smu_send_msg_with_param(
+			clk_mgr,
+			VBIOSSMC_MSG_GetDprefclkFreq,
+			0);
+	}
+	return (dprefclk_get_mhz * 1000);
+}
+
+int dcn315_smu_get_smu_fclk(struct clk_mgr_internal *clk_mgr)
+{
+	int fclk_get_mhz = -1;
+
+	if (clk_mgr->smu_present) {
+		fclk_get_mhz = dcn315_smu_send_msg_with_param(
+			clk_mgr,
+			VBIOSSMC_MSG_GetFclkFrequency,
+			0);
+	}
+	return (fclk_get_mhz * 1000);
+}

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn315/dcn315_smu.h

···
 void dcn315_smu_transfer_wm_table_dram_2_smu(struct clk_mgr_internal *clk_mgr);
 void dcn315_smu_request_voltage_via_phyclk(struct clk_mgr_internal *clk_mgr, int requested_phyclk_khz);
 void dcn315_smu_enable_pme_wa(struct clk_mgr_internal *clk_mgr);
+int dcn315_smu_get_dpref_clk(struct clk_mgr_internal *clk_mgr);
+int dcn315_smu_get_smu_fclk(struct clk_mgr_internal *clk_mgr);
 #endif /* DAL_DC_315_SMU_H_ */

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

···
 				clk_mgr_dce->dprefclk_ss_percentage =
 						info.spread_spectrum_percentage;
 			}
+			if (clk_mgr_dce->base.ctx->dc->debug.ignore_dpref_ss)
+				clk_mgr_dce->dprefclk_ss_percentage = 0;
 		}
 	}
 }