drm/amd/display: fix code to control 48mhz refclk

[Why]
The SMU message to enable this feature looks at argument. Previous code
didn't send right argument. This change will allow the feature to be
be enabled.

[How]
Fixed one issue where SMU message to enable the feature was sent without
setting the parameter.
Signed-off-by: Eric Yang <Eric.Yang2@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c

@@ -649,8 +649,9 @@ void rn_clk_mgr_construct(
 			pp_smu->rn_funcs.set_wm_ranges(&pp_smu->rn_funcs.pp_smu, &ranges);
 	}
 
+	if (!IS_FPGA_MAXIMUS_DC(ctx->dce_environment)) {
 		/* enable powerfeatures when displaycount goes to 0 */
-	if (!debug->disable_48mhz_pwrdwn)
-		rn_vbios_smu_enable_48mhz_tmdp_refclk_pwrdwn(clk_mgr);
+		rn_vbios_smu_enable_48mhz_tmdp_refclk_pwrdwn(clk_mgr, !debug->disable_48mhz_pwrdwn);
+	}
 }
 

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr_vbios_smu.c

@@ -190,12 +190,12 @@ void rn_vbios_smu_set_dcn_low_power_state(struct clk_mgr_internal *clk_mgr, enum
 		disp_count);
 }
 
-void rn_vbios_smu_enable_48mhz_tmdp_refclk_pwrdwn(struct clk_mgr_internal *clk_mgr)
+void rn_vbios_smu_enable_48mhz_tmdp_refclk_pwrdwn(struct clk_mgr_internal *clk_mgr, bool enable)
 {
 	rn_vbios_smu_send_msg_with_param(
 			clk_mgr,
 			VBIOSSMC_MSG_EnableTmdp48MHzRefclkPwrDown,
-			0);
+			enable);
 }
 
 void rn_vbios_smu_enable_pme_wa(struct clk_mgr_internal *clk_mgr)

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr_vbios_smu.h

@@ -34,7 +34,7 @@ int rn_vbios_smu_set_min_deep_sleep_dcfclk(struct clk_mgr_internal *clk_mgr, int
 void rn_vbios_smu_set_phyclk(struct clk_mgr_internal *clk_mgr, int requested_phyclk_khz);
 int rn_vbios_smu_set_dppclk(struct clk_mgr_internal *clk_mgr, int requested_dpp_khz);
 void rn_vbios_smu_set_dcn_low_power_state(struct clk_mgr_internal *clk_mgr, int display_count);
-void rn_vbios_smu_enable_48mhz_tmdp_refclk_pwrdwn(struct clk_mgr_internal *clk_mgr);
+void rn_vbios_smu_enable_48mhz_tmdp_refclk_pwrdwn(struct clk_mgr_internal *clk_mgr, bool enable);
 void rn_vbios_smu_enable_pme_wa(struct clk_mgr_internal *clk_mgr);
 
 #endif /* DAL_DC_DCN10_RV1_CLK_MGR_VBIOS_SMU_H_ */

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

@@ -804,7 +804,7 @@ static const struct dc_debug_options debug_defaults_drv = {
 		.disable_pplib_wm_range = false,
 		.scl_reset_length10 = true,
 		.sanity_checks = true,
-		.disable_48mhz_pwrdwn = true,
+		.disable_48mhz_pwrdwn = false,
 };
 
 static const struct dc_debug_options debug_defaults_diags = {