drm/amd/display: Fix bugs causing Hawaii and Bonaire not light up.

Signed-off-by: Zeyu Fan <Zeyu.Fan@amd.com>
Acked-by: Jordan Lazare <Jordan.Lazare@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/bios/dce110/command_table_helper_dce110.c

@@ -186,7 +186,7 @@ static uint8_t dig_encoder_sel_to_atom(enum engine_id id)
 		break;
 	}
 
-	return atom_dig_encoder_sel;
+	return 0;
 }
 
 static bool clock_source_id_to_atom(

drivers/gpu/drm/amd/display/dc/bios/dce112/command_table_helper_dce112.c

@@ -183,7 +183,7 @@ static uint8_t dig_encoder_sel_to_atom(enum engine_id id)
 		break;
 	}
 
-	return atom_dig_encoder_sel;
+	return 0;
 }
 
 static bool clock_source_id_to_atom(

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

@@ -1281,7 +1281,7 @@ void dce110_link_encoder_enable_dp_output(
 	configure_encoder(enc110, link_settings);
 
 	cntl.action = TRANSMITTER_CONTROL_ENABLE;
-	cntl.engine_id = ENGINE_ID_UNKNOWN;
+	cntl.engine_id = enc->preferred_engine;
 	cntl.transmitter = enc110->base.transmitter;
 	cntl.pll_id = clock_source;
 	cntl.signal = SIGNAL_TYPE_DISPLAY_PORT;