drm/amd/display: Add dcn401 DIG fifo enable/disable

[Why]
Found while hotplugging MST daisy chain displays. Changing dispclk
during this sequence caused SMU hang due to DIG fifo not being disabled
correctly (caused by missing functions).

[How]
Adding disable/enable DIG fifo functions for dcn401
Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Relja Vojvodic <relja.vojvodic@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn35/dcn35_dio_stream_encoder.c

@@ -392,7 +392,7 @@ static void enc35_reset_fifo(struct stream_encoder *enc, bool reset)
 		udelay(10);
 }
 
-static void enc35_disable_fifo(struct stream_encoder *enc)
+void enc35_disable_fifo(struct stream_encoder *enc)
 {
 	struct dcn10_stream_encoder *enc1 = DCN10STRENC_FROM_STRENC(enc);
 
@@ -401,7 +401,7 @@ static void enc35_disable_fifo(struct stream_encoder *enc)
 	REG_UPDATE(DIG_FE_CLK_CNTL, DIG_FE_CLK_EN, 0);
 }
 
-static void enc35_enable_fifo(struct stream_encoder *enc)
+void enc35_enable_fifo(struct stream_encoder *enc)
 {
 	struct dcn10_stream_encoder *enc1 = DCN10STRENC_FROM_STRENC(enc);
 

drivers/gpu/drm/amd/display/dc/dcn35/dcn35_dio_stream_encoder.h

@@ -322,5 +322,11 @@ void enc3_dp_set_dsc_pps_info_packet(
 	uint8_t *dsc_packed_pps,
 	bool immediate_update);
 
+void enc35_disable_fifo(
+	struct stream_encoder *enc);
+
+void enc35_enable_fifo(
+	struct stream_encoder *enc);
+
 
 #endif /* __DC_DIO_STREAM_ENCODER_DCN35_H__ */

drivers/gpu/drm/amd/display/dc/dcn401/dcn401_dio_stream_encoder.c

@@ -27,6 +27,7 @@
 #include "dc_bios_types.h"
 #include "dcn30/dcn30_dio_stream_encoder.h"
 #include "dcn32/dcn32_dio_stream_encoder.h"
+#include "dcn35/dcn35_dio_stream_encoder.h"
 
 #include "dcn401_dio_stream_encoder.h"
 #include "reg_helper.h"
@@ -764,7 +765,8 @@ static const struct stream_encoder_funcs dcn401_str_enc_funcs = {
 	.enable_stream = enc401_stream_encoder_enable,
 
 	.set_input_mode = enc401_set_dig_input_mode,
-	.enable_fifo = enc32_enable_fifo,
+	.enable_fifo = enc35_enable_fifo,
+	.disable_fifo = enc35_disable_fifo,
 	.map_stream_to_link = enc401_stream_encoder_map_to_link,
 };