From 822a00739dc1505a02a3fa62ac3e4316397ccdd2 Mon Sep 17 00:00:00 2001
From: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Date: Thu, 8 Sep 2022 11:11:47 -0400
Subject: drm/amd/display: Add explicit FIFO disable for DP blank
Git-commit: 85096a73f4dc223b5848e41ce40afc5ee913079e
Patch-mainline: v6.0
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225 jsc#PED-2849
[Why]
We rely on DMCUB to do this when disabling the link but it should
actually come before we disable the DP VID stream.
If we don't then the FIFO can end up with underflow that persists
the next time it's enabled.
[How]
Add a DCN314 specific blank sequence that will disable the DIG FIFO
first.
Reviewed-by: Syed Hassan <Syed.Hassan@amd.com>
Acked-by: Jasdeep Dhillon <jdhillon@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
.../display/dc/dcn314/dcn314_dio_stream_encoder.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_dio_stream_encoder.c b/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_dio_stream_encoder.c
index 52b71b2fef67..8c0ab013764e 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_dio_stream_encoder.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_dio_stream_encoder.c
@@ -262,6 +262,16 @@ static bool is_two_pixels_per_containter(const struct dc_crtc_timing *timing)
return two_pix;
}
+void enc314_stream_encoder_dp_blank(
+ struct dc_link *link,
+ struct stream_encoder *enc)
+{
+ /* New to DCN314 - disable the FIFO before VID stream disable. */
+ enc314_disable_fifo(enc);
+
+ enc1_stream_encoder_dp_blank(link, enc);
+}
+
static void enc314_stream_encoder_dp_unblank(
struct dc_link *link,
struct stream_encoder *enc,
@@ -411,7 +421,7 @@ static const struct stream_encoder_funcs dcn314_str_enc_funcs = {
.stop_dp_info_packets =
enc1_stream_encoder_stop_dp_info_packets,
.dp_blank =
- enc1_stream_encoder_dp_blank,
+ enc314_stream_encoder_dp_blank,
.dp_unblank =
enc314_stream_encoder_dp_unblank,
.audio_mute_control = enc3_audio_mute_control,
--
2.38.1