drm/amd/display: Add enable/disable FIFO callbacks to stream setup

[Why]
We don't write out attributes after disabling and re-enabling the link
on some monitors, causing some, but not all, HDMI displays to fail to
lightup on DCN314.

[How]
Firmware used to do this after DIG link setup.

Since firmware is no longer doing this to support USB4 and dynamic link
remapping we'll need to add this to driver in the equivalent paths.

New optional callbacks were created in the stream encoder interface and
implementations were added for DCN314.

Reviewed-by: Michael Strauss <Michael.Strauss@amd.com>
Acked-by: Alex Hung <alex.hung@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>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/inc/hw/stream_encoder.h b/drivers/gpu/drm/amd/display/dc/inc/hw/stream_encoder.h
index 456dbe9f2264..42afa1952890 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/hw/stream_encoder.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/hw/stream_encoder.h
@@ -252,6 +252,8 @@ struct stream_encoder_funcs {
 
 	void (*set_input_mode)(
 		struct stream_encoder *enc, unsigned int pix_per_container);
+	void (*enable_fifo)(struct stream_encoder *enc);
+	void (*disable_fifo)(struct stream_encoder *enc);
 };
 
 struct hpo_dp_stream_encoder_state {