drm/amd/display: Block FPO According to Luminance Delta

[Description]
 - Block FPO if the max stretch refresh rate is low enough
   to cause a flicker by storing the maximum safe refresh
   decrease from nominal in stream.
 - Brought over various Freesync Luminance functions to dc. Use these
   new functions to block fpo if we will flicker.
 - Generalized increase/reduce dependent functions to reduce code clutter
   and allow for easier use.
 - Added a debug option to enable the feature. Disabled by default.

Co-authored-by: Ethan Bitnun <etbitnun@amd.com>
Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Ethan Bitnun <etbitnun@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/dc_stream.h b/drivers/gpu/drm/amd/display/dc/dc_stream.h
index e5dbbc6089a5..3d0adf8838ca 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_stream.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_stream.h
@@ -160,6 +160,18 @@ struct dc_stream_debug_options {
 	char force_odm_combine_segments;
 };
 
+#define LUMINANCE_DATA_TABLE_SIZE 10
+
+struct luminance_data {
+	bool is_valid;
+	int refresh_rate_hz[LUMINANCE_DATA_TABLE_SIZE];
+	int luminance_millinits[LUMINANCE_DATA_TABLE_SIZE];
+	int flicker_criteria_milli_nits_GAMING;
+	int flicker_criteria_milli_nits_STATIC;
+	int nominal_refresh_rate;
+	int dm_max_decrease_from_nominal;
+};
+
 struct dc_stream_state {
 	// sink is deprecated, new code should not reference
 	// this pointer
@@ -286,6 +298,8 @@ struct dc_stream_state {
 	bool vblank_synchronized;
 	bool fpo_in_use;
 	bool is_phantom;
+
+	struct luminance_data lumin_data;
 };
 
 #define ABM_LEVEL_IMMEDIATE_DISABLE 255