[PATCH 22/46] drm/amd/display: Restrict multi-disp support for in-game FAMS

[Wayne Lin]

From: Iswara Nagulendran <iswara.nagulendran at amd.com>

[HOW&WHY]
In multi-monitor cases the VBLANK stretch that is required to align both
monitors may be so large that it may create issues for gaming performance.

Use debug value to restrict in-game FAMS support for multi-disp use case.

Reviewed-by: Harry Vanzylldejong <harry.vanzylldejong at amd.com>
Acked-by: Wayne Lin <wayne.lin at amd.com>
Signed-off-by: Iswara Nagulendran <iswara.nagulendran at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dc.h                       | 8 +++++++-
 .../gpu/drm/amd/display/dc/dcn32/dcn32_resource_helpers.c | 4 +++-
 .../drm/amd/display/dc/resource/dcn30/dcn30_resource.c    | 2 +-
 3 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index a3ebe4f00779..3048d5a0e87d 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -499,6 +499,12 @@ enum dcc_option {
 	DCC_HALF_REQ_DISALBE = 2,
 };
 
+enum in_game_fams_config {
+	INGAME_FAMS_SINGLE_DISP_ENABLE, // enable in-game fams
+	INGAME_FAMS_DISABLE, // disable in-game fams
+	INGAME_FAMS_MULTI_DISP_ENABLE, //enable in-game fams for multi-display
+};
+
 /**
  * enum pipe_split_policy - Pipe split strategy supported by DCN
  *
@@ -951,7 +957,7 @@ struct dc_debug_options {
 	/* Enable dmub aux for legacy ddc */
 	bool enable_dmub_aux_for_legacy_ddc;
 	bool disable_fams;
-	bool disable_fams_gaming;
+	enum in_game_fams_config disable_fams_gaming;
 	/* FEC/PSR1 sequence enable delay in 100us */
 	uint8_t fec_enable_delay_in100us;
 	bool enable_driver_sequence_debug;
diff --git a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource_helpers.c b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource_helpers.c
index 6472da2c361e..a8c36eda1d09 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource_helpers.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource_helpers.c
@@ -580,7 +580,9 @@ struct dc_stream_state *dcn32_can_support_mclk_switch_using_fw_based_vblank_stre
 	if (!fpo_candidate_stream->allow_freesync)
 		return NULL;
 
-	if (fpo_candidate_stream->vrr_active_variable && dc->debug.disable_fams_gaming)
+	if (fpo_candidate_stream->vrr_active_variable &&
+	((dc->debug.disable_fams_gaming == INGAME_FAMS_DISABLE) ||
+	(context->stream_count > 1 && !(dc->debug.disable_fams_gaming == INGAME_FAMS_MULTI_DISP_ENABLE))))
 		return NULL;
 
 	return fpo_candidate_stream;
diff --git a/drivers/gpu/drm/amd/display/dc/resource/dcn30/dcn30_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dcn30/dcn30_resource.c
index fa1305f04341..1ce727351c39 100644
--- a/drivers/gpu/drm/amd/display/dc/resource/dcn30/dcn30_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/resource/dcn30/dcn30_resource.c
@@ -1996,7 +1996,7 @@ bool dcn30_can_support_mclk_switch_using_fw_based_vblank_stretch(struct dc *dc,
 	if (!context->streams[0]->allow_freesync)
 		return false;
 
-	if (context->streams[0]->vrr_active_variable && dc->debug.disable_fams_gaming)
+	if (context->streams[0]->vrr_active_variable && (dc->debug.disable_fams_gaming == INGAME_FAMS_DISABLE))
 		return false;
 
 	context->streams[0]->fpo_in_use = true;
-- 
2.37.3