drm/amd/display: Triplebuffering should not be used by default

Disable triplebuffering by default.
Signed-off-by: Aric Cyr <aric.cyr@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -3375,9 +3375,6 @@ static int amdgpu_dm_initialize_drm_device(struct amdgpu_device *adev)
 		goto fail;
 	}
 
-	/* No userspace support. */
-	dm->dc->debug.disable_tri_buf = true;
-
 	return 0;
 fail:
 	kfree(aencoder);

drivers/gpu/drm/amd/display/dc/core/dc.c

@@ -2415,8 +2415,7 @@ static void commit_planes_for_stream(struct dc *dc,
 				plane_state->triplebuffer_flips = false;
 				if (update_type == UPDATE_TYPE_FAST &&
 					dc->hwss.program_triplebuffer != NULL &&
-					!plane_state->flip_immediate &&
-					!dc->debug.disable_tri_buf) {
+					!plane_state->flip_immediate && dc->debug.enable_tri_buf) {
 						/*triple buffer for VUpdate  only*/
 						plane_state->triplebuffer_flips = true;
 				}
@@ -2443,8 +2442,7 @@ static void commit_planes_for_stream(struct dc *dc,
 
 			ASSERT(!pipe_ctx->plane_state->triplebuffer_flips);
 
-			if (dc->hwss.program_triplebuffer != NULL &&
-				!dc->debug.disable_tri_buf) {
+			if (dc->hwss.program_triplebuffer != NULL && dc->debug.enable_tri_buf) {
 				/*turn off triple buffer for full update*/
 				dc->hwss.program_triplebuffer(
 					dc, pipe_ctx, pipe_ctx->plane_state->triplebuffer_flips);
@@ -2509,8 +2507,7 @@ static void commit_planes_for_stream(struct dc *dc,
 				if (pipe_ctx->plane_state != plane_state)
 					continue;
 				/*program triple buffer after lock based on flip type*/
-				if (dc->hwss.program_triplebuffer != NULL &&
-					!dc->debug.disable_tri_buf) {
+				if (dc->hwss.program_triplebuffer != NULL && dc->debug.enable_tri_buf) {
 					/*only enable triplebuffer for  fast_update*/
 					dc->hwss.program_triplebuffer(
 						dc, pipe_ctx, plane_state->triplebuffer_flips);

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

@@ -476,7 +476,7 @@ struct dc_debug_options {
 	unsigned int force_odm_combine_4to1; //bit vector based on otg inst
 #endif
 	unsigned int force_fclk_khz;
-	bool disable_tri_buf;
+	bool enable_tri_buf;
 	bool dmub_offload_enabled;
 	bool dmcub_emulation;
 #if defined(CONFIG_DRM_AMD_DC_DCN3_0)

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c

@@ -1642,16 +1642,15 @@ void dcn20_program_front_end_for_ctx(
 	struct dce_hwseq *hws = dc->hwseq;
 	DC_LOGGER_INIT(dc->ctx->logger);
 
-	for (i = 0; i < dc->res_pool->pipe_count; i++) {
-		struct pipe_ctx *pipe_ctx = &context->res_ctx.pipe_ctx[i];
+	if (dc->hwss.program_triplebuffer != NULL && dc->debug.enable_tri_buf) {
+		for (i = 0; i < dc->res_pool->pipe_count; i++) {
+			struct pipe_ctx *pipe_ctx = &context->res_ctx.pipe_ctx[i];
 
-		if (!pipe_ctx->top_pipe && !pipe_ctx->prev_odm_pipe && pipe_ctx->plane_state) {
-			ASSERT(!pipe_ctx->plane_state->triplebuffer_flips);
-			if (dc->hwss.program_triplebuffer != NULL &&
-				!dc->debug.disable_tri_buf) {
+			if (!pipe_ctx->top_pipe && !pipe_ctx->prev_odm_pipe && pipe_ctx->plane_state) {
+				ASSERT(!pipe_ctx->plane_state->triplebuffer_flips);
 				/*turn off triple buffer for full update*/
 				dc->hwss.program_triplebuffer(
-					dc, pipe_ctx, pipe_ctx->plane_state->triplebuffer_flips);
+						dc, pipe_ctx, pipe_ctx->plane_state->triplebuffer_flips);
 			}
 		}
 	}

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c

@@ -1075,7 +1075,6 @@ static const struct dc_debug_options debug_defaults_drv = {
 		.disable_pplib_wm_range = false,
 		.scl_reset_length10 = true,
 		.sanity_checks = false,
-		.disable_tri_buf = true,
 		.underflow_assert_delay_us = 0xFFFFFFFF,
 };
 
@@ -1092,6 +1091,7 @@ static const struct dc_debug_options debug_defaults_diags = {
 		.disable_stutter = true,
 		.scl_reset_length10 = true,
 		.underflow_assert_delay_us = 0xFFFFFFFF,
+		.enable_tri_buf = true,
 };
 
 void dcn20_dpp_destroy(struct dpp **dpp)

drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c

@@ -894,6 +894,8 @@ static const struct dc_debug_options debug_defaults_diags = {
 		.disable_pplib_wm_range = true,
 		.disable_stutter = true,
 		.disable_48mhz_pwrdwn = true,
+		.disable_psr = true,
+		.enable_tri_buf = true
 };
 
 enum dcn20_clk_src_array_id {

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c

@@ -865,6 +865,7 @@ static const struct dc_debug_options debug_defaults_diags = {
 	.scl_reset_length10 = true,
 	.dwb_fi_phase = -1, // -1 = disable
 	.dmub_command_table = true,
+	.enable_tri_buf = true,
 };
 
 void dcn30_dpp_destroy(struct dpp **dpp)