drm/amd/display: Change DET policy for MPO cases

For MPO we want to allocate less than maximum DET for MPO pipes because
we need enogh buffer to move DET back to other pipes when removing an
MPO plane. Also update regular DET allocation to use DET override (DCN32
has an internal policy which driver does not want to use)
Signed-off-by: Alvin Lee <Alvin.Lee2@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c

@@ -3045,31 +3045,35 @@ int dcn32_populate_dml_pipes_from_context(
 		pipe_cnt++;
 	}
 
+	/* For DET allocation, we don't want to use DML policy (not optimal for utilizing all
+	 * the DET available for each pipe). Use the DET override input to maintain our driver
+	 * policy.
+	 */
 	switch (pipe_cnt) {
 	case 1:
-		context->bw_ctx.dml.ip.det_buffer_size_kbytes = DCN3_2_MAX_DET_SIZE;
+		pipes[0].pipe.src.det_size_override = DCN3_2_MAX_DET_SIZE;
 		if (pipe->plane_state && !dc->debug.disable_z9_mpc) {
 			if (!is_dual_plane(pipe->plane_state->format)) {
-				context->bw_ctx.dml.ip.det_buffer_size_kbytes = DCN3_2_DEFAULT_DET_SIZE;
+				pipes[0].pipe.src.det_size_override = DCN3_2_DEFAULT_DET_SIZE;
 				pipes[0].pipe.src.unbounded_req_mode = true;
 				if (pipe->plane_state->src_rect.width >= 5120 &&
 					pipe->plane_state->src_rect.height >= 2880)
-					context->bw_ctx.dml.ip.det_buffer_size_kbytes = 320; // 5K or higher
+					pipes[0].pipe.src.det_size_override = 320; // 5K or higher
 			}
 		}
 		break;
 	case 2:
-		context->bw_ctx.dml.ip.det_buffer_size_kbytes = DCN3_2_MAX_DET_SIZE / 2; // 576 KB (9 segments)
-		break;
 	case 3:
-		context->bw_ctx.dml.ip.det_buffer_size_kbytes = DCN3_2_MAX_DET_SIZE / 3; // 384 KB (6 segments)
-		break;
 	case 4:
-	default:
-		context->bw_ctx.dml.ip.det_buffer_size_kbytes = DCN3_2_DEFAULT_DET_SIZE; // 256 KB (4 segments)
+		// For 2 and 3 pipes, use (MAX_DET_SIZE / pipe_cnt), for 4 pipes use default size for each pipe
+		for (i = 0; i < pipe_cnt; i++) {
+			pipes[i].pipe.src.det_size_override = (pipe_cnt < 4) ? (DCN3_2_MAX_DET_SIZE / pipe_cnt) : DCN3_2_DEFAULT_DET_SIZE;
+		}
 		break;
 	}
 
+	dcn32_update_det_override_for_mpo(dc, context, pipes);
+
 	return pipe_cnt;
 }
 
@@ -3365,8 +3369,8 @@ void dcn32_calculate_dlg_params(struct dc *dc, struct dc_state *context, display
 			context->res_ctx.pipe_ctx[i].det_buffer_size_kb = 0;
 			context->res_ctx.pipe_ctx[i].unbounded_req = false;
 		} else {
-			context->res_ctx.pipe_ctx[i].det_buffer_size_kb =
-					context->bw_ctx.dml.ip.det_buffer_size_kbytes;
+			context->res_ctx.pipe_ctx[i].det_buffer_size_kb = get_det_buffer_size_kbytes(&context->bw_ctx.dml, pipes, pipe_cnt,
+							pipe_idx);
 			context->res_ctx.pipe_ctx[i].unbounded_req = pipes[pipe_idx].pipe.src.unbounded_req_mode;
 		}
 		if (context->bw_ctx.bw.dcn.clk.dppclk_khz < pipes[pipe_idx].clks_cfg.dppclk_mhz * 1000)
@@ -3383,8 +3387,12 @@ void dcn32_calculate_dlg_params(struct dc *dc, struct dc_state *context, display
 	context->bw_ctx.bw.dcn.clk.max_supported_dispclk_khz = context->bw_ctx.dml.soc.clock_limits[vlevel].dispclk_mhz
 			* 1000;
 
-	context->bw_ctx.bw.dcn.compbuf_size_kb = context->bw_ctx.dml.ip.config_return_buffer_size_in_kbytes
-			- context->bw_ctx.dml.ip.det_buffer_size_kbytes * pipe_idx;
+	context->bw_ctx.bw.dcn.compbuf_size_kb = context->bw_ctx.dml.ip.config_return_buffer_size_in_kbytes;
+
+	for (i = 0; i < dc->res_pool->pipe_count; i++) {
+		if (context->res_ctx.pipe_ctx[i].stream)
+			context->bw_ctx.bw.dcn.compbuf_size_kb -= context->res_ctx.pipe_ctx[i].det_buffer_size_kb;
+	}
 
 	for (i = 0, pipe_idx = 0; i < dc->res_pool->pipe_count; i++) {
 

drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.c

@@ -561,8 +561,8 @@ static void fetch_pipe_params(struct display_mode_lib *mode_lib)
 		mode_lib->vba.GPUVMMinPageSizeKBytes[mode_lib->vba.NumberOfActivePlanes] = src->gpuvm_min_page_size_kbytes;
 		mode_lib->vba.RefreshRate[mode_lib->vba.NumberOfActivePlanes] = dst->refresh_rate; //todo remove this
 		mode_lib->vba.OutputLinkDPRate[mode_lib->vba.NumberOfActivePlanes] = dout->dp_rate;
-
 		mode_lib->vba.ODMUse[mode_lib->vba.NumberOfActivePlanes] = dst->odm_combine_policy;
+		mode_lib->vba.DETSizeOverride[mode_lib->vba.NumberOfActivePlanes] = src->det_size_override;
 		//TODO: Need to assign correct values to dp_multistream vars
 		mode_lib->vba.OutputMultistreamEn[mode_lib->vba.NumberOfActiveSurfaces] = dout->dp_multistream_en;
 		mode_lib->vba.OutputMultistreamId[mode_lib->vba.NumberOfActiveSurfaces] = dout->dp_multistream_id;