[PATCH 07/40] drm/amd/display: Change DET policy for MPO cases

[Rodrigo Siqueira]

From: Alvin Lee <Alvin.Lee2 at amd.com>

For MPO we want to allocate less than maximum DET for MPO pipes because
we need enogh buffer to move DET back to toher 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 at amd.com>
---
 .../drm/amd/display/dc/dcn32/dcn32_resource.c | 34 ++++++++++++-------
 .../drm/amd/display/dc/dml/display_mode_vba.c |  2 +-
 2 files changed, 22 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c
index 468c18acfcdc..63227c55a2f0 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c
+++ b/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++) {
 
diff --git a/drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.c b/drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.c
index 74e17f5da8dc..5185c2ccdfd5 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.c
+++ b/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;
-- 
2.25.1