From b8dc6ca028d9a39196a3a066b9ef2d4a5eca475d Mon Sep 17 00:00:00 2001 From: Dillon Varone Date: Tue, 23 Jul 2024 15:54:23 -0400 Subject: [PATCH] drm/amd/display: Force enable 3DLUT DMA check for dcn401 in DML [WHY] Currently TR0 (trip 0) is not properly budgeting for urgent latency in DML2.1. This results in overly aggressive prefetch schedules that are vulnerable to request return jitter, resulting in severe underflow at the start of the frame. [HOW] Forcing 3DLUT DMA check to enable causes urgent latency to be budgeted properly into the prefetch schedule, avoiding the vulnerability. Reviewed-by: Alvin Lee Signed-off-by: Dillon Varone Signed-off-by: Wayne Lin Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher --- .../amd/display/dc/dml2/dml21/dml21_translation_helper.c | 6 ++++-- drivers/gpu/drm/amd/display/dc/dml2/dml2_wrapper.h | 1 + .../drm/amd/display/dc/resource/dcn401/dcn401_resource.c | 1 + 3 files changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/amd/display/dc/dml2/dml21/dml21_translation_helper.c b/drivers/gpu/drm/amd/display/dc/dml2/dml21/dml21_translation_helper.c index b0de8920f7e7..006667aa961b 100644 --- a/drivers/gpu/drm/amd/display/dc/dml2/dml21/dml21_translation_helper.c +++ b/drivers/gpu/drm/amd/display/dc/dml2/dml21/dml21_translation_helper.c @@ -816,6 +816,7 @@ static void populate_dml21_plane_config_from_plane_state(struct dml2_context *dm if (plane_state->mcm_luts.lut3d_data.lut3d_src == DC_CM2_TRANSFER_FUNC_SOURCE_VIDMEM) { plane->tdlut.setup_for_tdlut = true; + switch (plane_state->mcm_luts.lut3d_data.gpu_mem_params.layout) { case DC_CM2_GPU_MEM_LAYOUT_3D_SWIZZLE_LINEAR_RGB: case DC_CM2_GPU_MEM_LAYOUT_3D_SWIZZLE_LINEAR_BGR: @@ -825,6 +826,7 @@ static void populate_dml21_plane_config_from_plane_state(struct dml2_context *dm plane->tdlut.tdlut_addressing_mode = dml2_tdlut_simple_linear; break; } + switch (plane_state->mcm_luts.lut3d_data.gpu_mem_params.size) { case DC_CM2_GPU_MEM_SIZE_171717: plane->tdlut.tdlut_width_mode = dml2_tdlut_width_17_cube; @@ -833,8 +835,8 @@ static void populate_dml21_plane_config_from_plane_state(struct dml2_context *dm //plane->tdlut.tdlut_width_mode = dml2_tdlut_width_flatten; // dml2_tdlut_width_flatten undefined break; } - } else - plane->tdlut.setup_for_tdlut = false; + } + plane->tdlut.setup_for_tdlut |= dml_ctx->config.force_tdlut_enable; plane->dynamic_meta_data.enable = false; plane->dynamic_meta_data.lines_before_active_required = 0; diff --git a/drivers/gpu/drm/amd/display/dc/dml2/dml2_wrapper.h b/drivers/gpu/drm/amd/display/dc/dml2/dml2_wrapper.h index 023325e8f6e2..0f944fcfd5a5 100644 --- a/drivers/gpu/drm/amd/display/dc/dml2/dml2_wrapper.h +++ b/drivers/gpu/drm/amd/display/dc/dml2/dml2_wrapper.h @@ -236,6 +236,7 @@ struct dml2_configuration_options { bool use_clock_dc_limits; bool gpuvm_enable; + bool force_tdlut_enable; struct dml2_soc_bb *bb_from_dmub; }; diff --git a/drivers/gpu/drm/amd/display/dc/resource/dcn401/dcn401_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dcn401/dcn401_resource.c index 3e76732ac0dc..ec676d269d33 100644 --- a/drivers/gpu/drm/amd/display/dc/resource/dcn401/dcn401_resource.c +++ b/drivers/gpu/drm/amd/display/dc/resource/dcn401/dcn401_resource.c @@ -2099,6 +2099,7 @@ static bool dcn401_resource_construct( dc->dml2_options.use_native_soc_bb_construction = true; dc->dml2_options.minimize_dispclk_using_odm = true; dc->dml2_options.map_dc_pipes_with_callbacks = true; + dc->dml2_options.force_tdlut_enable = true; resource_init_common_dml2_callbacks(dc, &dc->dml2_options); dc->dml2_options.callbacks.can_support_mclk_switch_using_fw_based_vblank_stretch = &dcn30_can_support_mclk_switch_using_fw_based_vblank_stretch; -- 2.20.1