diff options
author | Alvin Lee <Alvin.Lee2@amd.com> | 2022-11-18 13:49:11 -0500 |
---|---|---|
committer | Alex Deucher <alexander.deucher@amd.com> | 2022-11-29 11:03:38 -0500 |
commit | fd9978aa7db9686a392be3486aa8f53ee8f86e55 (patch) | |
tree | 01fb738c84298d73a0c3183ce0af92cd3a093550 | |
parent | 6609141c49df1b86fbad26a8643d4b4044f28b11 (diff) | |
download | linux-fd9978aa7db9686a392be3486aa8f53ee8f86e55.tar.bz2 |
drm/amd/display: Don't overwrite subvp pipe info in fast updates
[Description]
- This is a workaround to avoid concurrency issues -- a fast update
creates a shallow copy of the dc current_state, and removes all
subvp/phantom related flags.
- We want to prevent the fast update thread from removing those
flags in case there's another thread running that requires
the info for proper programming
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Jasdeep Dhillon <jdhillon@amd.com>
Signed-off-by: Alvin Lee <Alvin.Lee2@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
5 files changed, 44 insertions, 30 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c index f9b8b6f6fd31..5e08922a8a66 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc.c @@ -3061,7 +3061,7 @@ static bool update_planes_and_stream_state(struct dc *dc, * Ensures that we have enough pipes for newly added MPO planes */ if (dc->res_pool->funcs->remove_phantom_pipes) - dc->res_pool->funcs->remove_phantom_pipes(dc, context); + dc->res_pool->funcs->remove_phantom_pipes(dc, context, false); /*remove old surfaces from context */ if (!dc_rem_all_planes_for_stream(dc, stream, context)) { 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 99ddd2232322..67b43e7ee0ef 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c +++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c @@ -1743,7 +1743,7 @@ void dcn32_retain_phantom_pipes(struct dc *dc, struct dc_state *context) } // return true if removed piped from ctx, false otherwise -bool dcn32_remove_phantom_pipes(struct dc *dc, struct dc_state *context) +bool dcn32_remove_phantom_pipes(struct dc *dc, struct dc_state *context, bool fast_update) { int i; bool removed_pipe = false; @@ -1770,14 +1770,23 @@ bool dcn32_remove_phantom_pipes(struct dc *dc, struct dc_state *context) removed_pipe = true; } - // Clear all phantom stream info - if (pipe->stream) { - pipe->stream->mall_stream_config.type = SUBVP_NONE; - pipe->stream->mall_stream_config.paired_stream = NULL; - } + /* For non-full updates, a shallow copy of the current state + * is created. In this case we don't want to erase the current + * state (there can be 2 HIRQL threads, one in flip, and one in + * checkMPO) that can cause a race condition. + * + * This is just a workaround, needs a proper fix. + */ + if (!fast_update) { + // Clear all phantom stream info + if (pipe->stream) { + pipe->stream->mall_stream_config.type = SUBVP_NONE; + pipe->stream->mall_stream_config.paired_stream = NULL; + } - if (pipe->plane_state) { - pipe->plane_state->is_phantom = false; + if (pipe->plane_state) { + pipe->plane_state->is_phantom = false; + } } } return removed_pipe; @@ -1950,23 +1959,28 @@ int dcn32_populate_dml_pipes_from_context( pipes[pipe_cnt].pipe.src.unbounded_req_mode = false; pipes[pipe_cnt].pipe.scale_ratio_depth.lb_depth = dm_lb_19; - switch (pipe->stream->mall_stream_config.type) { - case SUBVP_MAIN: - pipes[pipe_cnt].pipe.src.use_mall_for_pstate_change = dm_use_mall_pstate_change_sub_viewport; - subvp_in_use = true; - break; - case SUBVP_PHANTOM: - pipes[pipe_cnt].pipe.src.use_mall_for_pstate_change = dm_use_mall_pstate_change_phantom_pipe; - pipes[pipe_cnt].pipe.src.use_mall_for_static_screen = dm_use_mall_static_screen_disable; - // Disallow unbounded req for SubVP according to DCHUB programming guide - pipes[pipe_cnt].pipe.src.unbounded_req_mode = false; - break; - case SUBVP_NONE: - pipes[pipe_cnt].pipe.src.use_mall_for_pstate_change = dm_use_mall_pstate_change_disable; - pipes[pipe_cnt].pipe.src.use_mall_for_static_screen = dm_use_mall_static_screen_disable; - break; - default: - break; + /* Only populate DML input with subvp info for full updates. + * This is just a workaround -- needs a proper fix. + */ + if (!fast_validate) { + switch (pipe->stream->mall_stream_config.type) { + case SUBVP_MAIN: + pipes[pipe_cnt].pipe.src.use_mall_for_pstate_change = dm_use_mall_pstate_change_sub_viewport; + subvp_in_use = true; + break; + case SUBVP_PHANTOM: + pipes[pipe_cnt].pipe.src.use_mall_for_pstate_change = dm_use_mall_pstate_change_phantom_pipe; + pipes[pipe_cnt].pipe.src.use_mall_for_static_screen = dm_use_mall_static_screen_disable; + // Disallow unbounded req for SubVP according to DCHUB programming guide + pipes[pipe_cnt].pipe.src.unbounded_req_mode = false; + break; + case SUBVP_NONE: + pipes[pipe_cnt].pipe.src.use_mall_for_pstate_change = dm_use_mall_pstate_change_disable; + pipes[pipe_cnt].pipe.src.use_mall_for_static_screen = dm_use_mall_static_screen_disable; + break; + default: + break; + } } pipes[pipe_cnt].dout.dsc_input_bpc = 0; diff --git a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h index c50bb34b515f..d4a37f3d7999 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h +++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h @@ -81,7 +81,7 @@ bool dcn32_release_post_bldn_3dlut( struct dc_transfer_func **shaper); bool dcn32_remove_phantom_pipes(struct dc *dc, - struct dc_state *context); + struct dc_state *context, bool fast_update); void dcn32_retain_phantom_pipes(struct dc *dc, struct dc_state *context); diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c b/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c index ac324ce11597..f94abd124021 100644 --- a/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c +++ b/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c @@ -1203,7 +1203,7 @@ static void dcn32_full_validate_bw_helper(struct dc *dc, // If SubVP pipe config is unsupported (or cannot be used for UCLK switching) // remove phantom pipes and repopulate dml pipes if (!found_supported_config) { - dc->res_pool->funcs->remove_phantom_pipes(dc, context); + dc->res_pool->funcs->remove_phantom_pipes(dc, context, false); vba->DRAMClockChangeSupport[*vlevel][vba->maxMpcComb] = dm_dram_clock_change_unsupported; *pipe_cnt = dc->res_pool->funcs->populate_dml_pipes(dc, context, pipes, false); @@ -1518,7 +1518,7 @@ bool dcn32_internal_validate_bw(struct dc *dc, return false; // For each full update, remove all existing phantom pipes first - dc->res_pool->funcs->remove_phantom_pipes(dc, context); + dc->res_pool->funcs->remove_phantom_pipes(dc, context, fast_validate); dc->res_pool->funcs->update_soc_for_wm_a(dc, context); diff --git a/drivers/gpu/drm/amd/display/dc/inc/core_types.h b/drivers/gpu/drm/amd/display/dc/inc/core_types.h index aac1b3989c95..108bffb9a73a 100644 --- a/drivers/gpu/drm/amd/display/dc/inc/core_types.h +++ b/drivers/gpu/drm/amd/display/dc/inc/core_types.h @@ -240,7 +240,7 @@ struct resource_funcs { unsigned int pipe_cnt, unsigned int index); - bool (*remove_phantom_pipes)(struct dc *dc, struct dc_state *context); + bool (*remove_phantom_pipes)(struct dc *dc, struct dc_state *context, bool fast_update); void (*retain_phantom_pipes)(struct dc *dc, struct dc_state *context); void (*get_panel_config_defaults)(struct dc_panel_config *panel_config); }; |