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| author | Alvin Lee <Alvin.Lee2@amd.com> | 2022-10-30 22:56:53 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2022-11-10 01:41:41 +0300 |
| commit | 964d641632fa0c8eb52d577c23c1b5b5525a9bc7 (patch) | |
| tree | 237cf7510f09d4515e7532e81a2a1b29a912337d /drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c | |
| parent | 52b5432cd70a2d6d998cb9b48378c37d5bb31e12 (diff) | |
| download | linux-964d641632fa0c8eb52d577c23c1b5b5525a9bc7.tar.xz | |
drm/amd/display: Add margin for max vblank time for SubVP + DRR
[Description]
- Incorporate FW delays as port of max VTOTAL calculated for
SubVP + DRR cases (since it is part of the microschedule).
- Also add margin for the max VTOTAL possible for SubVP + DRR cases.
- Due to rounding errors in FW (integer arithmetic), the microschedule
calculation can get pushed to the next frame (incorrectly) in cases
where we use the max VTOTAL possible to complete the MCLK switch.
- When the rounding error occurs, we are only off by 1-2 lines,
use 40us margin which is working consistently.
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Alan Liu <HaoPing.Liu@amd.com>
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>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c index 4cb912bf400b..097556f7b32c 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c +++ b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c @@ -477,12 +477,20 @@ static void populate_subvp_cmd_drr_info(struct dc *dc, (((uint64_t)main_timing->pix_clk_100hz * 100))); drr_active_us = div64_u64(((uint64_t)drr_timing->v_addressable * drr_timing->h_total * 1000000), (((uint64_t)drr_timing->pix_clk_100hz * 100))); - max_drr_vblank_us = div64_u64((subvp_active_us - prefetch_us - drr_active_us), 2) + drr_active_us; - max_drr_mallregion_us = subvp_active_us - prefetch_us - mall_region_us; + max_drr_vblank_us = div64_u64((subvp_active_us - prefetch_us - + dc->caps.subvp_fw_processing_delay_us - drr_active_us), 2) + drr_active_us; + max_drr_mallregion_us = subvp_active_us - prefetch_us - mall_region_us - dc->caps.subvp_fw_processing_delay_us; max_drr_supported_us = max_drr_vblank_us > max_drr_mallregion_us ? max_drr_vblank_us : max_drr_mallregion_us; max_vtotal_supported = div64_u64(((uint64_t)drr_timing->pix_clk_100hz * 100 * max_drr_supported_us), (((uint64_t)drr_timing->h_total * 1000000))); + /* When calculating the max vtotal supported for SubVP + DRR cases, add + * margin due to possible rounding errors (being off by 1 line in the + * FW calculation can incorrectly push the P-State switch to wait 1 frame + * longer). + */ + max_vtotal_supported = max_vtotal_supported - dc->caps.subvp_drr_max_vblank_margin_us; + pipe_data->pipe_config.vblank_data.drr_info.min_vtotal_supported = min_vtotal_supported; pipe_data->pipe_config.vblank_data.drr_info.max_vtotal_supported = max_vtotal_supported; } |