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drm/dp_mst: Manually overwrite PBN divider for calculating timeslots

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[why]
For DSC case we cannot use topology manager's PBN divider
variable. The default divider does not take FEC into account.
Therefore the driver has to calculate its own divider based
on the link rate and lane count its handling, as it is hw specific.

[how]
Pass pbn_div as an argument, which is used if its more than
zero, otherwise default topology manager's pbn_div will be used.

Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Mikita Lipski
2019-11-14 16:24:29 -05:00
committed by Alex Deucher
parent f9c8742c66
commit 1c6c1cb5af
5 changed files with 13 additions and 6 deletions
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3
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@@ -4938,7 +4938,8 @@ static int dm_encoder_helper_atomic_check(struct drm_encoder *encoder,
dm_new_connector_state->vcpi_slots = drm_dp_atomic_find_vcpi_slots(state,
mst_mgr,
mst_port,
dm_new_connector_state->pbn);
dm_new_connector_state->pbn,
0);
if (dm_new_connector_state->vcpi_slots < 0) {
DRM_DEBUG_ATOMIC("failed finding vcpi slots: %d\n", (int)dm_new_connector_state->vcpi_slots);
return dm_new_connector_state->vcpi_slots;