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drm: Update MST First Link Slot Information Based on Encoding Format

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8b/10b encoding format requires to reserve the first slot for
recording metadata. Real data transmission starts from the second slot,
with a total of available 63 slots available.

In 128b/132b encoding format, metadata is transmitted separately
in LLCP packet before MTP. Real data transmission starts from
the first slot, with a total of 64 slots available.

v2:
* Move total/start slots to mst_state, and copy it to mst_mgr in
atomic_check

v3:
* Only keep the slot info on the mst_state
* add a start_slot parameter to the payload function, to facilitate non
  atomic drivers (this is a temporary workaround and should be removed when
  we are moving out the non atomic driver helpers)

v4:
*fixed typo and formatting

v5: (no functional changes)
* Fixed formatting in drm_dp_mst_update_slots()
* Reference mst_state instead of mst_state->mgr for debugging info

Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Fangzhi Zuo <Jerry.Zuo@amd.com>
[v5 nitpicks]
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211025223825.301703-3-lyude@redhat.com
This commit is contained in:
Bhawanpreet Lakha
2021-10-25 18:38:22 -04:00
committed by Lyude Paul
parent 0332078398
commit d6c6a76f80
6 changed files with 42 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/gpu/drm/radeon/radeon_dp_mst.c
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@@ -423,7 +423,7 @@ radeon_mst_encoder_dpms(struct drm_encoder *encoder, int mode)
drm_dp_mst_allocate_vcpi(&radeon_connector->mst_port->mst_mgr,
radeon_connector->port,
mst_enc->pbn, slots);
drm_dp_update_payload_part1(&radeon_connector->mst_port->mst_mgr);
drm_dp_update_payload_part1(&radeon_connector->mst_port->mst_mgr, 1);
radeon_dp_mst_set_be_cntl(primary, mst_enc,
radeon_connector->mst_port->hpd.hpd, true);
@@ -452,7 +452,7 @@ radeon_mst_encoder_dpms(struct drm_encoder *encoder, int mode)
return;
drm_dp_mst_reset_vcpi_slots(&radeon_connector->mst_port->mst_mgr, mst_enc->port);
drm_dp_update_payload_part1(&radeon_connector->mst_port->mst_mgr);
drm_dp_update_payload_part1(&radeon_connector->mst_port->mst_mgr, 1);
drm_dp_check_act_status(&radeon_connector->mst_port->mst_mgr);
/* and this can also fail */