diff options
| author | David Francis <[email protected]> | 2019-06-06 11:20:10 -0400 |
|---|---|---|
| committer | Alex Deucher <[email protected]> | 2020-01-09 18:07:46 -0500 |
| commit | a3c2b0ffc007e5d98f5313ed951fff092535fb6d (patch) | |
| tree | e6c14ad092c1152e57e70218074aab311db455ad | |
| parent | dc48529fb14ee8450705c00d91f4dcc155e1c2cb (diff) | |
drm/dp_mst: Parse FEC capability on MST ports
As of DP1.4, ENUM_PATH_RESOURCES returns a bit indicating
if FEC can be supported up to that point in the MST network.
The bit is the first byte of the ENUM_PATH_RESOURCES ack reply,
bottom-most bit (refer to section 2.11.9.4 of DP standard,
v1.4)
That value is needed for FEC and DSC support
Store it on drm_dp_mst_port
Reviewed-by: Lyude Paul <[email protected]>
Reviewed-by: Harry Wentland <[email protected]>
Signed-off-by: David Francis <[email protected]>
Signed-off-by: Mikita Lipski <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
| -rw-r--r-- | drivers/gpu/drm/drm_dp_mst_topology.c | 2 | ||||
| -rw-r--r-- | include/drm/drm_dp_mst_helper.h | 3 |
2 files changed, 5 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 2443532341d0..77d95e2de897 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -853,6 +853,7 @@ static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband { int idx = 1; repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf; + repmsg->u.path_resources.fec_capable = raw->msg[idx] & 0x1; idx++; if (idx > raw->curlen) goto fail_len; @@ -2951,6 +2952,7 @@ drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, path_res->avail_payload_bw_number); port->available_pbn = path_res->avail_payload_bw_number; + port->fec_capable = path_res->fec_capable; } } diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h index 0c59c9a348bd..f4b8bc027553 100644 --- a/include/drm/drm_dp_mst_helper.h +++ b/include/drm/drm_dp_mst_helper.h @@ -156,6 +156,8 @@ struct drm_dp_mst_port { * audio-capable. */ bool has_audio; + + bool fec_capable; }; /** @@ -383,6 +385,7 @@ struct drm_dp_port_number_req { struct drm_dp_enum_path_resources_ack_reply { u8 port_number; + bool fec_capable; u16 full_payload_bw_number; u16 avail_payload_bw_number; }; |