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drm/dp_mst: Parse FEC capability on MST ports

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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 <lyude@redhat.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: David Francis <David.Francis@amd.com>
Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
David Francis 2019-06-06 11:20:10 -04:00 committed by Alex Deucher
parent dc48529fb1
commit a3c2b0ffc0
2 changed files with 5 additions and 0 deletions
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2
drivers/gpu/drm/drm_dp_mst_topology.c
View File

@ -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;
}
}

3
include/drm/drm_dp_mst_helper.h
View File

@ -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;
};