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
Signed-off-by: David Francis <david.fran...@amd.com>
Reviewed-by: Lyude Paul <ly...@redhat.com>
---
drivers/gpu/drm/drm_dp_mst_topology.c | 2 ++
include/drm/drm_dp_mst_helper.h | 3 +++
2 files changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c
b/drivers/gpu/drm/drm_dp_mst_topology.c
index 8e2e731c35c5..50a044718439 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -553,6 +553,7 @@ 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;
@@ -2183,6 +2184,7 @@ static int drm_dp_send_enum_path_resources(struct
drm_dp_mst_topology_mgr *mgr,
DRM_DEBUG_KMS("enum path resources %d: %d %d\n",
txmsg->reply.u.path_resources.port_number,
txmsg->reply.u.path_resources.full_payload_bw_number,
txmsg->reply.u.path_resources.avail_payload_bw_number);
port->available_pbn =
txmsg->reply.u.path_resources.avail_payload_bw_number;
+ port->fec_capable =
txmsg->reply.u.path_resources.fec_capable;
}
}
diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h
index ddb518f2157a..fa973773a4a7 100644
--- a/include/drm/drm_dp_mst_helper.h
+++ b/include/drm/drm_dp_mst_helper.h
@@ -108,6 +108,8 @@ struct drm_dp_mst_port {
* audio-capable.
*/
bool has_audio;
+
+ bool fec_capable;
};
/**
@@ -312,6 +314,7 @@ 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;
};
--
2.17.1
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