On Wed, 2020-09-23 at 12:13 +1000, Sam McNally wrote:
> Sink event notify messages are used for MST CEC IRQs. Add parsing
> support for sink event notify messages in preparation for handling MST
> CEC IRQs.
>
> Signed-off-by: Sam McNally <sammc@xxxxxxxxxxxx>
> ---
>
> (no changes since v1)
>
> drivers/gpu/drm/drm_dp_mst_topology.c | 37 ++++++++++++++++++++++++++-
> include/drm/drm_dp_mst_helper.h | 14 ++++++++++
> 2 files changed, 50 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c
> b/drivers/gpu/drm/drm_dp_mst_topology.c
> index 17dbed0a9800..15b6cc39a754 100644
> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> @@ -1027,6 +1027,30 @@ static bool
> drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_
> return false;
> }
>
> +static bool drm_dp_sideband_parse_sink_event_notify(
> + struct drm_dp_sideband_msg_rx *raw,
> + struct drm_dp_sideband_msg_req_body *msg)
> +{
> + int idx = 1;
> +
> + msg->u.sink_event.port_number = (raw->msg[idx] & 0xf0) >> 4;
> + idx++;
> + if (idx > raw->curlen)
> + goto fail_len;
> +
> + memcpy(msg->u.sink_event.guid, &raw->msg[idx], 16);
> + idx += 16;
> + if (idx > raw->curlen)
> + goto fail_len;
> +
> + msg->u.sink_event.event_id = (raw->msg[idx] << 8) | (raw->msg[idx +
> 1]);
> + idx++;
> + return true;
> +fail_len:
> + DRM_DEBUG_KMS("sink event notify parse length fail %d %d\n", idx, raw-
> >curlen);
Is it possible for us to use drm_dbg_kms() here?
Also-there is an MST selftest you should update for this
> + return false;
> +}
> +
> static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw,
> struct drm_dp_sideband_msg_req_body
> *msg)
> {
> @@ -1038,6 +1062,8 @@ static bool drm_dp_sideband_parse_req(struct
> drm_dp_sideband_msg_rx *raw,
> return drm_dp_sideband_parse_connection_status_notify(raw,
> msg);
> case DP_RESOURCE_STATUS_NOTIFY:
> return drm_dp_sideband_parse_resource_status_notify(raw, msg);
> + case DP_SINK_EVENT_NOTIFY:
> + return drm_dp_sideband_parse_sink_event_notify(raw, msg);
> default:
> DRM_ERROR("Got unknown request 0x%02x (%s)\n", msg->req_type,
> drm_dp_mst_req_type_str(msg->req_type));
> @@ -3875,6 +3901,8 @@ drm_dp_mst_process_up_req(struct drm_dp_mst_topology_mgr
> *mgr,
> guid = msg->u.conn_stat.guid;
> else if (msg->req_type == DP_RESOURCE_STATUS_NOTIFY)
> guid = msg->u.resource_stat.guid;
> + else if (msg->req_type == DP_SINK_EVENT_NOTIFY)
> + guid = msg->u.sink_event.guid;
>
> if (guid)
> mstb = drm_dp_get_mst_branch_device_by_guid(mgr,
> guid);
> @@ -3948,7 +3976,8 @@ static int drm_dp_mst_handle_up_req(struct
> drm_dp_mst_topology_mgr *mgr)
> drm_dp_sideband_parse_req(&mgr->up_req_recv, &up_req->msg);
>
> if (up_req->msg.req_type != DP_CONNECTION_STATUS_NOTIFY &&
> - up_req->msg.req_type != DP_RESOURCE_STATUS_NOTIFY) {
> + up_req->msg.req_type != DP_RESOURCE_STATUS_NOTIFY &&
> + up_req->msg.req_type != DP_SINK_EVENT_NOTIFY) {
> DRM_DEBUG_KMS("Received unknown up req type, ignoring: %x\n",
> up_req->msg.req_type);
> kfree(up_req);
> @@ -3976,6 +4005,12 @@ static int drm_dp_mst_handle_up_req(struct
> drm_dp_mst_topology_mgr *mgr)
> DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n",
> res_stat->port_number,
> res_stat->available_pbn);
> + } else if (up_req->msg.req_type == DP_SINK_EVENT_NOTIFY) {
> + const struct drm_dp_sink_event_notify *sink_event =
> + &up_req->msg.u.sink_event;
> +
> + DRM_DEBUG_KMS("Got SEN: pn: %d event_id %d\n",
> + sink_event->port_number, sink_event->event_id);
> }
>
> up_req->hdr = mgr->up_req_recv.initial_hdr;
> diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h
> index 6ae5860d8644..c7c79e0ced18 100644
> --- a/include/drm/drm_dp_mst_helper.h
> +++ b/include/drm/drm_dp_mst_helper.h
> @@ -402,6 +402,19 @@ struct drm_dp_resource_status_notify {
> u16 available_pbn;
> };
>
> +#define DP_SINK_EVENT_PANEL_REPLAY_ACTIVE_FRAME_CRC_ERROR BIT(0)
> +#define DP_SINK_EVENT_PANEL_REPLAY_RFB_STORAGE_ERROR BIT(1)
> +#define DP_SINK_EVENT_DSC_RC_BUFFER_UNDER_RUN BIT(2)
> +#define DP_SINK_EVENT_DSC_RC_BUFFER_OVERFLOW BIT(3)
> +#define DP_SINK_EVENT_DSC_CHUNK_LENGTH_ERROR BIT(4)
> +#define DP_SINK_EVENT_CEC_IRQ_EVENT BIT(5)
> +
> +struct drm_dp_sink_event_notify {
> + u8 port_number;
> + u8 guid[16];
> + u16 event_id;
> +};
> +
> struct drm_dp_query_payload_ack_reply {
> u8 port_number;
> u16 allocated_pbn;
> @@ -413,6 +426,7 @@ struct drm_dp_sideband_msg_req_body {
> struct drm_dp_connection_status_notify conn_stat;
> struct drm_dp_port_number_req port_num;
> struct drm_dp_resource_status_notify resource_stat;
> + struct drm_dp_sink_event_notify sink_event;
>
> struct drm_dp_query_payload query_payload;
> struct drm_dp_allocate_payload allocate_payload;
--
Sincerely,
Lyude Paul (she/her)
Software Engineer at Red Hat
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