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Date: Tue, 25 May 2021 10:59:55 +1000
From: Sam McNally <sammc@...omium.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Lyude Paul <lyude@...hat.com>, Hans Verkuil <hverkuil@...all.nl>,
Sam McNally <sammc@...omium.org>,
Anshuman Gupta <anshuman.gupta@...el.com>,
Daniel Vetter <daniel@...ll.ch>,
David Airlie <airlied@...ux.ie>,
Lee Jones <lee.jones@...aro.org>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Sean Paul <seanpaul@...omium.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
dri-devel@...ts.freedesktop.org
Subject: [PATCH v5 2/3] drm/dp_mst: Add support for sink event notify messages
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@...omium.org>
---
(no changes since v4)
Changes in v4:
- Changed logging to use drm_dbg_kms()
- Added self-test
drivers/gpu/drm/drm_dp_mst_topology.c | 57 ++++++++++++++++++-
.../drm/selftests/test-drm_dp_mst_helper.c | 8 +++
include/drm/drm_dp_mst_helper.h | 14 +++++
3 files changed, 78 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index 573f39a3dc16..29aad3b6b31a 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -473,6 +473,20 @@ drm_dp_encode_sideband_req(const struct drm_dp_sideband_msg_req_body *req,
idx++;
break;
}
+ case DP_SINK_EVENT_NOTIFY: {
+ const struct drm_dp_sink_event_notify *msg;
+
+ msg = &req->u.sink_event;
+ buf[idx] = (msg->port_number & 0xf) << 4;
+ idx++;
+ memcpy(&raw->msg[idx], msg->guid, 16);
+ idx += 16;
+ buf[idx] = (msg->event_id & 0xff00) >> 8;
+ idx++;
+ buf[idx] = (msg->event_id & 0xff);
+ idx++;
+ break;
+ }
}
raw->cur_len = idx;
}
@@ -719,6 +733,12 @@ drm_dp_dump_sideband_msg_req_body(const struct drm_dp_sideband_msg_req_body *req
(int)ARRAY_SIZE(req->u.resource_stat.guid), req->u.resource_stat.guid,
req->u.resource_stat.available_pbn);
break;
+ case DP_SINK_EVENT_NOTIFY:
+ P("port=%d guid=%*ph event=%d",
+ req->u.sink_event.port_number,
+ (int)ARRAY_SIZE(req->u.sink_event.guid), req->u.sink_event.guid,
+ req->u.sink_event.event_id);
+ break;
default:
P("???\n");
break;
@@ -1163,6 +1183,30 @@ static bool drm_dp_sideband_parse_resource_status_notify(const struct drm_dp_mst
return false;
}
+static bool drm_dp_sideband_parse_sink_event_notify(const struct drm_dp_mst_topology_mgr *mgr,
+ 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_dbg_kms(mgr->dev, "sink event notify parse length fail %d %d\n", idx, raw->curlen);
+ return false;
+}
+
bool drm_dp_sideband_parse_req(const struct drm_dp_mst_topology_mgr *mgr,
struct drm_dp_sideband_msg_rx *raw,
struct drm_dp_sideband_msg_req_body *msg)
@@ -1175,6 +1219,8 @@ bool drm_dp_sideband_parse_req(const struct drm_dp_mst_topology_mgr *mgr,
return drm_dp_sideband_parse_connection_status_notify(mgr, raw, msg);
case DP_RESOURCE_STATUS_NOTIFY:
return drm_dp_sideband_parse_resource_status_notify(mgr, raw, msg);
+ case DP_SINK_EVENT_NOTIFY:
+ return drm_dp_sideband_parse_sink_event_notify(mgr, raw, msg);
default:
drm_err(mgr->dev, "Got unknown request 0x%02x (%s)\n",
msg->req_type, drm_dp_mst_req_type_str(msg->req_type));
@@ -4106,6 +4152,8 @@ 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);
@@ -4177,7 +4225,8 @@ static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
drm_dp_sideband_parse_req(mgr, &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_dbg_kms(mgr->dev, "Received unknown up req type, ignoring: %x\n",
up_req->msg.req_type);
kfree(up_req);
@@ -4205,6 +4254,12 @@ static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
drm_dbg_kms(mgr->dev, "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_dbg_kms(mgr->dev, "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/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c b/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c
index 7bbeb1e5bc97..d49c10d52d88 100644
--- a/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c
+++ b/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c
@@ -164,6 +164,7 @@ sideband_msg_req_encode_decode(struct drm_dp_sideband_msg_req_body *in)
switch (in->req_type) {
case DP_CONNECTION_STATUS_NOTIFY:
case DP_RESOURCE_STATUS_NOTIFY:
+ case DP_SINK_EVENT_NOTIFY:
memcpy(&rxmsg->msg, txmsg->msg, ARRAY_SIZE(rxmsg->msg));
rxmsg->curlen = txmsg->cur_len;
if (!drm_dp_sideband_parse_req(mgr, rxmsg, out)) {
@@ -387,10 +388,17 @@ int igt_dp_mst_sideband_msg_req_decode(void *unused)
in.u.resource_stat.available_pbn = 0xcdef;
DO_TEST();
+ in.req_type = DP_SINK_EVENT_NOTIFY;
+ in.u.sink_event.port_number = 0xf;
+ get_random_bytes(in.u.sink_event.guid, sizeof(in.u.sink_event.guid));
+ in.u.sink_event.event_id = 0xcdef;
+ DO_TEST();
+
#undef DO_TEST
#define DO_TEST(req_type) FAIL_ON(!sideband_msg_req_parse(req_type))
DO_TEST(DP_CONNECTION_STATUS_NOTIFY);
DO_TEST(DP_RESOURCE_STATUS_NOTIFY);
+ DO_TEST(DP_SINK_EVENT_NOTIFY);
DO_TEST(DP_REMOTE_I2C_WRITE);
#undef DO_TEST
diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h
index c87a829b6498..96c87f761129 100644
--- a/include/drm/drm_dp_mst_helper.h
+++ b/include/drm/drm_dp_mst_helper.h
@@ -439,6 +439,19 @@ 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;
@@ -450,6 +463,7 @@ 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;
--
2.31.1.818.g46aad6cb9e-goog
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