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* [PATCH v7 1/3] drm/dp_mst: Add self-tests for up requests
@ 2021-06-28  9:17 Sam McNally
  2021-06-28  9:17 ` [PATCH v7 2/3] drm/dp_mst: Add support for sink event notify messages Sam McNally
  2021-06-28  9:17 ` [PATCH v7 3/3] drm_dp_cec: add MST support Sam McNally
  0 siblings, 2 replies; 3+ messages in thread
From: Sam McNally @ 2021-06-28  9:17 UTC (permalink / raw)
  To: LKML
  Cc: Lyude Paul, Hans Verkuil, Sam McNally, Daniel Vetter,
	David Airlie, Lee Jones, Maarten Lankhorst, Maxime Ripard,
	Sean Paul, Thomas Zimmermann, dri-devel

Up requests are decoded by drm_dp_sideband_parse_req(), which operates
on a drm_dp_sideband_msg_rx, unlike down requests. Expand the existing
self-test helper sideband_msg_req_encode_decode() to copy the message
contents and length from a drm_dp_sideband_msg_tx to
drm_dp_sideband_msg_rx and use the parse function under test in place of
decode. Add an additional helper for testing clearly-invalid up
messages, verifying that parse rejects them.

Add support for currently-supported up requests to
drm_dp_dump_sideband_msg_req_body(); add support to
drm_dp_encode_sideband_req() to allow encoding for the self-tests.

Add self-tests for CONNECTION_STATUS_NOTIFY and RESOURCE_STATUS_NOTIFY.

Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Sam McNally <sammc@chromium.org>
---

(no changes since v5)

Changes in v5:
- Set mock device name to more clearly attribute error/debug logging to
  the self-test, in particular for cases where failures are expected

Changes in v4:
- New in v4

 drivers/gpu/drm/drm_dp_mst_topology.c         |  54 ++++++-
 .../gpu/drm/drm_dp_mst_topology_internal.h    |   4 +
 .../drm/selftests/test-drm_dp_mst_helper.c    | 149 ++++++++++++++++--
 3 files changed, 192 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index ad0795afc21c..ee58f6517482 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -445,6 +445,37 @@ drm_dp_encode_sideband_req(const struct drm_dp_sideband_msg_req_body *req,
 		idx++;
 		}
 		break;
+	case DP_CONNECTION_STATUS_NOTIFY: {
+		const struct drm_dp_connection_status_notify *msg;
+
+		msg = &req->u.conn_stat;
+		buf[idx] = (msg->port_number & 0xf) << 4;
+		idx++;
+		memcpy(&raw->msg[idx], msg->guid, 16);
+		idx += 16;
+		raw->msg[idx] = 0;
+		raw->msg[idx] |= msg->legacy_device_plug_status ? BIT(6) : 0;
+		raw->msg[idx] |= msg->displayport_device_plug_status ? BIT(5) : 0;
+		raw->msg[idx] |= msg->message_capability_status ? BIT(4) : 0;
+		raw->msg[idx] |= msg->input_port ? BIT(3) : 0;
+		raw->msg[idx] |= FIELD_PREP(GENMASK(2, 0), msg->peer_device_type);
+		idx++;
+		break;
+	}
+	case DP_RESOURCE_STATUS_NOTIFY: {
+		const struct drm_dp_resource_status_notify *msg;
+
+		msg = &req->u.resource_stat;
+		buf[idx] = (msg->port_number & 0xf) << 4;
+		idx++;
+		memcpy(&raw->msg[idx], msg->guid, 16);
+		idx += 16;
+		buf[idx] = (msg->available_pbn & 0xff00) >> 8;
+		idx++;
+		buf[idx] = (msg->available_pbn & 0xff);
+		idx++;
+		break;
+	}
 	}
 	raw->cur_len = idx;
 }
@@ -675,6 +706,22 @@ drm_dp_dump_sideband_msg_req_body(const struct drm_dp_sideband_msg_req_body *req
 		  req->u.enc_status.stream_behavior,
 		  req->u.enc_status.valid_stream_behavior);
 		break;
+	case DP_CONNECTION_STATUS_NOTIFY:
+		P("port=%d guid=%*ph legacy=%d displayport=%d messaging=%d input=%d peer_type=%d",
+		  req->u.conn_stat.port_number,
+		  (int)ARRAY_SIZE(req->u.conn_stat.guid), req->u.conn_stat.guid,
+		  req->u.conn_stat.legacy_device_plug_status,
+		  req->u.conn_stat.displayport_device_plug_status,
+		  req->u.conn_stat.message_capability_status,
+		  req->u.conn_stat.input_port,
+		  req->u.conn_stat.peer_device_type);
+		break;
+	case DP_RESOURCE_STATUS_NOTIFY:
+		P("port=%d guid=%*ph pbn=%d",
+		  req->u.resource_stat.port_number,
+		  (int)ARRAY_SIZE(req->u.resource_stat.guid), req->u.resource_stat.guid,
+		  req->u.resource_stat.available_pbn);
+		break;
 	default:
 		P("???\n");
 		break;
@@ -1119,9 +1166,9 @@ static bool drm_dp_sideband_parse_resource_status_notify(const struct drm_dp_mst
 	return false;
 }
 
-static 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)
+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)
 {
 	memset(msg, 0, sizeof(*msg));
 	msg->req_type = (raw->msg[0] & 0x7f);
@@ -1137,6 +1184,7 @@ static bool drm_dp_sideband_parse_req(const struct drm_dp_mst_topology_mgr *mgr,
 		return false;
 	}
 }
+EXPORT_SYMBOL_FOR_TESTS_ONLY(drm_dp_sideband_parse_req);
 
 static void build_dpcd_write(struct drm_dp_sideband_msg_tx *msg,
 			     u8 port_num, u32 offset, u8 num_bytes, u8 *bytes)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology_internal.h b/drivers/gpu/drm/drm_dp_mst_topology_internal.h
index eeda9a61c657..0356a2e0dba1 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology_internal.h
+++ b/drivers/gpu/drm/drm_dp_mst_topology_internal.h
@@ -21,4 +21,8 @@ void
 drm_dp_dump_sideband_msg_req_body(const struct drm_dp_sideband_msg_req_body *req,
 				  int indent, struct drm_printer *printer);
 
+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);
 #endif /* !_DRM_DP_MST_HELPER_INTERNAL_H_ */
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 6b4759ed6bfd..7bbeb1e5bc97 100644
--- a/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c
+++ b/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c
@@ -13,6 +13,10 @@
 #include "../drm_dp_mst_topology_internal.h"
 #include "test-drm_modeset_common.h"
 
+static void mock_release(struct device *dev)
+{
+}
+
 int igt_dp_mst_calc_pbn_mode(void *ignored)
 {
 	int pbn, i;
@@ -120,27 +124,60 @@ sideband_msg_req_equal(const struct drm_dp_sideband_msg_req_body *in,
 static bool
 sideband_msg_req_encode_decode(struct drm_dp_sideband_msg_req_body *in)
 {
-	struct drm_dp_sideband_msg_req_body *out;
+	struct drm_dp_sideband_msg_req_body *out = NULL;
 	struct drm_printer p = drm_err_printer(PREFIX_STR);
-	struct drm_dp_sideband_msg_tx *txmsg;
+	struct drm_dp_sideband_msg_tx *txmsg = NULL;
+	struct drm_dp_sideband_msg_rx *rxmsg = NULL;
+	struct drm_dp_mst_topology_mgr *mgr = NULL;
 	int i, ret;
-	bool result = true;
+	bool result = false;
 
 	out = kzalloc(sizeof(*out), GFP_KERNEL);
 	if (!out)
-		return false;
+		goto out;
 
 	txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
 	if (!txmsg)
-		return false;
+		goto out;
 
-	drm_dp_encode_sideband_req(in, txmsg);
-	ret = drm_dp_decode_sideband_req(txmsg, out);
-	if (ret < 0) {
-		drm_printf(&p, "Failed to decode sideband request: %d\n",
-			   ret);
-		result = false;
+	rxmsg = kzalloc(sizeof(*rxmsg), GFP_KERNEL);
+	if (!rxmsg)
 		goto out;
+
+	mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
+	if (!mgr)
+		goto out;
+
+	mgr->dev = kzalloc(sizeof(*mgr->dev), GFP_KERNEL);
+	if (!mgr->dev)
+		goto out;
+
+	mgr->dev->dev = kzalloc(sizeof(*mgr->dev->dev), GFP_KERNEL);
+	if (!mgr->dev->dev)
+		goto out;
+
+	mgr->dev->dev->release = mock_release;
+	mgr->dev->dev->init_name = PREFIX_STR;
+	device_initialize(mgr->dev->dev);
+
+	drm_dp_encode_sideband_req(in, txmsg);
+	switch (in->req_type) {
+	case DP_CONNECTION_STATUS_NOTIFY:
+	case DP_RESOURCE_STATUS_NOTIFY:
+		memcpy(&rxmsg->msg, txmsg->msg, ARRAY_SIZE(rxmsg->msg));
+		rxmsg->curlen = txmsg->cur_len;
+		if (!drm_dp_sideband_parse_req(mgr, rxmsg, out)) {
+			drm_printf(&p, "Failed to decode sideband request\n");
+			goto out;
+		}
+		break;
+	default:
+		ret = drm_dp_decode_sideband_req(txmsg, out);
+		if (ret < 0) {
+			drm_printf(&p, "Failed to decode sideband request: %d\n", ret);
+			goto out;
+		}
+		break;
 	}
 
 	if (!sideband_msg_req_equal(in, out)) {
@@ -148,9 +185,9 @@ sideband_msg_req_encode_decode(struct drm_dp_sideband_msg_req_body *in)
 		drm_dp_dump_sideband_msg_req_body(in, 1, &p);
 		drm_printf(&p, "Got:\n");
 		drm_dp_dump_sideband_msg_req_body(out, 1, &p);
-		result = false;
 		goto out;
 	}
+	result = true;
 
 	switch (in->req_type) {
 	case DP_REMOTE_DPCD_WRITE:
@@ -171,6 +208,66 @@ sideband_msg_req_encode_decode(struct drm_dp_sideband_msg_req_body *in)
 out:
 	kfree(out);
 	kfree(txmsg);
+	kfree(rxmsg);
+	if (mgr) {
+		if (mgr->dev) {
+			put_device(mgr->dev->dev);
+			kfree(mgr->dev);
+		}
+		kfree(mgr);
+	}
+	return result;
+}
+
+static bool
+sideband_msg_req_parse(int req_type)
+{
+	struct drm_dp_sideband_msg_req_body *out = NULL;
+	struct drm_printer p = drm_err_printer(PREFIX_STR);
+	struct drm_dp_sideband_msg_rx *rxmsg = NULL;
+	struct drm_dp_mst_topology_mgr *mgr = NULL;
+	bool result = false;
+
+	out = kzalloc(sizeof(*out), GFP_KERNEL);
+	if (!out)
+		goto out;
+
+	rxmsg = kzalloc(sizeof(*rxmsg), GFP_KERNEL);
+	if (!rxmsg)
+		goto out;
+
+	mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
+	if (!mgr)
+		goto out;
+
+	mgr->dev = kzalloc(sizeof(*mgr->dev), GFP_KERNEL);
+	if (!mgr->dev)
+		goto out;
+
+	mgr->dev->dev = kzalloc(sizeof(*mgr->dev->dev), GFP_KERNEL);
+	if (!mgr->dev->dev)
+		goto out;
+
+	mgr->dev->dev->release = mock_release;
+	mgr->dev->dev->init_name = PREFIX_STR " expected parse failure";
+	device_initialize(mgr->dev->dev);
+
+	rxmsg->curlen = 1;
+	rxmsg->msg[0] = req_type & 0x7f;
+	if (drm_dp_sideband_parse_req(mgr, rxmsg, out))
+		drm_printf(&p, "Unexpectedly decoded invalid sideband request\n");
+	else
+		result = true;
+out:
+	kfree(out);
+	kfree(rxmsg);
+	if (mgr) {
+		if (mgr->dev) {
+			put_device(mgr->dev->dev);
+			kfree(mgr->dev);
+		}
+		kfree(mgr);
+	}
 	return result;
 }
 
@@ -268,6 +365,34 @@ int igt_dp_mst_sideband_msg_req_decode(void *unused)
 	in.u.enc_status.valid_stream_behavior = 1;
 	DO_TEST();
 
+	in.req_type = DP_CONNECTION_STATUS_NOTIFY;
+	in.u.conn_stat.port_number = 0xf;
+	get_random_bytes(in.u.conn_stat.guid, sizeof(in.u.conn_stat.guid));
+	in.u.conn_stat.legacy_device_plug_status = 1;
+	in.u.conn_stat.displayport_device_plug_status = 0;
+	in.u.conn_stat.message_capability_status = 0;
+	in.u.conn_stat.input_port = 0;
+	in.u.conn_stat.peer_device_type = 7;
+	DO_TEST();
+	in.u.conn_stat.displayport_device_plug_status = 1;
+	DO_TEST();
+	in.u.conn_stat.message_capability_status = 1;
+	DO_TEST();
+	in.u.conn_stat.input_port = 1;
+	DO_TEST();
+
+	in.req_type = DP_RESOURCE_STATUS_NOTIFY;
+	in.u.resource_stat.port_number = 0xf;
+	get_random_bytes(in.u.resource_stat.guid, sizeof(in.u.resource_stat.guid));
+	in.u.resource_stat.available_pbn = 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_REMOTE_I2C_WRITE);
 #undef DO_TEST
 	return 0;
 }
-- 
2.32.0.93.g670b81a890-goog


^ permalink raw reply related	[flat|nested] 3+ messages in thread
* [PATCH v7 2/3] drm/dp_mst: Add support for sink event notify messages
  2021-06-28  9:17 [PATCH v7 1/3] drm/dp_mst: Add self-tests for up requests Sam McNally
@ 2021-06-28  9:17 ` Sam McNally
  2021-06-28  9:17 ` [PATCH v7 3/3] drm_dp_cec: add MST support Sam McNally
  1 sibling, 0 replies; 3+ messages in thread
From: Sam McNally @ 2021-06-28  9:17 UTC (permalink / raw)
  To: LKML
  Cc: Lyude Paul, Hans Verkuil, Sam McNally, Anshuman Gupta,
	Daniel Vetter, David Airlie, Lee Jones, Maarten Lankhorst,
	Maxime Ripard, Sean Paul, Thomas Zimmermann, dri-devel

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.

Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Sam McNally <sammc@chromium.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 ee58f6517482..1cc1a58cfa8b 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -476,6 +476,20 @@ 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;
 }
@@ -722,6 +736,12 @@ 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;
@@ -1166,6 +1186,30 @@ 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)
@@ -1178,6 +1222,8 @@ 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));
@@ -4113,6 +4159,8 @@ 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);
@@ -4184,7 +4232,8 @@ 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);
@@ -4212,6 +4261,12 @@ 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 ddb9231d0309..dd1cac5cdb0f 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;
-- 
2.32.0.93.g670b81a890-goog


^ permalink raw reply related	[flat|nested] 3+ messages in thread
* [PATCH v7 3/3] drm_dp_cec: add MST support
  2021-06-28  9:17 [PATCH v7 1/3] drm/dp_mst: Add self-tests for up requests Sam McNally
  2021-06-28  9:17 ` [PATCH v7 2/3] drm/dp_mst: Add support for sink event notify messages Sam McNally
@ 2021-06-28  9:17 ` Sam McNally
  1 sibling, 0 replies; 3+ messages in thread
From: Sam McNally @ 2021-06-28  9:17 UTC (permalink / raw)
  To: LKML
  Cc: Lyude Paul, Hans Verkuil, Sam McNally, Hans Verkuil,
	kernel test robot, Daniel Vetter, David Airlie,
	Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, dri-devel

With DP v2.0 errata E5, CEC tunneling can be supported through an MST
topology.

When tunneling CEC through an MST port, CEC IRQs are delivered via a
sink event notify message; when a sink event notify message is received,
trigger CEC IRQ handling - ESI1 is not used for remote CEC IRQs so its
value is not checked.

Register and unregister for all MST connectors, ensuring their
drm_dp_aux_cec struct won't be accessed uninitialized.

Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Sam McNally <sammc@chromium.org>
---

Changes in v7:
- Added mutex_init() for aux->cec.lock

Changes in v6:
- Removed superfluous #include <drm/drm_dp_mst_helper.h>
- Removed spurious added newlines

Changes in v4:
- Removed use of work queues
- Updated checks of aux.transfer to accept aux.is_remote

Changes in v3:
- Fixed whitespace in drm_dp_cec_mst_irq_work()
- Moved drm_dp_cec_mst_set_edid_work() with the other set_edid functions

Changes in v2:
- Used aux->is_remote instead of aux->cec.is_mst, removing the need for
  the previous patch in the series
- Added a defensive check for null edid in the deferred set_edid work,
  in case the edid is no longer valid at that point

 drivers/gpu/drm/drm_dp_cec.c          | 17 +++++++++++++----
 drivers/gpu/drm/drm_dp_helper.c       |  3 ++-
 drivers/gpu/drm/drm_dp_mst_topology.c | 24 ++++++++++++++++++++++++
 3 files changed, 39 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/drm_dp_cec.c b/drivers/gpu/drm/drm_dp_cec.c
index 3ab2609f9ec7..61c59e2c4b3e 100644
--- a/drivers/gpu/drm/drm_dp_cec.c
+++ b/drivers/gpu/drm/drm_dp_cec.c
@@ -245,13 +245,22 @@ void drm_dp_cec_irq(struct drm_dp_aux *aux)
 	int ret;
 
 	/* No transfer function was set, so not a DP connector */
-	if (!aux->transfer)
+	if (!aux->transfer && !aux->is_remote)
 		return;
 
 	mutex_lock(&aux->cec.lock);
 	if (!aux->cec.adap)
 		goto unlock;
 
+	if (aux->is_remote) {
+		/*
+		 * For remote connectors, CEC IRQ is triggered by an explicit
+		 * message so ESI1 is not involved.
+		 */
+		drm_dp_cec_handle_irq(aux);
+		goto unlock;
+	}
+
 	ret = drm_dp_dpcd_readb(aux, DP_DEVICE_SERVICE_IRQ_VECTOR_ESI1,
 				&cec_irq);
 	if (ret < 0 || !(cec_irq & DP_CEC_IRQ))
@@ -307,7 +316,7 @@ void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid)
 	u8 cap;
 
 	/* No transfer function was set, so not a DP connector */
-	if (!aux->transfer)
+	if (!aux->transfer && !aux->is_remote)
 		return;
 
 #ifndef CONFIG_MEDIA_CEC_RC
@@ -383,7 +392,7 @@ EXPORT_SYMBOL(drm_dp_cec_set_edid);
 void drm_dp_cec_unset_edid(struct drm_dp_aux *aux)
 {
 	/* No transfer function was set, so not a DP connector */
-	if (!aux->transfer)
+	if (!aux->transfer && !aux->is_remote)
 		return;
 
 	cancel_delayed_work_sync(&aux->cec.unregister_work);
@@ -428,7 +437,7 @@ void drm_dp_cec_register_connector(struct drm_dp_aux *aux,
 				   struct drm_connector *connector)
 {
 	WARN_ON(aux->cec.adap);
-	if (WARN_ON(!aux->transfer))
+	if (WARN_ON(!aux->transfer && !aux->is_remote))
 		return;
 	aux->cec.connector = connector;
 	INIT_DELAYED_WORK(&aux->cec.unregister_work,
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 24bbc710c825..db566062058c 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -1723,10 +1723,11 @@ static void drm_dp_aux_crc_work(struct work_struct *work)
  * @aux: DisplayPort AUX channel
  *
  * Used for remote aux channel in general. Merely initialize the crc work
- * struct.
+ * struct and CEC lock.
  */
 void drm_dp_remote_aux_init(struct drm_dp_aux *aux)
 {
+	mutex_init(&aux->cec.lock);
 	INIT_WORK(&aux->crc_work, drm_dp_aux_crc_work);
 }
 EXPORT_SYMBOL(drm_dp_remote_aux_init);
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index 1cc1a58cfa8b..b58c884fe67b 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -2362,6 +2362,8 @@ static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb,
 int drm_dp_mst_connector_late_register(struct drm_connector *connector,
 				       struct drm_dp_mst_port *port)
 {
+	drm_dp_cec_register_connector(&port->aux, connector);
+
 	drm_dbg_kms(port->mgr->dev, "registering %s remote bus for %s\n",
 		    port->aux.name, connector->kdev->kobj.name);
 
@@ -2385,6 +2387,8 @@ void drm_dp_mst_connector_early_unregister(struct drm_connector *connector,
 	drm_dbg_kms(port->mgr->dev, "unregistering %s remote bus for %s\n",
 		    port->aux.name, connector->kdev->kobj.name);
 	drm_dp_aux_unregister_devnode(&port->aux);
+
+	drm_dp_cec_unregister_connector(&port->aux);
 }
 EXPORT_SYMBOL(drm_dp_mst_connector_early_unregister);
 
@@ -2662,6 +2666,21 @@ drm_dp_mst_handle_conn_stat(struct drm_dp_mst_branch *mstb,
 		queue_work(system_long_wq, &mstb->mgr->work);
 }
 
+static void
+drm_dp_mst_handle_sink_event(struct drm_dp_mst_branch *mstb,
+			    struct drm_dp_sink_event_notify *sink_event)
+{
+	struct drm_dp_mst_port *port;
+
+	if (sink_event->event_id & DP_SINK_EVENT_CEC_IRQ_EVENT) {
+		port = drm_dp_get_port(mstb, sink_event->port_number);
+		if (port) {
+			drm_dp_cec_irq(&port->aux);
+			drm_dp_mst_topology_put_port(port);
+		}
+	}
+}
+
 static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr,
 							       u8 lct, u8 *rad)
 {
@@ -4177,6 +4196,8 @@ drm_dp_mst_process_up_req(struct drm_dp_mst_topology_mgr *mgr,
 	if (msg->req_type == DP_CONNECTION_STATUS_NOTIFY) {
 		drm_dp_mst_handle_conn_stat(mstb, &msg->u.conn_stat);
 		hotplug = true;
+	} else if (msg->req_type == DP_SINK_EVENT_NOTIFY) {
+		drm_dp_mst_handle_sink_event(mstb, &msg->u.sink_event);
 	}
 
 	drm_dp_mst_topology_put_mstb(mstb);
@@ -4369,6 +4390,8 @@ drm_dp_mst_detect_port(struct drm_connector *connector,
 		break;
 	}
 out:
+	if (ret != connector_status_connected)
+		drm_dp_cec_unset_edid(&port->aux);
 	drm_dp_mst_topology_put_port(port);
 	return ret;
 }
@@ -4399,6 +4422,7 @@ struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_
 		edid = drm_get_edid(connector, &port->aux.ddc);
 	}
 	port->has_audio = drm_detect_monitor_audio(edid);
+	drm_dp_cec_set_edid(&port->aux, edid);
 	drm_dp_mst_topology_put_port(port);
 	return edid;
 }
-- 
2.32.0.93.g670b81a890-goog


^ permalink raw reply related	[flat|nested] 3+ messages in thread
end of thread, other threads:[~2021-06-28  9:17 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-06-28  9:17 [PATCH v7 1/3] drm/dp_mst: Add self-tests for up requests Sam McNally
2021-06-28  9:17 ` [PATCH v7 2/3] drm/dp_mst: Add support for sink event notify messages Sam McNally
2021-06-28  9:17 ` [PATCH v7 3/3] drm_dp_cec: add MST support Sam McNally

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