linux-kernel - [PATCH 4.13 42/85] media: cec: Respond to unregistered initiators, when applicable

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Date:   Tue, 24 Oct 2017 15:07:16 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jose Abreu <joabreu@...opsys.com>,
        Joao Pinto <jpinto@...opsys.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Mauro Carvalho Chehab <mchehab@...pensource.com>
Subject: [PATCH 4.13 42/85] media: cec: Respond to unregistered initiators, when applicable

4.13-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jose Abreu <Jose.Abreu@...opsys.com>

commit 845d6524d69b40bd6abd61dc1264a8657159aa55 upstream.

Running CEC 1.4 compliance test we get the following error on test
11.1.6.2: "ERROR: The DUT did not broadcast a
<Report Physical Address> message to the unregistered device."

Fix this by letting GIVE_PHYSICAL_ADDR message respond to unregistered
device. Also, GIVE_DEVICE_VENDOR_ID and GIVE_FEATURES fall in the
same category so, respond also to these messages.

With this fix we pass CEC 1.4 official compliance.

Signed-off-by: Jose Abreu <joabreu@...opsys.com>
Cc: Joao Pinto <jpinto@...opsys.com>
Signed-off-by: Hans Verkuil <hans.verkuil@...co.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...pensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/media/cec/cec-adap.c |   13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

--- a/drivers/media/cec/cec-adap.c
+++ b/drivers/media/cec/cec-adap.c
@@ -1726,12 +1726,19 @@ static int cec_receive_notify(struct cec
 	 */
 	switch (msg->msg[1]) {
 	case CEC_MSG_GET_CEC_VERSION:
-	case CEC_MSG_GIVE_DEVICE_VENDOR_ID:
 	case CEC_MSG_ABORT:
 	case CEC_MSG_GIVE_DEVICE_POWER_STATUS:
-	case CEC_MSG_GIVE_PHYSICAL_ADDR:
 	case CEC_MSG_GIVE_OSD_NAME:
+		/*
+		 * These messages reply with a directed message, so ignore if
+		 * the initiator is Unregistered.
+		 */
+		if (!adap->passthrough && from_unregistered)
+			return 0;
+		/* Fall through */
+	case CEC_MSG_GIVE_DEVICE_VENDOR_ID:
 	case CEC_MSG_GIVE_FEATURES:
+	case CEC_MSG_GIVE_PHYSICAL_ADDR:
 		/*
 		 * Skip processing these messages if the passthrough mode
 		 * is on.
@@ -1739,7 +1746,7 @@ static int cec_receive_notify(struct cec
 		if (adap->passthrough)
 			goto skip_processing;
 		/* Ignore if addressing is wrong */
-		if (is_broadcast || from_unregistered)
+		if (is_broadcast)
 			return 0;
 		break;