linux-kernel - [PATCH v2] Bluetooth: hci_bcm: Handle specific unknown packets after firmware loading

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Message-Id: <20181205212232.3947-1-pawel.mikolaj.chmiel@gmail.com>
Date:   Wed,  5 Dec 2018 22:22:32 +0100
From:   Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
To:     marcel@...tmann.org, johan.hedberg@...il.com
Cc:     linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jonathan Bakker <xc-racer2@...e.ca>,
        Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
Subject: [PATCH v2] Bluetooth: hci_bcm: Handle specific unknown packets after firmware loading

From: Jonathan Bakker <xc-racer2@...e.ca>

The Broadcom controller on aries S5PV210 boards sends out a couple of
unknown packets after the firmware is loaded.  This will cause
logging of errors such as:
	Bluetooth: hci0: Frame reassembly failed (-84)

This is probably also the case with other boards, as there are related
Android userspace patches for custom ROMs such as
https://review.lineageos.org/#/c/LineageOS/android_system_bt/+/142721/
Since this appears to be intended behaviour, treated them as diagnostic
packets.

Note that this is another variant of commit 01d5e44ace8a
("Bluetooth: hci_bcm: Handle empty packet after firmware loading")

Signed-off-by: Jonathan Bakker <xc-racer2@...e.ca>
Signed-off-by: Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>

---
Changes from v1:
	- Rename UNKNOWN to TYPE49
	- Rename UNKNOWN2 to TYPE52
---
 drivers/bluetooth/hci_bcm.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c
index ddbd8c6a0ceb..7e7a2cfb2f93 100644
--- a/drivers/bluetooth/hci_bcm.c
+++ b/drivers/bluetooth/hci_bcm.c
@@ -51,6 +51,12 @@
 #define BCM_LM_DIAG_PKT 0x07
 #define BCM_LM_DIAG_SIZE 63
 
+#define BCM_TYPE49_PKT 0x31
+#define BCM_TYPE49_SIZE 0
+
+#define BCM_TYPE52_PKT 0x34
+#define BCM_TYPE52_SIZE 0
+
 #define BCM_AUTOSUSPEND_DELAY	5000 /* default autosleep delay */
 
 /**
@@ -561,12 +567,28 @@ static int bcm_setup(struct hci_uart *hu)
 	.lsize = 0, \
 	.maxlen = BCM_NULL_SIZE
 
+#define BCM_RECV_TYPE49 \
+	.type = BCM_TYPE49_PKT, \
+	.hlen = BCM_TYPE49_SIZE, \
+	.loff = 0, \
+	.lsize = 0, \
+	.maxlen = BCM_TYPE49_SIZE
+
+#define BCM_RECV_TYPE52 \
+	.type = BCM_TYPE52_PKT, \
+	.hlen = BCM_TYPE52_SIZE, \
+	.loff = 0, \
+	.lsize = 0, \
+	.maxlen = BCM_TYPE52_SIZE
+
 static const struct h4_recv_pkt bcm_recv_pkts[] = {
 	{ H4_RECV_ACL,      .recv = hci_recv_frame },
 	{ H4_RECV_SCO,      .recv = hci_recv_frame },
 	{ H4_RECV_EVENT,    .recv = hci_recv_frame },
 	{ BCM_RECV_LM_DIAG, .recv = hci_recv_diag  },
 	{ BCM_RECV_NULL,    .recv = hci_recv_diag  },
+	{ BCM_RECV_TYPE49,  .recv = hci_recv_diag  },
+	{ BCM_RECV_TYPE52,  .recv = hci_recv_diag  },
 };
 
 static int bcm_recv(struct hci_uart *hu, const void *data, int count)
-- 
2.17.1