linux-kernel - [PATCH v1] Bluetooth: hci_qca: Add support for controller debug logs.

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Date:   Mon,  1 Oct 2018 19:21:02 +0530
From:   Balakrishna Godavarthi <bgodavar@...eaurora.org>
To:     marcel@...tmann.org, johan.hedberg@...il.com
Cc:     mka@...omium.org, linux-kernel@...r.kernel.org,
        linux-bluetooth@...r.kernel.org, hemantg@...eaurora.org,
        linux-arm-msm@...r.kernel.org,
        Balakrishna Godavarthi <bgodavar@...eaurora.org>,
        Harish Bandi <c-hbandi@...eaurora.org>
Subject: [PATCH v1] Bluetooth: hci_qca: Add support for controller debug logs.

This patch will prevent error messages splashing on console.

[   78.426697] Bluetooth: hci_core.c:hci_acldata_packet() hci0: ACL packet for unknown connection handle 3804
[   78.436682] Bluetooth: hci_core.c:hci_acldata_packet() hci0: ACL packet for unknown connection handle 3804
[   78.446639] Bluetooth: hci_core.c:hci_acldata_packet() hci0: ACL packet for unknown connection handle 3804
[   78.456596] Bluetooth: hci_core.c:hci_acldata_packet() hci0: ACL packet for unknown connection handle 3804

QCA wcn3990 will send the debug logs in the form of ACL packets.
While decoding packet in qca_recv(), marking the received debug log
packet as diagnostic packet.

Signed-off-by: Harish Bandi <c-hbandi@...eaurora.org>
Signed-off-by: Balakrishna Godavarthi <bgodavar@...eaurora.org>
---
 drivers/bluetooth/hci_qca.c | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index d98ed0442201..a00910aaed54 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -63,6 +63,10 @@
 /* susclk rate */
 #define SUSCLK_RATE_32KHZ	32768
 
+/* Controller debug log header */
+#define QCA_DEBUG_HDR_MSB	0xDC
+#define QCA_DEBUG_HDR_LSB	0x2E
+
 /* HCI_IBS transmit side sleep protocol states */
 enum tx_ibs_states {
 	HCI_IBS_TX_ASLEEP,
@@ -849,6 +853,20 @@ static int qca_ibs_wake_ack(struct hci_dev *hdev, struct sk_buff *skb)
 	return 0;
 }
 
+static int qca_recv_acl_data(struct hci_dev *hdev, struct sk_buff *skb)
+{
+	/* We receive debug logs from chip as an ACL packets.
+	 * Instead of sending the data to ACL to decode the
+	 * received data, we are pushing them to the above layers
+	 * as a diagnostic packet.
+	 */
+	if ((skb->len > 2) && (skb->data[0] == QCA_DEBUG_HDR_MSB) &&
+	    (skb->data[1] == QCA_DEBUG_HDR_LSB))
+		return hci_recv_diag(hdev, skb);
+	else
+		return hci_recv_frame(hdev, skb);
+}
+
 #define QCA_IBS_SLEEP_IND_EVENT \
 	.type = HCI_IBS_SLEEP_IND, \
 	.hlen = 0, \
@@ -870,13 +888,20 @@ static int qca_ibs_wake_ack(struct hci_dev *hdev, struct sk_buff *skb)
 	.lsize = 0, \
 	.maxlen = HCI_MAX_IBS_SIZE
 
+#define QCA_RECV_ACL_DATA \
+	.type = HCI_ACLDATA_PKT, \
+	.hlen = HCI_ACL_HDR_SIZE, \
+	.loff = 2, \
+	.lsize = 2, \
+	.maxlen = HCI_MAX_FRAME_SIZE
+
 static const struct h4_recv_pkt qca_recv_pkts[] = {
-	{ H4_RECV_ACL,             .recv = hci_recv_frame    },
 	{ H4_RECV_SCO,             .recv = hci_recv_frame    },
 	{ H4_RECV_EVENT,           .recv = hci_recv_frame    },
 	{ QCA_IBS_WAKE_IND_EVENT,  .recv = qca_ibs_wake_ind  },
 	{ QCA_IBS_WAKE_ACK_EVENT,  .recv = qca_ibs_wake_ack  },
 	{ QCA_IBS_SLEEP_IND_EVENT, .recv = qca_ibs_sleep_ind },
+	{ QCA_RECV_ACL_DATA,       .recv = qca_recv_acl_data },
 };
 
 static int qca_recv(struct hci_uart *hu, const void *data, int count)
-- 
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