linux-kernel - [PATCH v3] Bluetooth: hci_qca: Add support for controller debug logs.

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Message-Id: <20181016142135.16480-1-bgodavar@codeaurora.org>
Date:   Tue, 16 Oct 2018 19:51:35 +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, c-hbandi@...eaurora.orhg,
        Balakrishna Godavarthi <bgodavar@...eaurora.org>,
        Harish Bandi <c-hbandi@...eaurora.org>
Subject: [PATCH v3] 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>
---
v3:
  * used get_unaligned_le16() instead of checking individual bytes
v2: 
  * Addressed reviewer comments.
v1: 
  * initial patch
---
 drivers/bluetooth/hci_qca.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index 9f1392fc7105..f036c8f98ea3 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -40,6 +40,7 @@
 #include <linux/platform_device.h>
 #include <linux/regulator/consumer.h>
 #include <linux/serdev.h>
+#include <asm/unaligned.h>
 
 #include <net/bluetooth/bluetooth.h>
 #include <net/bluetooth/hci_core.h>
@@ -63,6 +64,9 @@
 /* susclk rate */
 #define SUSCLK_RATE_32KHZ	32768
 
+/* Controller debug log header */
+#define QCA_DEBUG_HANDLE	0x2EDC
+
 /* HCI_IBS transmit side sleep protocol states */
 enum tx_ibs_states {
 	HCI_IBS_TX_ASLEEP,
@@ -849,6 +853,19 @@ 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 (get_unaligned_le16(skb->data) == QCA_DEBUG_HANDLE)
+		return hci_recv_diag(hdev, skb);
+
+	return hci_recv_frame(hdev, skb);
+}
+
 #define QCA_IBS_SLEEP_IND_EVENT \
 	.type = HCI_IBS_SLEEP_IND, \
 	.hlen = 0, \
@@ -871,7 +888,7 @@ static int qca_ibs_wake_ack(struct hci_dev *hdev, struct sk_buff *skb)
 	.maxlen = HCI_MAX_IBS_SIZE
 
 static const struct h4_recv_pkt qca_recv_pkts[] = {
-	{ H4_RECV_ACL,             .recv = hci_recv_frame    },
+	{ H4_RECV_ACL,             .recv = qca_recv_acl_data },
 	{ H4_RECV_SCO,             .recv = hci_recv_frame    },
 	{ H4_RECV_EVENT,           .recv = hci_recv_frame    },
 	{ QCA_IBS_WAKE_IND_EVENT,  .recv = qca_ibs_wake_ind  },
-- 
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