linux-kernel - [PATCH 4/4] Bluetooth: btmtksdio: add support of processing firmware coredump and log

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Date:   Sat, 20 Nov 2021 06:25:46 +0800
From:   <sean.wang@...iatek.com>
To:     <marcel@...tmann.org>, <johan.hedberg@...il.com>
CC:     <Mark-YW.Chen@...iatek.com>, <sean.wang@...iatek.com>,
        <Soul.Huang@...iatek.com>, <YN.Chen@...iatek.com>,
        <Leon.Yen@...iatek.com>, <Eric-SY.Chang@...iatek.com>,
        <Deren.Wu@...iatek.com>, <km.lin@...iatek.com>,
        <robin.chiu@...iatek.com>, <Eddie.Chen@...iatek.com>,
        <ch.yeh@...iatek.com>, <posh.sun@...iatek.com>,
        <ted.huang@...iatek.com>, <Eric.Liang@...iatek.com>,
        <Stella.Chang@...iatek.com>, <Tom.Chou@...iatek.com>,
        <steve.lee@...iatek.com>, <jsiuda@...gle.com>,
        <frankgor@...gle.com>, <jemele@...gle.com>,
        <abhishekpandit@...gle.com>, <michaelfsun@...gle.com>,
        <mcchou@...omium.org>, <shawnku@...gle.com>,
        <linux-bluetooth@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Mark-yw Chen <mark-yw.chen@...iatek.com>
Subject: [PATCH 4/4] Bluetooth: btmtksdio: add support of processing firmware coredump and log

From: Sean Wang <sean.wang@...iatek.com>

Add support of processing the firmware coredump and log for the diagnostic
purpose.

Co-developed-by: Mark-yw Chen <mark-yw.chen@...iatek.com>
Signed-off-by: Mark-yw Chen <mark-yw.chen@...iatek.com>
Signed-off-by: Sean Wang <sean.wang@...iatek.com>
---
 drivers/bluetooth/btmtksdio.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/btmtksdio.c b/drivers/bluetooth/btmtksdio.c
index cae1fcd15512..adf9c89648cc 100644
--- a/drivers/bluetooth/btmtksdio.c
+++ b/drivers/bluetooth/btmtksdio.c
@@ -324,8 +324,29 @@ static int btmtksdio_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
 	return err;
 }
 
+static int btmtksdio_recv_acl(struct hci_dev *hdev, struct sk_buff *skb)
+{
+	struct btmtksdio_dev *bdev = hci_get_drvdata(hdev);
+	u16 handle = le16_to_cpu(hci_acl_hdr(skb)->handle);
+
+	switch (handle) {
+	case 0xfc6f:
+		/* Firmware dump from device: when the firmware hangs, the
+		 * device can no longer suspend and thus disable auto-suspend.
+		 */
+		pm_runtime_forbid(bdev->dev);
+		fallthrough;
+	case 0x05ff:
+	case 0x05fe:
+		/* Firmware debug logging */
+		return hci_recv_diag(hdev, skb);
+	}
+
+	return hci_recv_frame(hdev, skb);
+}
+
 static const struct h4_recv_pkt mtk_recv_pkts[] = {
-	{ H4_RECV_ACL,      .recv = hci_recv_frame },
+	{ H4_RECV_ACL,      .recv = btmtksdio_recv_acl },
 	{ H4_RECV_SCO,      .recv = hci_recv_frame },
 	{ H4_RECV_EVENT,    .recv = btmtksdio_recv_event },
 };
-- 
2.25.1