linux-kernel - [PATCH v1] bluetooth: hci_qca: Fix qca6390 enable failure after warm reboot

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Message-Id: <1590399072-32407-1-git-send-email-zijuhu@codeaurora.org>
Date:   Mon, 25 May 2020 17:31:12 +0800
From:   Zijun Hu <zijuhu@...eaurora.org>
To:     marcel@...tmann.org, johan.hedberg@...il.com
Cc:     linux-kernel@...r.kernel.org, linux-bluetooth@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, bgodavar@...eaurora.org,
        c-hbandi@...eaurora.org, hemantg@...eaurora.org, mka@...omium.org,
        rjliao@...eaurora.org, zijuhu@...eaurora.org
Subject: [PATCH v1] bluetooth: hci_qca: Fix qca6390 enable failure after warm reboot

Warm reboot can not restore qca6390 controller baudrate
to default due to lack of controllable BT_EN pin or power
supply, so fails to download firmware after warm reboot.

Fixed by sending EDL_SOC_RESET VSC to reset controller
within added device shutdown implementation.

Signed-off-by: Zijun Hu <zijuhu@...eaurora.org>
---
 drivers/bluetooth/btqca.c   |  8 ++++----
 drivers/bluetooth/hci_qca.c | 27 +++++++++++++++++++++++++++
 2 files changed, 31 insertions(+), 4 deletions(-)

diff --git a/drivers/bluetooth/btqca.c b/drivers/bluetooth/btqca.c
index 3ea866d..7bbdf4d 100644
--- a/drivers/bluetooth/btqca.c
+++ b/drivers/bluetooth/btqca.c
@@ -74,10 +74,10 @@ int qca_read_soc_version(struct hci_dev *hdev, u32 *soc_version,
 
 	ver = (struct qca_btsoc_version *)(edl->data);
 
-	BT_DBG("%s: Product:0x%08x", hdev->name, le32_to_cpu(ver->product_id));
-	BT_DBG("%s: Patch  :0x%08x", hdev->name, le16_to_cpu(ver->patch_ver));
-	BT_DBG("%s: ROM    :0x%08x", hdev->name, le16_to_cpu(ver->rom_ver));
-	BT_DBG("%s: SOC    :0x%08x", hdev->name, le32_to_cpu(ver->soc_id));
+	BT_INFO("%s: Product:0x%08x", hdev->name, le32_to_cpu(ver->product_id));
+	BT_INFO("%s: Patch  :0x%08x", hdev->name, le16_to_cpu(ver->patch_ver));
+	BT_INFO("%s: ROM    :0x%08x", hdev->name, le16_to_cpu(ver->rom_ver));
+	BT_INFO("%s: SOC    :0x%08x", hdev->name, le32_to_cpu(ver->soc_id));
 
 	/* QCA chipset version can be decided by patch and SoC
 	 * version, combination with upper 2 bytes from SoC
diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index e4a6823..a4f86e4 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -1975,6 +1975,32 @@ static void qca_serdev_remove(struct serdev_device *serdev)
 	hci_uart_unregister_device(&qcadev->serdev_hu);
 }
 
+static void qca_serdev_shutdown(struct device *dev)
+{
+	int res;
+	int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS);
+	struct serdev_device *serdev = to_serdev_device(dev);
+	struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
+	u8 ibs_wake_cmd[] = {0xfd};
+	u8 edl_reset_soc_cmd[] = {0x01, 0x00, 0xfc, 0x01, 0x05};
+
+	if (qcadev->btsoc_type == QCA_QCA6390) {
+		serdev_device_write_flush(serdev);
+		res = serdev_device_write_buf(serdev,
+				ibs_wake_cmd, sizeof(ibs_wake_cmd));
+		BT_INFO("%s: send ibs_wake_cmd res = %d", __func__, res);
+		serdev_device_wait_until_sent(serdev, timeout);
+		usleep_range(8000, 10000);
+
+		serdev_device_write_flush(serdev);
+		res = serdev_device_write_buf(serdev,
+				edl_reset_soc_cmd, sizeof(edl_reset_soc_cmd));
+		BT_INFO("%s: send edl_reset_soc_cmd res = %d", __func__, res);
+		serdev_device_wait_until_sent(serdev, timeout);
+		usleep_range(8000, 10000);
+	}
+}
+
 static int __maybe_unused qca_suspend(struct device *dev)
 {
 	struct hci_dev *hdev = container_of(dev, struct hci_dev, dev);
@@ -2100,6 +2126,7 @@ static struct serdev_device_driver qca_serdev_driver = {
 		.name = "hci_uart_qca",
 		.of_match_table = of_match_ptr(qca_bluetooth_of_match),
 		.acpi_match_table = ACPI_PTR(qca_bluetooth_acpi_match),
+		.shutdown = qca_serdev_shutdown,
 		.pm = &qca_pm_ops,
 	},
 };
-- 
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