linux-kernel - [PATCH] Bluetooth: serdev: hci_ll: set operational frequency earlier

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Message-Id: <20190702141337.10528-1-philipp.puschmann@emlix.com>
Date:   Tue,  2 Jul 2019 16:13:37 +0200
From:   Philipp Puschmann <philipp.puschmann@...ix.com>
To:     marcel@...tmann.org
Cc:     johan.hedberg@...il.com, linux-bluetooth@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Philipp Puschmann <philipp.puschmann@...ix.com>
Subject: [PATCH] Bluetooth: serdev: hci_ll: set operational frequency earlier

Uploading the firmware needs quite a few seconds if done at 115200 kbps. So set
the operational frequency, usually 3 MHz, before uploading the firmware.

I have successfully tested this with a wl1837mod.

Signed-off-by: Philipp Puschmann <philipp.puschmann@...ix.com>
---
 drivers/bluetooth/hci_ll.c | 39 ++++++++++++++++++++------------------
 1 file changed, 21 insertions(+), 18 deletions(-)

diff --git a/drivers/bluetooth/hci_ll.c b/drivers/bluetooth/hci_ll.c
index c04f5f9e1ed0..cbd7bc539d5e 100644
--- a/drivers/bluetooth/hci_ll.c
+++ b/drivers/bluetooth/hci_ll.c
@@ -601,6 +601,13 @@ static int ll_setup(struct hci_uart *hu)
 
 	serdev_device_set_flow_control(serdev, true);
 
+	if (hu->oper_speed)
+		speed = hu->oper_speed;
+	else if (hu->proto->oper_speed)
+		speed = hu->proto->oper_speed;
+	else
+		speed = 0;
+
 	do {
 		/* Reset the Bluetooth device */
 		gpiod_set_value_cansleep(lldev->enable_gpio, 0);
@@ -612,6 +619,20 @@ static int ll_setup(struct hci_uart *hu)
 			return err;
 		}
 
+		if (speed) {
+			__le32 speed_le = cpu_to_le32(speed);
+			struct sk_buff *skb;
+
+			skb = __hci_cmd_sync(hu->hdev,
+					     HCI_VS_UPDATE_UART_HCI_BAUDRATE,
+					     sizeof(speed_le), &speed_le,
+					     HCI_INIT_TIMEOUT);
+			if (!IS_ERR(skb)) {
+				kfree_skb(skb);
+				serdev_device_set_baudrate(serdev, speed);
+			}
+		}
+
 		err = download_firmware(lldev);
 		if (!err)
 			break;
@@ -636,25 +657,7 @@ static int ll_setup(struct hci_uart *hu)
 	}
 
 	/* Operational speed if any */
-	if (hu->oper_speed)
-		speed = hu->oper_speed;
-	else if (hu->proto->oper_speed)
-		speed = hu->proto->oper_speed;
-	else
-		speed = 0;
-
-	if (speed) {
-		__le32 speed_le = cpu_to_le32(speed);
-		struct sk_buff *skb;
 
-		skb = __hci_cmd_sync(hu->hdev, HCI_VS_UPDATE_UART_HCI_BAUDRATE,
-				     sizeof(speed_le), &speed_le,
-				     HCI_INIT_TIMEOUT);
-		if (!IS_ERR(skb)) {
-			kfree_skb(skb);
-			serdev_device_set_baudrate(serdev, speed);
-		}
-	}
 
 	return 0;
 }
-- 
2.20.1