linux-kernel - [PATCH v1] Bluetooth: hci_qca: Update baudrate change wait time for wcn3990

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Date:   Wed, 20 Feb 2019 16:55:16 +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>
Subject: [PATCH v1] Bluetooth: hci_qca: Update baudrate change wait time for wcn3990

This patch will update the baudrate change request wait time from
300 ms to 100 ms. When host sends the change baudrate request to
the controller, controller sets its clock and wait until the
clocks settle down. Here the Wait time is required for both
host and controller to be on sync.

Signed-off-by: Balakrishna Godavarthi <bgodavar@...eaurora.org>
---
 drivers/bluetooth/hci_qca.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index 5e03504c4e0c..22f3c983f868 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -59,7 +59,8 @@
 
 #define IBS_WAKE_RETRANS_TIMEOUT_MS	100
 #define IBS_TX_IDLE_TIMEOUT_MS		2000
-#define BAUDRATE_SETTLE_TIMEOUT_MS	300
+#define ROME_BD_SETTLE_TIMEOUT_MS	300
+#define WCN3990_BD_SETTLE_TIMEOUT_MS	100
 #define POWER_PULSE_TRANS_TIMEOUT_MS	100
 
 /* susclk rate */
@@ -965,8 +966,11 @@ static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
 	struct hci_uart *hu = hci_get_drvdata(hdev);
 	struct qca_data *qca = hu->priv;
 	struct sk_buff *skb;
+	struct qca_serdev *qcadev;
+	unsigned int bd_settling_timeout;
 	u8 cmd[] = { 0x01, 0x48, 0xFC, 0x01, 0x00 };
 
+	qcadev = serdev_device_get_drvdata(hu->serdev);
 	if (baudrate > QCA_BAUDRATE_3200000)
 		return -EINVAL;
 
@@ -989,8 +993,12 @@ static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
 	 * controller will come back after they receive this HCI command
 	 * then host can communicate with new baudrate to controller
 	 */
+	bd_settling_timeout = qcadev->btsoc_type == QCA_WCN3990 ?
+			       WCN3990_BD_SETTLE_TIMEOUT_MS :
+			       ROME_BD_SETTLE_TIMEOUT_MS;
+
 	set_current_state(TASK_UNINTERRUPTIBLE);
-	schedule_timeout(msecs_to_jiffies(BAUDRATE_SETTLE_TIMEOUT_MS));
+	schedule_timeout(msecs_to_jiffies(bd_settling_timeout));
 	set_current_state(TASK_RUNNING);
 
 	return 0;
-- 
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