linux-kernel - [PATCH v6 5/6] Bluetooth: hci_qca: Update baudrate change wait time for wcn3990

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Message-Id: <20181227073136.8431-6-bgodavar@codeaurora.org>
Date:   Thu, 27 Dec 2018 13:01:35 +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,
        Balakrishna Godavarthi <bgodavar@...eaurora.org>
Subject: [PATCH v6 5/6] 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>
---

Changes in v6:
 * intial patch.

---
 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 4677a6a2716a..61b0fb1ff32f 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -60,7 +60,8 @@
 
 #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
 
 /* susclk rate */
 #define SUSCLK_RATE_32KHZ	32768
@@ -972,8 +973,11 @@ 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;
 
@@ -996,8 +1000,12 @@ 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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