Bluetooth: hci_qca: Reduce delay after sending baudrate request for WCN3990

The current 300ms delay after a baudrate change is extremely long.
For WCN3990 it is sufficient to wait 10ms after the baudrate change
request has been sent over the wire.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 18 insertions, 8 deletions

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index 82f6cec4f71e..237aea34b69f 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -59,8 +59,7 @@
 
 #define IBS_WAKE_RETRANS_TIMEOUT_MS     100
 #define IBS_TX_IDLE_TIMEOUT_MS          2000
-#define BAUDRATE_SETTLE_TIMEOUT_MS      300
-#define POWER_PULSE_TRANS_TIMEOUT_MS    100
+#define CMD_TRANS_TIMEOUT_MS            100
 
 /* susclk rate */
 #define SUSCLK_RATE_32KHZ       32768
@@ -964,6 +963,7 @@ 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 qca_serdev *qcadev;
         struct sk_buff *skb;
         u8 cmd[] = { 0x01, 0x48, 0xFC, 0x01, 0x00 };
 
@@ -985,11 +985,21 @@ static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
         skb_queue_tail(&qca->txq, skb);
         hci_uart_tx_wakeup(hu);
 
-        /* wait 300ms to change new baudrate on controller side
-         * controller will come back after they receive this HCI command
-         * then host can communicate with new baudrate to controller
-         */
-        msleep(BAUDRATE_SETTLE_TIMEOUT_MS);
+        qcadev = serdev_device_get_drvdata(hu->serdev);
+
+        /* Wait for the baudrate change request to be sent */
+
+        while (!skb_queue_empty(&qca->txq))
+                usleep_range(100, 200);
+
+        serdev_device_wait_until_sent(hu->serdev,
+                      msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS));
+
+        /* Give the controller time to process the request */
+        if (qcadev->btsoc_type == QCA_WCN3990)
+                msleep(10);
+        else
+                msleep(300);
 
         return 0;
 }
@@ -1005,7 +1015,7 @@ static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
 static int qca_send_power_pulse(struct hci_uart *hu, bool on)
 {
         int ret;
-        int timeout = msecs_to_jiffies(POWER_PULSE_TRANS_TIMEOUT_MS);
+        int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS);
         u8 cmd = on ? QCA_WCN3990_POWERON_PULSE : QCA_WCN3990_POWEROFF_PULSE;
 
         /* These power pulses are single byte command which are sent