Bluetooth: hci_qca: Add delay after power-off pulse

During initialization the power-on pulse is currently sent inmediately
after the prior power-off pulse. With this initialization often fails
at boot time:

[   15.205224] Bluetooth: hci0: setting up wcn3990
[   17.341062] Bluetooth: hci0: command 0xfc00 tx timeout
[   22.101453] ERROR: Bluetooth initialization failed
[   25.337740] Bluetooth: hci0: Reading QCA version information failed (-110)

After a power-off pulse wait 10ms to give the controller time to power
off. Remove the previous short settling delay, it isn't needed anymore.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Balakrishna Godavarthi <bgodavar@codeaurora.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index bcc70352eb95..f56d2459ea19 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -1031,13 +1031,13 @@ static int qca_send_power_pulse(struct hci_uart *hu, bool on)
         }
 
         serdev_device_wait_until_sent(hu->serdev, timeout);
-
-        /* Wait for 100 uS for SoC to settle down */
-        usleep_range(100, 200);
         hci_uart_set_flow_control(hu, false);
 
+        /* Give to controller time to boot/shutdown */
         if (on)
                 msleep(100);
+        else
+                msleep(10);
 
         return 0;
 }