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Subject[PATCH v6 4/6] Bluetooth: hci_qca: Disable IBS state machine and flush Tx buffer
During hci down we observed IBS sleep commands are queued in the Tx
buffer and hci_uart_write_work is sending data to the chip which is
not required as the chip is powered off. This patch will disable IBS
and flush the Tx buffer before we turn off the chip.

Signed-off-by: Balakrishna Godavarthi <>
drivers/bluetooth/hci_qca.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index 0751b2359f6f..4677a6a2716a 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -1287,6 +1287,8 @@ static void qca_power_shutdown(struct hci_uart *hu)
* still open, discard all the garbage data received on the Rx line.
set_bit(STATE_DISCARD_RX, &qca->flags);
+ clear_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
+ qca_flush(hu);
host_set_baudrate(hu, 2400);
qca_send_power_pulse(hu, QCA_WCN3990_POWEROFF_PULSE);
qca_power_setup(hu, false);
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a Linux Foundation Collaborative Project
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