linux-kernel - [PATCH v4 4/5] Bluetooth: hci_qca: Disable IBS state machine and flush Tx buffer

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Message-Id: <20181217141330.6294-5-bgodavar@codeaurora.org>
Date:   Mon, 17 Dec 2018 19:43:29 +0530
From:   Balakrishna Godavarthi <bgodavar@...eaurora.org>
To:     marcel@...tmann.org, johan.hedberg@...il.com, johan@...nel.org
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 v4 4/5] 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 <bgodavar@...eaurora.org>
---
v4:
  * no change.
v3: 
  * initial patch
---
 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 e7e65c4361e6..cb1695bac4f0 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -1286,6 +1286,8 @@ 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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