linux-kernel - [PATCH v3 4/4] Bluetooth: hci_qca: Disable IBS state machine and flush Tx buffer

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Message-Id: <20181130150247.26294-5-bgodavar@codeaurora.org>
Date:   Fri, 30 Nov 2018 20:32:47 +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 v3 4/4] 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>
---
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 d595a82cb4b9..6f2a4bf7ba17 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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