Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 46D2F6087D
From:   Balakrishna Godavarthi <bgodavar@codeaurora.org>
To:     marcel@holtmann.org, johan.hedberg@gmail.com
Cc:     mka@chromium.org, linux-kernel@vger.kernel.org,
        linux-bluetooth@vger.kernel.org, hemantg@codeaurora.org,
        linux-arm-msm@vger.kernel.org,
        Balakrishna Godavarthi <bgodavar@codeaurora.org>
Subject: [PATCH v8 3/3] Bluetooth: hci_qca: Disable IBS state machine and flush Tx buffer
Date:   Wed, 16 Jan 2019 17:16:03 +0530
Message-Id: <20190116114603.500-4-bgodavar@codeaurora.org>
In-Reply-To: <20190116114603.500-1-bgodavar@codeaurora.org>
References: <20190116114603.500-1-bgodavar@codeaurora.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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@codeaurora.org>
---
 drivers/bluetooth/hci_qca.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index 7e4afcf40da2..7330ba71ada4 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -1275,6 +1275,14 @@ static const struct qca_vreg_data qca_soc_data = {
 
 static void qca_power_shutdown(struct hci_uart *hu)
 {
+	struct qca_data *qca = hu->priv;
+
+	/* From this point we go into power off state. But serial port is
+	 * still open, stop queueing the IBS data and flush all the buffered
+	 * data in skb's.
+	 */
+	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);
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project