From 035a960e7a279a59d74585105dcd263559d74f24 Mon Sep 17 00:00:00 2001 From: Balakrishna Godavarthi Date: Mon, 4 Feb 2019 20:36:43 +0530 Subject: [PATCH] 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 Reviewed-by: Matthias Kaehlcke Signed-off-by: Marcel Holtmann --- drivers/bluetooth/hci_qca.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c index e3cf0dbfc89d..5e03504c4e0c 100644 --- a/drivers/bluetooth/hci_qca.c +++ b/drivers/bluetooth/hci_qca.c @@ -771,16 +771,17 @@ static int qca_enqueue(struct hci_uart *hu, struct sk_buff *skb) /* Prepend skb with frame type */ memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); + spin_lock_irqsave(&qca->hci_ibs_lock, flags); + /* Don't go to sleep in middle of patch download or * Out-Of-Band(GPIOs control) sleep is selected. */ if (!test_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags)) { skb_queue_tail(&qca->txq, skb); + spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); return 0; } - spin_lock_irqsave(&qca->hci_ibs_lock, flags); - /* Act according to current state */ switch (qca->tx_ibs_state) { case HCI_IBS_TX_AWAKE: @@ -1275,6 +1276,18 @@ static const struct qca_vreg_data qca_soc_data = { static void qca_power_shutdown(struct hci_uart *hu) { + struct qca_data *qca = hu->priv; + unsigned long flags; + + /* 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. + */ + spin_lock_irqsave(&qca->hci_ibs_lock, flags); + clear_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags); + qca_flush(hu); + spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); + host_set_baudrate(hu, 2400); qca_send_power_pulse(hu, QCA_WCN3990_POWEROFF_PULSE); qca_power_setup(hu, false);