linux-kernel - [PATCH 3/3] Bluetooth: hci_qca: Add delay after power-off pulse

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Date:   Mon, 25 Feb 2019 15:49:54 -0800
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>
Cc:     linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
        Balakrishna Godavarthi <bgodavar@...eaurora.org>,
        Matthias Kaehlcke <mka@...omium.org>
Subject: [PATCH 3/3] Bluetooth: hci_qca: Add delay after power-off pulse

During initialization the power-on pulse is currently sent inmediately
after the prior power-off pulse. With this initialization often fails
at boot time:

[   15.205224] Bluetooth: hci0: setting up wcn3990
[   17.341062] Bluetooth: hci0: command 0xfc00 tx timeout
[   22.101453] ERROR: Bluetooth initialization failed
[   25.337740] Bluetooth: hci0: Reading QCA version information failed (-110)

After a power-off pulse wait 10ms to give the controller time to power
off.

Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
---
 drivers/bluetooth/hci_qca.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index eacc108c422d0..c89c1ed87ffe9 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -1036,8 +1036,11 @@ static int qca_send_power_pulse(struct hci_uart *hu, bool on)
 	usleep_range(100, 200);
 	hci_uart_set_flow_control(hu, false);
 
+	/* Give to controller time to boot/shutdown */
 	if (on)
 		msleep(100);
+	else
+		msleep(10);
 
 	return 0;
 }
-- 
2.21.0.rc0.258.g878e2cd30e-goog