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From:   Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
To:     marcel@holtmann.org, johan.hedberg@gmail.com,
        c-hbandi@codeaurora.org, bgodavar@codeaurora.org
Cc:     linux-bluetooth@vger.kernel.org, linux-arm-msm@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
Subject: [PATCH] Bluetooth: hci_qca: Add delay for wcn3990 stability
Date:   Thu, 17 Oct 2019 14:29:55 -0700
Message-Id: <20191017212955.6266-1-jeffrey.l.hugo@gmail.com>
Sender: linux-bluetooth-owner@vger.kernel.org
Precedence: bulk

On the msm8998 mtp, the response to the baudrate change command is never
received.  On the Lenovo Miix 630, the response to the baudrate change
command is corrupted - "Frame reassembly failed (-84)".

Adding a 50ms delay before re-enabling flow to receive the baudrate change
command response from the wcn3990 addesses both issues, and allows
bluetooth to become functional.

Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
---
 drivers/bluetooth/hci_qca.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index e3164c200eac..265fc60c3850 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -1156,8 +1156,10 @@ static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
 		host_set_baudrate(hu, speed);
 
 error:
-		if (qca_is_wcn399x(soc_type))
+		if (qca_is_wcn399x(soc_type)) {
+			msleep(50);
 			hci_uart_set_flow_control(hu, false);
+		}
 
 		if (soc_type == QCA_WCN3990) {
 			/* Wait for the controller to send the vendor event
-- 
2.17.1