linux-kernel - [PATCH 4.18 144/158] mfd: rave-sp: Initialize flow control and parity of the port

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Date:   Tue, 18 Sep 2018 00:42:54 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Andrey Smirnov <andrew.smirnov@...il.com>,
        Lee Jones <lee.jones@...aro.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.18 144/158] mfd: rave-sp: Initialize flow control and parity of the port

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Andrey Smirnov <andrew.smirnov@...il.com>

[ Upstream commit 6c450bdf13ebe110821a74960936cec936edae49 ]

Relying on serial port defaults for flow control and parity can result
in complete breakdown of communication with RAVE SP on some platforms
where defaults are not what we need them to be. One such case is
VF610-base ZII SPU3 board (not supported upstream). To avoid this
problem in the future, add code to explicitly configure both.

Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/mfd/rave-sp.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/mfd/rave-sp.c
+++ b/drivers/mfd/rave-sp.c
@@ -776,6 +776,13 @@ static int rave_sp_probe(struct serdev_d
 		return ret;
 
 	serdev_device_set_baudrate(serdev, baud);
+	serdev_device_set_flow_control(serdev, false);
+
+	ret = serdev_device_set_parity(serdev, SERDEV_PARITY_NONE);
+	if (ret) {
+		dev_err(dev, "Failed to set parity\n");
+		return ret;
+	}
 
 	ret = rave_sp_get_status(sp);
 	if (ret) {