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Date:   Fri, 14 Feb 2020 10:45:46 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Reto Schneider <reto.schneider@...qvarnagroup.com>,
        Stefan Roese <sr@...x.de>, Paul Burton <paul.burton@...s.com>,
        Paul Burton <paulburton@...nel.org>,
        linux-mips@...r.kernel.org, Sasha Levin <sashal@...nel.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.5 354/542] MIPS: ralink: dts: gardena_smart_gateway_mt7688: Limit UART1

From: Reto Schneider <reto.schneider@...qvarnagroup.com>

[ Upstream commit e8c192011c920517e5578d51c7aff0ecadd25de3 ]

The radio module asserts CTS when its RX buffer has 10 bytes left.
Putting just 8 instead of 16 bytes into the UART1 TX buffer on the Linux
side ensures to not overflow the RX buffer on the radio module side.

Signed-off-by: Reto Schneider <reto.schneider@...qvarnagroup.com>
Signed-off-by: Stefan Roese <sr@...x.de>
Cc: Paul Burton <paul.burton@...s.com>
Signed-off-by: Paul Burton <paulburton@...nel.org>
Cc: linux-mips@...r.kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/mips/boot/dts/ralink/gardena_smart_gateway_mt7688.dts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/mips/boot/dts/ralink/gardena_smart_gateway_mt7688.dts b/arch/mips/boot/dts/ralink/gardena_smart_gateway_mt7688.dts
index aa5caaa311047..aad9a8a8669b4 100644
--- a/arch/mips/boot/dts/ralink/gardena_smart_gateway_mt7688.dts
+++ b/arch/mips/boot/dts/ralink/gardena_smart_gateway_mt7688.dts
@@ -177,6 +177,9 @@
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinmux_i2s_gpio>;		/* GPIO0..3 */
 
+	fifo-size = <8>;
+	tx-threshold = <8>;
+
 	rts-gpios = <&gpio 1 GPIO_ACTIVE_LOW>;
 	cts-gpios = <&gpio 2 GPIO_ACTIVE_LOW>;
 };
-- 
2.20.1

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