From 0f3a10687b9a6d26b9808432bb8ad0aa17210ea5 Mon Sep 17 00:00:00 2001 From: Lukasz Majewski Date: Thu, 10 Oct 2019 11:08:02 +0200 Subject: [PATCH] ARM: dts: Disable DMA support on the BK4 vf610 device's fsl_lpuart This change disables the DMA support (RX/TX) on the NXP's fsl_lpuart driver - the PIO mode is used instead. This change is necessary for better robustness of BK4's device use cases with many potentially interrupted short serial transfers. Without it the driver hangs when some distortion happens on UART lines. Signed-off-by: Lukasz Majewski Suggested-by: Robin Murphy Signed-off-by: Shawn Guo --- arch/arm/boot/dts/vf610-bk4.dts | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm/boot/dts/vf610-bk4.dts b/arch/arm/boot/dts/vf610-bk4.dts index 0f3870d..830c854 100644 --- a/arch/arm/boot/dts/vf610-bk4.dts +++ b/arch/arm/boot/dts/vf610-bk4.dts @@ -259,24 +259,28 @@ &uart0 { pinctrl-names = "default"; pinctrl-0 = <&pinctrl_uart0>; + /delete-property/dma-names; status = "okay"; }; &uart1 { pinctrl-names = "default"; pinctrl-0 = <&pinctrl_uart1>; + /delete-property/dma-names; status = "okay"; }; &uart2 { pinctrl-names = "default"; pinctrl-0 = <&pinctrl_uart2>; + /delete-property/dma-names; status = "okay"; }; &uart3 { pinctrl-names = "default"; pinctrl-0 = <&pinctrl_uart3>; + /delete-property/dma-names; status = "okay"; }; -- 2.7.4