Imx6ul使用两条SPI DMA同时传输时,传输失败

maidong600ml

Hi:

问题描述：

Imx6ul单板在使用两条SPI同时传输时，内核打印如下错误：

[09:42:02][ 684.646483] spi_imx 2010000.ecspi: I/O Error in DMA TX
[09:42:02][ 684.654434] spidev spi2.0: SPI transfer failed: -110
[09:42:02][ 684.660489] spi_master spi2: failed to transfer one message from queue

测试指令：

./spidev_test -D /dev/spidev2.0  -s 30000000 -b 32 -S 1000 &

./spidev_test -D /dev/spidev3.0  -s 30000000 -b 32 -S 1000 &

内核版本：4.14.93+；
SPI配置30M时钟，32bit；

DTS配置：

ecspi2: ecspi@0200c000 {
#address-cells = <1>;
#size-cells = <0>;
compatible = "fsl,imx6ul-ecspi", "fsl,imx51-ecspi";
reg = <0x0200c000 0x4000>;
interrupts = <GIC_SPI 32 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clks IMX6UL_CLK_ECSPI2>,
<&clks IMX6UL_CLK_ECSPI2>;
clock-names = "ipg", "per";
dmas = <&sdma 5 7 1>, <&sdma 6 7 2>;
dma-names = "rx", "tx";
status = "disabled";
};

ecspi3: ecspi@02010000 {
#address-cells = <1>;
#size-cells = <0>;
compatible = "fsl,imx6ul-ecspi", "fsl,imx51-ecspi";
reg = <0x02010000 0x4000>;
interrupts = <GIC_SPI 33 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clks IMX6UL_CLK_ECSPI3>,
<&clks IMX6UL_CLK_ECSPI3>;
clock-names = "ipg", "per";
dmas = <&sdma 7 7 1>, <&sdma 8 7 2>;
dma-names = "rx", "tx";
status = "disabled";
};

maidong600ml

单个SPI传输是正常的，两条SPI同时传输就会有问题。大佬们帮忙看看

maidong600ml

顶一下，等大神解答

lijiatu

楼主你好，请问您单个SPIDMA通信是怎么修改的，我看spi_dev.c和spidev_test.c中并没有DMA相关的代码？楼主可以提供一下这两个文件学习一下吗？