IMX6ULL ECSPI4 DMA TX Error

almaz1c — Thu, 01 Oct 2020 23:48:10 GMT

Hello.

Having some IMX6ULL based custom hardware. It communicates with SPI device using ECSPI2. Here is working dts:

&ecspi2 { fsl,spi-num-chipselects = <1>; cs-gpios = <&gpio4 22 0>; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_ecspi2_0>; status = "okay"; dma-names = "rx", "tx"; dmas = <&sdma 5 7 1>, <&sdma 6 7 2>; spidev0: spidev@1 { status = "okay"; compatible = "semtech,sx1301"; spi-max-frequency = <1000000>; reg = <0>; }; };

and

pinctrl_ecspi2_0: ecspi2grp-0 { fsl,pins = < MX6UL_PAD_CSI_DATA02__ECSPI2_MOSI 0x110b1 MX6UL_PAD_CSI_DATA03__ECSPI2_MISO 0x110b1 MX6UL_PAD_CSI_DATA00__ECSPI2_SCLK 0x110b1 MX6UL_PAD_CSI_DATA01__GPIO4_IO22 0x10b0 >; };

Everything works like a charm.

Now I am trying to move this hardware to ECSPI4:

&ecspi4 { fsl,spi-num-chipselects = <1>; cs-gpios = <&gpio4 9 0>; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_ecspi4_0>; status = "okay"; dma-names = "rx", "tx"; dmas = <&sdma 5 7 1>, <&sdma 6 7 2>; spidev0: spidev@1 { status = "okay"; compatible = "semtech,sx1301"; spi-max-frequency = <1000000>; reg = <0>; }; };

and:

pinctrl_ecspi4_0: ecspi4grp-0 { fsl,pins = < MX6UL_PAD_NAND_DATA05__ECSPI4_MOSI 0x110b1 MX6UL_PAD_NAND_DATA06__ECSPI4_MISO 0x110b1 MX6UL_PAD_NAND_DATA04__ECSPI4_SCLK 0x110b1 MX6UL_PAD_NAND_DATA07__GPIO4_IO09 0x10b0 >; };

Now trying to test it:

root@OpenWrt:/# spidev_test -D /dev/spidev3.0 spi mode: 0x0 bits per word: 8 max speed: 500000 Hz (500 KHz) [ 167.763338] spi_imx 2014000.ecspi: I/O Error in DMA TX [ 167.770578] spidev spi3.0: SPI transfer failed: -110 [ 167.775678] spi_master spi3: failed to transfer one message from queue can't send spi message: Operation timed out Aborted

So probably something wrong with this field:

dmas = <&sdma 5 7 1>, <&sdma 6 7 2>;

I copied it as is from working ECSPI2 based dts. What are the magic numbers must be used here?

EDIT:

Seems that first digit in each sdma element is SDMA event number from Table 3-2 IMX6ULLRM. What is rest two digits?

i.MX Processors中的主题 IMX6ULL ECSPI4 DMA TX Error

IMX6ULL ECSPI4 DMA TX Error