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Date:   Mon, 20 Nov 2023 09:47:48 +0100
From:   Francesco Dolcini <francesco@dolcini.it>
To:     linux@bigler.io
Cc:     Stefan Moring <stefan.moring@technolution.nl>,
        Linux regressions mailing list <regressions@lists.linux.dev>,
        Mark Brown <broonie@kernel.org>, linux-kernel@vger.kernel.org,
        linux-spi@vger.kernel.org
Subject: Re: spi: imx: Increase imx51 ecspi burst length fails on imx6dl and
 imx8mm
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On Mon, Nov 20, 2023 at 09:27:10AM +0100, linux@bigler.io wrote:
> Load the spi-dma (imx-sdma 302c0000.dma-controller: loaded firmware
> 4.5), run the spi_imx and the spidev as kenelmodule.
> 
> I run the code on a Toradex Verdin Development Board and use the
> imx8mm-verdin-nonwifi-dev.dts
> 
> To add the spidev I patched imx8mm-verdin.dtsi
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi
> index 6f0811587142..262500940adc 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi
> @@ -209,6 +209,15 @@ &ecspi2 {
>         cs-gpios = <&gpio5 13 GPIO_ACTIVE_LOW>;
>         pinctrl-names = "default";
>         pinctrl-0 = <&pinctrl_ecspi2>;
> +
> +       spidev@0{
> +               compatible = "micron,spi-authenta";
> +               reg = <0>;
> +               #address-cells = <1>;
> +               #size-cells = <0>;
> +               spi-max-frequency = <20000000>;
> +               status = "okay";
> +       };
>  };
> 
> as a spidev test program I used 
> https://raw.githubusercontent.com/raspberrypi/linux/rpi-3.10.y/Documentation/spi/spidev_test.c

Would you mind doing the following tests looping the SPI interface MISO/MOSI?

```
cd /tmp

dd if=/dev/urandom of=4k-spi-test-data.bin bs=1 count=4k
spidev_test -D "$device" -s 4000000 -i 4k-spi-test-data.bin -o 4k-spi-test-result.bin

dd if=/dev/urandom of=16bytes-spi-test-data.bin bs=1 count=16
spidev_test -D "$device" -s 16000 -i 16bytes-spi-test-data.bin -o 16bytes-spi-test-result.bin
```

with "$device" being your actual spidev device?

Those tests are passing on 6.7.0-rc2 for me.

Francesco