linux-kernel - Re: spi: imx: Increase imx51 ecspi burst length fails on imx6dl and imx8mm

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Date:   Sat, 25 Nov 2023 23:44:32 +0100
From:   Benjamin Bigler <benjamin@...ler.one>
To:     francesco@...cini.it
Cc:     broonie@...nel.org, linux-kernel@...r.kernel.org,
        linux-spi@...r.kernel.org, linux@...ler.io,
        regressions@...ts.linux.dev, stefan.moring@...hnolution.nl
Subject: Re: spi: imx: Increase imx51 ecspi burst length fails on imx6dl and
 imx8mm

Hello,

I'm uncertain whether this is the appropriate place to respond, but I
am encountering a similar issue on a phyboard-polis-rdk (imx8mm) with
Linux 6.7-rc2. My system uses the imx-sdma firmware version 4.6.

The problem is with the TPM, which fails to function correctly,
displaying the error message:
"tpm tpm0: TPM in field failure mode, requires firmware upgrade."

The issue is identical to the one reported by Stefan. It can be
resolved by reverting commits 15a6af94a2779d5dfb42ee4bfac858ea8e964a3f
and 5f66db08cbd3ca471c66bacb0282902c79db9274, after which the TPM works
again.

Additionally, I've conducted the tests which Francesco mentioned:

> ```
> 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
> ```

The readback data is correct but on MOSI/MISO there are 16384 bytes.

Please let me know if I can do some more tests.

Best regards,

Benjamin Bigler