linux-kernel - tpm_tis_spi takes minutes to probe

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Date: Fri, 17 May 2024 15:53:22 +0100
From: Vitor Soares <ivitro@...il.com>
To: linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: jgg@...pe.ca, jarkko@...nel.org, peterhuewe@....de,
 vitor.soares@...adex.com
Subject: tpm_tis_spi takes minutes to probe

Greetings,

I'm using the tpm_tis_spi.ko module and it is taking several minutes to probe on
kernel:
 - commit ea5f6ad9ad96 ("Merge tag 'platform-drivers-x86-v6.10-1' of
git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86")

root@...din-imx8mm-07317726:~# time modprobe tpm_tis_spi 
[   57.534597] SPI driver tpm_tis_spi has no spi_device_id for atmel,attpm20p
[   57.560684] tpm_tis_spi spi2.1: 2.0 TPM (device-id 0x3205, rev-id 1)
[   57.584943] tpm tpm0: A TPM error (256) occurred attempting the self test
[   57.591797] tpm tpm0: starting up the TPM manually
real    8m6.438s
user    0m0.007s
sys     0m0.013s

..And after probing, sometimes the system becames unresponsive.


I did the same test with kernel:
 - commit a38297e3fb01 ("Linux 6.9")

root@...din-imx8mm-07317726:~# time modprobe tpm_tis_spi
[   53.643744] SPI driver tpm_tis_spi has no spi_device_id for atmel,attpm20p
[   53.668404] tpm_tis_spi spi2.1: 2.0 TPM (device-id 0x3205, rev-id 1)
[   53.692997] tpm tpm0: A TPM error (256) occurred attempting the self test
[   53.699879] tpm tpm0: starting up the TPM manually

real    0m2.809s
user    0m0.001s
sys     0m0.022s

I tested on kernel v6.8 and same it takes same time. Do you know anything about
this?

Best regards,
Vitor Soares