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From: <Alexander.Steffen-d0qZbvYSIPpWk0Htik3J/>
Subject: Re: About the SLB9670 TPM 2.0 driver status
Date: Wed, 26 Apr 2017 16:04:27 +0000	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

> I am working with on Infineon SLB9670 TPM 2.0 on SPI.
> How well is this chip supported in the mainline kernel?

Unfortunately, due to some small bugs, tpm_tis_spi in mainline is not yet compatible with this device. Starting with 4.12 it should be properly supported.

> I am currently using the linux-socfpga kernel (version 4.8.0; branch
> socfpga-4.8) [1]
> on which I applied the following patches from patchwork:
> aacabbe0d5ec tpm_tis_spi: Add small delay after last transfer [2]
> a4a011be786f tpm_tis_spi: Remove limitation of transfers to
> 840157e08b2f tpm_tis_spi: Check correct byte for wait state indicator [4]
> 10cb31aec536 tpm_tis_spi: Abort transfer when too many wait states are
> signaled [5]
> 3ad7d9172a8c tpm_tis_spi: Use single function to transfer data [6]
> 4a809ec34a0f tpm_tis_core: Choose appropriate timeout for reading
> burstcount [7]
> With these patches, I can read the Vendor ID properly.

Those are all the patches that I needed on a Raspberry Pi 2 for the device to work correctly. I did not use 4.8 though, but worked with 4.10.

> But, the driver initialization fails in the tpm2_probe function.

Could you be more specific? What exactly fails? What data is transferred to/from the TPM when it fails?

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  parent reply	other threads:[~2017-04-26 16:04 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-26  2:12 About the SLB9670 TPM 2.0 driver status Georges Savoundararadj
     [not found] ` <>
2017-04-26 10:37   ` Jarkko Sakkinen
2017-04-26 16:04   ` Alexander.Steffen-d0qZbvYSIPpWk0Htik3J/w [this message]
     [not found]     ` <a5616ca471a64e5ab4809a231966987b-nFblLGNE8XKJSz+rYg/>
2017-04-26 18:47       ` Georges Savoundararadj
     [not found]         ` <>
2017-04-27 15:40           ` Alexander.Steffen-d0qZbvYSIPpWk0Htik3J/w
     [not found]             ` <4b9a97a8d4164d0b9fa8d8c99618b7fc-nFblLGNE8XKJSz+rYg/>
2017-04-27 23:36               ` Georges Savoundararadj

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