linux-kernel - Re: TPM driver breaks S3 suspend

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Message-ID: <20171221161728.GB20015@ziepe.ca>
Date:   Thu, 21 Dec 2017 09:17:28 -0700
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Alexander.Steffen@...ineon.com
Cc:     chiu@...lessm.com, peterhuewe@....de,
        jarkko.sakkinen@...ux.intel.com, linux-integrity@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux@...lessm.com
Subject: Re: TPM driver breaks S3 suspend

On Thu, Dec 21, 2017 at 10:19:09AM +0000, Alexander.Steffen@...ineon.com wrote:

> The correct solution should be something like tpm2_auto_startup
> (execute selftests, if they fail because of the missing startup
> command, execute that and retry the selftests). Interestingly,
> tpm1_auto_startup (same purpose as tpm2_auto_startup, but for TPM
> 1.2 instead) does not use the same sequence, the startup-retry part
> is missing. Is there any reason this is done differently for TPM
> 1.2?

No TPM 1.2 has needed the retry loop so far.. don't see any problem
with adding it if the spec supports it.

Jason