linux-kernel - Re: TPM driver breaks S3 suspend

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Message-ID: <20171224203751.2cyemyq7ugy3uquy@linux.intel.com>
Date:   Sun, 24 Dec 2017 22:37:51 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Alexander.Steffen@...ineon.com
Cc:     chiu@...lessm.com, peterhuewe@....de, jgg@...pe.ca,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux@...lessm.com
Subject: Re: TPM driver breaks S3 suspend

> 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?
> Otherwise I'd propose to make tpm1_auto_startup follow the same
> sequence as tpm2_auto_startup and then call both from tpm_tis_resume,
> similar to what tpm_chip_register does.

I think the reason for that is that such regression has never reported
on TPM 1.2 platform. No other reason.

/Jarkko