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List:       linux-api
Subject:    Re: [PATCH v2] tpm: fix suspend/resume paths for TPM 2.0
From:       Scot Doyle <lkml14 () scotdoyle ! com>
Date:       2015-01-29 18:43:12
Message-ID: alpine.DEB.2.11.1501291832460.1678 () localhost ! localdomain
[Download RAW message or body]

On Thu, 29 Jan 2015, Jarkko Sakkinen wrote:
> Fixed suspend/resume paths for TPM 2.0 and consolidated all the
> associated code to the tpm_pm_suspend() and tpm_pm_resume()
> functions. Resume path should be handled by the firmware, i.e.
> Startup(CLEAR) for hibernate and Startup(STATE) for suspend.
> 
> There might be some non-PC embedded devices in the future where
> Startup() is not the handled by the FW but fixing the code for
> those IMHO should be postponed until there is hardware available
> to test the fixes although extra Startup in the driver code is
> essentially a NOP.
> 
> Added Shutdown(CLEAR) to the remove paths of TIS and CRB drivers.
> Changed tpm2_shutdown() to a void function because there isn't
> much you can do except print an error message if this fails with
> a system error.
> 
> Reported-by: Peter Hüwe <PeterHuewe@gmx.de>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> ---
>  drivers/char/tpm/tpm-interface.c |  6 ++++--
>  drivers/char/tpm/tpm.h           |  2 +-
>  drivers/char/tpm/tpm2-cmd.c      | 19 +++++++++++--------
>  drivers/char/tpm/tpm_crb.c       | 20 +++++---------------
>  drivers/char/tpm/tpm_tis.c       | 26 +++++++++++++-------------
>  5 files changed, 34 insertions(+), 39 deletions(-)

Resume still functions on TPM 1.2 chip, with and without CONFIG_TCG_CRB.

Tested-by: Scot Doyle <lkml14@scotdoyle.com>
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