linux-kernel - Re: [PATCH v2] tpm: fix suspend/resume paths for TPM 2.0

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Date:	Mon, 2 Feb 2015 21:20:03 +0200
From:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:	Scot Doyle <lkml14@...tdoyle.com>
Cc:	Peter Huewe <peterhuewe@....de>, Ashley Lai <ashley@...leylai.com>,
	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	josh@...htriplett.org, christophe.ricard@...il.com,
	jason.gunthorpe@...idianresearch.com, stefanb@...ux.vnet.ibm.com,
	linux-api@...r.kernel.org, trousers-tech@...ts.sourceforge.net
Subject: Re: [PATCH v2] tpm: fix suspend/resume paths for TPM 2.0

Are we good with this?

/Jarkko

On Thu, Jan 29, 2015 at 06:43:12PM +0000, Scot Doyle wrote:
> 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@....de>
> > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.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@...tdoyle.com>

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