linux-kernel - Re: [PATCH v3 0/4] tpm/tpm_crb: implement power management.

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Message-ID: <20160914160602.GB11131@intel.com>
Date:   Wed, 14 Sep 2016 19:06:02 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     "Winkler, Tomas" <tomas.winkler@...el.com>
Cc:     "jgunthorpe@...idianresearch.com" <jgunthorpe@...idianresearch.com>,
        "tpmdd-devel@...ts.sourceforge.net" 
        <tpmdd-devel@...ts.sourceforge.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 0/4] tpm/tpm_crb: implement power management.

On Wed, Sep 14, 2016 at 06:28:03AM +0000, Winkler, Tomas wrote:
> On Mon, 2016-09-12 at 16:04 +0300, Tomas Winkler wrote:
> > Te overall platform ability to enter a low power state is also
> > conditioned on the ability of a tpm device to go to idle state.
> > This series should provide this feature.
> > 
> > Unfortunately, there is a HW bug on Intel PTT devices on Skylake,
> > Kabylake, and Broxton devices, where certain registers lost retention
> > during TPM idle state. Hence this implementation takes this into
> > consideration and implement the feature based only on access to
> > registers that retain their state. This still conforms to the spec
> > and should be correct also on non Intle devices.
> > 
> > V2: Utilize runtime_pm for driving tpm crb idle states.
> > V3. fix lower case corruption in the first patch
> > 
> Jarkko, had you chance to test v3 series one on your side, is this okay
> to go?

Opens for me are:

- pm_runtime_put_sync() is still used 
- callback names
- wait_for_tpm_stat

> Thanks
> Tomas

/Jarkko