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

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Date:   Wed, 14 Sep 2016 06:28:03 +0000
From:   "Winkler, Tomas" <tomas.winkler@...el.com>
To:     "jarkko.sakkinen@...ux.intel.com" <jarkko.sakkinen@...ux.intel.com>,
        "jgunthorpe@...idianresearch.com" <jgunthorpe@...idianresearch.com>,
        "tpmdd-devel@...ts.sourceforge.net" 
        <tpmdd-devel@...ts.sourceforge.net>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 0/4] tpm/tpm_crb: implement power management.

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?

Thanks
Tomas