linux-kernel - Re: [PATCH AUTOSEL 5.4 277/350] tpm: Add a flag to indicate TPM power is managed by firmware

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Date:   Wed, 11 Dec 2019 10:05:52 -0800
From:   Guenter Roeck <groeck@...gle.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     Sasha Levin <sashal@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "# v4 . 10+" <stable@...r.kernel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Andrey Pronin <apronin@...omium.org>,
        Duncan Laurie <dlaurie@...omium.org>,
        Jason Gunthorpe <jgg@...pe.ca>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <groeck@...omium.org>,
        Alexander Steffen <Alexander.Steffen@...ineon.com>,
        Heiko Stuebner <heiko@...ech.de>,
        linux-integrity@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 5.4 277/350] tpm: Add a flag to indicate TPM power
 is managed by firmware

On Wed, Dec 11, 2019 at 9:57 AM Jarkko Sakkinen
<jarkko.sakkinen@...ux.intel.com> wrote:
>
> On Tue, Dec 10, 2019 at 01:32:15PM -0800, Guenter Roeck wrote:
> > On Tue, Dec 10, 2019 at 1:12 PM Sasha Levin <sashal@...nel.org> wrote:
> > >
> > > From: Stephen Boyd <swboyd@...omium.org>
> > >
> > > [ Upstream commit 2e2ee5a2db06c4b81315514b01d06fe5644342e9 ]
> > >
> > > On some platforms, the TPM power is managed by firmware and therefore we
> > > don't need to stop the TPM on suspend when going to a light version of
> > > suspend such as S0ix ("freeze" suspend state). Add a chip flag,
> > > TPM_CHIP_FLAG_FIRMWARE_POWER_MANAGED, to indicate this so that certain
> > > platforms can probe for the usage of this light suspend and avoid
> > > touching the TPM state across suspend/resume.
> > >
> >
> > Are the patches needed to support CR50 (which need this patch) going
> > to be applied to v5.4.y as well ? If not, what is the purpose of
> > applying this patch to v5.4.y ?
> >
> > Thanks,
> > Guenter
>
> Thanks Guenter. I think not.
>
Thought so. In that case this patch should be dropped.

Guenter