linux-kernel - Re: [PATCH v4 1/6] tpm: Add a flag to indicate TPM power is managed by firmware

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Message-ID: <20190815203433.fygcoj3arv5tpoz5@linux.intel.com>
Date:   Thu, 15 Aug 2019 23:34:33 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Peter Huewe <peterhuewe@....de>, linux-kernel@...r.kernel.org,
        linux-integrity@...r.kernel.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>
Subject: Re: [PATCH v4 1/6] tpm: Add a flag to indicate TPM power is managed
 by firmware

On Mon, Aug 12, 2019 at 03:36:17PM -0700, Stephen Boyd wrote:
> 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.
> 
> Cc: Andrey Pronin <apronin@...omium.org>
> Cc: Duncan Laurie <dlaurie@...omium.org>
> Cc: Jason Gunthorpe <jgg@...pe.ca>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Guenter Roeck <groeck@...omium.org>
> Cc: Alexander Steffen <Alexander.Steffen@...ineon.com>
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>

LGTM

Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>

/Jarkko