From: Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
To: Enric Balletbo i Serra
<enric.balletbo-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org>
Cc: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
groeck-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org,
Sonny Rao <sonnyrao-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
Subject: Re: [PATCH v4 RESEND 2/2] tpm: do not suspend/resume if power stays on
Date: Mon, 3 Jul 2017 16:00:50 +0300 [thread overview]
Message-ID: <20170703130050.genolhp2eg4qpkfn@linux.intel.com> (raw)
In-Reply-To: <20170627102724.23861-2-enric.balletbo-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org>
On Tue, Jun 27, 2017 at 12:27:24PM +0200, Enric Balletbo i Serra wrote:
> The suspend/resume behavior of the TPM can be controlled by setting
> "powered-while-suspended" in the DTS. This is useful for the cases
> when hardware does not power-off the TPM.
>
> Signed-off-by: Sonny Rao <sonnyrao-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org>
> Reviewed-by: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
> ---
> Changes since v3.
> - Rebased on top of linux-next
> Rob Herring
> - Split DT binding from code patch as is preferred.
> Changes since v2:
> Jarkko Sakkinen
> - Add a new TPM_CHIP_FLAG_ALWAYS_POWERED flag instead of using a boolean variable.
> - Remove a trailing newline.
> Changes since v1:
> Jason Gunthorpe :
> - Move the code to handle suspend/resume in the common chip code.
>
> drivers/char/tpm/tpm-interface.c | 3 +++
> drivers/char/tpm/tpm.h | 1 +
> drivers/char/tpm/tpm_of.c | 3 +++
> 3 files changed, 7 insertions(+)
>
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index be54159..34ec7ce 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -1099,6 +1099,9 @@ int tpm_pm_suspend(struct device *dev)
> if (chip == NULL)
> return -ENODEV;
>
> + if (chip->flags & TPM_CHIP_FLAG_ALWAYS_POWERED)
> + return 0;
> +
> if (chip->flags & TPM_CHIP_FLAG_TPM2) {
> tpm2_shutdown(chip, TPM2_SU_STATE);
> return 0;
> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
> index af05c14..b44d39c 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -170,6 +170,7 @@ enum tpm_chip_flags {
> TPM_CHIP_FLAG_IRQ = BIT(2),
> TPM_CHIP_FLAG_VIRTUAL = BIT(3),
> TPM_CHIP_FLAG_HAVE_TIMEOUTS = BIT(4),
> + TPM_CHIP_FLAG_ALWAYS_POWERED = BIT(5),
> };
>
> struct tpm_bios_log {
> diff --git a/drivers/char/tpm/tpm_of.c b/drivers/char/tpm/tpm_of.c
> index de57d4a..aadb7f4 100644
> --- a/drivers/char/tpm/tpm_of.c
> +++ b/drivers/char/tpm/tpm_of.c
> @@ -36,6 +36,9 @@ int tpm_read_log_of(struct tpm_chip *chip)
> else
> return -ENODEV;
>
> + if (of_property_read_bool(np, "powered-while-suspended"))
> + chip->flags |= TPM_CHIP_FLAG_ALWAYS_POWERED;
> +
> sizep = of_get_property(np, "linux,sml-size", NULL);
> basep = of_get_property(np, "linux,sml-base", NULL);
> if (sizep == NULL && basep == NULL)
> --
> 2.9.3
Applied.
/Jarkko
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next prev parent reply other threads:[~2017-07-03 13:00 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-27 10:27 [PATCH v4 RESEND 1/2] Documentation: tpm: add powered-while-suspended binding documentation Enric Balletbo i Serra
[not found] ` <20170627102724.23861-1-enric.balletbo-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org>
2017-06-27 10:27 ` [PATCH v4 RESEND 2/2] tpm: do not suspend/resume if power stays on Enric Balletbo i Serra
[not found] ` <20170627102724.23861-2-enric.balletbo-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org>
2017-07-03 13:00 ` Jarkko Sakkinen [this message]
2017-07-03 12:57 ` [PATCH v4 RESEND 1/2] Documentation: tpm: add powered-while-suspended binding documentation Jarkko Sakkinen
[not found] ` <20170703125735.dsrl6bs7ttj27zrt-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-07-05 17:19 ` Sonny Rao
[not found] ` <CAPz6YkWN8jQcJdah8wqM+O-5ST+eZ1qpzQvGerXX_u1Tm6soFg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-07-09 7:04 ` Jarkko Sakkinen
2017-07-16 11:23 ` Jarkko Sakkinen
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