[PATCH v4 RESEND 1/2] Documentation: tpm: add powered-while-suspended binding documentation

[PATCH v4 RESEND 1/2] Documentation: tpm: add powered-while-suspended binding documentation

[Enric Balletbo i Serra]

Add a new powered-while-suspended property to control the behavior of the
TPM suspend/resume.

Signed-off-by: Enric Balletbo i Serra <enric.balletbo-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org>
Signed-off-by: Sonny Rao <sonnyrao-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
Reviewed-by: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
Changes since v3.
  - Rebased on top of linux-next
 Rob Herring
  - Split DT binding from code patch as is preferred. 

Did not exist on previous versions.

 Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt b/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt
index 8cb638b..85c8216 100644
--- a/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt
+++ b/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt
@@ -8,6 +8,12 @@ Required properties:
                    the firmware event log
 - linux,sml-size : size of the memory allocated for the firmware event log
 
+Optional properties:
+
+- powered-while-suspended: present when the TPM is left powered on between
+                           suspend and resume (makes the suspend/resume
+                           callbacks do nothing).
+
 Example (for OpenPower Systems with Nuvoton TPM 2.0 on I2C)
 ----------------------------------------------------------
 
-- 
2.9.3

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[PATCH v4 RESEND 2/2] tpm: do not suspend/resume if power stays on

[Enric Balletbo i Serra]

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


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Re: [PATCH v4 RESEND 2/2] tpm: do not suspend/resume if power stays on

[Jarkko Sakkinen]

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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Re: [PATCH v4 RESEND 1/2] Documentation: tpm: add powered-while-suspended binding documentation

[Jarkko Sakkinen]

On Tue, Jun 27, 2017 at 12:27:23PM +0200, Enric Balletbo i Serra wrote:
> Add a new powered-while-suspended property to control the behavior of the
> TPM suspend/resume.
> 
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org>
> Signed-off-by: Sonny Rao <sonnyrao-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
> Reviewed-by: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
> Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> ---
> Changes since v3.
>   - Rebased on top of linux-next
>  Rob Herring
>   - Split DT binding from code patch as is preferred. 
> 
> Did not exist on previous versions.
> 
>  Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt b/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt
> index 8cb638b..85c8216 100644
> --- a/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt
> +++ b/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt
> @@ -8,6 +8,12 @@ Required properties:
>                     the firmware event log
>  - linux,sml-size : size of the memory allocated for the firmware event log
>  
> +Optional properties:
> +
> +- powered-while-suspended: present when the TPM is left powered on between
> +                           suspend and resume (makes the suspend/resume
> +                           callbacks do nothing).
> +
>  Example (for OpenPower Systems with Nuvoton TPM 2.0 on I2C)
>  ----------------------------------------------------------
>  
> -- 
> 2.9.3
> 

So... should I apply this?

/Jarkko
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Re: [PATCH v4 RESEND 1/2] Documentation: tpm: add powered-while-suspended binding documentation

[Sonny Rao]

On Mon, Jul 3, 2017 at 5:57 AM, Jarkko Sakkinen
<jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org> wrote:
> On Tue, Jun 27, 2017 at 12:27:23PM +0200, Enric Balletbo i Serra wrote:
>> Add a new powered-while-suspended property to control the behavior of the
>> TPM suspend/resume.
>>
>> Signed-off-by: Enric Balletbo i Serra <enric.balletbo-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org>
>> Signed-off-by: Sonny Rao <sonnyrao-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
>> Reviewed-by: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
>> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
>> Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
>> ---
>> Changes since v3.
>>   - Rebased on top of linux-next
>>  Rob Herring
>>   - Split DT binding from code patch as is preferred.
>>
>> Did not exist on previous versions.
>>
>>  Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt | 6 ++++++
>>  1 file changed, 6 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt b/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt
>> index 8cb638b..85c8216 100644
>> --- a/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt
>> +++ b/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt
>> @@ -8,6 +8,12 @@ Required properties:
>>                     the firmware event log
>>  - linux,sml-size : size of the memory allocated for the firmware event log
>>
>> +Optional properties:
>> +
>> +- powered-while-suspended: present when the TPM is left powered on between
>> +                           suspend and resume (makes the suspend/resume
>> +                           callbacks do nothing).
>> +
>>  Example (for OpenPower Systems with Nuvoton TPM 2.0 on I2C)
>>  ----------------------------------------------------------
>>
>> --
>> 2.9.3
>>
>
> So... should I apply this?

Hi, since you applied the code part, it would make sense to apply the
documentation too.

>
> /Jarkko
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Re: [PATCH v4 RESEND 1/2] Documentation: tpm: add powered-while-suspended binding documentation

[Jarkko Sakkinen]

On Wed, Jul 05, 2017 at 10:19:02AM -0700, Sonny Rao wrote:
> On Mon, Jul 3, 2017 at 5:57 AM, Jarkko Sakkinen
> <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org> wrote:
> > On Tue, Jun 27, 2017 at 12:27:23PM +0200, Enric Balletbo i Serra wrote:
> >> Add a new powered-while-suspended property to control the behavior of the
> >> TPM suspend/resume.
> >>
> >> Signed-off-by: Enric Balletbo i Serra <enric.balletbo-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org>
> >> Signed-off-by: Sonny Rao <sonnyrao-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
> >> Reviewed-by: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
> >> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
> >> Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> >> ---
> >> Changes since v3.
> >>   - Rebased on top of linux-next
> >>  Rob Herring
> >>   - Split DT binding from code patch as is preferred.
> >>
> >> Did not exist on previous versions.
> >>
> >>  Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt | 6 ++++++
> >>  1 file changed, 6 insertions(+)
> >>
> >> diff --git a/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt b/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt
> >> index 8cb638b..85c8216 100644
> >> --- a/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt
> >> +++ b/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt
> >> @@ -8,6 +8,12 @@ Required properties:
> >>                     the firmware event log
> >>  - linux,sml-size : size of the memory allocated for the firmware event log
> >>
> >> +Optional properties:
> >> +
> >> +- powered-while-suspended: present when the TPM is left powered on between
> >> +                           suspend and resume (makes the suspend/resume
> >> +                           callbacks do nothing).
> >> +
> >>  Example (for OpenPower Systems with Nuvoton TPM 2.0 on I2C)
> >>  ----------------------------------------------------------
> >>
> >> --
> >> 2.9.3
> >>
> >
> > So... should I apply this?
> 
> Hi, since you applied the code part, it would make sense to apply the
> documentation too.

I can do it.

/Jarkko
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Re: [PATCH v4 RESEND 1/2] Documentation: tpm: add powered-while-suspended binding documentation

[Jarkko Sakkinen]

On Wed, 2017-07-05 at 10:19 -0700, Sonny Rao wrote:
> On Mon, Jul 3, 2017 at 5:57 AM, Jarkko Sakkinen
> <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org> wrote:
> > On Tue, Jun 27, 2017 at 12:27:23PM +0200, Enric Balletbo i Serra
> > wrote:
> > > Add a new powered-while-suspended property to control the
> > > behavior of the
> > > TPM suspend/resume.
> > > 
> > > Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.c
> > > om>
> > > Signed-off-by: Sonny Rao <sonnyrao-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
> > > Reviewed-by: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
> > > Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
> > > Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> > > ---
> > > Changes since v3.
> > >   - Rebased on top of linux-next
> > >  Rob Herring
> > >   - Split DT binding from code patch as is preferred.
> > > 
> > > Did not exist on previous versions.
> > > 
> > >  Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt | 6
> > > ++++++
> > >  1 file changed, 6 insertions(+)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/security/tpm/tpm-
> > > i2c.txt b/Documentation/devicetree/bindings/security/tpm/tpm-
> > > i2c.txt
> > > index 8cb638b..85c8216 100644
> > > --- a/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt
> > > +++ b/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt
> > > @@ -8,6 +8,12 @@ Required properties:
> > >                     the firmware event log
> > >  - linux,sml-size : size of the memory allocated for the firmware
> > > event log
> > > 
> > > +Optional properties:
> > > +
> > > +- powered-while-suspended: present when the TPM is left powered
> > > on between
> > > +                           suspend and resume (makes the
> > > suspend/resume
> > > +                           callbacks do nothing).
> > > +
> > >  Example (for OpenPower Systems with Nuvoton TPM 2.0 on I2C)
> > >  ----------------------------------------------------------
> > > 
> > > --
> > > 2.9.3
> > > 
> > 
> > So... should I apply this?
> 
> Hi, since you applied the code part, it would make sense to apply the
> documentation too.
> 
> > 
> > /Jarkko

Applied. Sorry for the delay.

/Jarkko
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