| Message ID | 20170627102724.23861-2-enric.balletbo@collabora.com |
|---|---|
| State | New |
| Headers | show |
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@chromium.org> > Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> > Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> > Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> > --- > 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 ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot
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)