diff options
| author | Enric Balletbo i Serra <enric.balletbo@collabora.com> | 2017-06-27 12:27:24 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-06-13 16:16:40 +0200 |
| commit | d6313fe3ab2dbe04b7fff2c3aee55d20b1b2bdb0 (patch) | |
| tree | 1de231885dd9abd6fb58f9f9f826cc9595e3ab2c /drivers/char | |
| parent | 3c3d05fc6e6653bdf9f7fb3fb6922b199c7ba3ec (diff) | |
tpm: do not suspend/resume if power stays on
commit b5d0ebc99bf5d0801a5ecbe958caa3d68b8eaee8 upstream.
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>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/tpm/tpm-chip.c | 13 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm-interface.c | 3 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm.h | 1 |
3 files changed, 17 insertions, 0 deletions
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c index 9ff853229957..8d097d10fd13 100644 --- a/drivers/char/tpm/tpm-chip.c +++ b/drivers/char/tpm/tpm-chip.c @@ -26,6 +26,7 @@ #include <linux/spinlock.h> #include <linux/freezer.h> #include <linux/major.h> +#include <linux/of.h> #include "tpm.h" #include "tpm_eventlog.h" @@ -388,8 +389,20 @@ static int tpm_add_legacy_sysfs(struct tpm_chip *chip) */ int tpm_chip_register(struct tpm_chip *chip) { +#ifdef CONFIG_OF + struct device_node *np; +#endif int rc; +#ifdef CONFIG_OF + np = of_find_node_by_name(NULL, "vtpm"); + if (np) { + if (of_property_read_bool(np, "powered-while-suspended")) + chip->flags |= TPM_CHIP_FLAG_ALWAYS_POWERED; + } + of_node_put(np); +#endif + if (chip->ops->flags & TPM_OPS_AUTO_STARTUP) { if (chip->flags & TPM_CHIP_FLAG_TPM2) rc = tpm2_auto_startup(chip); diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index 830d7e30e508..5463b649bdf1 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -969,6 +969,9 @@ 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 aa4299cf7e5a..a4fc2badf633 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -143,6 +143,7 @@ enum tpm_chip_flags { TPM_CHIP_FLAG_TPM2 = BIT(1), TPM_CHIP_FLAG_IRQ = BIT(2), TPM_CHIP_FLAG_VIRTUAL = BIT(3), + TPM_CHIP_FLAG_ALWAYS_POWERED = BIT(5), }; struct tpm_chip { |