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tpm: do not suspend/resume if power stays on

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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>
This commit is contained in:
Enric Balletbo i Serra 2017-06-27 12:27:24 +02:00 committed by James Morris
parent 28707bf221
commit b5d0ebc99b
3 changed files with 7 additions and 0 deletions
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3
drivers/char/tpm/tpm-interface.c
View File

@ -1119,6 +1119,9 @@ 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;

1
drivers/char/tpm/tpm.h
View File

@ -174,6 +174,7 @@ 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 {

3
drivers/char/tpm/tpm_of.c
View File

@ -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)