[PATCH 1/2] tpm: do not suspend/resume if power stays on
Jarkko Sakkinen <[email protected]>
| Newsgroups | net.sourceforge.lists.tpmdd-devel,org.kernel.vger.linux-kernel,org.kernel.vger.stable |
|---|---|
| Message-ID | <[email protected]> |
From: Enric Balletbo i Serra <[email protected]> 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 <[email protected]> Signed-off-by: Enric Balletbo i Serra <[email protected]> Reviewed-by: Jason Gunthorpe <[email protected]> Reviewed-by: Jarkko Sakkinen <[email protected]> Signed-off-by: Jarkko Sakkinen <[email protected]> Signed-off-by: James Morris <[email protected]> --- 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 aaa5fa95dede..247dd2b6504a 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -931,6 +931,9 @@ 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 772d99b3a8e4..36e1abda00f9 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -168,6 +168,7 @@ struct tpm_vendor_specific { enum tpm_chip_flags { TPM_CHIP_FLAG_REGISTERED = BIT(0), TPM_CHIP_FLAG_TPM2 = BIT(1), + TPM_CHIP_FLAG_ALWAYS_POWERED = BIT(5), }; struct tpm_chip { diff --git a/drivers/char/tpm/tpm_of.c b/drivers/char/tpm/tpm_of.c index 570f30c5c5f4..669f4a046398 100644 --- a/drivers/char/tpm/tpm_of.c +++ b/drivers/char/tpm/tpm_of.c @@ -37,6 +37,9 @@ int read_log(struct tpm_bios_log *log) 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); if (sizep == NULL) { pr_err("%s: ERROR - SML size not found\n", __func__); -- 2.17.0