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Subject[PATCH v2 1/2] tpm: do not suspend/resume if power stays on
Date
From: Enric Balletbo i Serra <enric.balletbo@collabora.com>

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>
---
drivers/char/tpm/tpm-chip.c | 12 ++++++++++++
drivers/char/tpm/tpm-interface.c | 3 +++
drivers/char/tpm/tpm.h | 1 +
3 files changed, 16 insertions(+)

diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index a0d9ac6b6cc9..a8d7220f613c 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -324,8 +324,20 @@ static void tpm1_chip_unregister(struct tpm_chip *chip)
*/
int tpm_chip_register(struct tpm_chip *chip)
{
+#ifdef CONFIG_TCG_IBMVTPM
+ struct device_node *np;
+#endif
int rc;

+#ifdef CONFIG_TCG_IBMVTPM
+ np = of_find_node_by_name(NULL, "vtpm");
+ if (!np)
+ return -ENODEV;
+ if (of_property_read_bool(np, "powered-while-suspended"))
+ chip->flags |= TPM_CHIP_FLAG_ALWAYS_POWERED;
+ of_node_put(np);
+#endif
+
rc = tpm1_chip_register(chip);
if (rc)
return rc;
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 {
--
2.17.0
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