Commit 419a16d9 authored by Maciej S. Szmigiero's avatar Maciej S. Szmigiero Committed by Jarkko Sakkinen

tpm_tis: fix iTPM probe via probe_itpm() function

probe_itpm() function is supposed to send command without an itpm flag set
and if this fails to repeat it, this time with the itpm flag set.

However, commit 41a5e1cf ("tpm/tpm_tis: Split tpm_tis driver into a
core and TCG TIS compliant phy") moved the itpm flag from an "itpm"
variable to a TPM_TIS_ITPM_POSSIBLE chip flag, so setting the
(now function-local) itpm variable no longer had any effect.

Finally, this function-local itpm variable was removed by
commit 56af3221 ("tpm/tpm_tis: remove unused itpm variable")

Tested only on non-iTPM TIS TPM.
Signed-off-by: default avatarMaciej S. Szmigiero <mail@maciej.szmigiero.name>
Reviewed-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
parent fa2825da
......@@ -464,6 +464,9 @@ static int probe_itpm(struct tpm_chip *chip)
size_t len = sizeof(cmd_getticks);
u16 vendor;
if (priv->flags & TPM_TIS_ITPM_WORKAROUND)
return 0;
rc = tpm_tis_read16(priv, TPM_DID_VID(0), &vendor);
if (rc < 0)
return rc;
......@@ -479,12 +482,15 @@ static int probe_itpm(struct tpm_chip *chip)
tpm_tis_ready(chip);
release_locality(chip, priv->locality, 0);
priv->flags |= TPM_TIS_ITPM_WORKAROUND;
rc = tpm_tis_send_data(chip, cmd_getticks, len);
if (rc == 0) {
if (rc == 0)
dev_info(&chip->dev, "Detected an iTPM.\n");
rc = 1;
} else
else {
priv->flags &= ~TPM_TIS_ITPM_WORKAROUND;
rc = -EFAULT;
}
out:
tpm_tis_ready(chip);
......@@ -741,15 +747,10 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
(chip->flags & TPM_CHIP_FLAG_TPM2) ? "2.0" : "1.2",
vendor >> 16, rid);
if (!(priv->flags & TPM_TIS_ITPM_WORKAROUND)) {
probe = probe_itpm(chip);
if (probe < 0) {
rc = -ENODEV;
goto out_err;
}
if (!!probe)
priv->flags |= TPM_TIS_ITPM_WORKAROUND;
probe = probe_itpm(chip);
if (probe < 0) {
rc = -ENODEV;
goto out_err;
}
/* Figure out the capabilities */
......
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