diff options
Diffstat (limited to 'drivers/char/tpm/tpm_tis_core.c')
| -rw-r--r-- | drivers/char/tpm/tpm_tis_core.c | 30 |
1 files changed, 16 insertions, 14 deletions
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c index 7993678954a2..c0f296b5d413 100644 --- a/drivers/char/tpm/tpm_tis_core.c +++ b/drivers/char/tpm/tpm_tis_core.c @@ -264,7 +264,7 @@ static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len) struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); int rc, status, burstcnt; size_t count = 0; - bool itpm = priv->flags & TPM_TIS_ITPM_POSSIBLE; + bool itpm = priv->flags & TPM_TIS_ITPM_WORKAROUND; if (request_locality(chip, 0) < 0) return -EBUSY; @@ -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); @@ -552,7 +558,8 @@ static int tpm_tis_gen_interrupt(struct tpm_chip *chip) if (chip->flags & TPM_CHIP_FLAG_TPM2) return tpm2_get_tpm_pt(chip, 0x100, &cap2, desc); else - return tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc); + return tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc, + 0); } /* Register the IRQ and issue a command that will cause an interrupt. If an @@ -740,15 +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_POSSIBLE)) { - probe = probe_itpm(chip); - if (probe < 0) { - rc = -ENODEV; - goto out_err; - } - - if (!!probe) - priv->flags |= TPM_TIS_ITPM_POSSIBLE; + probe = probe_itpm(chip); + if (probe < 0) { + rc = -ENODEV; + goto out_err; } /* Figure out the capabilities */ |