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tpm_tis: use default timeout value if chip reports it as zero

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Since commit 1107d065fd ("tpm_tis: Introduce intermediate layer for
TPM access") Atmel 3203 TPM on ThinkPad X61S (TPM firmware version 13.9)
no longer works.  The initialization proceeds fine until we get and
start using chip-reported timeouts - and the chip reports C and D
timeouts of zero.

It turns out that until commit 8e54caf407 ("tpm: Provide a generic
means to override the chip returned timeouts") we had actually let
default timeout values remain in this case, so let's bring back this
behavior to make chips like Atmel 3203 work again.

Use a common code that was introduced by that commit so a warning is
printed in this case and /sys/class/tpm/tpm*/timeouts correctly says the
timeouts aren't chip-original.

Fixes: 1107d065fd ("tpm_tis: Introduce intermediate layer for TPM access")
Cc: stable@vger.kernel.org
Signed-off-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
This commit is contained in:
Maciej S. Szmigiero
2017-01-13 22:37:00 +01:00
committed by Jarkko Sakkinen
parent 62bfdacbac
commit 1d70fe9d9c
4 changed files with 37 additions and 26 deletions
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2
drivers/char/tpm/tpm_tis.c
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@@ -159,7 +159,7 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
irq = tpm_info->irq;
if (itpm)
phy->priv.flags |= TPM_TIS_ITPM_POSSIBLE;
phy->priv.flags |= TPM_TIS_ITPM_WORKAROUND;
return tpm_tis_core_init(dev, &phy->priv, irq, &tpm_tcg,
acpi_dev_handle);