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Commit e934acca authored by Stefan Berger's avatar Stefan Berger Committed by Rajiv Andrade
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tpm: Adjust the durations if they are too small 



Adjust the durations if they are found to be too small, i.e., if they are
returned in milliseconds rather than microseconds as some Infineon TPMs are
reported to do.

Signed-off-by: default avatarStefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: default avatarRajiv Andrade <srajiv@linux.vnet.ibm.com>
parent 979b1406

drivers/char/tpm/tpm.c

+11 −6
Original line number Diff line number Diff line
@@ -583,17 +583,22 @@ void tpm_get_timeouts(struct tpm_chip *chip) 
	duration_cap = &tpm_cmd.params.getcap_out.cap.duration;

	chip->vendor.duration[TPM_SHORT] =

	    usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));

	chip->vendor.duration[TPM_MEDIUM] =

	    usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));

	chip->vendor.duration[TPM_LONG] =

	    usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));



	/* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above

	 * value wrong and apparently reports msecs rather than usecs. So we

	 * fix up the resulting too-small TPM_SHORT value to make things work.

	 * We also scale the TPM_MEDIUM and -_LONG values by 1000.

	 */

	if (chip->vendor.duration[TPM_SHORT] < (HZ/100))

	if (chip->vendor.duration[TPM_SHORT] < (HZ / 100)) {

		chip->vendor.duration[TPM_SHORT] = HZ;



	chip->vendor.duration[TPM_MEDIUM] =

	    usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));

	chip->vendor.duration[TPM_LONG] =

	    usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));

		chip->vendor.duration[TPM_MEDIUM] *= 1000;

		chip->vendor.duration[TPM_LONG] *= 1000;

		dev_info(chip->dev, "Adjusting TPM timeout parameters.");

	}

}

EXPORT_SYMBOL_GPL(tpm_get_timeouts);