From e934acca1ee993e1d99d7dc203569a6e5cdfb392 Mon Sep 17 00:00:00 2001 From: Stefan Berger Date: Wed, 30 Mar 2011 12:13:24 -0400 Subject: 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: Stefan Berger Signed-off-by: Rajiv Andrade --- drivers/char/tpm/tpm.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) (limited to 'drivers') diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c index aebb4b5a199c..277cf22609ca 100644 --- a/drivers/char/tpm/tpm.c +++ b/drivers/char/tpm/tpm.c @@ -583,17 +583,22 @@ duration: 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); -- cgit v1.2.3