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authorStefan Berger <stefanb@linux.vnet.ibm.com>2011-03-30 12:13:27 -0400
committerRajiv Andrade <srajiv@linux.vnet.ibm.com>2011-07-12 18:53:07 -0300
commite3e1a1e169d4e7f73c60ded937ebe24526bc6427 (patch)
tree7851fd1700d3c40d5c03be60bb5c8942cb64b061 /drivers/char/tpm
parent829bf0675272d24ba0056f5f79e09544464f0c8d (diff)
tpm: Adjust interface timeouts if they are too small
Adjust the interface timeouts if they are found to be too small, i.e., if they are returned in milliseconds rather than microseconds as we heared from Infineon that some (old) Infineon TPMs do. Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com> Signed-off-by: Rajiv Andrade <srajiv@linux.vnet.ibm.com>
Diffstat (limited to 'drivers/char/tpm')
-rw-r--r--drivers/char/tpm/tpm.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index 0a475c7fe5c..533ae359cb2 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -534,6 +534,7 @@ void tpm_get_timeouts(struct tpm_chip *chip)
struct duration_t *duration_cap;
ssize_t rc;
u32 timeout;
+ unsigned int scale = 1;
tpm_cmd.header.in = tpm_getcap_header;
tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
@@ -553,17 +554,21 @@ void tpm_get_timeouts(struct tpm_chip *chip)
timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
/* Don't overwrite default if value is 0 */
timeout = be32_to_cpu(timeout_cap->a);
+ if (timeout && timeout < 1000) {
+ /* timeouts in msec rather usec */
+ scale = 1000;
+ }
if (timeout)
- chip->vendor.timeout_a = usecs_to_jiffies(timeout);
+ chip->vendor.timeout_a = usecs_to_jiffies(timeout * scale);
timeout = be32_to_cpu(timeout_cap->b);
if (timeout)
- chip->vendor.timeout_b = usecs_to_jiffies(timeout);
+ chip->vendor.timeout_b = usecs_to_jiffies(timeout * scale);
timeout = be32_to_cpu(timeout_cap->c);
if (timeout)
- chip->vendor.timeout_c = usecs_to_jiffies(timeout);
+ chip->vendor.timeout_c = usecs_to_jiffies(timeout * scale);
timeout = be32_to_cpu(timeout_cap->d);
if (timeout)
- chip->vendor.timeout_d = usecs_to_jiffies(timeout);
+ chip->vendor.timeout_d = usecs_to_jiffies(timeout * scale);
duration:
tpm_cmd.header.in = tpm_getcap_header;