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>
diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index 0a475c7..533ae35 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -534,6 +534,7 @@
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 @@
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;