Currently, tpm_msleep() uses delay_msec as the minimum value in
usleep_range. However, that is the maximum time we want to wait.
The function is modified to use the delay_msec as the maximum
value, not the minimum value.
After this change, performance on a TPM 1.2 with an 8 byte
burstcount for 1000 extends improved from ~9sec to ~8sec.
Fixes: 3b9af007869("tpm: replace msleep() with usleep_range() in TPM 1.2/
2.0 generic drivers")
Signed-off-by: Nayna Jain <na...@linux.vnet.ibm.com>
Acked-by: Mimi Zohar <zo...@linux.vnet.ibm.com>
Tested-by: Jarkko Sakkinen <jarkko.sakki...@linux.intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakki...@linux.intel.com>
---
drivers/char/tpm/tpm.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 4fc83ac7abeb..644de70de2cc 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -528,8 +528,8 @@ int tpm_pm_resume(struct device *dev);
static inline void tpm_msleep(unsigned int delay_msec)
{
- usleep_range(delay_msec * 1000,
- (delay_msec * 1000) + TPM_TIMEOUT_RANGE_US);
+ usleep_range((delay_msec * 1000) - TPM_TIMEOUT_RANGE_US,
+ delay_msec * 1000);
};
struct tpm_chip *tpm_chip_find_get(int chip_num);
--
2.13.3
