[PATCH v3 0/2] tpm: improving granularity in poll sleep times
From: Nayna Jain
Date: Mon May 07 2018 - 12:07:54 EST
The existing TPM polling code sleeps in each loop iteration for time in
msecs ranging from 1 msecs to 5 msecs. However, many of the TPM commands
complete much faster, resulting in unnecessary delays.
This set of patches identifies such iterations and optimizes the sleep
time. The first patch replaces TPM_POLL_SLEEP with TPM_TIMEOUT_POLL and
moves it from tpm_tis_core.c to tpm.h as an enum with value 1 msecs. The
second patch further reduces the TPM poll sleep time in get_burstcount()
and wait_for_tpm_stat() in tpm_tis_core.c by calling usleep_range()
directly.
The change is only in the polling time, and the maximum timeout is still
maintained the same. Thus, it should not affect the overall existing
behavior.
Changelog:
v3:
tpm: reduce poll sleep time in tpm_transmit()
* added testing platform information
* updated patch description for more clarity on reasoning
tpm: reduce polling time to usecs for even finer granularity
* added testing platform information
* added Jarkko's and Mimi's Reviewed-by
v2:
tpm: reduce poll sleep time in tpm_transmit()
* merged previously defined two patches into this.
* updated patch description as per Jarkko's feedback
tpm: reduce polling time to usecs for even finer granularity
* directly use usleep_range with finer granularity less than 1msec
Nayna Jain (2):
tpm: reduce poll sleep time in tpm_transmit()
tpm: reduce polling time to usecs for even finer granularity
drivers/char/tpm/tpm-interface.c | 2 +-
drivers/char/tpm/tpm.h | 5 ++++-
drivers/char/tpm/tpm_tis_core.c | 11 +++--------
3 files changed, 8 insertions(+), 10 deletions(-)
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2.13.3