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cf151a9a44
linux/drivers/char/tpm
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Nayna Jain cf151a9a44 tpm: reduce tpm polling delay in tpm_tis_core 
The existing wait_for_tpm_stat() polls for the chip status after
5msec sleep. As per TCG ddwg input, it is expected that tpm might
return status in few usec. So, reducing the delay in polling to
1msec.
Similarly, get_burstcount() function sleeps for 5msec before
retrying for next query to burstcount in a loop. If it takes
lesser time for TPM to return, this 5msec delay is longer than
necessary.

After this change, performance on a TPM 1.2 with an 8 byte
burstcount for 1000 extends improved from ~14sec to ~9sec.

Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
2018-01-08 12:58:33 +02:00
..
st33zp24 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig tpm/tpm_crb: Enable TPM CRB interface for ARM64 2017-04-03 22:46:03 +03:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
tpm1_eventlog.c tpm: add securityfs support for TPM 2.0 firmware event log 2017-02-03 22:03:14 +02:00
tpm2_eventlog.c tpm: fix handling of the TPM 2.0 event logs 2017-04-25 00:27:18 +03:00
tpm2-cmd.c tpm: fix type of a local variable in tpm2_get_cc_attrs_tbl() 2017-10-18 18:28:48 +03:00
tpm2-space.c tpm: fix type of a local variable in tpm2_map_command() 2017-10-18 18:28:48 +03:00
tpm_acpi.c tpm: add securityfs support for TPM 2.0 firmware event log 2017-02-03 22:03:14 +02:00
tpm_atmel.c tpm/tpm_atmel: remove unnecessary NULL check 2017-06-19 02:36:04 +02:00
tpm_atmel.h tpm: remove tpm_read_index and tpm_write_index from tpm.h 2017-02-03 22:03:14 +02:00
tpm_crb.c tpm/tpm_crb: Use start method value from ACPI table directly 2017-10-18 18:28:45 +03:00
tpm_eventlog.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
tpm_i2c_atmel.c tpm: Factor out common startup code 2016-07-19 17:43:38 +03:00
tpm_i2c_infineon.c tpm: Apply a sane minimum adapterlimit value for retransmission. 2017-06-13 22:02:08 +03:00
tpm_i2c_nuvoton.c tpm: add sleep only for retry in i2c_nuvoton_write_status() 2017-04-03 22:46:02 +03:00
tpm_ibmvtpm.c tpm: ibmvtpm: simplify crq initialization and document crq format 2017-09-23 21:51:38 -07:00
tpm_ibmvtpm.h tpm_ibmvtpm: properly handle interrupted packet receptions 2015-12-20 15:27:12 +02:00
tpm_infineon.c tpm: replace msleep() with usleep_range() in TPM 1.2/2.0 generic drivers 2017-09-23 21:51:00 -07:00
tpm_nsc.c tpm: remove tpm_read_index and tpm_write_index from tpm.h 2017-02-03 22:03:14 +02:00
tpm_of.c tpm: do not suspend/resume if power stays on 2017-07-07 09:49:26 +10:00
tpm_ppi.c ACPI: Switch to use generic guid_t in acpi_evaluate_dsm() 2017-06-07 12:20:49 +02:00
tpm_tis_core.c tpm: reduce tpm polling delay in tpm_tis_core 2018-01-08 12:58:33 +02:00
tpm_tis_core.h tpm: constify transmit data pointers 2017-10-18 18:28:45 +03:00
tpm_tis_spi.c tpm: fix type of a local variables in tpm_tis_spi.c 2017-10-18 18:28:48 +03:00
tpm_tis.c tpm, tpm_tis: use ARRAY_SIZE() to define TPM_HID_USR_IDX 2017-10-18 18:28:49 +03:00
tpm_vtpm_proxy.c tpm: vtpm_proxy: Prevent userspace from sending driver command 2017-06-13 22:02:09 +03:00
tpm-chip.c Do not disable driver and bus shutdown hook when class shutdown hook is set. 2017-08-28 18:02:46 +02:00
tpm-dev-common.c treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
tpm-dev.c tpm: split out tpm-dev.c into tpm-dev.c and tpm-common-dev.c 2017-04-03 22:46:01 +03:00
tpm-dev.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
tpm-interface.c tpm: move wait_for_tpm_stat() to respective driver files 2017-12-16 20:27:32 +02:00
tpm-sysfs.c tpm: migrate pubek_show to struct tpm_buf 2017-10-12 14:28:59 +03:00
tpm.h tpm: move wait_for_tpm_stat() to respective driver files 2017-12-16 20:27:32 +02:00
tpmrm-dev.c tpm, tpmrm: Mark tpmrm_write as static 2017-06-13 22:02:08 +03:00
xen-tpmfront.c tpm: move wait_for_tpm_stat() to respective driver files 2017-12-16 20:27:32 +02:00