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7187bf7f62
On a Chromebook I'm working on I noticed a big (~1 second) delay during bootup where nothing was happening. Right around this big delay there were messages about the TPM: [ 2.311352] tpm_tis_spi spi0.0: TPM ready IRQ confirmed on attempt 2 [ 3.332790] tpm_tis_spi spi0.0: Cr50 firmware version: ... I put a few printouts in and saw that tpm_tis_spi_init() (specifically tpm_chip_register() in that function) was taking the lion's share of this time, though ~115 ms of the time was in cr50_print_fw_version(). Let's make a one-line change to prefer async probe for tpm_tis_spi. There's no reason we need to block other drivers from probing while we load. NOTES: * It's possible that other hardware runs through the init sequence faster than Cr50 and this isn't such a big problem for them. However, even if they are faster they are still doing _some_ transfers over a SPI bus so this should benefit everyone even if to a lesser extent. * It's possible that there are extra delays in the code that could be optimized out. I didn't dig since once I enabled async probe they no longer impacted me. Signed-off-by: Douglas Anderson <dianders@chromium.org> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> |
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| .. | ||
| eventlog | ||
| st33zp24 | ||
| Kconfig | ||
| Makefile | ||
| tpm-chip.c | ||
| tpm-dev-common.c | ||
| tpm-dev.c | ||
| tpm-dev.h | ||
| tpm-interface.c | ||
| tpm-sysfs.c | ||
| tpm.h | ||
| tpm1-cmd.c | ||
| tpm2-cmd.c | ||
| tpm2-space.c | ||
| tpm_atmel.c | ||
| tpm_atmel.h | ||
| tpm_crb.c | ||
| tpm_ftpm_tee.c | ||
| tpm_ftpm_tee.h | ||
| tpm_i2c_atmel.c | ||
| tpm_i2c_infineon.c | ||
| tpm_i2c_nuvoton.c | ||
| tpm_ibmvtpm.c | ||
| tpm_ibmvtpm.h | ||
| tpm_infineon.c | ||
| tpm_nsc.c | ||
| tpm_ppi.c | ||
| tpm_tis.c | ||
| tpm_tis_core.c | ||
| tpm_tis_core.h | ||
| tpm_tis_spi.h | ||
| tpm_tis_spi_cr50.c | ||
| tpm_tis_spi_main.c | ||
| tpm_vtpm_proxy.c | ||
| tpmrm-dev.c | ||
| xen-tpmfront.c | ||