Change in coreboot[master]: cpu/x86/tsc: Replace TSC_CONSTANT_RATE with UNKNOWN_TSC_RATE

[Kyösti Mälkki (Code Review)]

Hello Aaron Durbin, Patrick Rudolph, Arthur Heymans, build bot (Jenkins), Patrick Georgi, HAOUAS Elyes, Vanny E, Huang Jin, Philipp Deppenwiese, Nico Huber, David Guckian, Martin Roth,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/33928

to look at the new patch set (#14).

Change subject: cpu/x86/tsc: Replace TSC_CONSTANT_RATE with UNKNOWN_TSC_RATE
......................................................................

cpu/x86/tsc: Replace TSC_CONSTANT_RATE with UNKNOWN_TSC_RATE

Implementations with LAPIC_MONOTONIC_TIMER typically will
not have tsc_freq_mhz() implemented and default to UNKNOWN_TSC_RATE.

Implementations of tsc_freq_mhz() already cache the value
in .bss.

Note that for boards with UNKNOWN_TSC_RATE=y, each stage will have
a slow run of calibrate_tsc_with_pit(). This is easy enough
to fix with followup implementation of tsc_freq_mhz() for
the cpu.

For mb/via/epia-m850 romstage additionally changes from UDELAY_IO
to UDELAY_TSC.

Change-Id: I1690cb80295d6b006b75ed69edea28899b674b68
Signed-off-by: Kyösti Mälkki 
---
M src/arch/x86/cpu.c
M src/arch/x86/timestamp.c
M src/cpu/intel/fsp_model_406dx/Kconfig
M src/cpu/intel/haswell/Kconfig
M src/cpu/intel/model_1067x/Kconfig
M src/cpu/intel/model_106cx/Kconfig
M src/cpu/intel/model_2065x/Kconfig
M src/cpu/intel/model_206ax/Kconfig
M src/cpu/intel/model_6ex/Kconfig
M src/cpu/intel/model_6fx/Kconfig
M src/cpu/intel/slot_1/Kconfig
M src/cpu/intel/socket_mPGA604/Kconfig
M src/cpu/qemu-x86/Kconfig
M src/cpu/via/nano/Kconfig
M src/cpu/x86/Kconfig
M src/cpu/x86/tsc/Makefile.inc
M src/cpu/x86/tsc/delay_tsc.c
M src/drivers/pc80/pc/i8254.c
M src/include/cpu/x86/tsc.h
M src/northbridge/via/vx900/Makefile.inc
M src/soc/amd/picasso/Kconfig
M src/soc/intel/apollolake/Kconfig
M src/soc/intel/baytrail/Kconfig
M src/soc/intel/braswell/Kconfig
M src/soc/intel/broadwell/Kconfig
M src/soc/intel/cannonlake/Kconfig
M src/soc/intel/denverton_ns/Kconfig
M src/soc/intel/fsp_baytrail/Kconfig
M src/soc/intel/fsp_broadwell_de/Kconfig
M src/soc/intel/icelake/Kconfig
M src/soc/intel/quark/Kconfig
M src/soc/intel/skylake/Kconfig
32 files changed, 43 insertions(+), 54 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/28/33928/14