Aaron Durbin (adurbin@google.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/5048
-gerrit
commit fab328c58e508f2206875016d5cf0bc9e9f8915d Author: Aaron Durbin adurbin@chromium.org Date: Tue Jan 14 17:34:10 2014 -0600
baytrail: use CPU_INTEL_TURBO_NOT_PACKAGE_SCOPED
On baytrail, it appears that the turbo disable setting is actually building-block scoped. One can see this on quad core parts where if enable_turbo() is called only on the BSP then only cpus 0 and 1 have turbo enabled. Fix this by calling enable_turbo() on all non-bsp cpus.
BUG=chrome-os-partner:25014 BRANCH=baytrail TEST=Built and booted rambi. All cpus have bit 38 set to 0 in msr 0x1a0.
Change-Id: Id493e070c4a70bb236cdbd540d2321731a99aec2 Signed-off-by: Aaron Durbin adurbin@chromium.org Reviewed-on: https://chromium-review.googlesource.com/182406 Reviewed-by: Duncan Laurie dlaurie@chromium.org --- src/soc/intel/baytrail/Kconfig | 1 + src/soc/intel/baytrail/cpu.c | 9 ++++++++- 2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/src/soc/intel/baytrail/Kconfig b/src/soc/intel/baytrail/Kconfig index a17852d..5aacbdc 100644 --- a/src/soc/intel/baytrail/Kconfig +++ b/src/soc/intel/baytrail/Kconfig @@ -14,6 +14,7 @@ config CPU_SPECIFIC_OPTIONS select CAR_MIGRATION select COLLECT_TIMESTAMPS select CPU_MICROCODE_IN_CBFS + select CPU_INTEL_TURBO_NOT_PACKAGE_SCOPED select DYNAMIC_CBMEM select HAVE_MONOTONIC_TIMER select HAVE_SMI_HANDLER diff --git a/src/soc/intel/baytrail/cpu.c b/src/soc/intel/baytrail/cpu.c index cf32c54..aff6c55 100644 --- a/src/soc/intel/baytrail/cpu.c +++ b/src/soc/intel/baytrail/cpu.c @@ -92,7 +92,7 @@ void baytrail_init_cpus(device_t dev) /* Set package MSRs */ reg_script_run(package_msr_script);
- /* Enable Turbo/Burst Mode */ + /* Enable Turbo Mode on BSP and siblings of the BSP's building block. */ enable_turbo();
if (mp_init(cpu_bus, &mp_params)) { @@ -104,6 +104,13 @@ static void baytrail_core_init(device_t cpu) { printk(BIOS_DEBUG, "Init BayTrail core.\n");
+ /* On bay trail the turbo disable bit is actually scoped at building + * block level -- not package. For non-bsp cores that are within a + * building block enable turbo. The cores within the BSP's building + * block will just see it already enabled and move on. */ + if (lapicid()) + enable_turbo(); + /* Set core MSRs */ reg_script_run(core_msr_script);