diff options
| author | Duncan Laurie <dlaurie@chromium.org> | 2014-03-28 10:52:13 -0700 |
|---|---|---|
| committer | Marc Jones <marc.jones@se-eng.com> | 2014-10-28 17:57:12 +0100 |
| commit | 31ac9e3a9a53523ad342af55b9a20c3c51cd927a (patch) | |
| tree | 2166177d25481b6ccf2e47e6617b16f2553f1e6b /src/soc/intel/baytrail/acpi.c | |
| parent | 89f5292ee63cb6f387c06bfbdb4343cc675bc938 (diff) | |
baytrail: Configure MSR for 2-core and 4-core P-state configutation
Suggested settings to try for performace regression:
2-core systems:
- MSR_PMG_CST_CONFIG_CONTROL clear bit 11 (SINGLE_PCTL)
- MSR_POWER_MISC clear bit 2,3
- \_PR.CPUx._PSD coordination set to 0xFE (HW_ALL)
4-core systems:
- MSR_PMG_CST_CONFIG_CONTROL clear bit 11 (SINGLE_PCTL)
- MSR_POWER_MISC clear bit 2,3
- \_PR.CPUx._PSD coordination set to 0xFC (SW_ALL)
BUG=chrome-os-partner:26211
BRANCH=baytrail
TEST=emerge-rambi chromeos-coreboot-rambi
Change-Id: Ib68a86525204ae47a820c269257a7b8df9300a6a
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/192573
Tested-by: Shawn Nematbakhsh <shawnn@chromium.org>
Commit-Queue: Shawn Nematbakhsh <shawnn@chromium.org>
(cherry picked from commit 8c8c0be0000043610eaa56926eff978f352819b8)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>
Reviewed-on: http://review.coreboot.org/7213
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Diffstat (limited to 'src/soc/intel/baytrail/acpi.c')
| -rw-r--r-- | src/soc/intel/baytrail/acpi.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/src/soc/intel/baytrail/acpi.c b/src/soc/intel/baytrail/acpi.c index 67e8c0ca89..aae0c9961a 100644 --- a/src/soc/intel/baytrail/acpi.c +++ b/src/soc/intel/baytrail/acpi.c @@ -354,8 +354,7 @@ static int generate_P_state_entries(int core, int cores_per_package) vid_min = pattrs->iacore_vids[IACORE_LFM]; /* Set P-states coordination type based on MSR disable bit */ - msr = rdmsr(MSR_PMG_CST_CONFIG_CONTROL); - coord_type = (msr.lo & SINGLE_PCTL) ? SW_ALL : HW_ALL; + coord_type = (pattrs->num_cpus > 2) ? SW_ALL : HW_ALL; /* Max Non-Turbo Frequency */ clock_max = (ratio_max * pattrs->bclk_khz) / 1000; |