diff options
| author | Kyösti Mälkki <kyosti.malkki@gmail.com> | 2019-11-02 09:39:36 +0200 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2019-11-07 14:08:46 +0000 |
| commit | 32c8de10b03d0f7fccd4e4dc10a20f97e57cc428 (patch) | |
| tree | aa9b0f477e30c6cfb30c998721f5d5bc1d14b975 /src/cpu/intel/common/fsb.c | |
| parent | 3042af62562346b2dbcc05f8c614d3380a84d559 (diff) | |
Rangeley: Fix incorrect BCLK
Not all Rangeley SKUs have a fixed 100MHz BCLK.
As per BIOS Writer's Guide, BCLK is available in MSR_FSB_FREQ 0xCD[1:0].
Using fixed BCLK was causing wrong values of core frequencies in _PSS table
for SKUs that do not have BCLK=100MHz.
Change-Id: Id8e0244fab0283b74870950cb00a95aab2a7201f
Signed-off-by: Hannah Williams <hannah.williams@dell.com>
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35348
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/cpu/intel/common/fsb.c')
| -rw-r--r-- | src/cpu/intel/common/fsb.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/cpu/intel/common/fsb.c b/src/cpu/intel/common/fsb.c index 14dbd60e24..0004eade89 100644 --- a/src/cpu/intel/common/fsb.c +++ b/src/cpu/intel/common/fsb.c @@ -32,6 +32,7 @@ static int get_fsb_tsc(int *fsb, int *ratio) static const short core_fsb[8] = { -1, 133, -1, 166, -1, 100, -1, -1 }; static const short core2_fsb[8] = { 266, 133, 200, 166, 333, 100, 400, -1 }; static const short f2x_fsb[8] = { 100, 133, 200, 166, 333, -1, -1, -1 }; + static const short rangeley_fsb[4] = { 83, 100, 133, 116 }; msr_t msr; get_fms(&c, cpuid_eax(1)); @@ -56,10 +57,13 @@ static int get_fsb_tsc(int *fsb, int *ratio) case 0x3a: /* IvyBridge BCLK fixed at 100MHz */ case 0x3c: /* Haswell BCLK fixed at 100MHz */ case 0x45: /* Haswell-ULT BCLK fixed at 100MHz */ - case 0x4d: /* Rangeley BCLK fixed at 100MHz */ *fsb = 100; *ratio = (rdmsr(MSR_PLATFORM_INFO).lo >> 8) & 0xff; break; + case 0x4d: /* Rangeley */ + *fsb = rangeley_fsb[rdmsr(MSR_FSB_FREQ).lo & 3]; + *ratio = (rdmsr(MSR_PLATFORM_INFO).lo >> 8) & 0xff; + break; default: return -2; } |