Messages in this thread Patch in this message | | | From | Len Brown <> | Subject | [PATCH 05/10] x86 tsc_msr: Correct Silvermont reference clock values | Date | Fri, 17 Jun 2016 01:22:47 -0400 |
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From: Len Brown <len.brown@intel.com>
Atom processors use a 19.2 MHz crystal oscillator.
Early processors generate 100 MHz via 19.2 MHz * 26 / 5 = 99.84 MHz.
Later preocessor generate 100 MHz via 19.2 MHz * 125 / 24 = 100 MHz.
Update the Silvermont-based tables accordingly, matching the Software Developers Manual.
Also, correct a 166 MHz entry that should have been 116 MHz, and add a missing 80 MHz entry.
Reported-by: Stephane Gasparini <stephane.gasparini@intel.com> Signed-off-by: Len Brown <len.brown@intel.com> --- arch/x86/kernel/tsc_msr.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/tsc_msr.c b/arch/x86/kernel/tsc_msr.c index 4110f72..20487e2 100644 --- a/arch/x86/kernel/tsc_msr.c +++ b/arch/x86/kernel/tsc_msr.c @@ -35,11 +35,11 @@ static struct freq_desc freq_desc_tables[] = { /* CLV+ */ { 6, 0x35, 0, { 0, 133200, 0, 0, 0, 99840, 0, 83200 } }, /* TNG - Intel Atom processor Z3400 series */ - { 6, 0x4a, 1, { 0, 99840, 133200, 0, 0, 0, 0, 0 } }, + { 6, 0x4a, 1, { 0, 100000, 133300, 0, 0, 0, 0, 0 } }, /* VLV2 - Intel Atom processor E3000, Z3600, Z3700 series */ - { 6, 0x37, 1, { 83200, 99840, 133200, 166400, 0, 0, 0, 0 } }, + { 6, 0x37, 1, { 83300, 100000, 133300, 116700, 80000, 0, 0, 0 } }, /* ANN - Intel Atom processor Z3500 series */ - { 6, 0x5a, 1, { 83200, 99840, 133200, 99840, 0, 0, 0, 0 } }, + { 6, 0x5a, 1, { 83300, 100000, 133300, 100000, 0, 0, 0, 0 } }, }; static int match_cpu(u8 family, u8 model) -- 2.9.0
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