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[4/7] tools/power turbostat: decode BXT TSC frequency via CPUID

Message ID 5f95473a060f563a684519f5d17ec6c86f5b9886.1459977091.git.len.brown@intel.com (mailing list archive)
State Accepted, archived
Delegated to: Rafael Wysocki
Headers show

Commit Message

Len Brown April 6, 2016, 9:15 p.m. UTC 
From: Len Brown <len.brown@intel.com>

Hard-code BXT ART to 19200MHz, so turbostat --debug
can fully enumerate TSC:

CPUID(0x15): eax_crystal: 3 ebx_tsc: 186 ecx_crystal_hz: 0
TSC: 1190 MHz (19200000 Hz * 186 / 3 / 1000000)

Signed-off-by: Len Brown <len.brown@intel.com>
---
 tools/power/x86/turbostat/turbostat.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
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Patch

diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index 1561ac5..751bbcb 100644
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -3278,7 +3278,10 @@  void process_cpuid()
 				switch(model) {
 				case 0x4E:	/* SKL */
 				case 0x5E:	/* SKL */
-					crystal_hz = 24000000;	/* 24 MHz */
+					crystal_hz = 24000000;	/* 24.0 MHz */
+					break;
+				case 0x5C:	/* BXT */
+					crystal_hz = 19200000;	/* 19.2 MHz */
 					break;
 				default:
 					crystal_hz = 0;