diff options
| author | Olivier Certner <olce@FreeBSD.org> | 2026-06-24 20:14:12 +0000 |
|---|---|---|
| committer | Olivier Certner <olce@FreeBSD.org> | 2026-06-25 00:27:24 +0000 |
| commit | 66d48f02de0fbf4d8efb3d4edc69f37c54f130fd (patch) | |
| tree | 69dc2efecc272a7127f9e9e48634b72ea6702620 | |
| parent | 3377f38cfe284a8490b49611614aae3a2bea78e4 (diff) | |
hwpstate_intel(4): Comment the EPB to EPP computation
Explain why the '* 17' instead of '* 16', as suggested in revision
D55629.
Event: Halifax Hackathon 202606
Location: jrm@'s living room
Sponsored by: The FreeBSD Foundation
| -rw-r--r-- | sys/x86/cpufreq/hwpstate_intel.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sys/x86/cpufreq/hwpstate_intel.c b/sys/x86/cpufreq/hwpstate_intel.c index b18f1b674d22..6d3100217365 100644 --- a/sys/x86/cpufreq/hwpstate_intel.c +++ b/sys/x86/cpufreq/hwpstate_intel.c @@ -254,6 +254,10 @@ out: return (ret); } +/* + * Multiplying by 17 here allows to send [0;15] to the full [0;255] range (so + * 255 is reported when EPB is set to 15, instead of 240). + */ #define EPB_TO_EPP(x) ((x) * 17) #define EPP_TO_EPB(x) ((x) >> 4) |