diff options
| author | Mattia Dongili <malattia@linux.it> | 2005-12-02 21:59:41 +0100 |
|---|---|---|
| committer | Dave Jones <davej@redhat.com> | 2005-12-06 19:27:15 -0800 |
| commit | 1a10760c91c394dfe4adfefeeaf85cd8098c4894 (patch) | |
| tree | 80e6bfa8c8c247843bfbc90b9809ffafda1841f8 /arch/i386/kernel/cpu/cpufreq/speedstep-lib.h | |
| parent | fc457fa7c0cdbfe96812ba377e508880d600298f (diff) | |
[CPUFREQ] Measure transition latency at driver initialization
The attached patch introduces runtime latency measurement for ICH[234]
based chipsets instead of using CPUFREQ_ETERNAL. It includes
some sanity checks in case the measured value is out of range and
assigns a safe value of 500uSec that should still be enough on
problematics chipsets (current testing report values ~200uSec). The
measurement is currently done in speedstep_get_freqs in order to avoid
further unnecessary transitions and in the hope it'll come handy for SMI
also.
Signed-off-by: Mattia Dongili <malattia@linux.it>
Acked-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Dave Jones <davej@redhat.com>
speedstep-ich.c | 4 ++--
speedstep-lib.c | 32 +++++++++++++++++++++++++++++++-
speedstep-lib.h | 1 +
speedstep-smi.c | 1 +
4 files changed, 35 insertions(+), 3 deletions(-)
Diffstat (limited to 'arch/i386/kernel/cpu/cpufreq/speedstep-lib.h')
| -rw-r--r-- | arch/i386/kernel/cpu/cpufreq/speedstep-lib.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/i386/kernel/cpu/cpufreq/speedstep-lib.h b/arch/i386/kernel/cpu/cpufreq/speedstep-lib.h index 261a2c9b7f6..6a727fd3a77 100644 --- a/arch/i386/kernel/cpu/cpufreq/speedstep-lib.h +++ b/arch/i386/kernel/cpu/cpufreq/speedstep-lib.h @@ -44,4 +44,5 @@ extern unsigned int speedstep_get_processor_frequency(unsigned int processor); extern unsigned int speedstep_get_freqs(unsigned int processor, unsigned int *low_speed, unsigned int *high_speed, + unsigned int *transition_latency, void (*set_state) (unsigned int state)); |