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1a10760c91
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(-)
48 lines
1.7 KiB
C
48 lines
1.7 KiB
C
/*
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* (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
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*
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* Licensed under the terms of the GNU GPL License version 2.
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*
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* Library for common functions for Intel SpeedStep v.1 and v.2 support
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*
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* BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
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*/
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/* processors */
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#define SPEEDSTEP_PROCESSOR_PIII_C_EARLY 0x00000001 /* Coppermine core */
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#define SPEEDSTEP_PROCESSOR_PIII_C 0x00000002 /* Coppermine core */
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#define SPEEDSTEP_PROCESSOR_PIII_T 0x00000003 /* Tualatin core */
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#define SPEEDSTEP_PROCESSOR_P4M 0x00000004 /* P4-M */
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/* the following processors are not speedstep-capable and are not auto-detected
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* in speedstep_detect_processor(). However, their speed can be detected using
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* the speedstep_get_processor_frequency() call. */
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#define SPEEDSTEP_PROCESSOR_PM 0xFFFFFF03 /* Pentium M */
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#define SPEEDSTEP_PROCESSOR_P4D 0xFFFFFF04 /* desktop P4 */
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/* speedstep states -- only two of them */
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#define SPEEDSTEP_HIGH 0x00000000
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#define SPEEDSTEP_LOW 0x00000001
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/* detect a speedstep-capable processor */
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extern unsigned int speedstep_detect_processor (void);
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/* detect the current speed (in khz) of the processor */
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extern unsigned int speedstep_get_processor_frequency(unsigned int processor);
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/* detect the low and high speeds of the processor. The callback
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* set_state"'s first argument is either SPEEDSTEP_HIGH or
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* SPEEDSTEP_LOW; the second argument is zero so that no
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* cpufreq_notify_transition calls are initiated.
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*/
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extern unsigned int speedstep_get_freqs(unsigned int processor,
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unsigned int *low_speed,
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unsigned int *high_speed,
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unsigned int *transition_latency,
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void (*set_state) (unsigned int state));
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