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e5e9b7bd86
Change the return type of the speedstep_get_freqs() function from unsigned int to int because it may return negative error codes. For the same reason, change the 'ret' variables to int type as well. No effect on runtime. Signed-off-by: Qianfeng Rong <rongqianfeng@vivo.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Link: https://patch.msgid.link/20250902114545.651661-4-rongqianfeng@vivo.com Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
49 lines
1.7 KiB
C
49 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
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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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enum speedstep_processor {
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SPEEDSTEP_CPU_PIII_C_EARLY = 0x00000001, /* Coppermine core */
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SPEEDSTEP_CPU_PIII_C = 0x00000002, /* Coppermine core */
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SPEEDSTEP_CPU_PIII_T = 0x00000003, /* Tualatin core */
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SPEEDSTEP_CPU_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_frequency() call. */
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SPEEDSTEP_CPU_PM = 0xFFFFFF03, /* Pentium M */
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SPEEDSTEP_CPU_P4D = 0xFFFFFF04, /* desktop P4 */
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SPEEDSTEP_CPU_PCORE = 0xFFFFFF05, /* Core */
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};
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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 enum speedstep_processor 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_frequency(enum speedstep_processor 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 int speedstep_get_freqs(enum speedstep_processor 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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