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msm: thermal: Simplify kernel thermal safeguard mechanism

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Using CPUFreq policy objects and setting the max frequency limit by
overriding the policy->max node, leads to race/overwrite conditions with
an user trying to use the scaling_max_frequency node.

The thermal limits are directly communicated to the 'msm' cpufreq driver
and use the cpufreq_update_policy() to ensure that the frequency is
limited as per the thermal safeguard requirements.

CRs-fixed: 370343
Change-Id: Iab5a15e0f0d25da4b9f6a9417dbfc01bf5d6f8f6
Signed-off-by: Praveen Chidambaram <pchidamb@codeaurora.org>
This commit is contained in:
Praveen Chidambaram
2012-05-25 17:36:07 -06:00
committed by Stephen Boyd
parent 042d742d21
commit af014a3fc0
3 changed files with 80 additions and 72 deletions
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34
include/linux/msm_thermal.h Normal file
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/*
* Copyright (c) 2012, Code Aurora Forum. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef __MSM_THERMAL_H
#define __MSM_THERMAL_H
struct msm_thermal_data {
uint32_t sensor_id;
uint32_t poll_ms;
uint32_t limit_temp;
uint32_t temp_hysteresis;
uint32_t limit_freq;
};
#ifdef CONFIG_THERMAL_MONITOR
extern int msm_thermal_init(struct msm_thermal_data *pdata);
#else
static inline int msm_thermal_init(struct msm_thermal_data *pdata)
{
return -ENOSYS;
}
#endif
#endif /*__MSM_THERMAL_H*/