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/* Copyright 2022 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* Physical fans. These are logically separate from pwm_channels. */
#include "common.h"
#include "compile_time_macros.h"
#include "console.h"
#include "fan_chip.h"
#include "fan.h"
#include "hooks.h"
#include "pwm.h"
#include "tablet_mode.h"
#include "timer.h"
#include "thermal.h"
#include "util.h"
#define RECORD_TIME (2 * MINUTE)
/* MFT channels. These are logically separate from pwm_channels. */
const struct mft_t mft_channels[] = {
[MFT_CH_0] = {
.module = NPCX_MFT_MODULE_1,
.clk_src = TCKC_LFCLK,
.pwm_id = PWM_CH_FAN,
},
};
BUILD_ASSERT(ARRAY_SIZE(mft_channels) == MFT_CH_COUNT);
static const struct fan_conf fan_conf_0 = {
.flags = FAN_USE_RPM_MODE,
.ch = MFT_CH_0, /* Use MFT id to control fan */
.pgood_gpio = -1,
.enable_gpio = GPIO_EN_PP5000_FAN,
};
static const struct fan_rpm rpm_table[FAN_RPM_TABLE_COUNT] = {
[RPM_TABLE_CPU] = {
.rpm_min = 0,
.rpm_start = 0,
.rpm_max = 4000,
},
[RPM_TABLE_CPU_TABLET] = {
.rpm_min = 0,
.rpm_start = 0,
.rpm_max = 4000,
},
[RPM_TABLE_DDR] = {
.rpm_min = 4000,
.rpm_start = 4000,
.rpm_max = 4200,
},
[RPM_TABLE_CHARGER] = {
.rpm_min = 4000,
.rpm_start = 4000,
.rpm_max = 4200,
},
[RPM_TABLE_AMBIENT] = {
.rpm_min = 4000,
.rpm_start = 4000,
.rpm_max = 4200,
},
};
struct fan_t fans[FAN_CH_COUNT] = {
[FAN_CH_0] = {
.conf = &fan_conf_0,
.rpm = &rpm_table[RPM_TABLE_CPU],
},
};
static const struct thermal_policy_config
thermal_cfg[THERMAL_CFG_TABLE_COUNT] = {
[LAPTOP_MODE] = {
.fan_off_slop1 = 24,
.fan_max_slop1 = 51,
.fan_off_slop2 = 29,
.fan_max_slop2 = 48,
.fan_slop_threshold = 45,
.ddr_fan_turn_off = 38,
.ddr_fan_turn_on = 44,
.rpm_table_cpu = RPM_TABLE_CPU,
},
[TABLET_MODE] = {
.fan_off_slop1 = 25,
.fan_max_slop1 = 52,
.fan_off_slop2 = 30,
.fan_max_slop2 = 49,
.fan_slop_threshold = 45,
.ddr_fan_turn_off = 38,
.ddr_fan_turn_on = 44,
.rpm_table_cpu = RPM_TABLE_CPU_TABLET,
},
};
static void fan_get_rpm(int fan)
{
static timestamp_t deadline;
/* Record actual RPM every 2 minutes. */
if (timestamp_expired(deadline, NULL)) {
ccprints("fan actual rpm: %d", fan_get_rpm_actual(FAN_CH(fan)));
deadline.val += RECORD_TIME;
}
}
static void fan_set_percent(int fan, int pct)
{
int new_rpm;
new_rpm = fan_percent_to_rpm(fan, pct);
fan_set_rpm_target(FAN_CH(fan), new_rpm);
fan_get_rpm(fan);
}
void board_override_fan_control(int fan, int *tmp)
{
/*
* Crota's fan speed is control by four sensors.
*
* Sensor charger control the speed when system's temperature
* is too high.
* Other sensors control normal loading's speed.
*
* When sensor charger is triggered, the fan speed is only
* control by sensor charger, avoid heat damage to system.
* When other sensors is triggered, the fan is control
* by other sensors.
*
* Sensor SOC has two slopes for fan speed.
* Sensor DDR also become a fan on/off switch.
*/
const struct thermal_policy_config *t;
static int pct;
int i;
int fan_pct[TEMP_SENSOR_COUNT];
int fan_off;
int fan_max;
/* Decide is tablet mode or laptop mode. */
if (tablet_get_mode())
t = &thermal_cfg[TABLET_MODE];
else
t = &thermal_cfg[LAPTOP_MODE];
/* Decide sensor SOC temperature using which slope. */
if (tmp[TEMP_SENSOR_1_SOC] <= t->fan_slop_threshold) {
fan_off = t->fan_off_slop1;
fan_max = t->fan_max_slop1;
} else {
fan_off = t->fan_off_slop2;
fan_max = t->fan_max_slop2;
}
thermal_params[TEMP_SENSOR_1_SOC].temp_fan_off = C_TO_K(fan_off);
thermal_params[TEMP_SENSOR_1_SOC].temp_fan_max = C_TO_K(fan_max);
for (i = 0; i < TEMP_SENSOR_COUNT; i++) {
fan_pct[i] = thermal_fan_percent(thermal_params[i].temp_fan_off,
thermal_params[i].temp_fan_max,
C_TO_K(tmp[i]));
}
/*
* In Balance mode:
* Sensor DDR turn on when temperature > 44,
* turn off when temperature < 38
*
* In Tablet mode:
* Sensor DDR turn on when temperature > 44,
* turn off when temperature < 38
*
* When temperature from high dropping to 38 ~ 44,
* if pct is not 0, keep sensor trigger and choose table.
*/
if (((tmp[TEMP_SENSOR_2_DDR]) <= t->ddr_fan_turn_on && pct == 0) ||
((tmp[TEMP_SENSOR_2_DDR]) < t->ddr_fan_turn_off))
pct = 0;
else {
/*
* Decide which sensor was triggered and choose table.
* Priority: charger > soc > ddr > ambient
*/
if (fan_pct[TEMP_SENSOR_3_CHARGER]) {
fans[fan].rpm = &rpm_table[RPM_TABLE_CHARGER];
pct = fan_pct[TEMP_SENSOR_3_CHARGER];
} else if (fan_pct[TEMP_SENSOR_1_SOC]) {
fans[fan].rpm = &rpm_table[t->rpm_table_cpu];
pct = fan_pct[TEMP_SENSOR_1_SOC];
} else if (fan_pct[TEMP_SENSOR_2_DDR]) {
fans[fan].rpm = &rpm_table[RPM_TABLE_DDR];
pct = fan_pct[TEMP_SENSOR_2_DDR];
} else {
fans[fan].rpm = &rpm_table[RPM_TABLE_AMBIENT];
pct = fan_pct[TEMP_SENSOR_4_AMBIENT];
}
}
/* Transfer percent to rpm. */
fan_set_percent(fan, pct);
}
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