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/* Copyright 2020 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "chipset.h"
#include "common.h"
#include "console.h"
#include "fan.h"
#include "hooks.h"
#include "host_command.h"
#include "temp_sensor.h"
#include "thermal.h"
#include "util.h"
/* Console output macros */
#define CPUTS(outstr) cputs(CC_THERMAL, outstr)
#define CPRINTS(format, args...) cprints(CC_THERMAL, format, ## args)
/******************************************************************************/
/* EC thermal management configuration */
/*
* Tiger Lake specifies 100 C as maximum TDP temperature. THRMTRIP# occurs at
* 130 C. However, sensor is located next to DDR, so we need to use the lower
* DDR temperature limit (85 C).
* TODO(b/170143672): Have different sensor placement. The temperature need to
* be changed.
*/
const static struct ec_thermal_config thermal_cpu = {
.temp_host = {
[EC_TEMP_THRESH_HIGH] = C_TO_K(70),
[EC_TEMP_THRESH_HALT] = C_TO_K(80),
},
.temp_host_release = {
[EC_TEMP_THRESH_HIGH] = C_TO_K(65),
},
.temp_fan_off = C_TO_K(35),
.temp_fan_max = C_TO_K(50),
};
/*
* Inductor limits - used for both charger and PP3300 regulator
*
* Need to use the lower of the charger IC, PP3300 regulator, and the inductors
*
* Charger max recommended temperature 100C, max absolute temperature 125C
* PP3300 regulator: operating range -40 C to 145 C
*
* Inductors: limit of 125c
* PCB: limit is 80c
*/
const static struct ec_thermal_config thermal_inductor = {
.temp_host = {
[EC_TEMP_THRESH_HIGH] = C_TO_K(75),
[EC_TEMP_THRESH_HALT] = C_TO_K(80),
},
.temp_host_release = {
[EC_TEMP_THRESH_HIGH] = C_TO_K(65),
},
.temp_fan_off = C_TO_K(40),
.temp_fan_max = C_TO_K(55),
};
struct ec_thermal_config thermal_params[] = {
[TEMP_SENSOR_1_CHARGER] = thermal_inductor,
[TEMP_SENSOR_2_PP3300_REGULATOR] = thermal_inductor,
[TEMP_SENSOR_3_DDR_SOC] = thermal_cpu,
[TEMP_SENSOR_4_FAN] = thermal_cpu,
};
BUILD_ASSERT(ARRAY_SIZE(thermal_params) == TEMP_SENSOR_COUNT);
/******************************************************************************/
struct fan_step {
/*
* Sensor 1~4 trigger point, set -1 if we're not using this
* sensor to determine fan speed.
*/
int8_t on[TEMP_SENSOR_COUNT];
/*
* Sensor 1~4 trigger point, set -1 if we're not using this
* sensor to determine fan speed.
*/
int8_t off[TEMP_SENSOR_COUNT];
/* Fan rpm */
uint16_t rpm[FAN_CH_COUNT];
};
/*
* TODO(b/167931578) Only monitor sensor3 for now.
* Will add more sensors support if needed.
*/
static const struct fan_step fan_table[] = {
{
/* level 0 */
.on = {-1, -1, 44, -1},
.off = {-1, -1, 0, -1},
.rpm = {0},
},
{
/* level 1 */
.on = {-1, -1, 46, -1},
.off = {-1, -1, 44, -1},
.rpm = {3200},
},
{
/* level 2 */
.on = {-1, -1, 50, -1},
.off = {-1, -1, 45, -1},
.rpm = {3600},
},
{
/* level 3 */
.on = {-1, -1, 54, -1},
.off = {-1, -1, 49, -1},
.rpm = {4100},
},
{
/* level 4 */
.on = {-1, -1, 58, -1},
.off = {-1, -1, 53, -1},
.rpm = {4900},
},
{
/* level 5 */
.on = {-1, -1, 60, -1},
.off = {-1, -1, 57, -1},
.rpm = {5200},
},
};
int fan_table_to_rpm(int fan, int *temp)
{
/* current fan level */
static int current_level;
/* previous fan level */
static int prev_current_level;
/* previous sensor temperature */
static int prev_temp[TEMP_SENSOR_COUNT];
const int num_fan_levels = ARRAY_SIZE(fan_table);
int i;
int new_rpm = 0;
/*
* Compare the current and previous temperature, we have
* the three paths :
* 1. decreasing path. (check the release point)
* 2. increasing path. (check the trigger point)
* 3. invariant path. (return the current RPM)
*/
if (temp[TEMP_SENSOR_3_DDR_SOC] < prev_temp[TEMP_SENSOR_3_DDR_SOC]) {
for (i = current_level; i > 0; i--) {
if (temp[TEMP_SENSOR_3_DDR_SOC] <
fan_table[i].off[TEMP_SENSOR_3_DDR_SOC])
current_level = i - 1;
else
break;
}
} else if (temp[TEMP_SENSOR_3_DDR_SOC] >
prev_temp[TEMP_SENSOR_3_DDR_SOC]) {
for (i = current_level; i < num_fan_levels; i++) {
if (temp[TEMP_SENSOR_3_DDR_SOC] >
fan_table[i].on[TEMP_SENSOR_3_DDR_SOC])
current_level = i;
else
break;
}
}
if (current_level < 0)
current_level = 0;
if (current_level != prev_current_level) {
CPRINTS("temp: %d, prev_temp: %d", temp[TEMP_SENSOR_3_DDR_SOC],
prev_temp[TEMP_SENSOR_3_DDR_SOC]);
CPRINTS("current_level: %d", current_level);
}
for (i = 0; i < TEMP_SENSOR_COUNT; ++i)
prev_temp[i] = temp[i];
prev_current_level = current_level;
switch (fan) {
case FAN_CH_0:
new_rpm = fan_table[current_level].rpm[FAN_CH_0];
break;
default:
break;
}
return new_rpm;
}
void board_override_fan_control(int fan, int *temp)
{
if (chipset_in_state(CHIPSET_STATE_ON)) {
fan_set_rpm_mode(FAN_CH(fan), 1);
fan_set_rpm_target(FAN_CH(fan),
fan_table_to_rpm(fan, temp));
} else if (chipset_in_state(CHIPSET_STATE_ANY_SUSPEND)) {
/* Stop fan when enter S0ix */
fan_set_rpm_mode(FAN_CH(fan), 1);
fan_set_rpm_target(FAN_CH(fan), 0);
}
}
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