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/* Copyright 2021 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)
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 = {44, -1, -1},
.off = {0, -1, -1},
.rpm = {0},
},
{
/* level 1 */
.on = {46, -1, -1},
.off = {44, -1, -1},
.rpm = {3200},
},
{
/* level 2 */
.on = {50, -1, -1},
.off = {45, -1, -1},
.rpm = {3600},
},
{
/* level 3 */
.on = {54, -1, -1},
.off = {49, -1, -1},
.rpm = {4100},
},
{
/* level 4 */
.on = {58, -1, -1},
.off = {53, -1, -1},
.rpm = {4900},
},
{
/* level 5 */
.on = {60, -1, -1},
.off = {57, -1, -1},
.rpm = {5200},
},
};
const int num_fan_levels = ARRAY_SIZE(fan_table);
int fan_table_to_rpm(int fan, int *temp, enum temp_sensor_id temp_sensor)
{
/* 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];
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] < prev_temp[temp_sensor]) {
for (i = current_level; i > 0; i--) {
if (temp[temp_sensor] <
fan_table[i].off[temp_sensor])
current_level = i - 1;
else
break;
}
} else if (temp[temp_sensor] >
prev_temp[temp_sensor]) {
for (i = current_level; i < num_fan_levels; i++) {
if (temp[temp_sensor] >
fan_table[i].on[temp_sensor])
current_level = i + 1;
else
break;
}
}
if (current_level < 0)
current_level = 0;
if (current_level != prev_current_level) {
CPRINTS("temp: %d, prev_temp: %d", temp[temp_sensor],
prev_temp[temp_sensor]);
CPRINTS("current_level: %d", current_level);
}
prev_temp[temp_sensor] = temp[temp_sensor];
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_CH(fan), temp, TEMP_SENSOR_1_DDR_SOC));
} 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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