redrix: Update fan table version 1

This patch adds a custom fan table which is controlled by EC.

BUG=b:195673113
BRANCH=none
TEST=Thermal team verified thermal policy is expected.

Signed-off-by: Devin Lu <Devin.Lu@quantatw.com>
Change-Id: I0ebf7809437d2528ec6fce5074a320580e444fd0
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3153118
Reviewed-by: Boris Mittelberg <bmbm@google.com>
Commit-Queue: Boris Mittelberg <bmbm@google.com>

3 files changed, 217 insertions, 0 deletions

diff --git a/board/redrix/board.h b/board/redrix/board.h
index 820dfcada2..a0b571a7fc 100644
--- a/board/redrix/board.h
+++ b/board/redrix/board.h
@@ -174,6 +174,7 @@
 
 /* Fan features */
 #define CONFIG_FANS		FAN_CH_COUNT
+#define CONFIG_CUSTOM_FAN_CONTROL
 
 /* Charger defines */
 #define CONFIG_CHARGER_BQ25720
diff --git a/board/redrix/build.mk b/board/redrix/build.mk
index e3a4fe0734..0c5e8e6182 100644
--- a/board/redrix/build.mk
+++ b/board/redrix/build.mk
@@ -22,4 +22,5 @@ board-y+=keyboard.o
 board-y+=led.o
 board-y+=pwm.o
 board-y+=sensors.o
+board-y+=thermal.o
 board-y+=usbc_config.o
diff --git a/board/redrix/thermal.c b/board/redrix/thermal.c
new file mode 100644
index 0000000000..39d9a49c3a
--- /dev/null
+++ b/board/redrix/thermal.c
@@ -0,0 +1,215 @@
+/* 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 "tablet_mode.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 1~2 rpm */
+	uint16_t rpm[FAN_CH_COUNT];
+};
+
+static const struct fan_step *fan_step_table;
+
+static const struct fan_step fan_table_clamshell[] = {
+	{
+		/* level 0 */
+		.on = {44, 46, 0, -1},
+		.off = {99, 99, 99, -1},
+		.rpm = {0, 0},
+	},
+	{
+		/* level 1 */
+		.on = {45, 47, 0, -1},
+		.off = {44, 46, 99, -1},
+		.rpm = {3400, 3900},
+	},
+	{
+		/* level 2 */
+		.on = {46, 48, 0, -1},
+		.off = {45, 47, 99, -1},
+		.rpm = {3700, 4200},
+	},
+	{
+		/* level 3 */
+		.on = {47, 49, 0, -1},
+		.off = {46, 48, 99, -1},
+		.rpm = {4100, 4500},
+	},
+	{
+		/* level 4 */
+		.on = {48, 50, 50, -1},
+		.off = {47, 49, 48, -1},
+		.rpm = {4200, 4600},
+	},
+	{
+		/* level 5 */
+		.on = {49, 51, 52, -1},
+		.off = {48, 50, 50, -1},
+		.rpm = {4600, 4900},
+	},
+	{
+		/* level 6 */
+		.on = {100, 100, 100, -1},
+		.off = {49, 51, 52, -1},
+		.rpm = {4900, 5200},
+	},
+};
+
+static const struct fan_step fan_table_tablet[] = {
+	{
+		/* level 0 */
+		.on = {44, 46, 0, -1},
+		.off = {99, 99, 99, -1},
+		.rpm = {0, 0},
+	},
+	{
+		/* level 1 */
+		.on = {45, 47, 0, -1},
+		.off = {44, 46, 99, -1},
+		.rpm = {3400, 3900},
+	},
+	{
+		/* level 2 */
+		.on = {46, 48, 0, -1},
+		.off = {45, 47, 99, -1},
+		.rpm = {3700, 4200},
+	},
+	{
+		/* level 3 */
+		.on = {47, 49, 0, -1},
+		.off = {46, 48, 99, -1},
+		.rpm = {4100, 4500},
+	},
+	{
+		/* level 4 */
+		.on = {48, 50, 50, -1},
+		.off = {47, 49, 48, -1},
+		.rpm = {4200, 4600},
+	},
+	{
+		/* level 5 */
+		.on = {49, 51, 52, -1},
+		.off = {48, 50, 50, -1},
+		.rpm = {4600, 4900},
+	},
+	{
+		/* level 6 */
+		.on = {100, 100, 100, -1},
+		.off = {49, 51, 52, -1},
+		.rpm = {4900, 5200},
+	},
+};
+
+#define NUM_FAN_LEVELS ARRAY_SIZE(fan_table_clamshell)
+
+BUILD_ASSERT(ARRAY_SIZE(fan_table_clamshell) ==
+	ARRAY_SIZE(fan_table_tablet));
+
+int fan_table_to_rpm(int fan, int *temp)
+{
+	static int current_level;
+	static int prev_tmp[TEMP_SENSOR_COUNT];
+	int new_rpm = 0;
+	int i;
+
+	if (tablet_get_mode())
+		fan_step_table = fan_table_tablet;
+	else
+		fan_step_table = fan_table_clamshell;
+
+	/*
+	 * 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_1_DDR] < prev_tmp[TEMP_SENSOR_1_DDR] ||
+	    temp[TEMP_SENSOR_2_SOC] < prev_tmp[TEMP_SENSOR_2_SOC] ||
+	    temp[TEMP_SENSOR_3_CHARGER] < prev_tmp[TEMP_SENSOR_3_CHARGER]) {
+		for (i = current_level; i > 0; i--) {
+			if (temp[TEMP_SENSOR_1_DDR] <
+				fan_step_table[i].off[TEMP_SENSOR_1_DDR] &&
+			    temp[TEMP_SENSOR_3_CHARGER] <
+				fan_step_table[i].off[TEMP_SENSOR_3_CHARGER] &&
+			    temp[TEMP_SENSOR_2_SOC] <
+				fan_step_table[i].off[TEMP_SENSOR_2_SOC])
+				current_level = i - 1;
+			else
+				break;
+		}
+	} else if (temp[TEMP_SENSOR_1_DDR] > prev_tmp[TEMP_SENSOR_1_DDR] ||
+		   temp[TEMP_SENSOR_2_SOC] > prev_tmp[TEMP_SENSOR_2_SOC] ||
+		   temp[TEMP_SENSOR_3_CHARGER] >
+			prev_tmp[TEMP_SENSOR_3_CHARGER]) {
+		for (i = current_level; i < NUM_FAN_LEVELS; i++) {
+			if ((temp[TEMP_SENSOR_1_DDR] >
+				fan_step_table[i].on[TEMP_SENSOR_1_DDR] &&
+			    temp[TEMP_SENSOR_3_CHARGER] >
+				fan_step_table[i].on[TEMP_SENSOR_3_CHARGER]) ||
+			    temp[TEMP_SENSOR_2_SOC] >
+				fan_step_table[i].on[TEMP_SENSOR_2_SOC])
+				current_level = i + 1;
+			else
+				break;
+		}
+	}
+
+	if (current_level < 0)
+		current_level = 0;
+
+	for (i = 0; i < TEMP_SENSOR_COUNT; ++i)
+		prev_tmp[i] = temp[i];
+
+	ASSERT(current_level < NUM_FAN_LEVELS);
+
+	switch (fan) {
+	case FAN_CH_0:
+		new_rpm = fan_step_table[current_level].rpm[FAN_CH_0];
+		break;
+	case FAN_CH_1:
+		new_rpm = fan_step_table[current_level].rpm[FAN_CH_1];
+		break;
+	default:
+		break;
+	}
+
+	return new_rpm;
+}
+
+void board_override_fan_control(int fan, int *tmp)
+{
+	if (chipset_in_state(CHIPSET_STATE_ON |
+		CHIPSET_STATE_ANY_SUSPEND)) {
+		fan_set_rpm_mode(FAN_CH(fan), 1);
+		fan_set_rpm_target(FAN_CH(fan),
+			fan_table_to_rpm(fan, tmp));
+	}
+}