thermal: mediatek: add support for MT7986 and MT7981

Add support for V3 generation thermal found in MT7986 and MT7981 SoCs.
Brings code to assign values from efuse as well as new function to convert raw temperature to millidegree celsius, as found in MediaTek's
SDK sources (but cleaned up and de-duplicated)

[1]:
https://git01.mediatek.com/plugins/gitiles/openwrt/feeds/mtk-openwrt-feeds/+/baf36c7eef477aae1f8f2653b6c29e2caf48475b

Signed-off-by Daniel Golle <[email protected]>

---
Changes since v1: Drop use of adc_oe field in efuse, Henry Yen confirmed
its use has been dropped intentionally in MTK SDK as well.

 drivers/thermal/mtk_thermal.c | 122

+++++++++++++++++++++++++++++++++-

Add support for V3 generation thermal found in MT7986 and MT7981 SoCs. Brings code to assign values from efuse as well as new function to convert raw temperature to millidegree celsius, as found in MediaTek's SDK sources (but cleaned up and de-duplicated)

[1]: https://git01.mediatek.com/plugins/gitiles/openwrt/feeds/mtk-openwrt-feeds/+/baf36c7eef477aae1f8f2653b6c29e2caf48475b

Signed-off-by Daniel Golle <[email protected]>

Reviewed-by Henry Yen <[email protected]>

---
Changes since v1: Drop use of adc_oe field in efuse, Henry Yen confirmed its use has been dropped intentionally in MTK SDK as well.

  drivers/thermal/mtk_thermal.c | 122 +++++++++++++++++++++++++++++++++-
  1 file changed, 119 insertions(+), 3 deletions(-)

drivers/thermal/mtk_thermal.c +85 -0

index 8440692e3890..6a69419f8960 100644
@@ -150,6 +150,21 @@
  #define CALIB_BUF1_VALID_V2(x)		(((x) >> 4) & 0x1)
  #define CALIB_BUF1_O_SLOPE_SIGN_V2(x)	(((x) >> 3) & 0x1)
 
+/*
+ * Layout of the fuses providing the calibration data
+ * These macros can be used for MT7981 and MT7986.
+ */
+#define CALIB_BUF0_ADC_GE_V3(x)		(((x) >> 0) & 0x3ff)
+#define CALIB_BUF0_ADC_OE_V3(x)		(((x) >> 10) & 0x3ff)
+#define CALIB_BUF0_DEGC_CALI_V3(x)	(((x) >> 20) & 0x3f)
+#define CALIB_BUF0_O_SLOPE_V3(x)	(((x) >> 26) & 0x3f)
+#define CALIB_BUF1_VTS_TS1_V3(x)	(((x) >> 0) & 0x1ff)
+#define CALIB_BUF1_VTS_TS2_V3(x)	(((x) >> 21) & 0x1ff)
+#define CALIB_BUF1_VTS_TSABB_V3(x)	(((x) >> 9) & 0x1ff)
+#define CALIB_BUF1_VALID_V3(x)		(((x) >> 18) & 0x1)
+#define CALIB_BUF1_O_SLOPE_SIGN_V3(x)	(((x) >> 19) & 0x1)
+#define CALIB_BUF1_ID_V3(x)		(((x) >> 20) & 0x1)
+
  enum {
  	VTS1,
  	VTS2,

@@ -163,6 +178,7 @@ enum {
  enum mtk_thermal_version {
  	MTK_THERMAL_V1 = 1,
  	MTK_THERMAL_V2,
+	MTK_THERMAL_V3,
  };
 
  /* MT2701 thermal sensors */

@@ -245,6 +261,27 @@ enum mtk_thermal_version {
  /* The calibration coefficient of sensor  */
  #define MT8183_CALIBRATION	153
 
+/* AUXADC channel 11 is used for the temperature sensors */
+#define MT7986_TEMP_AUXADC_CHANNEL	11
+
+/* The total number of temperature sensors in the MT7986 */
+#define MT7986_NUM_SENSORS		1
+
+/* The number of banks in the MT7986 */
+#define MT7986_NUM_ZONES		1
+
+/* The number of sensing points per bank */
+#define MT7986_NUM_SENSORS_PER_ZONE	1
+
+/* MT7986 thermal sensors */
+#define MT7986_TS1			0
+
+/* The number of controller in the MT7986 */
+#define MT7986_NUM_CONTROLLER		1
+
+/* The calibration coefficient of sensor  */
+#define MT7986_CALIBRATION		165
+
  struct mtk_thermal;
 
  struct thermal_bank_cfg {

@@ -386,6 +423,14 @@ static const int mt7622_mux_values[MT7622_NUM_SENSORS] = { 0, };
  static const int mt7622_vts_index[MT7622_NUM_SENSORS] = { VTS1 };
  static const int mt7622_tc_offset[MT7622_NUM_CONTROLLER] = { 0x0, };
 
+/* MT7986 thermal sensor data */
+static const int mt7986_bank_data[MT7986_NUM_SENSORS] = { MT7986_TS1, };
+static const int mt7986_msr[MT7986_NUM_SENSORS_PER_ZONE] = { TEMP_MSR0, };
+static const int mt7986_adcpnp[MT7986_NUM_SENSORS_PER_ZONE] = { TEMP_ADCPNP0, };
+static const int mt7986_mux_values[MT7986_NUM_SENSORS] = { 0, };
+static const int mt7986_vts_index[MT7986_NUM_SENSORS] = { VTS1 };
+static const int mt7986_tc_offset[MT7986_NUM_CONTROLLER] = { 0x0, };
+
  /*
   * The MT8173 thermal controller has four banks. Each bank can read up to
   * four temperature sensors simultaneously. The MT8173 has a total of 5

@@ -549,6 +594,30 @@ static const struct mtk_thermal_data mt8183_thermal_data = {
  	.version = MTK_THERMAL_V1,
  };
 
+/*
+ * MT7986 uses AUXADC Channel 11 for raw data access.
+ */
+static const struct mtk_thermal_data mt7986_thermal_data = {
+	.auxadc_channel = MT7986_TEMP_AUXADC_CHANNEL,
+	.num_banks = MT7986_NUM_ZONES,
+	.num_sensors = MT7986_NUM_SENSORS,
+	.vts_index = mt7986_vts_index,
+	.cali_val = MT7986_CALIBRATION,
+	.num_controller = MT7986_NUM_CONTROLLER,
+	.controller_offset = mt7986_tc_offset,
+	.need_switch_bank = true,
+	.bank_data = {
+		{
+			.num_sensors = 1,
+			.sensors = mt7986_bank_data,
+		},
+	},
+	.msr = mt7986_msr,
+	.adcpnp = mt7986_adcpnp,
+	.sensor_mux_values = mt7986_mux_values,
+	.version = MTK_THERMAL_V3,
+};
+
  /**
   * raw_to_mcelsius - convert a raw ADC value to mcelsius
   * @mt:	The thermal controller

@@ -603,6 +672,22 @@ static int raw_to_mcelsius_v2(struct mtk_thermal *mt, int sensno, s32 raw)
  	return (format_2 - tmp) * 100;
  }
 
+static int raw_to_mcelsius_v3(struct mtk_thermal *mt, int sensno, s32 raw)
+{
+	s32 tmp;
+
+	if (raw == 0)
+		return 0;
+
+	raw &= 0xfff;
+	tmp = 100000 * 15 / 16 * 10000;
+	tmp /= 4096 - 512 + mt->adc_ge;
+	tmp /= 1490;
+	tmp *= raw - mt->vts[sensno] - 2900;
+
+	return mt->degc_cali * 500 - tmp;
+}
+
  /**
   * mtk_thermal_get_bank - get bank
   * @bank:	The bank

@@ -659,9 +744,12 @@ static int mtk_thermal_bank_temperature(struct mtk_thermal_bank *bank)
  		if (mt->conf->version == MTK_THERMAL_V1) {

drivers/thermal/mtk_thermal.c +21 -0

  		/*

@@ -887,6 +975,26 @@ static int mtk_thermal_extract_efuse_v2(struct mtk_thermal *mt, u32 *buf)
  	return 0;
  }
 
+static int mtk_thermal_extract_efuse_v3(struct mtk_thermal *mt, u32 *buf)
+{
+	if (!CALIB_BUF1_VALID_V3(buf[1]))
+		return -EINVAL;
+
+	mt->adc_oe = CALIB_BUF0_ADC_OE_V3(buf[0]);
+	mt->adc_ge = CALIB_BUF0_ADC_GE_V3(buf[0]);
+	mt->degc_cali = CALIB_BUF0_DEGC_CALI_V3(buf[0]);
+	mt->o_slope = CALIB_BUF0_O_SLOPE_V3(buf[0]);
+	mt->vts[VTS1] = CALIB_BUF1_VTS_TS1_V3(buf[1]);
+	mt->vts[VTS2] = CALIB_BUF1_VTS_TS2_V3(buf[1]);
+	mt->vts[VTSABB] = CALIB_BUF1_VTS_TSABB_V3(buf[1]);
+	mt->o_slope_sign = CALIB_BUF1_O_SLOPE_SIGN_V3(buf[1]);
+
+	if (CALIB_BUF1_ID_V3(buf[1]) == 0)
+		mt->o_slope = 0;
+
+	return 0;
+}
+
  static int mtk_thermal_get_calibration_data(struct device *dev,
  					    struct mtk_thermal *mt)
  {

@@ -897,6 +1005,7 @@ static int mtk_thermal_get_calibration_data(struct device *dev,
 
  	/* Start with default values */
  	mt->adc_ge = 512;
+	mt->adc_oe = 512;
  	for (i = 0; i < mt->conf->num_sensors; i++)
  		mt->vts[i] = 260;
  	mt->degc_cali = 40;

Il 30/11/22 14:19, Daniel Golle ha scritto:

Quoted 141 lines

Add support for V3 generation thermal found in MT7986 and MT7981 SoCs. Brings code to assign values from efuse as well as new function to convert raw temperature to millidegree celsius, as found in MediaTek's SDK sources (but cleaned up and de-duplicated)

[1]: https://git01.mediatek.com/plugins/gitiles/openwrt/feeds/mtk-openwrt-feeds/+/baf36c7eef477aae1f8f2653b6c29e2caf48475b

Signed-off-by Daniel Golle <[email protected]>

Reviewed-by Henry Yen <[email protected]>

---
Changes since v1: Drop use of adc_oe field in efuse, Henry Yen confirmed its use has been dropped intentionally in MTK SDK as well.

  drivers/thermal/mtk_thermal.c | 122 +++++++++++++++++++++++++++++++++-
  1 file changed, 119 insertions(+), 3 deletions(-)

drivers/thermal/mtk_thermal.c +85 -0

index 8440692e3890..6a69419f8960 100644
@@ -150,6 +150,21 @@
  #define CALIB_BUF1_VALID_V2(x)		(((x) >> 4) & 0x1)
  #define CALIB_BUF1_O_SLOPE_SIGN_V2(x)	(((x) >> 3) & 0x1)
+/*
+ * Layout of the fuses providing the calibration data
+ * These macros can be used for MT7981 and MT7986.
+ */
+#define CALIB_BUF0_ADC_GE_V3(x)		(((x) >> 0) & 0x3ff)
+#define CALIB_BUF0_ADC_OE_V3(x)		(((x) >> 10) & 0x3ff)
+#define CALIB_BUF0_DEGC_CALI_V3(x)	(((x) >> 20) & 0x3f)
+#define CALIB_BUF0_O_SLOPE_V3(x)	(((x) >> 26) & 0x3f)
+#define CALIB_BUF1_VTS_TS1_V3(x)	(((x) >> 0) & 0x1ff)
+#define CALIB_BUF1_VTS_TS2_V3(x)	(((x) >> 21) & 0x1ff)
+#define CALIB_BUF1_VTS_TSABB_V3(x)	(((x) >> 9) & 0x1ff)
+#define CALIB_BUF1_VALID_V3(x)		(((x) >> 18) & 0x1)
+#define CALIB_BUF1_O_SLOPE_SIGN_V3(x)	(((x) >> 19) & 0x1)
+#define CALIB_BUF1_ID_V3(x)		(((x) >> 20) & 0x1)
+
  enum {
  	VTS1,
  	VTS2,

@@ -163,6 +178,7 @@ enum {
  enum mtk_thermal_version {
  	MTK_THERMAL_V1 = 1,
  	MTK_THERMAL_V2,
+	MTK_THERMAL_V3,
  };
  /* MT2701 thermal sensors */

@@ -245,6 +261,27 @@ enum mtk_thermal_version {
  /* The calibration coefficient of sensor  */
  #define MT8183_CALIBRATION	153
+/* AUXADC channel 11 is used for the temperature sensors */
+#define MT7986_TEMP_AUXADC_CHANNEL	11
+
+/* The total number of temperature sensors in the MT7986 */
+#define MT7986_NUM_SENSORS		1
+
+/* The number of banks in the MT7986 */
+#define MT7986_NUM_ZONES		1
+
+/* The number of sensing points per bank */
+#define MT7986_NUM_SENSORS_PER_ZONE	1
+
+/* MT7986 thermal sensors */
+#define MT7986_TS1			0
+
+/* The number of controller in the MT7986 */
+#define MT7986_NUM_CONTROLLER		1
+
+/* The calibration coefficient of sensor  */
+#define MT7986_CALIBRATION		165
+
  struct mtk_thermal;
  struct thermal_bank_cfg {

@@ -386,6 +423,14 @@ static const int mt7622_mux_values[MT7622_NUM_SENSORS] = { 0, };
  static const int mt7622_vts_index[MT7622_NUM_SENSORS] = { VTS1 };
  static const int mt7622_tc_offset[MT7622_NUM_CONTROLLER] = { 0x0, };
+/* MT7986 thermal sensor data */
+static const int mt7986_bank_data[MT7986_NUM_SENSORS] = { MT7986_TS1, };
+static const int mt7986_msr[MT7986_NUM_SENSORS_PER_ZONE] = { TEMP_MSR0, };
+static const int mt7986_adcpnp[MT7986_NUM_SENSORS_PER_ZONE] = { TEMP_ADCPNP0, };
+static const int mt7986_mux_values[MT7986_NUM_SENSORS] = { 0, };
+static const int mt7986_vts_index[MT7986_NUM_SENSORS] = { VTS1 };
+static const int mt7986_tc_offset[MT7986_NUM_CONTROLLER] = { 0x0, };
+
  /*
   * The MT8173 thermal controller has four banks. Each bank can read up to
   * four temperature sensors simultaneously. The MT8173 has a total of 5

@@ -549,6 +594,30 @@ static const struct mtk_thermal_data mt8183_thermal_data = {
  	.version = MTK_THERMAL_V1,
  };
+/*
+ * MT7986 uses AUXADC Channel 11 for raw data access.
+ */
+static const struct mtk_thermal_data mt7986_thermal_data = {
+	.auxadc_channel = MT7986_TEMP_AUXADC_CHANNEL,
+	.num_banks = MT7986_NUM_ZONES,
+	.num_sensors = MT7986_NUM_SENSORS,
+	.vts_index = mt7986_vts_index,
+	.cali_val = MT7986_CALIBRATION,
+	.num_controller = MT7986_NUM_CONTROLLER,
+	.controller_offset = mt7986_tc_offset,
+	.need_switch_bank = true,
+	.bank_data = {
+		{
+			.num_sensors = 1,
+			.sensors = mt7986_bank_data,
+		},
+	},
+	.msr = mt7986_msr,
+	.adcpnp = mt7986_adcpnp,
+	.sensor_mux_values = mt7986_mux_values,
+	.version = MTK_THERMAL_V3,
+};
+
  /**
   * raw_to_mcelsius - convert a raw ADC value to mcelsius
   * @mt:	The thermal controller

@@ -603,6 +672,22 @@ static int raw_to_mcelsius_v2(struct mtk_thermal *mt, int sensno, s32 raw)
  	return (format_2 - tmp) * 100;
  }
+static int raw_to_mcelsius_v3(struct mtk_thermal *mt, int sensno, s32 raw)
+{
+	s32 tmp;
+
+	if (raw == 0)
+		return 0;
+
+	raw &= 0xfff;
+	tmp = 100000 * 15 / 16 * 10000;
+	tmp /= 4096 - 512 + mt->adc_ge;
+	tmp /= 1490;
+	tmp *= raw - mt->vts[sensno] - 2900;
+
+	return mt->degc_cali * 500 - tmp;
+}
+
  /**
   * mtk_thermal_get_bank - get bank
   * @bank:	The bank

@@ -659,9 +744,12 @@ static int mtk_thermal_bank_temperature(struct mtk_thermal_bank *bank)
  		if (mt->conf->version == MTK_THERMAL_V1) {

drivers/thermal/mtk_thermal.c static int mtk_thermal_bank_temperature(struct mtk_thermal_bank *bank) · line 753

Quoted 10 lines

drivers/thermal/mtk_thermal.c +4 -1

  			temp = raw_to_mcelsius_v1(
  				mt, conf->bank_data[bank->id].sensors[i], raw);
-		} else {
+		} else if (mt->conf->version == MTK_THERMAL_V2) {
  			temp = raw_to_mcelsius_v2(
  				mt, conf->bank_data[bank->id].sensors[i], raw);
+		} else {
+			temp = raw_to_mcelsius_v3(
+				mt, conf->bank_data[bank->id].sensors[i], raw);
  		}

What about optimizing this with assigning a function pointer? Like that, we wouldn't check any version in there... as in that case we'd simply do something like

temp = conf->raw_to_mcelsius(mt, conf->bank...blahblah...);

...and this would also mean that the snippet saying "the first read of a sensor often contains very high bogus temperature value [...]" would get merged in the v2 of raw_to_mcelsius (as that function is used only in mtk_thermal_bank_temperature).

Quoted 36 lines

drivers/thermal/mtk_thermal.c +21 -0

  		/*

@@ -887,6 +975,26 @@ static int mtk_thermal_extract_efuse_v2(struct mtk_thermal *mt, u32 *buf)
  	return 0;
  }
+static int mtk_thermal_extract_efuse_v3(struct mtk_thermal *mt, u32 *buf)
+{
+	if (!CALIB_BUF1_VALID_V3(buf[1]))
+		return -EINVAL;
+
+	mt->adc_oe = CALIB_BUF0_ADC_OE_V3(buf[0]);
+	mt->adc_ge = CALIB_BUF0_ADC_GE_V3(buf[0]);
+	mt->degc_cali = CALIB_BUF0_DEGC_CALI_V3(buf[0]);
+	mt->o_slope = CALIB_BUF0_O_SLOPE_V3(buf[0]);
+	mt->vts[VTS1] = CALIB_BUF1_VTS_TS1_V3(buf[1]);
+	mt->vts[VTS2] = CALIB_BUF1_VTS_TS2_V3(buf[1]);
+	mt->vts[VTSABB] = CALIB_BUF1_VTS_TSABB_V3(buf[1]);
+	mt->o_slope_sign = CALIB_BUF1_O_SLOPE_SIGN_V3(buf[1]);
+
+	if (CALIB_BUF1_ID_V3(buf[1]) == 0)
+		mt->o_slope = 0;
+
+	return 0;
+}
+
  static int mtk_thermal_get_calibration_data(struct device *dev,
  					    struct mtk_thermal *mt)
  {

@@ -897,6 +1005,7 @@ static int mtk_thermal_get_calibration_data(struct device *dev,
  	/* Start with default values */
  	mt->adc_ge = 512;
+	mt->adc_oe = 512;
  	for (i = 0; i < mt->conf->num_sensors; i++)
  		mt->vts[i] = 260;
  	mt->degc_cali = 40;

drivers/thermal/mtk_thermal.c static int mtk_thermal_get_calibration_data(struct device *dev, · line 1038

Quoted 7 lines

drivers/thermal/mtk_thermal.c +3 -1

@@ -924,8 +1033,10 @@ static int mtk_thermal_get_calibration_data(struct device *dev,
  	if (mt->conf->version == MTK_THERMAL_V1)
  		ret = mtk_thermal_extract_efuse_v1(mt, buf);
-	else
+	else if (mt->conf->version == MTK_THERMAL_V2)
  		ret = mtk_thermal_extract_efuse_v2(mt, buf);
+	else
+		ret = mtk_thermal_extract_efuse_v3(mt, buf);

I propose to use a switch here instead.

	switch(mt->conf->version) {
	case MTK_THERMAL_V1:
		....
	case MTK_THERMAL_V2:
		....
	case MTK_THERMAL_V3:
		....
	default:
		ret = -EINVAL;
		break;
	};

This would also prevent a potential issue with getting an invalid calibration due to us calling the wrong version of the get_calibration() function, in which case, using the default calibration values would be at that point preferred.

Regards,
Angelo

Hi Angelo,

Quoted 16 lines · AngeloGioacchino Del Regno

Il 30/11/22 14:19, Daniel Golle ha scritto:

Quoted 15 lines

Add support for V3 generation thermal found in MT7986 and MT7981 SoCs. Brings code to assign values from efuse as well as new function to convert raw temperature to millidegree celsius, as found in MediaTek's SDK sources (but cleaned up and de-duplicated)

[1]: https://git01.mediatek.com/plugins/gitiles/openwrt/feeds/mtk-openwrt-feeds/+/baf36c7eef477aae1f8f2653b6c29e2caf48475b

Signed-off-by Daniel Golle <[email protected]>

Reviewed-by Henry Yen <[email protected]>

---
Changes since v1: Drop use of adc_oe field in efuse, Henry Yen confirmed its use has been dropped intentionally in MTK SDK as well.

   drivers/thermal/mtk_thermal.c | 122 +++++++++++++++++++++++++++++++++-
   1 file changed, 119 insertions(+), 3 deletions(-)

Quoted 10 lines

What about optimizing this with assigning a function pointer? Like that, we wouldn't check any version in there... as in that case we'd simply do something like

temp = conf->raw_to_mcelsius(mt, conf->bank...blahblah...);

...and this would also mean that the snippet saying "the first read of a sensor often contains very high bogus temperature value [...]" would get merged in the v2 of raw_to_mcelsius (as that function is used only in mtk_thermal_bank_temperature).

I found that Amjad Ouled-Ameur is taking care of converting that series of if-else options into a function pointer allowing to easily call the right raw_to_mcelsius function.

[PATCH v7 0/4] thermal: mediatek: Add support for MT8365 SoC
https://lore.kernel.org/linux-arm-kernel/[email protected]/T/

Should I wait until this series is merged and then submit support for MT7986 thermal on top of that?