[PATCH v4 0/2] thermal: mediatek: add support for MT7986 and MT7981

[PATCH v4 0/2] thermal: mediatek: add support for MT7986 and MT7981

[Daniel Golle]

As requested in a previous review, first convert the if-else selection
of the raw_to_mcelsius_* function to instead use a function pointer
added to struct mtk_thermal. Then add thermal support for the MT7986
SoC which can also be used on MT7981.

Device Tree bindings have already been merged[1].

When submitting v3, it looked like the patch series submitted by Amjad
Ouled-Ameur ("thermal: mediatek: Add support for MT8365 SoC"[2]) which
also adds this function pointer would be merged first. However, this a
re-spin of this series addressing the comments it has received has not
yet been submitted. The change introducing the raw_to_mcelsius function
pointer is hence being applied independently.

Changes since v2: Rebase on top of pending patch introducing
raw_to_mcelsius function pointer.
Drop left-over macro extracting the unused adc_oe field.
Use switch (...) instead of if-else-if-else-... statements.
For now, return -EINVAL as default in case of unknown version. Imho
this should be BUG(), as this version is only defined within this
driver.

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.

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/thermal/linux.git//071e99848ccc1fbe238c4c9c7cfffd83f1dfe156
[2]: https://lore.kernel.org/linux-arm-kernel/4121bb6b-30db-7a23-f4c8-40afdda7a0b5@linaro.org/T/

Daniel Golle (2):
  thermal/drivers/mtk: use function pointer for raw_to_mcelsius
  thermal: mediatek: add support for MT7986 and MT7981

 drivers/thermal/mtk_thermal.c | 150 +++++++++++++++++++++++++++++++---
 1 file changed, 140 insertions(+), 10 deletions(-)

-- 
2.39.1

[PATCH v4 1/2] thermal: mediatek: use function pointer for raw_to_mcelsius

[Daniel Golle]

Instead of having if-else logic selecting either raw_to_mcelsius_v1 or
raw_to_mcelsius_v2 in mtk_thermal_bank_temperature introduce a function
pointer raw_to_mcelsius to struct mtk_thermal which is initialized in the
probe function.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
 drivers/thermal/mtk_thermal.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/thermal/mtk_thermal.c b/drivers/thermal/mtk_thermal.c
index 0084b76493d9a..992750ee09e62 100644
--- a/drivers/thermal/mtk_thermal.c
+++ b/drivers/thermal/mtk_thermal.c
@@ -292,6 +292,8 @@ struct mtk_thermal {
 
 	const struct mtk_thermal_data *conf;
 	struct mtk_thermal_bank banks[MAX_NUM_ZONES];
+
+	int (*raw_to_mcelsius)(struct mtk_thermal *mt, int sensno, s32 raw);
 };
 
 /* MT8183 thermal sensor data */
@@ -656,13 +658,9 @@ static int mtk_thermal_bank_temperature(struct mtk_thermal_bank *bank)
 	for (i = 0; i < conf->bank_data[bank->id].num_sensors; i++) {
 		raw = readl(mt->thermal_base + conf->msr[i]);
 
-		if (mt->conf->version == MTK_THERMAL_V1) {
-			temp = raw_to_mcelsius_v1(
-				mt, conf->bank_data[bank->id].sensors[i], raw);
-		} else {
-			temp = raw_to_mcelsius_v2(
-				mt, conf->bank_data[bank->id].sensors[i], raw);
-		}
+		temp = mt->raw_to_mcelsius(
+			mt, conf->bank_data[bank->id].sensors[i], raw);
+
 
 		/*
 		 * The first read of a sensor often contains very high bogus
@@ -1075,6 +1073,11 @@ static int mtk_thermal_probe(struct platform_device *pdev)
 		mtk_thermal_release_periodic_ts(mt, auxadc_base);
 	}
 
+	if (mt->conf->version == MTK_THERMAL_V1)
+		mt->raw_to_mcelsius = raw_to_mcelsius_v1;
+	else
+		mt->raw_to_mcelsius = raw_to_mcelsius_v2;
+
 	for (ctrl_id = 0; ctrl_id < mt->conf->num_controller ; ctrl_id++)
 		for (i = 0; i < mt->conf->num_banks; i++)
 			mtk_thermal_init_bank(mt, i, apmixed_phys_base,
-- 
2.39.1

Re: [PATCH v4 1/2] thermal: mediatek: use function pointer for raw_to_mcelsius

[AngeloGioacchino Del Regno]

Il 18/01/23 04:55, Daniel Golle ha scritto:
> Instead of having if-else logic selecting either raw_to_mcelsius_v1 or
> raw_to_mcelsius_v2 in mtk_thermal_bank_temperature introduce a function
> pointer raw_to_mcelsius to struct mtk_thermal which is initialized in the
> probe function.
> 
> Signed-off-by: Daniel Golle <daniel@makrotopia.org>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

[PATCH v4 2/2] thermal: mediatek: add support for MT7986 and MT7981

[Daniel Golle]

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 <daniel@makrotopia.org>
---
 drivers/thermal/mtk_thermal.c | 137 ++++++++++++++++++++++++++++++++--
 1 file changed, 132 insertions(+), 5 deletions(-)

diff --git a/drivers/thermal/mtk_thermal.c b/drivers/thermal/mtk_thermal.c
index 992750ee09e62..171f485a809bb 100644
--- a/drivers/thermal/mtk_thermal.c
+++ b/drivers/thermal/mtk_thermal.c
@@ -150,6 +150,20 @@
 #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_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 +177,7 @@ enum {
 enum mtk_thermal_version {
 	MTK_THERMAL_V1 = 1,
 	MTK_THERMAL_V2,
+	MTK_THERMAL_V3,
 };
 
 /* MT2701 thermal sensors */
@@ -245,6 +260,27 @@ 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 {
@@ -388,6 +424,14 @@ 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
@@ -551,6 +595,30 @@ 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_v1 - convert a raw ADC value to mcelsius
  * @mt:	The thermal controller
@@ -605,6 +673,22 @@ 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
@@ -885,6 +969,25 @@ 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_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)
 {
@@ -895,6 +998,7 @@ 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;
@@ -920,10 +1024,20 @@ static int mtk_thermal_get_calibration_data(struct device *dev,
 		goto out;
 	}
 
-	if (mt->conf->version == MTK_THERMAL_V1)
+	switch (mt->conf->version) {
+	case MTK_THERMAL_V1:
 		ret = mtk_thermal_extract_efuse_v1(mt, buf);
-	else
+		break;
+	case MTK_THERMAL_V2:
 		ret = mtk_thermal_extract_efuse_v2(mt, buf);
+		break;
+	case MTK_THERMAL_V3:
+		ret = mtk_thermal_extract_efuse_v3(mt, buf);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
 
 	if (ret) {
 		dev_info(dev, "Device not calibrated, using default calibration values\n");
@@ -953,6 +1067,10 @@ static const struct of_device_id mtk_thermal_of_match[] = {
 		.compatible = "mediatek,mt7622-thermal",
 		.data = (void *)&mt7622_thermal_data,
 	},
+	{
+		.compatible = "mediatek,mt7986-thermal",
+		.data = (void *)&mt7986_thermal_data,
+	},
 	{
 		.compatible = "mediatek,mt8183-thermal",
 		.data = (void *)&mt8183_thermal_data,
@@ -1068,15 +1186,24 @@ static int mtk_thermal_probe(struct platform_device *pdev)
 		goto err_disable_clk_auxadc;
 	}
 
-	if (mt->conf->version == MTK_THERMAL_V2) {
+	if (mt->conf->version != MTK_THERMAL_V1) {
 		mtk_thermal_turn_on_buffer(apmixed_base);
 		mtk_thermal_release_periodic_ts(mt, auxadc_base);
 	}
 
-	if (mt->conf->version == MTK_THERMAL_V1)
+	switch (mt->conf->version) {
+	case MTK_THERMAL_V1:
 		mt->raw_to_mcelsius = raw_to_mcelsius_v1;
-	else
+		break;
+	case MTK_THERMAL_V2:
 		mt->raw_to_mcelsius = raw_to_mcelsius_v2;
+		break;
+	case MTK_THERMAL_V3:
+		mt->raw_to_mcelsius = raw_to_mcelsius_v3;
+		break;
+	default:
+		break;
+	}
 
 	for (ctrl_id = 0; ctrl_id < mt->conf->num_controller ; ctrl_id++)
 		for (i = 0; i < mt->conf->num_banks; i++)
-- 
2.39.1

Re: [PATCH v4 2/2] thermal: mediatek: add support for MT7986 and MT7981

[AngeloGioacchino Del Regno]

Il 18/01/23 04:55, Daniel Golle ha scritto:
> 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 <daniel@makrotopia.org>
> ---
>   drivers/thermal/mtk_thermal.c | 137 ++++++++++++++++++++++++++++++++--
>   1 file changed, 132 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/thermal/mtk_thermal.c b/drivers/thermal/mtk_thermal.c
> index 992750ee09e62..171f485a809bb 100644
> --- a/drivers/thermal/mtk_thermal.c
> +++ b/drivers/thermal/mtk_thermal.c

..snip..

>   		.data = (void *)&mt8183_thermal_data,
> @@ -1068,15 +1186,24 @@ static int mtk_thermal_probe(struct platform_device *pdev)
>   		goto err_disable_clk_auxadc;
>   	}
>   
> -	if (mt->conf->version == MTK_THERMAL_V2) {
> +	if (mt->conf->version != MTK_THERMAL_V1) {
>   		mtk_thermal_turn_on_buffer(apmixed_base);
>   		mtk_thermal_release_periodic_ts(mt, auxadc_base);
>   	}
>   
> -	if (mt->conf->version == MTK_THERMAL_V1)
> +	switch (mt->conf->version) {
> +	case MTK_THERMAL_V1:
>   		mt->raw_to_mcelsius = raw_to_mcelsius_v1;
> -	else
> +		break;
> +	case MTK_THERMAL_V2:
>   		mt->raw_to_mcelsius = raw_to_mcelsius_v2;
> +		break;
> +	case MTK_THERMAL_V3:
> +		mt->raw_to_mcelsius = raw_to_mcelsius_v3;
> +		break;
> +	default:
> +		break;
> +	}

Either directly use a switch in your commit [1/2] or follow `else if` here.

I would prefer if you changed your first commit to use a switch, but I don't
really have strong opinions, which is why I gave you a Reviewed-by tag on
[1/2].

Your choice - but please don't "change the game" all of a sudden in a commit
whose purpose is to add support for a new version of MTK_THERMAL. :-)

Cheers,
Angelo