[PATCH v2 2/3] thermal: sun8i: Add support for H616 THS controller

[Andre Przywara]

On Mon, 21 Aug 2023 16:03:47 +0200
Martin Botka <martin.botka at somainline.org> wrote:

Hi,

> Add support for the thermal sensor found in H616 SoC
> which slightly resembles the H6 thermal sensor
> controller with few changes like 4 sensors.
> 
> Signed-off-by: Martin Botka <martin.botka at somainline.org>

So this doesn't work on both my OrangePi Zero3 and my X96 Mate, the
values reported are way too high. The kernel gets immediately upset
about the alleged >200C, and demands immediate shutdown.
Those are the values from hwmon on the X96 Mate:
/sys/class/hwmon/hwmon0/name:gpu_thermal
/sys/class/hwmon/hwmon0/temp1_input:220301
/sys/class/hwmon/hwmon1/name:ve_thermal
/sys/class/hwmon/hwmon1/temp1_input:219734
/sys/class/hwmon/hwmon2/name:cpu_thermal
/sys/class/hwmon/hwmon2/temp1_input:220868
/sys/class/hwmon/hwmon3/name:ddr_thermal
/sys/class/hwmon/hwmon3/temp1_input:221354
The raw values ranged from 0x273 till 0x294, with various values in
between. The reported temperatures on the OPi Zero3 were a bit lower,
but still around 200C.

The calibration data in the fuses seems to be meaningful, it says the
raw values are 0xb0f, 0xb18, 0xb14, 0xb1d for the four sensors, at an
ambient temperature of 27C. Those raw values would translate to about
34C/42C, so not completely off the scale.

This is as far as I dug today, maybe the sampling procedure is skewed,
so the ADC returns wrong values? Or the calibration write to the THS is
broken? Skipping that doesn't change the outcome significantly, though.

Open to any ideas or debugging suggestions!

Cheers,
Andre

> ---
>  drivers/thermal/sun8i_thermal.c | 74 +++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 74 insertions(+)
> 
> diff --git a/drivers/thermal/sun8i_thermal.c b/drivers/thermal/sun8i_thermal.c
> index 195f3c5d0b38..cf96ab6a445b 100644
> --- a/drivers/thermal/sun8i_thermal.c
> +++ b/drivers/thermal/sun8i_thermal.c
> @@ -278,6 +278,66 @@ static int sun50i_h6_ths_calibrate(struct ths_device *tmdev,
>  	return 0;
>  }
>  
> +static int sun50i_h616_ths_calibrate(struct ths_device *tmdev,
> +				     u16 *caldata, int callen)
> +{
> +	struct device *dev = tmdev->dev;
> +	int i, ft_temp;
> +
> +	if (!caldata[0])
> +		return -EINVAL;
> +
> +	/*
> +	 * h616 efuse THS calibration data layout:
> +	 *
> +	 * 0      11  16     27   32     43   48    57
> +	 * +----------+-----------+-----------+-----------+
> +	 * |  temp |  |sensor0|   |sensor1|   |sensor2|   |
> +	 * +----------+-----------+-----------+-----------+
> +	 *                      ^           ^           ^
> +	 *                      |           |           |
> +	 *                      |           |           sensor3[11:8]
> +	 *                      |           sensor3[7:4]
> +	 *                      sensor3[3:0]
> +	 *
> +	 * The calibration data on the H616 is the ambient temperature and
> +	 * sensor values that are filled during the factory test stage.
> +	 *
> +	 * The unit of stored FT temperature is 0.1 degree celsius.
> +	 */
> +	ft_temp = caldata[0] & FT_TEMP_MASK;
> +
> +	for (i = 0; i < tmdev->chip->sensor_num; i++) {
> +		int delta, cdata, offset, reg;
> +
> +		if (i == 3)
> +			reg = (caldata[1] >> 12)
> +			      | ((caldata[2] >> 12) << 4)
> +			      | ((caldata[3] >> 12) << 8);
> +		else
> +			reg = (int)caldata[i + 1] & TEMP_CALIB_MASK;
> +
> +		int sensor_temp = tmdev->chip->calc_temp(tmdev, i, reg);
> +
> +		delta = (sensor_temp - ft_temp * 100) * 10;
> +		delta /= tmdev->chip->scale;
> +		cdata = CALIBRATE_DEFAULT - delta;
> +		if (cdata & ~TEMP_CALIB_MASK) {
> +			dev_warn(dev, "sensor%d is not calibrated.\n", i);
> +
> +			continue;
> +		}
> +
> +		offset = (i % 2) * 16;
> +		regmap_update_bits(tmdev->regmap,
> +				   SUN50I_H6_THS_TEMP_CALIB + (i / 2 * 4),
> +				   TEMP_CALIB_MASK << offset,
> +				   cdata << offset);
> +	}
> +
> +	return 0;
> +}
> +
>  static int sun8i_ths_calibrate(struct ths_device *tmdev)
>  {
>  	struct nvmem_cell *calcell;
> @@ -608,6 +668,19 @@ static const struct ths_thermal_chip sun50i_h6_ths = {
>  	.calc_temp = sun8i_ths_calc_temp,
>  };
>  
> +static const struct ths_thermal_chip sun50i_h616_ths = {
> +	.sensor_num = 4,
> +	.has_bus_clk_reset = true,
> +	.ft_deviation = 8000,
> +	.offset = 263655,
> +	.scale = 810,
> +	.temp_data_base = SUN50I_H6_THS_TEMP_DATA,
> +	.calibrate = sun50i_h616_ths_calibrate,
> +	.init = sun50i_h6_thermal_init,
> +	.irq_ack = sun50i_h6_irq_ack,
> +	.calc_temp = sun8i_ths_calc_temp,
> +};
> +
>  static const struct of_device_id of_ths_match[] = {
>  	{ .compatible = "allwinner,sun8i-a83t-ths", .data = &sun8i_a83t_ths },
>  	{ .compatible = "allwinner,sun8i-h3-ths", .data = &sun8i_h3_ths },
> @@ -616,6 +689,7 @@ static const struct of_device_id of_ths_match[] = {
>  	{ .compatible = "allwinner,sun50i-a100-ths", .data = &sun50i_a100_ths },
>  	{ .compatible = "allwinner,sun50i-h5-ths", .data = &sun50i_h5_ths },
>  	{ .compatible = "allwinner,sun50i-h6-ths", .data = &sun50i_h6_ths },
> +	{ .compatible = "allwinner,sun50i-h616-ths", .data = &sun50i_h616_ths },
>  	{ /* sentinel */ },
>  };
>  MODULE_DEVICE_TABLE(of, of_ths_match);
>