linux-kernel - Re: [PATCH v10 6/8] drivers: thermal: tsens: Use get_temp

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Date:   Thu, 18 Mar 2021 17:15:53 -0400
From:   Thara Gopinath <thara.gopinath@...aro.org>
To:     Ansuel Smith <ansuelsmth@...il.com>,
        Amit Kucheria <amitk@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, linux-pm@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v10 6/8] drivers: thermal: tsens: Use get_temp_common for
 msm8960



On 2/17/21 2:40 PM, Ansuel Smith wrote:
> Rework calibrate function to use common function. Derive the offset from
> a missing hardcoded slope table and the data from the nvmem calib
> efuses.

You are also changing get_temp to use get_temp_common instead of 
get_temp_8960 in this patch. Please add it to commit description as 
well.I will also consider changing the subject header to something more 
generic like
	"drivers: thermal: tsens: Replace custom 8960 apis with generic apis"
or anything better.

Otherwise,
Acked-by: Thara Gopinath <thara.gopinath@...aro.org>

Warm Regards
Thara

> 
> Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> ---
>   drivers/thermal/qcom/tsens-8960.c | 56 +++++++++----------------------
>   1 file changed, 15 insertions(+), 41 deletions(-)
> 
> diff --git a/drivers/thermal/qcom/tsens-8960.c b/drivers/thermal/qcom/tsens-8960.c
> index 248aaa65b5b0..43ebe4d54672 100644
> --- a/drivers/thermal/qcom/tsens-8960.c
> +++ b/drivers/thermal/qcom/tsens-8960.c
> @@ -67,6 +67,13 @@
>   #define S9_STATUS_OFF		0x3674
>   #define S10_STATUS_OFF		0x3678
>   
> +/* Original slope - 200 to compensate mC to C inaccuracy */
> +u32 tsens_msm8960_slope[] = {
> +			976, 976, 954, 976,
> +			911, 932, 932, 999,
> +			932, 999, 932
> +			};
> +
>   static int suspend_8960(struct tsens_priv *priv)
>   {
>   	int ret;
> @@ -192,9 +199,7 @@ static int calibrate_8960(struct tsens_priv *priv)
>   {
>   	int i;
>   	char *data;
> -
> -	ssize_t num_read = priv->num_sensors;
> -	struct tsens_sensor *s = priv->sensor;
> +	u32 p1[11];
>   
>   	data = qfprom_read(priv->dev, "calib");
>   	if (IS_ERR(data))
> @@ -202,49 +207,18 @@ static int calibrate_8960(struct tsens_priv *priv)
>   	if (IS_ERR(data))
>   		return PTR_ERR(data);
>   
> -	for (i = 0; i < num_read; i++, s++)
> -		s->offset = data[i];
> +	for (i = 0; i < priv->num_sensors; i++) {
> +		p1[i] = data[i];
> +		priv->sensor[i].slope = tsens_msm8960_slope[i];
> +	}
> +
> +	compute_intercept_slope(priv, p1, NULL, ONE_PT_CALIB);
>   
>   	kfree(data);
>   
>   	return 0;
>   }
>   
> -/* Temperature on y axis and ADC-code on x-axis */
> -static inline int code_to_mdegC(u32 adc_code, const struct tsens_sensor *s)
> -{
> -	int slope, offset;
> -
> -	slope = thermal_zone_get_slope(s->tzd);
> -	offset = CAL_MDEGC - slope * s->offset;
> -
> -	return adc_code * slope + offset;
> -}
> -
> -static int get_temp_8960(const struct tsens_sensor *s, int *temp)
> -{
> -	int ret;
> -	u32 code, trdy;
> -	struct tsens_priv *priv = s->priv;
> -	unsigned long timeout;
> -
> -	timeout = jiffies + usecs_to_jiffies(TIMEOUT_US);
> -	do {
> -		ret = regmap_read(priv->tm_map, INT_STATUS_ADDR, &trdy);
> -		if (ret)
> -			return ret;
> -		if (!(trdy & TRDY_MASK))
> -			continue;
> -		ret = regmap_read(priv->tm_map, s->status, &code);
> -		if (ret)
> -			return ret;
> -		*temp = code_to_mdegC(code, s);
> -		return 0;
> -	} while (time_before(jiffies, timeout));
> -
> -	return -ETIMEDOUT;
> -}
> -
>   static struct tsens_features tsens_8960_feat = {
>   	.ver_major	= VER_0,
>   	.crit_int	= 0,
> @@ -313,7 +287,7 @@ static const struct reg_field tsens_8960_regfields[MAX_REGFIELDS] = {
>   static const struct tsens_ops ops_8960 = {
>   	.init		= init_common,
>   	.calibrate	= calibrate_8960,
> -	.get_temp	= get_temp_8960,
> +	.get_temp	= get_temp_common,
>   	.enable		= enable_8960,
>   	.disable	= disable_8960,
>   	.suspend	= suspend_8960,
>