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Date: Thu, 9 Jan 2020 22:17:41 +0100
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: Florian Fainelli <f.fainelli@...il.com>,
linux-arm-kernel@...ts.infradead.org
Cc: Markus Mayer <mmayer@...adcom.com>,
"maintainer:BROADCOM STB AVS TMON DRIVER"
<bcm-kernel-feedback-list@...adcom.com>,
Zhang Rui <rui.zhang@...el.com>,
Eduardo Valentin <edubezval@...il.com>,
Amit Kucheria <amit.kucheria@...durent.com>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
"open list:BROADCOM STB AVS TMON DRIVER" <linux-pm@...r.kernel.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@...r.kernel.org>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/6] thermal: brcmstb_thermal: Prepare to support a
different process
On 11/12/2019 21:31, Florian Fainelli wrote:
> The driver is currently assuming that it is operating with a 28nm
> process chip, which has a specific formula to convert temperature to a
> code and vice versa. Update the code to support providing two key
> values: offset and multiplier to derive the correct formulas.
>
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
> drivers/thermal/broadcom/brcmstb_thermal.c | 54 ++++++++++++++++------
> 1 file changed, 39 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/thermal/broadcom/brcmstb_thermal.c b/drivers/thermal/broadcom/brcmstb_thermal.c
> index 680f1a070606..68f89f7c7e7f 100644
> --- a/drivers/thermal/broadcom/brcmstb_thermal.c
> +++ b/drivers/thermal/broadcom/brcmstb_thermal.c
> @@ -102,18 +102,27 @@ static struct avs_tmon_trip avs_tmon_trips[] = {
> },
> };
>
> +struct brcmstb_thermal_params {
> + unsigned int offset;
> + unsigned int mult;
> +};
> +
> struct brcmstb_thermal_priv {
> void __iomem *tmon_base;
> struct device *dev;
> struct thermal_zone_device *thermal;
> + /* Process specific thermal parameters used for calculations */
> + struct brcmstb_thermal_params temp_params;
> };
>
> /* Convert a HW code to a temperature reading (millidegree celsius) */
> -static inline int avs_tmon_code_to_temp(struct thermal_zone_device *tz,
> +static inline int avs_tmon_code_to_temp(struct brcmstb_thermal_priv *priv,
> u32 code)
> {
> - return (AVS_TMON_TEMP_OFFSET -
> - (int)((code & AVS_TMON_TEMP_MAX) * AVS_TMON_TEMP_SLOPE));
> + int offset = priv->temp_params.offset;
> + int mult = priv->temp_params.mult;
> +
> + return (offset - (int)((code & AVS_TMON_TEMP_MASK) * mult));
> }
>
> /*
> @@ -122,21 +131,22 @@ static inline int avs_tmon_code_to_temp(struct thermal_zone_device *tz,
> * @temp: temperature to convert
> * @low: if true, round toward the low side
> */
> -static inline u32 avs_tmon_temp_to_code(struct thermal_zone_device *tz,
> +static inline u32 avs_tmon_temp_to_code(struct brcmstb_thermal_priv *priv,
> int temp, bool low)
> {
> + int offset = priv->temp_params.offset;
> + int mult = priv->temp_params.mult;
> +
> if (temp < AVS_TMON_TEMP_MIN)
> - return AVS_TMON_TEMP_MAX; /* Maximum code value */
> + return AVS_TMON_TEMP_MASK; /* Maximum code value */
Why this change?
>
> - if (temp >= AVS_TMON_TEMP_OFFSET)
> + if (temp >= offset)
> return 0; /* Minimum code value */
>
> if (low)
> - return (u32)(DIV_ROUND_UP(AVS_TMON_TEMP_OFFSET - temp,
> - AVS_TMON_TEMP_SLOPE));
> + return (u32)(DIV_ROUND_UP(offset - temp, mult));
> else
> - return (u32)((AVS_TMON_TEMP_OFFSET - temp) /
> - AVS_TMON_TEMP_SLOPE);
> + return (u32)((offset - temp) / mult);
> }
>
> static int brcmstb_get_temp(void *data, int *temp)
> @@ -154,7 +164,7 @@ static int brcmstb_get_temp(void *data, int *temp)
>
> val = (val & AVS_TMON_STATUS_data_msk) >> AVS_TMON_STATUS_data_shift;
>
> - t = avs_tmon_code_to_temp(priv->thermal, val);
> + t = avs_tmon_code_to_temp(priv, val);
> if (t < 0)
> *temp = 0;
> else
> @@ -188,7 +198,7 @@ static int avs_tmon_get_trip_temp(struct brcmstb_thermal_priv *priv,
> val &= trip->reg_msk;
> val >>= trip->reg_shift;
>
> - return avs_tmon_code_to_temp(priv->thermal, val);
> + return avs_tmon_code_to_temp(priv, val);
> }
>
> static void avs_tmon_set_trip_temp(struct brcmstb_thermal_priv *priv,
> @@ -201,7 +211,7 @@ static void avs_tmon_set_trip_temp(struct brcmstb_thermal_priv *priv,
> dev_dbg(priv->dev, "set temp %d to %d\n", type, temp);
>
> /* round toward low temp for the low interrupt */
> - val = avs_tmon_temp_to_code(priv->thermal, temp,
> + val = avs_tmon_temp_to_code(priv, temp,
> type == TMON_TRIP_TYPE_LOW);
>
> val <<= trip->reg_shift;
> @@ -218,7 +228,7 @@ static int avs_tmon_get_intr_temp(struct brcmstb_thermal_priv *priv)
> u32 val;
>
> val = __raw_readl(priv->tmon_base + AVS_TMON_TEMP_INT_CODE);
> - return avs_tmon_code_to_temp(priv->thermal, val);
> + return avs_tmon_code_to_temp(priv, val);
> }
>
> static irqreturn_t brcmstb_tmon_irq_thread(int irq, void *data)
> @@ -282,19 +292,32 @@ static const struct thermal_zone_of_device_ops of_ops = {
> .set_trips = brcmstb_set_trips,
> };
>
> +static const struct brcmstb_thermal_params brcmstb_28nm_params = {
> + .offset = 410040,
> + .mult = 487,
> +};
> +
> static const struct of_device_id brcmstb_thermal_id_table[] = {
> - { .compatible = "brcm,avs-tmon" },
> + { .compatible = "brcm,avs-tmon", .data = &brcmstb_28nm_params },
> {},
> };
> MODULE_DEVICE_TABLE(of, brcmstb_thermal_id_table);
>
> static int brcmstb_thermal_probe(struct platform_device *pdev)
> {
> + const struct brcmstb_thermal_params *params;
> + const struct of_device_id *of_id = NULL;
> struct thermal_zone_device *thermal;
> struct brcmstb_thermal_priv *priv;
> struct resource *res;
> int irq, ret;
>
> + of_id = of_match_node(brcmstb_thermal_id_table, pdev->dev.of_node);
> + if (!of_id || !of_id->data)
> + return -EINVAL;
of_device_get_match_data(&pdev->dev) ?
> + params = of_id->data;
> +
> priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> if (!priv)
> return -ENOMEM;
> @@ -304,6 +327,7 @@ static int brcmstb_thermal_probe(struct platform_device *pdev)
> if (IS_ERR(priv->tmon_base))
> return PTR_ERR(priv->tmon_base);
>
> + memcpy(&priv->temp_params, params, sizeof(priv->temp_params));
Do you really need a copy here? Why not convert to a pointer and assign it?
> priv->dev = &pdev->dev;
> platform_set_drvdata(pdev, priv);
>
>
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