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Date:   Sun, 17 May 2020 15:58:48 +0530
From:   manafm@...eaurora.org
To:     Amit Kucheria <amit.kucheria@...aro.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-arm-msm <linux-arm-msm@...r.kernel.org>,
        Linux PM list <linux-pm@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] drivers: thermal: tsens: Add 0C (zeorC) interrupt
 support

On 2020-05-05 17:39, Amit Kucheria wrote:
> Hi Manaf,
> 
> Typo: fix zeorC in subject line.
Done
> 
> Please rebase this patch[1] on top of my patch merging tsens-common.c
> and tsens.c.
> 
> [1]
> https://lore.kernel.org/linux-arm-msm/e30e2ba6fa5c007983afd4d7d4e0311c0b57917a.1588183879.git.amit.kucheria@linaro.org/
Done
> 
> On Tue, May 5, 2020 at 4:42 PM Manaf Meethalavalappu Pallikunhi
> <manafm@...eaurora.org> wrote:
>> 
>> TSENS IP v2.6+ adds 0C interrupt support. It triggers set
>> interrupt when aggregated minimum temperature of all TSENS falls
>> below 0C preset threshold and triggers reset interrupt when aggregate
>> minimum temperature of all TSENS crosses above reset threshold.
>> Add support for this interrupt in the driver.
>> 
>> It adds another sensor to the of-thermal along with all individual
>> TSENS. It enables to add any mitigation for 0C interrupt.
>> 
>> Signed-off-by: Manaf Meethalavalappu Pallikunhi 
>> <manafm@...eaurora.org>
>> ---
>>  drivers/thermal/qcom/tsens-common.c | 72 
>> ++++++++++++++++++++++++++++-
>>  drivers/thermal/qcom/tsens-v2.c     |  7 +++
>>  drivers/thermal/qcom/tsens.c        | 51 ++++++++++++++++++--
>>  drivers/thermal/qcom/tsens.h        | 11 +++++
>>  4 files changed, 135 insertions(+), 6 deletions(-)
>> 
>> diff --git a/drivers/thermal/qcom/tsens-common.c 
>> b/drivers/thermal/qcom/tsens-common.c
>> index 172545366636..44e7edeb9a90 100644
>> --- a/drivers/thermal/qcom/tsens-common.c
>> +++ b/drivers/thermal/qcom/tsens-common.c
>> @@ -198,7 +198,8 @@ static void tsens_set_interrupt_v1(struct 
>> tsens_priv *priv, u32 hw_id,
>>                 index = LOW_INT_CLEAR_0 + hw_id;
>>                 break;
>>         case CRITICAL:
>> -               /* No critical interrupts before v2 */
>> +       case ZEROC:
>> +               /* No critical and 0c interrupts before v2 */
>>                 return;
>>         }
>>         regmap_field_write(priv->rf[index], enable ? 0 : 1);
>> @@ -229,6 +230,9 @@ static void tsens_set_interrupt_v2(struct 
>> tsens_priv *priv, u32 hw_id,
>>                 index_mask  = CRIT_INT_MASK_0 + hw_id;
>>                 index_clear = CRIT_INT_CLEAR_0 + hw_id;
>>                 break;
>> +       case ZEROC:
>> +               /* Nothing to handle for 0c interrupt */
>> +               return;
>>         }
>> 
>>         if (enable) {
>> @@ -360,6 +364,34 @@ static inline u32 masked_irq(u32 hw_id, u32 mask, 
>> enum tsens_ver ver)
>>         return 0;
>>  }
>> 
>> +/**
>> + * tsens_0c_irq_thread - Threaded interrupt handler for 0c interrupt
> 
> Let's use zeroc instead of 0c in the function and variable names and
> comments everywhere. Easier to grep and better consistency too.
Done
> 
>> + * @irq: irq number
>> + * @data: tsens controller private data
>> + *
>> + * Whenever interrupt triggers notify thermal framework using
>> + * thermal_zone_device_update() to update cold temperature 
>> mitigation.
> 
> How is this mitigation updated?
Updated comment section
>> + *
>> + * Return: IRQ_HANDLED
>> + */
>> +irqreturn_t tsens_0c_irq_thread(int irq, void *data)
>> +{
>> +       struct tsens_priv *priv = data;
>> +       struct tsens_sensor *s = &priv->sensor[priv->num_sensors];
>> +       int temp, ret;
>> +
>> +       ret = regmap_field_read(priv->rf[TSENS_0C_STATUS], &temp);
>> +       if (ret)
>> +               return ret;
>> +
>> +       dev_dbg(priv->dev, "[%u] %s: 0c interrupt is %s\n",
>> +               s->hw_id, __func__, temp ? "triggered" : "cleared");
> 
> So triggered is printed for non-zero (including negative) values?
This zeroc hardware generates each interrupt when any of the TSENS that 
it monitors goes below 5C or above 10c. These thresholds are not 
configurable. Hence we don't expect this to be changed from kernel side.
So this sensor (status register) will read 0 or 1.  1 means soc 
temperature is in cold condition and 0 means it is in normal 
temperature.
> 
>> +
>> +       thermal_zone_device_update(s->tzd, THERMAL_EVENT_UNSPECIFIED);
>> +
>> +       return IRQ_HANDLED;
>> +}
>> +
>>  /**
>>   * tsens_critical_irq_thread() - Threaded handler for critical 
>> interrupts
>>   * @irq: irq number
>> @@ -566,6 +598,20 @@ void tsens_disable_irq(struct tsens_priv *priv)
>>         regmap_field_write(priv->rf[INT_EN], 0);
>>  }
>> 
>> +int tsens_get_0c_int_status(const struct tsens_sensor *s, int *temp)
>> +{
>> +       struct tsens_priv *priv = s->priv;
>> +       int last_temp = 0, ret;
>> +
>> +       ret = regmap_field_read(priv->rf[TSENS_0C_STATUS], 
>> &last_temp);
>> +       if (ret)
>> +               return ret;
>> +
>> +       *temp = last_temp;
>> +
>> +       return 0;
>> +}
>> +
>>  int get_temp_tsens_valid(const struct tsens_sensor *s, int *temp)
>>  {
>>         struct tsens_priv *priv = s->priv;
>> @@ -833,6 +879,30 @@ int __init init_common(struct tsens_priv *priv)
>>                 regmap_field_write(priv->rf[CC_MON_MASK], 1);
>>         }
>> 
>> +       if (tsens_version(priv) > VER_1_X &&  ver_minor > 5) {
>> +               /* 0C interrupt is present only on v2.6+ */
>> +               priv->rf[TSENS_0C_INT_EN] = 
>> devm_regmap_field_alloc(dev,
>> +                                               priv->srot_map,
>> +                                               
>> priv->fields[TSENS_0C_INT_EN]);
>> +               if (IS_ERR(priv->rf[TSENS_0C_INT_EN])) {
>> +                       ret = PTR_ERR(priv->rf[TSENS_0C_INT_EN]);
>> +                       goto err_put_device;
>> +               }
>> +
>> +               /* Check whether 0C interrupt is enabled or not */
>> +               regmap_field_read(priv->rf[TSENS_0C_INT_EN], 
>> &enabled);
>> +               if (enabled) {
>> +                       priv->feat->zero_c_int = 1;
> 
> This should be done at the beginning of the block where you check our
> version is > 2.6 since the flag only says whether the feature is
> present.
Done
> 
>> +                       priv->rf[TSENS_0C_STATUS] = 
>> devm_regmap_field_alloc(dev,
>> +                                               priv->tm_map,
>> +                                               
>> priv->fields[TSENS_0C_STATUS]);
>> +                       if (IS_ERR(priv->rf[TSENS_0C_STATUS])) {
>> +                               ret = 
>> PTR_ERR(priv->rf[TSENS_0C_STATUS]);
>> +                               goto err_put_device;
>> +                       }
>> +               }
>> +       }
>> +
>>         spin_lock_init(&priv->ul_lock);
>>         tsens_enable_irq(priv);
>>         tsens_debug_init(op);
>> diff --git a/drivers/thermal/qcom/tsens-v2.c 
>> b/drivers/thermal/qcom/tsens-v2.c
>> index b293ed32174b..ce80d82c7255 100644
>> --- a/drivers/thermal/qcom/tsens-v2.c
>> +++ b/drivers/thermal/qcom/tsens-v2.c
>> @@ -11,6 +11,7 @@
>>  /* ----- SROT ------ */
>>  #define SROT_HW_VER_OFF        0x0000
>>  #define SROT_CTRL_OFF          0x0004
>> +#define SROT_OC_CTRL_OFF       0x0018
>> 
>>  /* ----- TM ------ */
>>  #define TM_INT_EN_OFF                  0x0004
>> @@ -23,6 +24,7 @@
>>  #define TM_Sn_UPPER_LOWER_THRESHOLD_OFF 0x0020
>>  #define TM_Sn_CRITICAL_THRESHOLD_OFF   0x0060
>>  #define TM_Sn_STATUS_OFF               0x00a0
>> +#define TM_0C_INT_STATUS_OFF           0x00e0
>>  #define TM_TRDY_OFF                    0x00e4
>>  #define TM_WDOG_LOG_OFF                0x013c
>> 
>> @@ -45,6 +47,7 @@ static const struct reg_field 
>> tsens_v2_regfields[MAX_REGFIELDS] = {
>>         /* CTRL_OFF */
>>         [TSENS_EN]     = REG_FIELD(SROT_CTRL_OFF,    0,  0),
>>         [TSENS_SW_RST] = REG_FIELD(SROT_CTRL_OFF,    1,  1),
>> +       [TSENS_0C_INT_EN] = REG_FIELD(SROT_OC_CTRL_OFF, 0,  0),
>> 
>>         /* ----- TM ------ */
>>         /* INTERRUPT ENABLE */
>> @@ -86,6 +89,9 @@ static const struct reg_field 
>> tsens_v2_regfields[MAX_REGFIELDS] = {
>>         REG_FIELD_FOR_EACH_SENSOR16(CRITICAL_STATUS, TM_Sn_STATUS_OFF, 
>> 19,  19),
>>         REG_FIELD_FOR_EACH_SENSOR16(MAX_STATUS,      TM_Sn_STATUS_OFF, 
>> 20,  20),
>> 
>> +       /* 0C INETRRUPT STATUS */
> 
> Typo: Interrupt
> 
>> +       [TSENS_0C_STATUS] = REG_FIELD(TM_0C_INT_STATUS_OFF, 0, 0),
>> +
>>         /* TRDY: 1=ready, 0=in progress */
>>         [TRDY] = REG_FIELD(TM_TRDY_OFF, 0, 0),
>>  };
>> @@ -93,6 +99,7 @@ static const struct reg_field 
>> tsens_v2_regfields[MAX_REGFIELDS] = {
>>  static const struct tsens_ops ops_generic_v2 = {
>>         .init           = init_common,
>>         .get_temp       = get_temp_tsens_valid,
>> +       .get_0c_status  = tsens_get_0c_int_status,
>>  };
>> 
>>  struct tsens_plat_data data_tsens_v2 = {
>> diff --git a/drivers/thermal/qcom/tsens.c 
>> b/drivers/thermal/qcom/tsens.c
>> index 2f77d235cf73..e60870c53383 100644
>> --- a/drivers/thermal/qcom/tsens.c
>> +++ b/drivers/thermal/qcom/tsens.c
>> @@ -14,6 +14,17 @@
>>  #include <linux/thermal.h>
>>  #include "tsens.h"
>> 
>> +static int tsens_0c_get_temp(void *data, int *temp)
>> +{
>> +       struct tsens_sensor *s = data;
>> +       struct tsens_priv *priv = s->priv;
>> +
>> +       if (priv->ops->get_0c_status)
>> +               return priv->ops->get_0c_status(s, temp);
>> +
>> +       return -ENOTSUPP;
>> +}
>> +
>>  static int tsens_get_temp(void *data, int *temp)
>>  {
>>         struct tsens_sensor *s = data;
>> @@ -85,6 +96,10 @@ static const struct thermal_zone_of_device_ops 
>> tsens_of_ops = {
>>         .set_trips = tsens_set_trips,
>>  };
>> 
>> +static const struct thermal_zone_of_device_ops tsens_0c_of_ops = {
>> +       .get_temp = tsens_0c_get_temp,
>> +};
>> +
>>  static int tsens_register_irq(struct tsens_priv *priv, char *irqname,
>>                               irq_handler_t thread_fn)
>>  {
>> @@ -142,6 +157,21 @@ static int tsens_register(struct tsens_priv 
>> *priv)
>>                 ret = tsens_register_irq(priv, "critical",
>>                                          tsens_critical_irq_thread);
>> 
>> +       if (priv->feat->zero_c_int) {
>> +               priv->sensor[priv->num_sensors].priv = priv;
>> +               tzd = devm_thermal_zone_of_sensor_register(priv->dev,
>> +                                       
>> priv->sensor[priv->num_sensors].hw_id,
>> +                                       
>> &priv->sensor[priv->num_sensors],
>> +                                       &tsens_0c_of_ops);
>> +               if (IS_ERR(tzd)) {
>> +                       ret = 0;
>> +                       return ret;
>> +               }
>> +
>> +               priv->sensor[priv->num_sensors].tzd = tzd;
> 
> Why can't this happen in the previous loop, but increase the loop to
> <= num_sensors? It is duplicated code.
I think if i change  default loop logic to <= num_sensors, it will break 
other legacy targets, right ?
My idea is to guard all changes related to zeroc under zeroc related 
feature flag.
Again, since we cannot configure any threshold from kernel side, there 
is no set_trip ops for this sensor, so we need to call register function 
differently in compared to regular sensor
> 
>> +               ret = tsens_register_irq(priv, "zeroc", 
>> tsens_0c_irq_thread);
>> +       }
>> +
>>         return ret;
>>  }
>> 
>> @@ -178,11 +208,22 @@ static int tsens_probe(struct platform_device 
>> *pdev)
>>                 return -EINVAL;
>>         }
>> 
>> -       priv = devm_kzalloc(dev,
>> -                            struct_size(priv, sensor, num_sensors),
>> -                            GFP_KERNEL);
>> -       if (!priv)
>> -               return -ENOMEM;
>> +       /* Check for 0c interrupt is enabled or not */
>> +       if (platform_get_irq_byname(pdev, "zeroc") > 0) {
>> +               priv = devm_kzalloc(dev,
>> +                               struct_size(priv, sensor, num_sensors 
>> + 1),
>> +                               GFP_KERNEL);
> 
> Instead of doing this, simply do the following,
> 
> if (platform_get_irq_byname(pdev, "zeroc") > 0) {
>         num_sensors++;
> 
> The kzalloc will just work then, no?
I just changed logic in v2.  Basically this zeroc feature is an 
optional. There is a chance that we don't need to enable in software 
even though hardware support is present.
So I used another variable to check whether feature is enabled or not by 
checking DT interrupt configuration.
> 
>> +               if (!priv)
>> +                       return -ENOMEM;
>> +               /* Use Max sensor index as 0c sensor hw_id */
>> +               priv->sensor[num_sensors].hw_id = 
>> data->feat->max_sensors;
>> +       } else {
>> +               priv = devm_kzalloc(dev,
>> +                               struct_size(priv, sensor, 
>> num_sensors),
>> +                               GFP_KERNEL);
>> +               if (!priv)
>> +                       return -ENOMEM;
>> +       }
>> 
>>         priv->dev = dev;
>>         priv->num_sensors = num_sensors;
>> diff --git a/drivers/thermal/qcom/tsens.h 
>> b/drivers/thermal/qcom/tsens.h
>> index 502acf0e6828..5b53a0352b4d 100644
>> --- a/drivers/thermal/qcom/tsens.h
>> +++ b/drivers/thermal/qcom/tsens.h
>> @@ -34,6 +34,7 @@ enum tsens_irq_type {
>>         LOWER,
>>         UPPER,
>>         CRITICAL,
>> +       ZEROC,
>>  };
>> 
>>  /**
>> @@ -64,6 +65,7 @@ struct tsens_sensor {
>>   * @suspend: Function to suspend the tsens device
>>   * @resume: Function to resume the tsens device
>>   * @get_trend: Function to get the thermal/temp trend
>> + * @get_0c_status: Function to get the 0c interrupt status
>>   */
>>  struct tsens_ops {
>>         /* mandatory callbacks */
>> @@ -76,6 +78,7 @@ struct tsens_ops {
>>         int (*suspend)(struct tsens_priv *priv);
>>         int (*resume)(struct tsens_priv *priv);
>>         int (*get_trend)(struct tsens_sensor *s, enum thermal_trend 
>> *trend);
>> +       int (*get_0c_status)(const struct tsens_sensor *s, int *temp);
>>  };
>> 
>>  #define REG_FIELD_FOR_EACH_SENSOR11(_name, _offset, _startbit, 
>> _stopbit) \
>> @@ -161,6 +164,8 @@ enum regfield_ids {
>>         TSENS_SW_RST,
>>         SENSOR_EN,
>>         CODE_OR_TEMP,
>> +       /* 0C CTRL OFFSET */
>> +       TSENS_0C_INT_EN,
>> 
>>         /* ----- TM ------ */
>>         /* TRDY */
>> @@ -485,6 +490,8 @@ enum regfield_ids {
>>         MAX_STATUS_14,
>>         MAX_STATUS_15,
>> 
>> +       TSENS_0C_STATUS,        /* 0C INTERRUPT status */
>> +
>>         /* Keep last */
>>         MAX_REGFIELDS
>>  };
>> @@ -497,6 +504,7 @@ enum regfield_ids {
>>   * @srot_split: does the IP neatly splits the register space into 
>> SROT and TM,
>>   *              with SROT only being available to secure boot 
>> firmware?
>>   * @has_watchdog: does this IP support watchdog functionality?
>> + * @zero_c_int: does this IP support 0C interrupt ?
>>   * @max_sensors: maximum sensors supported by this version of the IP
>>   */
>>  struct tsens_features {
>> @@ -505,6 +513,7 @@ struct tsens_features {
>>         unsigned int adc:1;
>>         unsigned int srot_split:1;
>>         unsigned int has_watchdog:1;
>> +       unsigned int zero_c_int:1;
> 
> zeroc_interrupt
Done
> 
>>         unsigned int max_sensors;
>>  };
>> 
>> @@ -580,11 +589,13 @@ void compute_intercept_slope(struct tsens_priv 
>> *priv, u32 *pt1, u32 *pt2, u32 mo
>>  int init_common(struct tsens_priv *priv);
>>  int get_temp_tsens_valid(const struct tsens_sensor *s, int *temp);
>>  int get_temp_common(const struct tsens_sensor *s, int *temp);
>> +int tsens_get_0c_int_status(const struct tsens_sensor *s, int *temp);
>>  int tsens_enable_irq(struct tsens_priv *priv);
>>  void tsens_disable_irq(struct tsens_priv *priv);
>>  int tsens_set_trips(void *_sensor, int low, int high);
>>  irqreturn_t tsens_irq_thread(int irq, void *data);
>>  irqreturn_t tsens_critical_irq_thread(int irq, void *data);
>> +irqreturn_t tsens_0c_irq_thread(int irq, void *data);
>> 
>>  /* TSENS target */
>>  extern struct tsens_plat_data data_8960;
>> --
>> 2.26.2

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