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Date: Tue, 21 Mar 2023 17:34:11 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: David Collins <quic_collinsd@...cinc.com>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
"Rafael J . Wysocki" <rafael@...nel.org>,
Amit Kucheria <amitk@...nel.org>,
Thara Gopinath <thara.gopinath@...il.com>,
Andy Gross <agross@...nel.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>
Cc: Konrad Dybcio <konrad.dybcio@...ainline.org>,
Zhang Rui <rui.zhang@...el.com>, linux-arm-msm@...r.kernel.org,
linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH v3 3/3] thermal: qcom-spmi-temp-alarm: add support
for LITE PMIC peripherals
On 25/01/2023 01:46, David Collins wrote:
> Add support for TEMP_ALARM LITE PMIC peripherals. This subtype
> utilizes a pair of registers to configure a warning interrupt
> threshold temperature and an automatic hardware shutdown
> threshold temperature.
This adds additional DT requirements to the lite temp-alarm trip points.
Please consider adding a separate DT compatible string and describing
these details in DT bindings. And the commit message _must_ also
describe them.
>
> Signed-off-by: David Collins <quic_collinsd@...cinc.com>
> ---
> drivers/thermal/qcom/qcom-spmi-temp-alarm.c | 217 +++++++++++++++++++-
> 1 file changed, 208 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/thermal/qcom/qcom-spmi-temp-alarm.c b/drivers/thermal/qcom/qcom-spmi-temp-alarm.c
> index 1fe8ff7a274e..dbf13dec7acd 100644
> --- a/drivers/thermal/qcom/qcom-spmi-temp-alarm.c
> +++ b/drivers/thermal/qcom/qcom-spmi-temp-alarm.c
> @@ -4,6 +4,7 @@
> * Copyright (c) 2022, Qualcomm Innovation Center, Inc. All rights reserved.
> */
>
> +#include <linux/bitfield.h>
> #include <linux/bitops.h>
> #include <linux/delay.h>
> #include <linux/err.h>
> @@ -24,21 +25,28 @@
> #define QPNP_TM_REG_TYPE 0x04
> #define QPNP_TM_REG_SUBTYPE 0x05
> #define QPNP_TM_REG_STATUS 0x08
> +#define QPNP_TM_REG_IRQ_STATUS 0x10
> #define QPNP_TM_REG_SHUTDOWN_CTRL1 0x40
> #define QPNP_TM_REG_ALARM_CTRL 0x46
> /* TEMP_DAC_* registers are only present for TEMP_GEN2 v2.0 */
> #define QPNP_TM_REG_TEMP_DAC_STG1 0x47
> #define QPNP_TM_REG_TEMP_DAC_STG2 0x48
> #define QPNP_TM_REG_TEMP_DAC_STG3 0x49
> +#define QPNP_TM_REG_LITE_TEMP_CFG1 0x50
> +#define QPNP_TM_REG_LITE_TEMP_CFG2 0x51
>
> #define QPNP_TM_TYPE 0x09
> #define QPNP_TM_SUBTYPE_GEN1 0x08
> #define QPNP_TM_SUBTYPE_GEN2 0x09
> +#define QPNP_TM_SUBTYPE_LITE 0xC0
>
> #define STATUS_GEN1_STAGE_MASK GENMASK(1, 0)
> #define STATUS_GEN2_STATE_MASK GENMASK(6, 4)
> #define STATUS_GEN2_STATE_SHIFT 4
>
> +/* IRQ status only needed for TEMP_ALARM_LITE */
> +#define IRQ_STATUS_MASK BIT(0)
> +
> #define SHUTDOWN_CTRL1_OVERRIDE_S2 BIT(6)
> #define SHUTDOWN_CTRL1_THRESHOLD_MASK GENMASK(1, 0)
>
> @@ -46,6 +54,8 @@
>
> #define ALARM_CTRL_FORCE_ENABLE BIT(7)
>
> +#define LITE_TEMP_CFG_THRESHOLD_MASK GENMASK(3, 2)
> +
> #define THRESH_COUNT 4
> #define STAGE_COUNT 3
>
> @@ -90,6 +100,19 @@ static const long temp_dac_max[STAGE_COUNT] = {
> 119375, 159375, 159375
> };
>
> +/*
> + * TEMP_ALARM_LITE has two stages: warning and shutdown with independently
> + * configured threshold temperatures.
> + */
> +
> +static const long temp_map_lite_warning[THRESH_COUNT] = {
> + 115000, 125000, 135000, 145000
> +};
> +
> +static const long temp_map_lite_shutdown[THRESH_COUNT] = {
> + 135000, 145000, 160000, 175000
> +};
> +
> /* Temperature in Milli Celsius reported during stage 0 if no ADC is present */
> #define DEFAULT_TEMP 37000
>
> @@ -146,7 +169,7 @@ static int qpnp_tm_write(struct qpnp_tm_chip *chip, u16 addr, u8 data)
> */
> static long qpnp_tm_decode_temp(struct qpnp_tm_chip *chip, unsigned int stage)
> {
> - if (chip->has_temp_dac) {
> + if (chip->has_temp_dac || chip->subtype == QPNP_TM_SUBTYPE_LITE) {
> if (stage == 0 || stage > STAGE_COUNT)
> return 0;
>
> @@ -164,19 +187,26 @@ static long qpnp_tm_decode_temp(struct qpnp_tm_chip *chip, unsigned int stage)
> * qpnp_tm_get_temp_stage() - return over-temperature stage
> * @chip: Pointer to the qpnp_tm chip
> *
> - * Return: stage (GEN1) or state (GEN2) on success, or errno on failure.
> + * Return: stage (GEN1), state (GEN2), or alarm interrupt state (LITE) on
> + * success; or errno on failure.
> */
> static int qpnp_tm_get_temp_stage(struct qpnp_tm_chip *chip)
> {
> int ret;
> + u16 addr = QPNP_TM_REG_STATUS;
> u8 reg = 0;
>
> - ret = qpnp_tm_read(chip, QPNP_TM_REG_STATUS, ®);
> + if (chip->subtype == QPNP_TM_SUBTYPE_LITE)
> + addr = QPNP_TM_REG_IRQ_STATUS;
> +
> + ret = qpnp_tm_read(chip, addr, ®);
> if (ret < 0)
> return ret;
>
> if (chip->subtype == QPNP_TM_SUBTYPE_GEN1)
> ret = reg & STATUS_GEN1_STAGE_MASK;
> + else if (chip->subtype == QPNP_TM_SUBTYPE_LITE)
> + ret = reg & IRQ_STATUS_MASK;
> else
> ret = (reg & STATUS_GEN2_STATE_MASK) >> STATUS_GEN2_STATE_SHIFT;
>
> @@ -199,7 +229,8 @@ static int qpnp_tm_update_temp_no_adc(struct qpnp_tm_chip *chip)
> return ret;
> stage = ret;
>
> - if (chip->subtype == QPNP_TM_SUBTYPE_GEN1) {
> + if (chip->subtype == QPNP_TM_SUBTYPE_GEN1
> + || chip->subtype == QPNP_TM_SUBTYPE_LITE) {
> stage_new = stage;
> stage_old = chip->stage;
> } else {
> @@ -282,6 +313,78 @@ static int qpnp_tm_set_temp_dac_thresh(struct qpnp_tm_chip *chip, int trip,
> return 0;
> }
>
> +static int qpnp_tm_set_temp_lite_thresh(struct qpnp_tm_chip *chip, int trip,
> + int temp)
> +{
> + int ret, temp_cfg, i;
> + const long *temp_map;
> + u16 addr;
> + u8 reg, thresh;
> +
> + if (trip < 0 || trip >= STAGE_COUNT) {
> + dev_err(chip->dev, "invalid TEMP_LITE trip = %d\n", trip);
> + return -EINVAL;
> + }
> +
> + switch (trip) {
> + case 0:
> + temp_map = temp_map_lite_warning;
> + addr = QPNP_TM_REG_LITE_TEMP_CFG1;
> + break;
> + case 1:
> + /*
> + * The second trip point is purely in software to facilitate
> + * a controlled shutdown after the warning threshold is crossed
> + * but before the automatic hardware shutdown threshold is
> + * crossed.
> + */
> + return 0;
> + case 2:
> + temp_map = temp_map_lite_shutdown;
> + addr = QPNP_TM_REG_LITE_TEMP_CFG2;
> + break;
> + default:
> + return 0;
> + }
> +
> + if (temp < temp_map[THRESH_MIN] || temp > temp_map[THRESH_MAX]) {
> + dev_err(chip->dev, "invalid TEMP_LITE temp = %d\n", temp);
> + return -EINVAL;
> + }
> +
> + thresh = 0;
> + temp_cfg = temp_map[thresh];
> + for (i = THRESH_MAX; i >= THRESH_MIN; i--) {
> + if (temp >= temp_map[i]) {
> + thresh = i;
> + temp_cfg = temp_map[i];
> + break;
> + }
> + }
> +
> + if (temp_cfg == chip->temp_dac_map[trip])
> + return 0;
> +
> + ret = qpnp_tm_read(chip, addr, ®);
> + if (ret < 0) {
> + dev_err(chip->dev, "LITE_TEMP_CFG read failed, ret=%d\n", ret);
> + return ret;
> + }
> +
> + reg &= ~LITE_TEMP_CFG_THRESHOLD_MASK;
> + reg |= FIELD_PREP(LITE_TEMP_CFG_THRESHOLD_MASK, thresh);
> +
> + ret = qpnp_tm_write(chip, addr, reg);
> + if (ret < 0) {
> + dev_err(chip->dev, "LITE_TEMP_CFG write failed, ret=%d\n", ret);
> + return ret;
> + }
> +
> + chip->temp_dac_map[trip] = temp_cfg;
> +
> + return 0;
> +}
> +
> static int qpnp_tm_update_critical_trip_temp(struct qpnp_tm_chip *chip,
> int temp)
> {
> @@ -388,6 +491,24 @@ static const struct thermal_zone_device_ops qpnp_tm_sensor_temp_dac_ops = {
> .set_trip_temp = qpnp_tm_set_temp_dac_trip_temp,
> };
>
> +static int qpnp_tm_set_temp_lite_trip_temp(struct thermal_zone_device *tz,
> + int trip, int temp)
> +{
> + struct qpnp_tm_chip *chip = tz->devdata;
> + int ret;
> +
> + mutex_lock(&chip->lock);
> + ret = qpnp_tm_set_temp_lite_thresh(chip, trip, temp);
> + mutex_unlock(&chip->lock);
> +
> + return ret;
> +}
> +
> +static const struct thermal_zone_device_ops qpnp_tm_sensor_temp_lite_ops = {
> + .get_temp = qpnp_tm_get_temp,
> + .set_trip_temp = qpnp_tm_set_temp_lite_trip_temp,
> +};
> +
> static irqreturn_t qpnp_tm_isr(int irq, void *data)
> {
> struct qpnp_tm_chip *chip = data;
> @@ -474,6 +595,71 @@ static int qpnp_tm_temp_dac_init(struct qpnp_tm_chip *chip)
> return 0;
> }
>
> +/* Configure TEMP_LITE registers based on DT thermal_zone trips */
> +static int qpnp_tm_temp_lite_update_trip_temps(struct qpnp_tm_chip *chip)
> +{
> + const struct thermal_trip *trips;
> + int ret, ntrips, i;
> +
> + ntrips = of_thermal_get_ntrips(chip->tz_dev);
> + /* Keep hardware defaults if no DT trips are defined. */
> + if (ntrips <= 0)
> + return 0;
> +
> + trips = of_thermal_get_trip_points(chip->tz_dev);
> + if (!trips)
> + return -EINVAL;
> +
> + for (i = 0; i < ntrips; i++) {
> + if (of_thermal_is_trip_valid(chip->tz_dev, i)) {
> + ret = qpnp_tm_set_temp_lite_thresh(chip, i,
> + trips[i].temperature);
> + if (ret < 0)
> + return ret;
> + }
> + }
> +
> + /* Verify that trips are strictly increasing. */
> + if (chip->temp_dac_map[2] <= chip->temp_dac_map[0]) {
> + dev_err(chip->dev, "Threshold 2=%ld <= threshold 0=%ld\n",
> + chip->temp_dac_map[2], chip->temp_dac_map[0]);
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +/* Read the hardware default TEMP_LITE stage threshold temperatures */
> +static int qpnp_tm_temp_lite_init(struct qpnp_tm_chip *chip)
> +{
> + int ret, thresh;
> + u8 reg = 0;
> +
> + /*
> + * Store the warning trip temp in temp_dac_map[0] and the shutdown trip
> + * temp in temp_dac_map[2]. The second trip point is purely in software
> + * to facilitate a controlled shutdown after the warning threshold is
> + * crossed but before the automatic hardware shutdown threshold is
> + * crossed. Thus, there is no register to read for the second trip
> + * point.
> + */
> + ret = qpnp_tm_read(chip, QPNP_TM_REG_LITE_TEMP_CFG1, ®);
> + if (ret < 0)
> + return ret;
> +
> + thresh = FIELD_GET(LITE_TEMP_CFG_THRESHOLD_MASK, reg);
> + chip->temp_dac_map[0] = temp_map_lite_warning[thresh];
> +
> + ret = qpnp_tm_read(chip, QPNP_TM_REG_LITE_TEMP_CFG2, ®);
> + if (ret < 0)
> + return ret;
> +
> + thresh = FIELD_GET(LITE_TEMP_CFG_THRESHOLD_MASK, reg);
> + chip->temp_dac_map[2] = temp_map_lite_shutdown[thresh];
> +
> + return 0;
> +}
> +
> /*
> * This function initializes the internal temp value based on only the
> * current thermal stage and threshold. Setup threshold control and
> @@ -500,13 +686,18 @@ static int qpnp_tm_init(struct qpnp_tm_chip *chip)
> goto out;
> chip->stage = ret;
>
> - stage = chip->subtype == QPNP_TM_SUBTYPE_GEN1
> - ? chip->stage : alarm_state_map[chip->stage];
> + stage = (chip->subtype == QPNP_TM_SUBTYPE_GEN1
> + || chip->subtype == QPNP_TM_SUBTYPE_LITE)
> + ? chip->stage : alarm_state_map[chip->stage];
>
> if (stage)
> chip->temp = qpnp_tm_decode_temp(chip, stage);
>
> - if (chip->has_temp_dac) {
> + if (chip->subtype == QPNP_TM_SUBTYPE_LITE) {
> + ret = qpnp_tm_temp_lite_update_trip_temps(chip);
> + if (ret < 0)
> + goto out;
> + } else if (chip->has_temp_dac) {
> ret = qpnp_tm_temp_dac_update_trip_temps(chip);
> if (ret < 0)
> goto out;
> @@ -598,7 +789,8 @@ static int qpnp_tm_probe(struct platform_device *pdev)
> chip->dig_revision = (dig_major << 8) | dig_minor;
>
> if (type != QPNP_TM_TYPE || (subtype != QPNP_TM_SUBTYPE_GEN1
> - && subtype != QPNP_TM_SUBTYPE_GEN2)) {
> + && subtype != QPNP_TM_SUBTYPE_GEN2
> + && subtype != QPNP_TM_SUBTYPE_LITE)) {
> dev_err(&pdev->dev, "invalid type 0x%02x or subtype 0x%02x\n",
> type, subtype);
> return -ENODEV;
> @@ -610,7 +802,7 @@ static int qpnp_tm_probe(struct platform_device *pdev)
> chip->has_temp_dac = true;
> else if (subtype == QPNP_TM_SUBTYPE_GEN2 && dig_major >= 1)
> chip->temp_map = &temp_map_gen2_v1;
> - else
> + else if (subtype == QPNP_TM_SUBTYPE_GEN1)
> chip->temp_map = &temp_map_gen1;
>
> if (chip->has_temp_dac) {
> @@ -620,6 +812,13 @@ static int qpnp_tm_probe(struct platform_device *pdev)
> return ret;
> }
>
> + if (chip->subtype == QPNP_TM_SUBTYPE_LITE) {
> + ops = &qpnp_tm_sensor_temp_lite_ops;
> + ret = qpnp_tm_temp_lite_init(chip);
> + if (ret < 0)
> + return ret;
> + }
> +
> /*
> * Register the sensor before initializing the hardware to be able to
> * read the trip points. get_temp() returns the default temperature
--
With best wishes
Dmitry
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