linux-kernel - Re: [PATCH v4 1/5] thermal: qcom-spmi-temp-alarm: enable stage 2 shutdown when required

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Message-ID: <895a0004-04df-4b7e-9855-bc0033ca650b@linaro.org>
Date: Thu, 29 May 2025 11:34:27 +0100
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Anjelique Melendez <anjelique.melendez@....qualcomm.com>,
 amitk@...nel.org, thara.gopinath@...il.com, rafael@...nel.org,
 daniel.lezcano@...aro.org
Cc: rui.zhang@...el.com, lukasz.luba@....com, david.collins@....qualcomm.com,
 srinivas.kandagatla@...aro.org, stefan.schmidt@...aro.org,
 quic_tsoni@...cinc.com, linux-arm-msm@...r.kernel.org,
 linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
 dmitry.baryshkov@...aro.org, dmitry.baryshkov@....qualcomm.com
Subject: Re: [PATCH v4 1/5] thermal: qcom-spmi-temp-alarm: enable stage 2
 shutdown when required

On 29/05/2025 00:50, Anjelique Melendez wrote:
> From: David Collins <david.collins@....qualcomm.com>
> 
> Certain TEMP_ALARM GEN2 PMIC peripherals need over-temperature
> stage 2 automatic PMIC partial shutdown to be enabled in order to

stage 2 should be hyphenated to stage-2

> avoid repeated faults in the event of reaching over-temperature
> stage 3.  Modify the stage 2 shutdown control logic to ensure that
> stage 2 shutdown is enabled on all affected PMICs.  Read the
> digital major and minor revision registers to identify these
> PMICs.
> 
> Signed-off-by: David Collins <david.collins@....qualcomm.com>
> Signed-off-by: Anjelique Melendez <anjelique.melendez@....qualcomm.com>
> ---
>   drivers/thermal/qcom/qcom-spmi-temp-alarm.c | 32 +++++++++++++++++++--
>   1 file changed, 29 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/thermal/qcom/qcom-spmi-temp-alarm.c b/drivers/thermal/qcom/qcom-spmi-temp-alarm.c
> index a81e7d6e865f..47248a843591 100644
> --- a/drivers/thermal/qcom/qcom-spmi-temp-alarm.c
> +++ b/drivers/thermal/qcom/qcom-spmi-temp-alarm.c
> @@ -1,6 +1,7 @@
>   // SPDX-License-Identifier: GPL-2.0-only
>   /*
>    * Copyright (c) 2011-2015, 2017, 2020, The Linux Foundation. All rights reserved.
> + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.

Should have the year in it.

grep -r Copyright * | grep Qualcomm

>    */
> 
>   #include <linux/bitops.h>
> @@ -16,6 +17,7 @@
> 
>   #include "../thermal_hwmon.h"
> 
> +#define QPNP_TM_REG_DIG_MINOR		0x00
>   #define QPNP_TM_REG_DIG_MAJOR		0x01
>   #define QPNP_TM_REG_TYPE		0x04
>   #define QPNP_TM_REG_SUBTYPE		0x05
> @@ -78,6 +80,7 @@ struct qpnp_tm_chip {
>   	/* protects .thresh, .stage and chip registers */
>   	struct mutex			lock;
>   	bool				initialized;
> +	bool				require_s2_shutdown;
> 
>   	struct iio_channel		*adc;
>   	const long			(*temp_map)[THRESH_COUNT][STAGE_COUNT];
> @@ -255,7 +258,7 @@ static int qpnp_tm_update_critical_trip_temp(struct qpnp_tm_chip *chip,
> 
>   skip:
>   	reg |= chip->thresh;
> -	if (disable_s2_shutdown)
> +	if (disable_s2_shutdown && !chip->require_s2_shutdown)
>   		reg |= SHUTDOWN_CTRL1_OVERRIDE_S2;
> 
>   	return qpnp_tm_write(chip, QPNP_TM_REG_SHUTDOWN_CTRL1, reg);
> @@ -350,8 +353,8 @@ static int qpnp_tm_probe(struct platform_device *pdev)
>   {
>   	struct qpnp_tm_chip *chip;
>   	struct device_node *node;
> -	u8 type, subtype, dig_major;
> -	u32 res;
> +	u8 type, subtype, dig_major, dig_minor;
> +	u32 res, dig_revision;
>   	int ret, irq;
> 
>   	node = pdev->dev.of_node;
> @@ -402,6 +405,12 @@ static int qpnp_tm_probe(struct platform_device *pdev)
>   		return dev_err_probe(&pdev->dev, ret,
>   				     "could not read dig_major\n");
> 
> +	ret = qpnp_tm_read(chip, QPNP_TM_REG_DIG_MINOR, &dig_minor);
> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "could not read dig_minor\n");
> +		return ret;
> +	}
> +
>   	if (type != QPNP_TM_TYPE || (subtype != QPNP_TM_SUBTYPE_GEN1
>   				     && subtype != QPNP_TM_SUBTYPE_GEN2)) {
>   		dev_err(&pdev->dev, "invalid type 0x%02x or subtype 0x%02x\n",
> @@ -415,6 +424,23 @@ static int qpnp_tm_probe(struct platform_device *pdev)
>   	else
>   		chip->temp_map = &temp_map_gen1;
> 
> +	if (chip->subtype == QPNP_TM_SUBTYPE_GEN2) {
> +		dig_revision = (dig_major << 8) | dig_minor;
> +		/*
> +		 * Check if stage 2 automatic partial shutdown must remain
> +		 * enabled to avoid potential repeated faults upon reaching
> +		 * over-temperature stage 3.
> +		 */
> +		switch (dig_revision) {
> +		case 0x0001:
> +		case 0x0002:
> +		case 0x0100:
> +		case 0x0101:
> +			chip->require_s2_shutdown = true;
> +			break;
> +		}
> +	}
> +
>   	/*
>   	 * Register the sensor before initializing the hardware to be able to
>   	 * read the trip points. get_temp() returns the default temperature
> --
> 2.34.1
> 
> 
---
bod