linux-kernel - Re: [RESEND PATCH v3 1/3] thermal: qcom-spmi-temp-alarm: enable stage 2 shutdown when required

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Date:   Tue, 21 Mar 2023 02:57:53 +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 1/3] thermal: qcom-spmi-temp-alarm: enable stage
 2 shutdown when required

On 25/01/2023 01:46, David Collins wrote:
> Certain TEMP_ALARM GEN2 PMIC peripherals need over-temperature
> stage 2 automatic PMIC partial shutdown to be enabled in order to
> 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 <quic_collinsd@...cinc.com>
> ---
>   drivers/thermal/qcom/qcom-spmi-temp-alarm.c | 32 +++++++++++++++++++--
>   1 file changed, 30 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/thermal/qcom/qcom-spmi-temp-alarm.c b/drivers/thermal/qcom/qcom-spmi-temp-alarm.c
> index ad84978109e6..e2e52703ac4d 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) 2022, Qualcomm Innovation Center, Inc. All rights reserved.
>    */
>   
>   #include <linux/bitops.h>
> @@ -18,6 +19,7 @@
>   #include "../thermal_core.h"
>   #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
> @@ -73,6 +75,7 @@ struct qpnp_tm_chip {
>   	struct device			*dev;
>   	struct thermal_zone_device	*tz_dev;
>   	unsigned int			subtype;
> +	unsigned int			dig_revision;
>   	long				temp;
>   	unsigned int			thresh;
>   	unsigned int			stage;
> @@ -224,6 +227,7 @@ static int qpnp_tm_update_critical_trip_temp(struct qpnp_tm_chip *chip,
>   	long stage2_threshold_min = (*chip->temp_map)[THRESH_MIN][1];
>   	long stage2_threshold_max = (*chip->temp_map)[THRESH_MAX][1];
>   	bool disable_s2_shutdown = false;
> +	bool require_s2_shutdown = false;
>   	u8 reg;
>   
>   	WARN_ON(!mutex_is_locked(&chip->lock));
> @@ -256,9 +260,25 @@ static int qpnp_tm_update_critical_trip_temp(struct qpnp_tm_chip *chip,
>   				 temp, stage2_threshold_max, stage2_threshold_max);
>   	}
>   
> +	if (chip->subtype == QPNP_TM_SUBTYPE_GEN2) {
> +		/*
> +		 * Check if stage 2 automatic partial shutdown must remain
> +		 * enabled to avoid potential repeated faults upon reaching
> +		 * over-temperature stage 3.
> +		 */
> +		switch (chip->dig_revision) {
> +		case 0x0001:
> +		case 0x0002:
> +		case 0x0100:
> +		case 0x0101:
> +			require_s2_shutdown = true;
> +			break;
> +		}
> +	}

Please move this switch to _probe and set chip->require_s2_shutdown instead.

> +
>   skip:
>   	reg |= chip->thresh;
> -	if (disable_s2_shutdown)
> +	if (disable_s2_shutdown && !require_s2_shutdown)
>   		reg |= SHUTDOWN_CTRL1_OVERRIDE_S2;
>   
>   	return qpnp_tm_write(chip, QPNP_TM_REG_SHUTDOWN_CTRL1, reg);
> @@ -373,7 +393,7 @@ static int qpnp_tm_probe(struct platform_device *pdev)
>   {
>   	struct qpnp_tm_chip *chip;
>   	struct device_node *node;
> -	u8 type, subtype, dig_major;
> +	u8 type, subtype, dig_major, dig_minor;
>   	u32 res;
>   	int ret, irq;
>   
> @@ -429,6 +449,14 @@ static int qpnp_tm_probe(struct platform_device *pdev)
>   		return ret;
>   	}
>   
> +	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;
> +	}
> +
> +	chip->dig_revision = (dig_major << 8) | dig_minor;
> +
>   	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",

-- 
With best wishes
Dmitry