[PATCH v3 00/30] Rework the trip points creation

[PATCH v3 00/30] Rework the trip points creation

[Daniel Lezcano]

This work is the pre-requisite of handling correctly when the trip
point are crossed. For that we need to rework how the trip points are
declared and assigned to a thermal zone.

Even if it appears to be a common sense to have the trip points being
ordered, this no guarantee neither documentation telling that is the
case.

One solution could have been to create an ordered array of trips built
when registering the thermal zone by calling the different get_trip*
ops. However those ops receive a thermal zone pointer which is not
known as it is in the process of creating it.

This cyclic dependency shows we have to rework how we manage the trip
points.

Actually, all the trip points definition can be common to the backend
sensor drivers and we can factor out the thermal trip structure in all
of them.

Then, as we register the thermal trips array, they will be available
in the thermal zone structure and a core function can return the trip
given its id.

The get_trip_* ops won't be needed anymore and could be removed. The
resulting code will be another step forward to a self encapsulated
generic thermal framework.

Most of the drivers can be converted more or less easily. This series
does a first round with most of the drivers. Some remain and will be
converted but with a smaller set of changes as the conversion is a bit
more complex.

Changelog:
 v3:
   - Reorg the series to be git-bisect safe
   - Added the set_trip generic function
   - Added the get_crit_temp generic function
   - Removed more dead code in the thermal-of
   - Fixed the exynos changelog
   - Fixed the error check for the exynos drivers
   - Collected tags
 v2:
   - Added missing EXPORT_SYMBOL_GPL() for thermal_zone_get_trip()
   - Removed tab whitespace in the acerhdf driver
   - Collected tags

Cc: Raju Rangoju <rajur@chelsio.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Peter Kaestle <peter@piie.net>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Mark Gross <markgross@kernel.org>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Amit Kucheria <amitk@kernel.org>
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Nicolas Saenz Julienne <nsaenz@kernel.org>
Cc: Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Ray Jui <rjui@broadcom.com>
Cc: Scott Branden <sbranden@broadcom.com>
Cc: Support Opensource <support.opensource@diasemi.com>
Cc: Lukasz Luba <lukasz.luba@arm.com>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: NXP Linux Team <linux-imx@nxp.com>
Cc: Thara Gopinath <thara.gopinath@linaro.org>
Cc: Andy Gross <agross@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: "Niklas Söderlund" <niklas.soderlund@ragnatech.se>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Cc: Alim Akhtar <alim.akhtar@samsung.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Jonathan Hunter <jonathanh@nvidia.com>
Cc: Eduardo Valentin <edubezval@gmail.com>
Cc: Keerthy <j-keerthy@ti.com>
Cc: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Antoine Tenart <atenart@kernel.org>
Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Cc: Dmitry Osipenko <digetx@gmail.com>
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: platform-driver-x86@vger.kernel.org
Cc: linux-pm@vger.kernel.org
Cc: linux-rpi-kernel@lists.infradead.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-arm-msm@vger.kernel.org
Cc: linux-renesas-soc@vger.kernel.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-tegra@vger.kernel.org
Cc: linux-omap@vger.kernel.org

Daniel Lezcano (30):
  thermal/core: Add a generic thermal_zone_get_trip() function
  thermal/sysfs: Do not make get_trip_hyst optional
  thermal/core: Add a generic thermal_zone_set_trip() function
  thermal/core: Add a generic thermal_zone_get_crit_temp() function
  thermal/core/governors: Use thermal_zone_get_trip() instead of ops
    functions
  thermal/of: Use generic thermal_zone_get_trip() function
  thermal/of: Remove unused functions
  thermal/drivers/exynos: Use generic thermal_zone_get_trip() function
  thermal/drivers/exynos: of_thermal_get_ntrips()
  thermal/drivers/exynos: Replace of_thermal_is_trip_valid() by
    thermal_zone_get_trip()
  thermal/drivers/tegra: Use generic thermal_zone_get_trip() function
  thermal/drivers/uniphier: Use generic thermal_zone_get_trip() function
  thermal/drivers/hisi: Use generic thermal_zone_get_trip() function
  thermal/drivers/qcom: Use generic thermal_zone_get_trip() function
  thermal/drivers/armada: Use generic thermal_zone_get_trip() function
  thermal/drivers/rcar_gen3: Use the generic function to get the number
    of trips
  thermal/of: Remove of_thermal_get_ntrips()
  thermal/of: Remove of_thermal_is_trip_valid()
  thermal/of: Remove of_thermal_set_trip_hyst()
  thermal/of: Remove of_thermal_get_crit_temp()
  thermal/drivers/st: Use generic trip points
  thermal/drivers/imx: Use generic thermal_zone_get_trip() function
  thermal/drivers/rcar: Use generic thermal_zone_get_trip() function
  thermal/drivers/broadcom: Use generic thermal_zone_get_trip() function
  thermal/drivers/da9062: Use generic thermal_zone_get_trip() function
  thermal/drivers/ti: Remove unused macros ti_thermal_get_trip_value() /
    ti_thermal_trip_is_valid()
  thermal/drivers/acerhdf: Use generic thermal_zone_get_trip() function
  thermal/drivers/cxgb4: Use generic thermal_zone_get_trip() function
  thermal/intel/int340x: Replace parameter to simplify
  thermal/drivers/intel: Use generic thermal_zone_get_trip() function

 drivers/net/ethernet/chelsio/cxgb4/cxgb4.h    |   2 -
 .../ethernet/chelsio/cxgb4/cxgb4_thermal.c    |  41 +----
 drivers/platform/x86/acerhdf.c                |  73 +++-----
 drivers/thermal/armada_thermal.c              |  39 ++---
 drivers/thermal/broadcom/bcm2835_thermal.c    |   8 +-
 drivers/thermal/da9062-thermal.c              |  52 +-----
 drivers/thermal/gov_bang_bang.c               |  23 +--
 drivers/thermal/gov_fair_share.c              |  18 +-
 drivers/thermal/gov_power_allocator.c         |  51 +++---
 drivers/thermal/gov_step_wise.c               |  22 ++-
 drivers/thermal/hisi_thermal.c                |  11 +-
 drivers/thermal/imx_thermal.c                 |  72 +++-----
 .../int340x_thermal/int340x_thermal_zone.c    |  31 ++--
 .../int340x_thermal/int340x_thermal_zone.h    |   4 +-
 .../processor_thermal_device.c                |  10 +-
 drivers/thermal/intel/x86_pkg_temp_thermal.c  | 120 +++++++------
 drivers/thermal/qcom/qcom-spmi-temp-alarm.c   |  39 ++---
 drivers/thermal/rcar_gen3_thermal.c           |   2 +-
 drivers/thermal/rcar_thermal.c                |  49 +-----
 drivers/thermal/samsung/exynos_tmu.c          |  60 ++++---
 drivers/thermal/st/st_thermal.c               |  47 +-----
 drivers/thermal/tegra/soctherm.c              |  33 ++--
 drivers/thermal/tegra/tegra30-tsensor.c       |  17 +-
 drivers/thermal/thermal_core.c                | 158 +++++++++++++++---
 drivers/thermal/thermal_core.h                |  22 ---
 drivers/thermal/thermal_helpers.c             |  28 ++--
 drivers/thermal/thermal_netlink.c             |  21 +--
 drivers/thermal/thermal_of.c                  | 116 -------------
 drivers/thermal/thermal_sysfs.c               | 127 +++++---------
 drivers/thermal/ti-soc-thermal/ti-thermal.h   |  15 --
 drivers/thermal/uniphier_thermal.c            |  27 ++-
 include/linux/thermal.h                       |  10 ++
 32 files changed, 538 insertions(+), 810 deletions(-)

-- 
2.34.1

[PATCH v3 08/30] thermal/drivers/exynos: Use generic thermal_zone_get_trip() function

[Daniel Lezcano]

The thermal framework gives the possibility to register the trip
points with the thermal zone. When that is done, no get_trip_* ops are
needed and they can be removed.

Convert ops content logic into generic trip points and register them with the
thermal zone.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/thermal/samsung/exynos_tmu.c | 41 +++++++++++-----------------
 1 file changed, 16 insertions(+), 25 deletions(-)

diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
index 51874d0a284c..0e33d32a9d2e 100644
--- a/drivers/thermal/samsung/exynos_tmu.c
+++ b/drivers/thermal/samsung/exynos_tmu.c
@@ -260,16 +260,8 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
 {
 	struct exynos_tmu_data *data = platform_get_drvdata(pdev);
 	struct thermal_zone_device *tzd = data->tzd;
-	const struct thermal_trip * const trips =
-		of_thermal_get_trip_points(tzd);
 	unsigned int status;
-	int ret = 0, temp, hyst;
-
-	if (!trips) {
-		dev_err(&pdev->dev,
-			"Cannot get trip points from device tree!\n");
-		return -ENODEV;
-	}
+	int ret = 0, temp;
 
 	if (data->soc != SOC_ARCH_EXYNOS5433) /* FIXME */
 		ret = tzd->ops->get_crit_temp(tzd, &temp);
@@ -303,19 +295,16 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
 
 		/* Write temperature code for rising and falling threshold */
 		for (i = 0; i < ntrips; i++) {
-			/* Write temperature code for rising threshold */
-			ret = tzd->ops->get_trip_temp(tzd, i, &temp);
-			if (ret)
-				goto err;
-			temp /= MCELSIUS;
-			data->tmu_set_trip_temp(data, i, temp);
 
-			/* Write temperature code for falling threshold */
-			ret = tzd->ops->get_trip_hyst(tzd, i, &hyst);
+			struct thermal_trip trip;
+			
+			ret = thermal_zone_get_trip(tzd, i, &trip);
 			if (ret)
 				goto err;
-			hyst /= MCELSIUS;
-			data->tmu_set_trip_hyst(data, i, temp, hyst);
+
+			data->tmu_set_trip_temp(data, i, trip.temperature / MCELSIUS);
+			data->tmu_set_trip_hyst(data, i, trip.temperature / MCELSIUS,
+						trip.hysteresis / MCELSIUS);
 		}
 
 		data->tmu_clear_irqs(data);
@@ -360,21 +349,23 @@ static void exynos_tmu_control(struct platform_device *pdev, bool on)
 }
 
 static void exynos4210_tmu_set_trip_temp(struct exynos_tmu_data *data,
-					 int trip, u8 temp)
+					 int trip_id, u8 temp)
 {
-	const struct thermal_trip * const trips =
-		of_thermal_get_trip_points(data->tzd);
+	struct thermal_trip trip;
 	u8 ref, th_code;
 
-	ref = trips[0].temperature / MCELSIUS;
+	if (thermal_zone_get_trip(data->tzd, 0, &trip))
+		return;
 
-	if (trip == 0) {
+	ref = trip.temperature / MCELSIUS;
+	
+	if (trip_id == 0) {
 		th_code = temp_to_code(data, ref);
 		writeb(th_code, data->base + EXYNOS4210_TMU_REG_THRESHOLD_TEMP);
 	}
 
 	temp -= ref;
-	writeb(temp, data->base + EXYNOS4210_TMU_REG_TRIG_LEVEL0 + trip * 4);
+	writeb(temp, data->base + EXYNOS4210_TMU_REG_TRIG_LEVEL0 + trip_id * 4);
 }
 
 /* failing thresholds are not supported on Exynos4210 */
-- 
2.34.1

[PATCH v3 09/30] thermal/drivers/exynos: of_thermal_get_ntrips()

[Daniel Lezcano]

The thermal core framework allows to get the number of thermal trips,
use it instead of visiting the thermal core structure internals.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
---
 drivers/thermal/samsung/exynos_tmu.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
index 0e33d32a9d2e..91e6860b5ec4 100644
--- a/drivers/thermal/samsung/exynos_tmu.c
+++ b/drivers/thermal/samsung/exynos_tmu.c
@@ -260,6 +260,7 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
 {
 	struct exynos_tmu_data *data = platform_get_drvdata(pdev);
 	struct thermal_zone_device *tzd = data->tzd;
+	int num_trips = thermal_zone_get_num_trips(tzd);
 	unsigned int status;
 	int ret = 0, temp;
 
@@ -271,12 +272,12 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
 		goto out;
 	}
 
-	if (of_thermal_get_ntrips(tzd) > data->ntrip) {
+	if (num_trips > data->ntrip) {
 		dev_info(&pdev->dev,
 			 "More trip points than supported by this TMU.\n");
 		dev_info(&pdev->dev,
 			 "%d trip points should be configured in polling mode.\n",
-			 (of_thermal_get_ntrips(tzd) - data->ntrip));
+			 num_trips - data->ntrip);
 	}
 
 	mutex_lock(&data->lock);
@@ -289,7 +290,7 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
 		ret = -EBUSY;
 	} else {
 		int i, ntrips =
-			min_t(int, of_thermal_get_ntrips(tzd), data->ntrip);
+			min_t(int, num_trips, data->ntrip);
 
 		data->tmu_initialize(pdev);
 
-- 
2.34.1

[PATCH v3 10/30] thermal/drivers/exynos: Replace of_thermal_is_trip_valid() by thermal_zone_get_trip()

[Daniel Lezcano]

The thermal_zone_get_trip() does the same check as
of_thermal_is_trip_valid(). Replace the call to
of_thermal_is_trip_valid() by thermal_zone_get_trip().

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/thermal/samsung/exynos_tmu.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
index 91e6860b5ec4..5e6bb74c67f0 100644
--- a/drivers/thermal/samsung/exynos_tmu.c
+++ b/drivers/thermal/samsung/exynos_tmu.c
@@ -554,13 +554,15 @@ static void exynos4210_tmu_control(struct platform_device *pdev, bool on)
 {
 	struct exynos_tmu_data *data = platform_get_drvdata(pdev);
 	struct thermal_zone_device *tz = data->tzd;
+	struct thermal_trip trip;
 	unsigned int con, interrupt_en = 0, i;
 
 	con = get_con_reg(data, readl(data->base + EXYNOS_TMU_REG_CONTROL));
 
 	if (on) {
 		for (i = 0; i < data->ntrip; i++) {
-			if (!of_thermal_is_trip_valid(tz, i))
+
+			if (thermal_zone_get_trip(tz, i, &trip))
 				continue;
 
 			interrupt_en |=
@@ -584,13 +586,15 @@ static void exynos5433_tmu_control(struct platform_device *pdev, bool on)
 {
 	struct exynos_tmu_data *data = platform_get_drvdata(pdev);
 	struct thermal_zone_device *tz = data->tzd;
+	struct thermal_trip trip;
 	unsigned int con, interrupt_en = 0, pd_det_en, i;
 
 	con = get_con_reg(data, readl(data->base + EXYNOS_TMU_REG_CONTROL));
 
 	if (on) {
 		for (i = 0; i < data->ntrip; i++) {
-			if (!of_thermal_is_trip_valid(tz, i))
+
+			if (thermal_zone_get_trip(tz, i, &trip))
 				continue;
 
 			interrupt_en |=
@@ -615,13 +619,15 @@ static void exynos7_tmu_control(struct platform_device *pdev, bool on)
 {
 	struct exynos_tmu_data *data = platform_get_drvdata(pdev);
 	struct thermal_zone_device *tz = data->tzd;
+	struct thermal_trip trip;
 	unsigned int con, interrupt_en = 0, i;
 
 	con = get_con_reg(data, readl(data->base + EXYNOS_TMU_REG_CONTROL));
 
 	if (on) {
 		for (i = 0; i < data->ntrip; i++) {
-			if (!of_thermal_is_trip_valid(tz, i))
+
+			if (thermal_zone_get_trip(tz, i, &trip))
 				continue;
 
 			interrupt_en |=
-- 
2.34.1

Re: [PATCH v3 08/30] thermal/drivers/exynos: Use generic thermal_zone_get_trip() function

[Krzysztof Kozlowski]

On 06/09/2022 18:46, Daniel Lezcano wrote:
> The thermal framework gives the possibility to register the trip
> points with the thermal zone. When that is done, no get_trip_* ops are
> needed and they can be removed.
> 
> Convert ops content logic into generic trip points and register them with the
> thermal zone.
> 
> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>


Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>


Best regards,
Krzysztof

Re: [PATCH v3 10/30] thermal/drivers/exynos: Replace of_thermal_is_trip_valid() by thermal_zone_get_trip()

[Krzysztof Kozlowski]

On 06/09/2022 18:47, Daniel Lezcano wrote:
> The thermal_zone_get_trip() does the same check as
> of_thermal_is_trip_valid(). Replace the call to
> of_thermal_is_trip_valid() by thermal_zone_get_trip().
> 
> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
> ---
>  drivers/thermal/samsung/exynos_tmu.c | 12 +++++++++---
>  1 file changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
> index 91e6860b5ec4..5e6bb74c67f0 100644
> --- a/drivers/thermal/samsung/exynos_tmu.c
> +++ b/drivers/thermal/samsung/exynos_tmu.c
> @@ -554,13 +554,15 @@ static void exynos4210_tmu_control(struct platform_device *pdev, bool on)
>  {
>  	struct exynos_tmu_data *data = platform_get_drvdata(pdev);
>  	struct thermal_zone_device *tz = data->tzd;
> +	struct thermal_trip trip;
>  	unsigned int con, interrupt_en = 0, i;
>  
>  	con = get_con_reg(data, readl(data->base + EXYNOS_TMU_REG_CONTROL));
>  
>  	if (on) {
>  		for (i = 0; i < data->ntrip; i++) {
> -			if (!of_thermal_is_trip_valid(tz, i))
> +
> +			if (thermal_zone_get_trip(tz, i, &trip))

No need for empty line before. Ditto in other places.

Best regards,
Krzysztof