Add hw overheat IRQ support to Marvell thermal driver

The IP can manage to trigger interrupts on overheat situation from all the sensors.

However, the interrupt source changes along with the last selected source (ie. the last read sensor), which is an inconsistent behavior. Avoid possible glitches by always selecting back only one channel which will then be referenced as the "overheat_sensor" (arbitrarily: the first in the DT which has a critical trip point filled in).

It is possible that the scan of all thermal zone nodes did not bring a critical trip point from which the overheat interrupt could be configured. In this case just complain but do not fail the probe.

Also disable sensor switch during overheat situations because changing the channel while the system is too hot could clear the overheat state by changing the source while the temperature is still very high.

Even if the overheat state is not declared, overheat interrupt must be cleared by reading the DFX interrupt cause _after_ the temperature has fallen down to the low threshold, otherwise future possible interrupts would not be served. A work polls the corresponding register until the overheat flag gets cleared in this case.

Suggested-by David Sniatkiwicz <[email protected]>

Signed-off-by Miquel Raynal <[email protected]>

---
 drivers/thermal/armada_thermal.c | 270 ++++++++++++++++++++++++++++++-
 1 file changed, 269 insertions(+), 1 deletion(-)

drivers/thermal/armada_thermal.c +56 -0

index 92f67d40f2e9..55cfaee0da77 100644
@@ -26,6 +26,11 @@
 #include <linux/iopoll.h>
 #include <linux/mfd/syscon.h>
 #include <linux/regmap.h>
+#include <linux/interrupt.h>
+
+#include "thermal_core.h"
+
+#define TO_MCELSIUS(c)			((c) * 1000)
 
 /* Thermal Manager Control and Status Register */
 #define PMU_TDC0_SW_RST_MASK		(0x1 << 1)

@@ -61,9 +66,13 @@
 #define CONTROL1_TSEN_AVG_MASK		0x7
 #define CONTROL1_EXT_TSEN_SW_RESET	BIT(7)
 #define CONTROL1_EXT_TSEN_HW_RESETn	BIT(8)
+#define CONTROL1_TSEN_INT_EN		BIT(25)
+#define CONTROL1_TSEN_SELECT_OFF	21
+#define CONTROL1_TSEN_SELECT_MASK	0x3
 
 #define STATUS_POLL_PERIOD_US		1000
 #define STATUS_POLL_TIMEOUT_US		100000
+#define OVERHEAT_INT_POLL_DELAY_MS	1000
 
 struct armada_thermal_data;
 

@@ -75,7 +84,11 @@ struct armada_thermal_priv {
 	/* serialize temperature reads/updates */
 	struct mutex update_lock;
 	struct armada_thermal_data *data;
+	struct thermal_zone_device *overheat_sensor;
+	int interrupt_source;
 	int current_channel;
+	long current_threshold;
+	long current_hysteresis;
 };
 
 struct armada_thermal_data {

@@ -93,12 +106,20 @@ struct armada_thermal_data {
 	/* Register shift and mask to access the sensor temperature */
 	unsigned int temp_shift;
 	unsigned int temp_mask;
+	unsigned int thresh_shift;
+	unsigned int hyst_shift;
+	unsigned int hyst_mask;
 	u32 is_valid_bit;
 
 	/* Syscon access */
 	unsigned int syscon_control0_off;
 	unsigned int syscon_control1_off;
 	unsigned int syscon_status_off;
+	unsigned int dfx_irq_cause_off;
+	unsigned int dfx_irq_mask_off;
+	unsigned int dfx_overheat_irq;
+	unsigned int dfx_server_irq_mask_off;
+	unsigned int dfx_server_irq_en;
 
 	/* One sensor is in the thermal IC, the others are in the CPUs if any */
 	unsigned int cpu_nr;

@@ -272,6 +293,41 @@ static bool armada_is_valid(struct armada_thermal_priv *priv)
 	return reg & priv->data->is_valid_bit;
 }
 
+static void armada_enable_overheat_interrupt(struct armada_thermal_priv *priv)
+{
+	struct armada_thermal_data *data = priv->data;
+	u32 reg;
+
+	/* Clear DFX temperature IRQ cause */
+	regmap_read(priv->syscon, data->dfx_irq_cause_off, &reg);
+
+	/* Enable DFX Temperature IRQ */
+	regmap_read(priv->syscon, data->dfx_irq_mask_off, &reg);
+	reg |= data->dfx_overheat_irq;
+	regmap_write(priv->syscon, data->dfx_irq_mask_off, reg);
+
+	/* Enable DFX server IRQ */
+	regmap_read(priv->syscon, data->dfx_server_irq_mask_off, &reg);
+	reg |= data->dfx_server_irq_en;
+	regmap_write(priv->syscon, data->dfx_server_irq_mask_off, reg);
+
+	/* Enable overheat interrupt */
+	regmap_read(priv->syscon, data->syscon_control1_off, &reg);
+	reg |= CONTROL1_TSEN_INT_EN;
+	regmap_write(priv->syscon, data->syscon_control1_off, reg);
+}
+
+static void __maybe_unused
+armada_disable_overheat_interrupt(struct armada_thermal_priv *priv)
+{
+	struct armada_thermal_data *data = priv->data;
+	u32 reg;
+
+	regmap_read(priv->syscon, data->syscon_control1_off, &reg);
+	reg &= ~CONTROL1_TSEN_INT_EN;
+	regmap_write(priv->syscon, data->syscon_control1_off, reg);
+}
+
 /* There is currently no board with more than one sensor per channel */
 static int armada_select_channel(struct armada_thermal_priv *priv, int channel)
 {

@@ -388,6 +444,16 @@ static int armada_get_temp(void *_sensor, int *temp)
 
 	/* Do the actual reading */
 	ret = armada_read_sensor(priv, temp);

drivers/thermal/armada_thermal.c +16 -0

 unlock_mutex:
 	mutex_unlock(&priv->update_lock);

@@ -399,6 +465,121 @@ static struct thermal_zone_of_device_ops of_ops = {
 	.get_temp = armada_get_temp,
 };
 
+static unsigned int armada_mc_to_reg_temp(struct armada_thermal_data *data,
+					  unsigned int temp_mc)
+{
+	s64 b = data->coef_b;
+	s64 m = data->coef_m;
+	s64 div = data->coef_div;
+	unsigned int sample;
+
+	if (data->inverted)
+		sample = div_s64(((temp_mc * div) + b), m);
+	else
+		sample = div_s64((b - (temp_mc * div)), m);
+
+	return sample & data->temp_mask;
+}
+

drivers/thermal/armada_thermal.c +45 -0

+	int i;
+
+	/*
+	 * We will always take the smallest possible hysteresis to avoid risking
+	 * the hardware integrity by enlarging the threshold by +8?C in the
+	 * worst case.
+	 */
+	for (i = ARRAY_SIZE(hyst_levels_mc) - 1; i > 0; i--)
+		if (hyst_mc >= hyst_levels_mc[i])
+			break;
+
+	return i & data->hyst_mask;
+}
+
+static void armada_set_overheat_thresholds(struct armada_thermal_priv *priv,
+					   int thresh_mc, int hyst_mc)
+{
+	struct armada_thermal_data *data = priv->data;
+	unsigned int threshold = armada_mc_to_reg_temp(data, thresh_mc);
+	unsigned int hysteresis = armada_mc_to_reg_hyst(data, hyst_mc);
+	u32 ctrl1;
+
+	regmap_read(priv->syscon, data->syscon_control1_off, &ctrl1);
+
+	/* Set Threshold */
+	if (thresh_mc >= 0) {
+		ctrl1 &= ~(data->temp_mask << data->thresh_shift);
+		ctrl1 |= threshold << data->thresh_shift;
+		priv->current_threshold = thresh_mc;
+	}
+
+	/* Set Hysteresis */
+	if (hyst_mc >= 0) {
+		ctrl1 &= ~(data->hyst_mask << data->hyst_shift);
+		ctrl1 |= hysteresis << data->hyst_shift;
+		priv->current_hysteresis = hyst_mc;
+	}
+
+	regmap_write(priv->syscon, data->syscon_control1_off, ctrl1);
+}
+
+static irqreturn_t armada_overheat_isr(int irq, void *blob)
+{
+	/*
+	 * Disable the IRQ and continue in thread context (thermal core

drivers/thermal/armada_thermal.c +11 -0

+	int low_threshold = priv->current_threshold - priv->current_hysteresis;
+	int temperature;
+	u32 dummy;
+	int ret;
+
+	/* Notify the core in thread context */
+	thermal_zone_device_update(priv->overheat_sensor,
+				   THERMAL_EVENT_UNSPECIFIED);
+
+	/*
+	 * The overheat interrupt must be cleared by reading the DFX interrupt

drivers/thermal/armada_thermal.c +29 -0

+	} while (temperature >= low_threshold);
+
+	regmap_read(priv->syscon, priv->data->dfx_irq_cause_off, &dummy);
+
+	/* Notify the thermal core that the temperature is acceptable again */
+	thermal_zone_device_update(priv->overheat_sensor,
+				   THERMAL_EVENT_UNSPECIFIED);
+
+	enable_irq(irq);
+
+	return IRQ_HANDLED;
+}
+
 static const struct armada_thermal_data armadaxp_data = {
 	.init = armadaxp_init,
 	.temp_shift = 10,

@@ -454,6 +635,9 @@ static const struct armada_thermal_data armada_ap806_data = {
 	.is_valid_bit = BIT(16),
 	.temp_shift = 0,
 	.temp_mask = 0x3ff,
+	.thresh_shift = 3,
+	.hyst_shift = 19,
+	.hyst_mask = 0x3,
 	.coef_b = -150000LL,
 	.coef_m = 423ULL,
 	.coef_div = 1,

@@ -462,6 +646,11 @@ static const struct armada_thermal_data armada_ap806_data = {
 	.syscon_control0_off = 0x84,
 	.syscon_control1_off = 0x88,
 	.syscon_status_off = 0x8C,
+	.dfx_irq_cause_off = 0x108,
+	.dfx_irq_mask_off = 0x10C,
+	.dfx_overheat_irq = BIT(22),
+	.dfx_server_irq_mask_off = 0x104,
+	.dfx_server_irq_en = BIT(1),
 	.cpu_nr = 4,
 };
 

@@ -470,6 +659,9 @@ static const struct armada_thermal_data armada_cp110_data = {
 	.is_valid_bit = BIT(10),
 	.temp_shift = 0,
 	.temp_mask = 0x3ff,
+	.thresh_shift = 16,
+	.hyst_shift = 26,
+	.hyst_mask = 0x3,
 	.coef_b = 1172499100ULL,
 	.coef_m = 2000096ULL,
 	.coef_div = 4201,

@@ -477,6 +669,11 @@ static const struct armada_thermal_data armada_cp110_data = {
 	.syscon_control0_off = 0x70,
 	.syscon_control1_off = 0x74,
 	.syscon_status_off = 0x78,
+	.dfx_irq_cause_off = 0x108,
+	.dfx_irq_mask_off = 0x10C,
+	.dfx_overheat_irq = BIT(20),
+	.dfx_server_irq_mask_off = 0x104,
+	.dfx_server_irq_en = BIT(1),
 };
 
 static const struct of_device_id armada_thermal_id_table[] = {

drivers/thermal/armada_thermal.c +37 -1

+ * switch during overheat situations.
+ */
+static int armada_configure_overheat_int(struct armada_thermal_priv *priv,
+					 struct thermal_zone_device *tz,
+					 int sensor_id)
+{
+	/* Retrieve the critical trip point to enable the overheat interrupt */
+	const struct thermal_trip *trips = of_thermal_get_trip_points(tz);
+	int ret;
+	int i;
+
+	if (!trips)
+		return -EINVAL;
+
+	for (i = 0; i < of_thermal_get_ntrips(tz); i++)
+		if (trips[i].type == THERMAL_TRIP_CRITICAL)
+			break;
+
+	if (i == of_thermal_get_ntrips(tz))
+		return -EINVAL;
+
+	ret = armada_select_channel(priv, sensor_id);
+	if (ret)
+		return ret;
+
+	armada_set_overheat_thresholds(priv,
+				       trips[i].temperature,
+				       trips[i].hysteresis);
+	priv->overheat_sensor = tz;
+	priv->interrupt_source = sensor_id;
+
+	armada_enable_overheat_interrupt(priv);
+
+	return 0;
+}
+
 static int armada_thermal_probe(struct platform_device *pdev)
 {
 	struct thermal_zone_device *tz;

@@ -599,7 +838,7 @@ static int armada_thermal_probe(struct platform_device *pdev)
 	struct armada_drvdata *drvdata;
 	const struct of_device_id *match;
 	struct armada_thermal_priv *priv;
-	int sensor_id;
+	int sensor_id, irq;
 	int ret;
 
 	match = of_match_device(armada_thermal_id_table, &pdev->dev);

drivers/thermal/armada_thermal.c +11 -0

+		ret = devm_request_threaded_irq(&pdev->dev, irq,
+						armada_overheat_isr,
+						armada_overheat_isr_thread,
+						0, NULL, priv);
+		if (ret) {
+			dev_err(&pdev->dev, "Cannot request threaded IRQ %d\n",
+				irq);
+			return ret;
+		}
+	}
+
 	/*
 	 * There is one channel for the IC and one per CPU (if any), each
 	 * channel has one sensor.

Quoted 136 lines · Miquel Raynal

The IP can manage to trigger interrupts on overheat situation from all the sensors.

However, the interrupt source changes along with the last selected source (ie. the last read sensor), which is an inconsistent behavior. Avoid possible glitches by always selecting back only one channel which will then be referenced as the "overheat_sensor" (arbitrarily: the first in the DT which has a critical trip point filled in).

It is possible that the scan of all thermal zone nodes did not bring a critical trip point from which the overheat interrupt could be configured. In this case just complain but do not fail the probe.

Also disable sensor switch during overheat situations because changing the channel while the system is too hot could clear the overheat state by changing the source while the temperature is still very high.

Even if the overheat state is not declared, overheat interrupt must be cleared by reading the DFX interrupt cause _after_ the temperature has fallen down to the low threshold, otherwise future possible interrupts would not be served. A work polls the corresponding register until the overheat flag gets cleared in this case.

Suggested-by David Sniatkiwicz <[email protected]>

Signed-off-by Miquel Raynal <[email protected]>

---
 drivers/thermal/armada_thermal.c | 270 ++++++++++++++++++++++++++++++-
 1 file changed, 269 insertions(+), 1 deletion(-)

drivers/thermal/armada_thermal.c +56 -0

index 92f67d40f2e9..55cfaee0da77 100644
@@ -26,6 +26,11 @@
 #include <linux/iopoll.h>
 #include <linux/mfd/syscon.h>
 #include <linux/regmap.h>
+#include <linux/interrupt.h>
+
+#include "thermal_core.h"
+
+#define TO_MCELSIUS(c)			((c) * 1000)
 
 /* Thermal Manager Control and Status Register */
 #define PMU_TDC0_SW_RST_MASK		(0x1 << 1)

@@ -61,9 +66,13 @@
 #define CONTROL1_TSEN_AVG_MASK		0x7
 #define CONTROL1_EXT_TSEN_SW_RESET	BIT(7)
 #define CONTROL1_EXT_TSEN_HW_RESETn	BIT(8)
+#define CONTROL1_TSEN_INT_EN		BIT(25)
+#define CONTROL1_TSEN_SELECT_OFF	21
+#define CONTROL1_TSEN_SELECT_MASK	0x3
 
 #define STATUS_POLL_PERIOD_US		1000
 #define STATUS_POLL_TIMEOUT_US		100000
+#define OVERHEAT_INT_POLL_DELAY_MS	1000
 
 struct armada_thermal_data;
 

@@ -75,7 +84,11 @@ struct armada_thermal_priv {
 	/* serialize temperature reads/updates */
 	struct mutex update_lock;
 	struct armada_thermal_data *data;
+	struct thermal_zone_device *overheat_sensor;
+	int interrupt_source;
 	int current_channel;
+	long current_threshold;
+	long current_hysteresis;
 };
 
 struct armada_thermal_data {

@@ -93,12 +106,20 @@ struct armada_thermal_data {
 	/* Register shift and mask to access the sensor temperature */
 	unsigned int temp_shift;
 	unsigned int temp_mask;
+	unsigned int thresh_shift;
+	unsigned int hyst_shift;
+	unsigned int hyst_mask;
 	u32 is_valid_bit;
 
 	/* Syscon access */
 	unsigned int syscon_control0_off;
 	unsigned int syscon_control1_off;
 	unsigned int syscon_status_off;
+	unsigned int dfx_irq_cause_off;
+	unsigned int dfx_irq_mask_off;
+	unsigned int dfx_overheat_irq;
+	unsigned int dfx_server_irq_mask_off;
+	unsigned int dfx_server_irq_en;
 
 	/* One sensor is in the thermal IC, the others are in the CPUs if any */
 	unsigned int cpu_nr;

@@ -272,6 +293,41 @@ static bool armada_is_valid(struct armada_thermal_priv *priv)
 	return reg & priv->data->is_valid_bit;
 }
 
+static void armada_enable_overheat_interrupt(struct armada_thermal_priv *priv)
+{
+	struct armada_thermal_data *data = priv->data;
+	u32 reg;
+
+	/* Clear DFX temperature IRQ cause */
+	regmap_read(priv->syscon, data->dfx_irq_cause_off, &reg);
+
+	/* Enable DFX Temperature IRQ */
+	regmap_read(priv->syscon, data->dfx_irq_mask_off, &reg);
+	reg |= data->dfx_overheat_irq;
+	regmap_write(priv->syscon, data->dfx_irq_mask_off, reg);
+
+	/* Enable DFX server IRQ */
+	regmap_read(priv->syscon, data->dfx_server_irq_mask_off, &reg);
+	reg |= data->dfx_server_irq_en;
+	regmap_write(priv->syscon, data->dfx_server_irq_mask_off, reg);
+
+	/* Enable overheat interrupt */
+	regmap_read(priv->syscon, data->syscon_control1_off, &reg);
+	reg |= CONTROL1_TSEN_INT_EN;
+	regmap_write(priv->syscon, data->syscon_control1_off, reg);
+}
+
+static void __maybe_unused
+armada_disable_overheat_interrupt(struct armada_thermal_priv *priv)
+{
+	struct armada_thermal_data *data = priv->data;
+	u32 reg;
+
+	regmap_read(priv->syscon, data->syscon_control1_off, &reg);
+	reg &= ~CONTROL1_TSEN_INT_EN;
+	regmap_write(priv->syscon, data->syscon_control1_off, reg);
+}
+
 /* There is currently no board with more than one sensor per channel */
 static int armada_select_channel(struct armada_thermal_priv *priv, int channel)
 {

@@ -388,6 +444,16 @@ static int armada_get_temp(void *_sensor, int *temp)
 

drivers/thermal/armada_thermal.c static int armada_get_temp(void *_sensor, int *temp) · line 456

Quoted 12 lines

drivers/thermal/armada_thermal.c +10 -0

 	/* Do the actual reading */
 	ret = armada_read_sensor(priv, temp);
+	if (ret)
+		goto unlock_mutex;
+
+	/*
+	 * Select back the interrupt source channel from which a potential
+	 * critical trip point has been set.
+	 */
+	ret = armada_select_channel(priv, priv->interrupt_source);
+	if (ret)
+		goto unlock_mutex;

Do you really need a "goto" to the immediately following line?

Quoted 28 lines

drivers/thermal/armada_thermal.c +21 -0

 unlock_mutex:
 	mutex_unlock(&priv->update_lock);

@@ -399,6 +465,121 @@ static struct thermal_zone_of_device_ops of_ops = {
 	.get_temp = armada_get_temp,
 };
 
+static unsigned int armada_mc_to_reg_temp(struct armada_thermal_data *data,
+					  unsigned int temp_mc)
+{
+	s64 b = data->coef_b;
+	s64 m = data->coef_m;
+	s64 div = data->coef_div;
+	unsigned int sample;
+
+	if (data->inverted)
+		sample = div_s64(((temp_mc * div) + b), m);
+	else
+		sample = div_s64((b - (temp_mc * div)), m);
+
+	return sample & data->temp_mask;
+}
+
+static unsigned int armada_mc_to_reg_hyst(struct armada_thermal_data *data,
+					  unsigned int hyst_mc)
+{
+	/*
+	 * The documentation states:

drivers/thermal/armada_thermal.c static struct thermal_zone_of_device_ops of_ops = { · line 493

Quoted 5 lines

drivers/thermal/armada_thermal.c +5 -0

+	 * high/low watermark = threshold +/- 0.4761 * 2^(hysteresis + 2)
+	 * which is the mathematical derivation for:
+	 * 0x0 <=> 1.9°C, 0x1 <=> 3.8°C, 0x2 <=> 7.6°C, 0x3 <=> 15.2
+	 */
+	unsigned int hyst_levels_mc[] = {1900, 3800, 7600, 15200};

Why isn't this a static array rather than something you have to push on the stack each time you execute this function?

Quoted 46 lines

drivers/thermal/armada_thermal.c +45 -0

+	int i;
+
+	/*
+	 * We will always take the smallest possible hysteresis to avoid risking
+	 * the hardware integrity by enlarging the threshold by +8°C in the
+	 * worst case.
+	 */
+	for (i = ARRAY_SIZE(hyst_levels_mc) - 1; i > 0; i--)
+		if (hyst_mc >= hyst_levels_mc[i])
+			break;
+
+	return i & data->hyst_mask;
+}
+
+static void armada_set_overheat_thresholds(struct armada_thermal_priv *priv,
+					   int thresh_mc, int hyst_mc)
+{
+	struct armada_thermal_data *data = priv->data;
+	unsigned int threshold = armada_mc_to_reg_temp(data, thresh_mc);
+	unsigned int hysteresis = armada_mc_to_reg_hyst(data, hyst_mc);
+	u32 ctrl1;
+
+	regmap_read(priv->syscon, data->syscon_control1_off, &ctrl1);
+
+	/* Set Threshold */
+	if (thresh_mc >= 0) {
+		ctrl1 &= ~(data->temp_mask << data->thresh_shift);
+		ctrl1 |= threshold << data->thresh_shift;
+		priv->current_threshold = thresh_mc;
+	}
+
+	/* Set Hysteresis */
+	if (hyst_mc >= 0) {
+		ctrl1 &= ~(data->hyst_mask << data->hyst_shift);
+		ctrl1 |= hysteresis << data->hyst_shift;
+		priv->current_hysteresis = hyst_mc;
+	}
+
+	regmap_write(priv->syscon, data->syscon_control1_off, ctrl1);
+}
+
+static irqreturn_t armada_overheat_isr(int irq, void *blob)
+{
+	/*
+	 * Disable the IRQ and continue in thread context (thermal core

drivers/thermal/armada_thermal.c static struct thermal_zone_of_device_ops of_ops = { · line 548

Quoted 10 lines

drivers/thermal/armada_thermal.c +10 -0

+	 * notification and temperature monitoring).
+	 */
+	disable_irq_nosync(irq);
+
+	return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t armada_overheat_isr_thread(int irq, void *blob)
+{
+	struct armada_thermal_priv *priv = (struct armada_thermal_priv *)blob;

Unnecessary cast.

Quoted 11 lines

drivers/thermal/armada_thermal.c +11 -0

+	int low_threshold = priv->current_threshold - priv->current_hysteresis;
+	int temperature;
+	u32 dummy;
+	int ret;
+
+	/* Notify the core in thread context */
+	thermal_zone_device_update(priv->overheat_sensor,
+				   THERMAL_EVENT_UNSPECIFIED);
+
+	/*
+	 * The overheat interrupt must be cleared by reading the DFX interrupt

drivers/thermal/armada_thermal.c static struct thermal_zone_of_device_ops of_ops = { · line 569

Quoted 10 lines

drivers/thermal/armada_thermal.c +10 -0

+	 * cause _after_ the temperature has fallen down to the low threshold.
+	 * Otherwise future interrupts might not be served.
+	 */
+	do {
+		msleep(OVERHEAT_INT_POLL_DELAY_MS);
+		mutex_lock(&priv->update_lock);
+		ret = armada_read_sensor(priv, &temperature);
+		mutex_unlock(&priv->update_lock);
+		if (ret)
+			return ret;

How will the interrupt fire again if you exit without re-enabling it? Is "ret" guaranteed to be a valid irqreturn_t?

Quoted 64 lines

drivers/thermal/armada_thermal.c +29 -0

+	} while (temperature >= low_threshold);
+
+	regmap_read(priv->syscon, priv->data->dfx_irq_cause_off, &dummy);
+
+	/* Notify the thermal core that the temperature is acceptable again */
+	thermal_zone_device_update(priv->overheat_sensor,
+				   THERMAL_EVENT_UNSPECIFIED);
+
+	enable_irq(irq);
+
+	return IRQ_HANDLED;
+}
+
 static const struct armada_thermal_data armadaxp_data = {
 	.init = armadaxp_init,
 	.temp_shift = 10,

@@ -454,6 +635,9 @@ static const struct armada_thermal_data armada_ap806_data = {
 	.is_valid_bit = BIT(16),
 	.temp_shift = 0,
 	.temp_mask = 0x3ff,
+	.thresh_shift = 3,
+	.hyst_shift = 19,
+	.hyst_mask = 0x3,
 	.coef_b = -150000LL,
 	.coef_m = 423ULL,
 	.coef_div = 1,

@@ -462,6 +646,11 @@ static const struct armada_thermal_data armada_ap806_data = {
 	.syscon_control0_off = 0x84,
 	.syscon_control1_off = 0x88,
 	.syscon_status_off = 0x8C,
+	.dfx_irq_cause_off = 0x108,
+	.dfx_irq_mask_off = 0x10C,
+	.dfx_overheat_irq = BIT(22),
+	.dfx_server_irq_mask_off = 0x104,
+	.dfx_server_irq_en = BIT(1),
 	.cpu_nr = 4,
 };
 

@@ -470,6 +659,9 @@ static const struct armada_thermal_data armada_cp110_data = {
 	.is_valid_bit = BIT(10),
 	.temp_shift = 0,
 	.temp_mask = 0x3ff,
+	.thresh_shift = 16,
+	.hyst_shift = 26,
+	.hyst_mask = 0x3,
 	.coef_b = 1172499100ULL,
 	.coef_m = 2000096ULL,
 	.coef_div = 4201,

@@ -477,6 +669,11 @@ static const struct armada_thermal_data armada_cp110_data = {
 	.syscon_control0_off = 0x70,
 	.syscon_control1_off = 0x74,
 	.syscon_status_off = 0x78,
+	.dfx_irq_cause_off = 0x108,
+	.dfx_irq_mask_off = 0x10C,
+	.dfx_overheat_irq = BIT(20),
+	.dfx_server_irq_mask_off = 0x104,
+	.dfx_server_irq_en = BIT(1),
 };
 
 static const struct of_device_id armada_thermal_id_table[] = {

@@ -592,6 +789,48 @@ static void armada_set_sane_name(struct platform_device *pdev,
 	} while (insane_char);
 }
 

drivers/thermal/armada_thermal.c static void armada_set_sane_name(struct platform_device *pdev, · line 797

Quoted 6 lines

drivers/thermal/armada_thermal.c +6 -0

+/*
+ * The IP can manage to trigger interrupts on overheat situation from all the
+ * sensors. However, the interrupt source changes along with the last selected
+ * source (ie. the last read sensor), which is an inconsistent behavior. Avoid
+ * possible glitches by always selecting back only one channel (arbitrarily: the
+ * first in the DT which has a critical trip point). We also disable sensor

The DT doesn't seem to *mandate* this. Should it? Does it also mean that you can only have a single critical point that will generate an interrupt on overheat?

Quoted 49 lines

drivers/thermal/armada_thermal.c +37 -1

+ * switch during overheat situations.
+ */
+static int armada_configure_overheat_int(struct armada_thermal_priv *priv,
+					 struct thermal_zone_device *tz,
+					 int sensor_id)
+{
+	/* Retrieve the critical trip point to enable the overheat interrupt */
+	const struct thermal_trip *trips = of_thermal_get_trip_points(tz);
+	int ret;
+	int i;
+
+	if (!trips)
+		return -EINVAL;
+
+	for (i = 0; i < of_thermal_get_ntrips(tz); i++)
+		if (trips[i].type == THERMAL_TRIP_CRITICAL)
+			break;
+
+	if (i == of_thermal_get_ntrips(tz))
+		return -EINVAL;
+
+	ret = armada_select_channel(priv, sensor_id);
+	if (ret)
+		return ret;
+
+	armada_set_overheat_thresholds(priv,
+				       trips[i].temperature,
+				       trips[i].hysteresis);
+	priv->overheat_sensor = tz;
+	priv->interrupt_source = sensor_id;
+
+	armada_enable_overheat_interrupt(priv);
+
+	return 0;
+}
+
 static int armada_thermal_probe(struct platform_device *pdev)
 {
 	struct thermal_zone_device *tz;

@@ -599,7 +838,7 @@ static int armada_thermal_probe(struct platform_device *pdev)
 	struct armada_drvdata *drvdata;
 	const struct of_device_id *match;
 	struct armada_thermal_priv *priv;
-	int sensor_id;
+	int sensor_id, irq;
 	int ret;
 
 	match = of_match_device(armada_thermal_id_table, &pdev->dev);

drivers/thermal/armada_thermal.c static int armada_thermal_probe(struct platform_device *pdev) · line 916

Quoted 9 lines

drivers/thermal/armada_thermal.c +6 -0

@@ -669,6 +908,23 @@ static int armada_thermal_probe(struct platform_device *pdev)
 	drvdata->data.priv = priv;
 	platform_set_drvdata(pdev, drvdata);
 
+	irq = platform_get_irq(pdev, 0);
+	if (irq == -EPROBE_DEFER)
+		return irq;
+
+	/* The overheat interrupt feature is not mandatory */
+	if (irq >= 0) {

0 is not a valid interrupt.

Quoted 15 lines

drivers/thermal/armada_thermal.c +11 -0

+		ret = devm_request_threaded_irq(&pdev->dev, irq,
+						armada_overheat_isr,
+						armada_overheat_isr_thread,
+						0, NULL, priv);
+		if (ret) {
+			dev_err(&pdev->dev, "Cannot request threaded IRQ %d\n",
+				irq);
+			return ret;
+		}
+	}
+
 	/*
 	 * There is one channel for the IC and one per CPU (if any), each
 	 * channel has one sensor.

drivers/thermal/armada_thermal.c static int armada_thermal_probe(struct platform_device *pdev) · line 957

Quoted 10 lines

drivers/thermal/armada_thermal.c +7 -0

@@ -692,8 +948,20 @@ static int armada_thermal_probe(struct platform_device *pdev)
 			devm_kfree(&pdev->dev, sensor);
 			continue;
 		}
+
+		/*
+		 * The first channel that has a critical trip point registered
+		 * in the DT will serve as interrupt source. Others possible
+		 * critical trip points will simply be ignored by the driver.
+		 */
+		if (irq >= 0 && !priv->overheat_sensor)

Same here.

drivers/thermal/armada_thermal.c static int armada_thermal_probe(struct platform_device *pdev) · line 967

Quoted 11 lines

drivers/thermal/armada_thermal.c +5 -0

+			armada_configure_overheat_int(priv, tz, sensor->id);
 	}
 
+	/* Just complain if no overheat interrupt was set up */
+	if (!priv->overheat_sensor)
+		dev_warn(&pdev->dev, "Overheat interrupt not available\n");
+
 	return 0;
 }
 

Thanks,

	M.

Signature · 1 line

Jazz is not dead. It just smells funny...

Quoted 137 lines · Miquel Raynal

Quoted 136 lines

The IP can manage to trigger interrupts on overheat situation from all the sensors.

However, the interrupt source changes along with the last selected source (ie. the last read sensor), which is an inconsistent behavior. Avoid possible glitches by always selecting back only one channel which will then be referenced as the "overheat_sensor" (arbitrarily: the first in the DT which has a critical trip point filled in).

It is possible that the scan of all thermal zone nodes did not bring a critical trip point from which the overheat interrupt could be configured. In this case just complain but do not fail the probe.

Also disable sensor switch during overheat situations because changing the channel while the system is too hot could clear the overheat state by changing the source while the temperature is still very high.

Even if the overheat state is not declared, overheat interrupt must be cleared by reading the DFX interrupt cause _after_ the temperature has fallen down to the low threshold, otherwise future possible interrupts would not be served. A work polls the corresponding register until the overheat flag gets cleared in this case.

Suggested-by David Sniatkiwicz <[email protected]>

Signed-off-by Miquel Raynal <[email protected]>

---
 drivers/thermal/armada_thermal.c | 270 ++++++++++++++++++++++++++++++-
 1 file changed, 269 insertions(+), 1 deletion(-)

drivers/thermal/armada_thermal.c +56 -0

index 92f67d40f2e9..55cfaee0da77 100644
@@ -26,6 +26,11 @@
 #include <linux/iopoll.h>
 #include <linux/mfd/syscon.h>
 #include <linux/regmap.h>
+#include <linux/interrupt.h>
+
+#include "thermal_core.h"
+
+#define TO_MCELSIUS(c)			((c) * 1000)
 
 /* Thermal Manager Control and Status Register */
 #define PMU_TDC0_SW_RST_MASK		(0x1 << 1)

@@ -61,9 +66,13 @@
 #define CONTROL1_TSEN_AVG_MASK		0x7
 #define CONTROL1_EXT_TSEN_SW_RESET	BIT(7)
 #define CONTROL1_EXT_TSEN_HW_RESETn	BIT(8)
+#define CONTROL1_TSEN_INT_EN		BIT(25)
+#define CONTROL1_TSEN_SELECT_OFF	21
+#define CONTROL1_TSEN_SELECT_MASK	0x3
 
 #define STATUS_POLL_PERIOD_US		1000
 #define STATUS_POLL_TIMEOUT_US		100000
+#define OVERHEAT_INT_POLL_DELAY_MS	1000
 
 struct armada_thermal_data;
 

@@ -75,7 +84,11 @@ struct armada_thermal_priv {
 	/* serialize temperature reads/updates */
 	struct mutex update_lock;
 	struct armada_thermal_data *data;
+	struct thermal_zone_device *overheat_sensor;
+	int interrupt_source;
 	int current_channel;
+	long current_threshold;
+	long current_hysteresis;
 };
 
 struct armada_thermal_data {

@@ -93,12 +106,20 @@ struct armada_thermal_data {
 	/* Register shift and mask to access the sensor temperature */
 	unsigned int temp_shift;
 	unsigned int temp_mask;
+	unsigned int thresh_shift;
+	unsigned int hyst_shift;
+	unsigned int hyst_mask;
 	u32 is_valid_bit;
 
 	/* Syscon access */
 	unsigned int syscon_control0_off;
 	unsigned int syscon_control1_off;
 	unsigned int syscon_status_off;
+	unsigned int dfx_irq_cause_off;
+	unsigned int dfx_irq_mask_off;
+	unsigned int dfx_overheat_irq;
+	unsigned int dfx_server_irq_mask_off;
+	unsigned int dfx_server_irq_en;
 
 	/* One sensor is in the thermal IC, the others are in the CPUs if any */
 	unsigned int cpu_nr;

@@ -272,6 +293,41 @@ static bool armada_is_valid(struct armada_thermal_priv *priv)
 	return reg & priv->data->is_valid_bit;
 }
 
+static void armada_enable_overheat_interrupt(struct armada_thermal_priv *priv)
+{
+	struct armada_thermal_data *data = priv->data;
+	u32 reg;
+
+	/* Clear DFX temperature IRQ cause */
+	regmap_read(priv->syscon, data->dfx_irq_cause_off, &reg);
+
+	/* Enable DFX Temperature IRQ */
+	regmap_read(priv->syscon, data->dfx_irq_mask_off, &reg);
+	reg |= data->dfx_overheat_irq;
+	regmap_write(priv->syscon, data->dfx_irq_mask_off, reg);
+
+	/* Enable DFX server IRQ */
+	regmap_read(priv->syscon, data->dfx_server_irq_mask_off, &reg);
+	reg |= data->dfx_server_irq_en;
+	regmap_write(priv->syscon, data->dfx_server_irq_mask_off, reg);
+
+	/* Enable overheat interrupt */
+	regmap_read(priv->syscon, data->syscon_control1_off, &reg);
+	reg |= CONTROL1_TSEN_INT_EN;
+	regmap_write(priv->syscon, data->syscon_control1_off, reg);
+}
+
+static void __maybe_unused
+armada_disable_overheat_interrupt(struct armada_thermal_priv *priv)
+{
+	struct armada_thermal_data *data = priv->data;
+	u32 reg;
+
+	regmap_read(priv->syscon, data->syscon_control1_off, &reg);
+	reg &= ~CONTROL1_TSEN_INT_EN;
+	regmap_write(priv->syscon, data->syscon_control1_off, reg);
+}
+
 /* There is currently no board with more than one sensor per channel */
 static int armada_select_channel(struct armada_thermal_priv *priv, int channel)
 {

@@ -388,6 +444,16 @@ static int armada_get_temp(void *_sensor, int *temp)
 

Quoted 15 lines

drivers/thermal/armada_thermal.c static int armada_get_temp(void *_sensor, int *temp) · line 456

Quoted 12 lines

drivers/thermal/armada_thermal.c +10 -0

 	/* Do the actual reading */
 	ret = armada_read_sensor(priv, temp);
+	if (ret)
+		goto unlock_mutex;
+
+	/*
+	 * Select back the interrupt source channel from which a potential
+	 * critical trip point has been set.
+	 */
+	ret = armada_select_channel(priv, priv->interrupt_source);
+	if (ret)
+		goto unlock_mutex;  

Do you really need a "goto" to the immediately following line?

Agreed, that goto can be removed..

Quoted 29 lines

Quoted 29 lines

drivers/thermal/armada_thermal.c +21 -0

 unlock_mutex:
 	mutex_unlock(&priv->update_lock);

@@ -399,6 +465,121 @@ static struct thermal_zone_of_device_ops of_ops = {
 	.get_temp = armada_get_temp,
 };
 
+static unsigned int armada_mc_to_reg_temp(struct armada_thermal_data *data,
+					  unsigned int temp_mc)
+{
+	s64 b = data->coef_b;
+	s64 m = data->coef_m;
+	s64 div = data->coef_div;
+	unsigned int sample;
+
+	if (data->inverted)
+		sample = div_s64(((temp_mc * div) + b), m);
+	else
+		sample = div_s64((b - (temp_mc * div)), m);
+
+	return sample & data->temp_mask;
+}
+
+static unsigned int armada_mc_to_reg_hyst(struct armada_thermal_data *data,
+					  unsigned int hyst_mc)
+{
+	/*
+	 * The documentation states:

Quoted 8 lines

drivers/thermal/armada_thermal.c static struct thermal_zone_of_device_ops of_ops = { · line 493

Quoted 5 lines

drivers/thermal/armada_thermal.c +5 -0

+	 * high/low watermark = threshold +/- 0.4761 * 2^(hysteresis + 2)
+	 * which is the mathematical derivation for:
+	 * 0x0 <=> 1.9°C, 0x1 <=> 3.8°C, 0x2 <=> 7.6°C, 0x3 <=> 15.2
+	 */
+	unsigned int hyst_levels_mc[] = {1900, 3800, 7600, 15200};  

Why isn't this a static array rather than something you have to push on the stack each time you execute this function?

Also, where those constants come from? Is this something the driver needs to be updated when new chips are added for instance?

Quoted 51 lines

Quoted 51 lines

drivers/thermal/armada_thermal.c +49 -0

+	int i;
+
+	/*
+	 * We will always take the smallest possible hysteresis to avoid risking
+	 * the hardware integrity by enlarging the threshold by +8°C in the
+	 * worst case.
+	 */
+	for (i = ARRAY_SIZE(hyst_levels_mc) - 1; i > 0; i--)
+		if (hyst_mc >= hyst_levels_mc[i])
+			break;
+
+	return i & data->hyst_mask;
+}
+
+static void armada_set_overheat_thresholds(struct armada_thermal_priv *priv,
+					   int thresh_mc, int hyst_mc)
+{
+	struct armada_thermal_data *data = priv->data;
+	unsigned int threshold = armada_mc_to_reg_temp(data, thresh_mc);
+	unsigned int hysteresis = armada_mc_to_reg_hyst(data, hyst_mc);
+	u32 ctrl1;
+
+	regmap_read(priv->syscon, data->syscon_control1_off, &ctrl1);
+
+	/* Set Threshold */
+	if (thresh_mc >= 0) {
+		ctrl1 &= ~(data->temp_mask << data->thresh_shift);
+		ctrl1 |= threshold << data->thresh_shift;
+		priv->current_threshold = thresh_mc;
+	}
+
+	/* Set Hysteresis */
+	if (hyst_mc >= 0) {
+		ctrl1 &= ~(data->hyst_mask << data->hyst_shift);
+		ctrl1 |= hysteresis << data->hyst_shift;
+		priv->current_hysteresis = hyst_mc;
+	}
+
+	regmap_write(priv->syscon, data->syscon_control1_off, ctrl1);
+}
+
+static irqreturn_t armada_overheat_isr(int irq, void *blob)
+{
+	/*
+	 * Disable the IRQ and continue in thread context (thermal core
+	 * notification and temperature monitoring).
+	 */
+	disable_irq_nosync(irq);
+

Quoted 8 lines

drivers/thermal/armada_thermal.c static struct thermal_zone_of_device_ops of_ops = { · line 548

Quoted 6 lines

drivers/thermal/armada_thermal.c +6 -0

+	return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t armada_overheat_isr_thread(int irq, void *blob)
+{
+	struct armada_thermal_priv *priv = (struct armada_thermal_priv *)blob;  

Unnecessary cast.

Quoted 17 lines

Quoted 17 lines

drivers/thermal/armada_thermal.c +16 -0

+	int low_threshold = priv->current_threshold - priv->current_hysteresis;
+	int temperature;
+	u32 dummy;
+	int ret;
+
+	/* Notify the core in thread context */
+	thermal_zone_device_update(priv->overheat_sensor,
+				   THERMAL_EVENT_UNSPECIFIED);
+
+	/*
+	 * The overheat interrupt must be cleared by reading the DFX interrupt
+	 * cause _after_ the temperature has fallen down to the low threshold.
+	 * Otherwise future interrupts might not be served.
+	 */
+	do {
+		msleep(OVERHEAT_INT_POLL_DELAY_MS);

Quoted 8 lines

drivers/thermal/armada_thermal.c static struct thermal_zone_of_device_ops of_ops = { · line 569

Quoted 5 lines

drivers/thermal/armada_thermal.c +5 -0

+		mutex_lock(&priv->update_lock);
+		ret = armada_read_sensor(priv, &temperature);
+		mutex_unlock(&priv->update_lock);
+		if (ret)
+			return ret;  

How will the interrupt fire again if you exit without re-enabling it? Is "ret" guaranteed to be a valid irqreturn_t?

Quoted 65 lines

Quoted 65 lines

drivers/thermal/armada_thermal.c +29 -0

+	} while (temperature >= low_threshold);
+
+	regmap_read(priv->syscon, priv->data->dfx_irq_cause_off, &dummy);
+
+	/* Notify the thermal core that the temperature is acceptable again */
+	thermal_zone_device_update(priv->overheat_sensor,
+				   THERMAL_EVENT_UNSPECIFIED);
+
+	enable_irq(irq);
+
+	return IRQ_HANDLED;
+}
+
 static const struct armada_thermal_data armadaxp_data = {
 	.init = armadaxp_init,
 	.temp_shift = 10,

@@ -454,6 +635,9 @@ static const struct armada_thermal_data armada_ap806_data = {
 	.is_valid_bit = BIT(16),
 	.temp_shift = 0,
 	.temp_mask = 0x3ff,
+	.thresh_shift = 3,
+	.hyst_shift = 19,
+	.hyst_mask = 0x3,
 	.coef_b = -150000LL,
 	.coef_m = 423ULL,
 	.coef_div = 1,

@@ -462,6 +646,11 @@ static const struct armada_thermal_data armada_ap806_data = {
 	.syscon_control0_off = 0x84,
 	.syscon_control1_off = 0x88,
 	.syscon_status_off = 0x8C,
+	.dfx_irq_cause_off = 0x108,
+	.dfx_irq_mask_off = 0x10C,
+	.dfx_overheat_irq = BIT(22),
+	.dfx_server_irq_mask_off = 0x104,
+	.dfx_server_irq_en = BIT(1),
 	.cpu_nr = 4,
 };
 

@@ -470,6 +659,9 @@ static const struct armada_thermal_data armada_cp110_data = {
 	.is_valid_bit = BIT(10),
 	.temp_shift = 0,
 	.temp_mask = 0x3ff,
+	.thresh_shift = 16,
+	.hyst_shift = 26,
+	.hyst_mask = 0x3,
 	.coef_b = 1172499100ULL,
 	.coef_m = 2000096ULL,
 	.coef_div = 4201,

@@ -477,6 +669,11 @@ static const struct armada_thermal_data armada_cp110_data = {
 	.syscon_control0_off = 0x70,
 	.syscon_control1_off = 0x74,
 	.syscon_status_off = 0x78,
+	.dfx_irq_cause_off = 0x108,
+	.dfx_irq_mask_off = 0x10C,
+	.dfx_overheat_irq = BIT(20),
+	.dfx_server_irq_mask_off = 0x104,
+	.dfx_server_irq_en = BIT(1),
 };
 
 static const struct of_device_id armada_thermal_id_table[] = {

@@ -592,6 +789,48 @@ static void armada_set_sane_name(struct platform_device *pdev,
 	} while (insane_char);
 }
 

Quoted 10 lines

drivers/thermal/armada_thermal.c static void armada_set_sane_name(struct platform_device *pdev, · line 797

Quoted 6 lines

drivers/thermal/armada_thermal.c +6 -0

+/*
+ * The IP can manage to trigger interrupts on overheat situation from all the
+ * sensors. However, the interrupt source changes along with the last selected
+ * source (ie. the last read sensor), which is an inconsistent behavior. Avoid
+ * possible glitches by always selecting back only one channel (arbitrarily: the
+ * first in the DT which has a critical trip point). We also disable sensor  

The DT doesn't seem to *mandate* this. Should it? Does it also mean that you can only have a single critical point that will generate an interrupt on overheat?

Also, keep in mind that thermal core will shutdown the system when it sees any zone with temp crossing the first critical trip.

Quoted 54 lines

Quoted 54 lines

drivers/thermal/armada_thermal.c +37 -1

+ * switch during overheat situations.
+ */
+static int armada_configure_overheat_int(struct armada_thermal_priv *priv,
+					 struct thermal_zone_device *tz,
+					 int sensor_id)
+{
+	/* Retrieve the critical trip point to enable the overheat interrupt */
+	const struct thermal_trip *trips = of_thermal_get_trip_points(tz);
+	int ret;
+	int i;
+
+	if (!trips)
+		return -EINVAL;
+
+	for (i = 0; i < of_thermal_get_ntrips(tz); i++)
+		if (trips[i].type == THERMAL_TRIP_CRITICAL)
+			break;
+
+	if (i == of_thermal_get_ntrips(tz))
+		return -EINVAL;
+
+	ret = armada_select_channel(priv, sensor_id);
+	if (ret)
+		return ret;
+
+	armada_set_overheat_thresholds(priv,
+				       trips[i].temperature,
+				       trips[i].hysteresis);
+	priv->overheat_sensor = tz;
+	priv->interrupt_source = sensor_id;
+
+	armada_enable_overheat_interrupt(priv);
+
+	return 0;
+}
+
 static int armada_thermal_probe(struct platform_device *pdev)
 {
 	struct thermal_zone_device *tz;

@@ -599,7 +838,7 @@ static int armada_thermal_probe(struct platform_device *pdev)
 	struct armada_drvdata *drvdata;
 	const struct of_device_id *match;
 	struct armada_thermal_priv *priv;
-	int sensor_id;
+	int sensor_id, irq;
 	int ret;
 
 	match = of_match_device(armada_thermal_id_table, &pdev->dev);

@@ -669,6 +908,23 @@ static int armada_thermal_probe(struct platform_device *pdev)
 	drvdata->data.priv = priv;
 	platform_set_drvdata(pdev, drvdata);
 

Quoted 8 lines

drivers/thermal/armada_thermal.c static int armada_thermal_probe(struct platform_device *pdev) · line 916

Quoted 6 lines

drivers/thermal/armada_thermal.c +6 -0

+	irq = platform_get_irq(pdev, 0);
+	if (irq == -EPROBE_DEFER)
+		return irq;
+
+	/* The overheat interrupt feature is not mandatory */
+	if (irq >= 0) {  

0 is not a valid interrupt.

Quoted 20 lines

Quoted 20 lines

drivers/thermal/armada_thermal.c +12 -0

+		ret = devm_request_threaded_irq(&pdev->dev, irq,
+						armada_overheat_isr,
+						armada_overheat_isr_thread,
+						0, NULL, priv);
+		if (ret) {
+			dev_err(&pdev->dev, "Cannot request threaded IRQ %d\n",
+				irq);
+			return ret;
+		}
+	}
+
 	/*
 	 * There is one channel for the IC and one per CPU (if any), each
 	 * channel has one sensor.

@@ -692,8 +948,20 @@ static int armada_thermal_probe(struct platform_device *pdev)
 			devm_kfree(&pdev->dev, sensor);
 			continue;
 		}
+

Quoted 8 lines

drivers/thermal/armada_thermal.c static int armada_thermal_probe(struct platform_device *pdev) · line 957

Quoted 6 lines

drivers/thermal/armada_thermal.c +6 -0

+		/*
+		 * The first channel that has a critical trip point registered
+		 * in the DT will serve as interrupt source. Others possible
+		 * critical trip points will simply be ignored by the driver.
+		 */
+		if (irq >= 0 && !priv->overheat_sensor)  

Same here.

Quoted 15 lines

drivers/thermal/armada_thermal.c static int armada_thermal_probe(struct platform_device *pdev) · line 967

Quoted 12 lines

drivers/thermal/armada_thermal.c +5 -0

+			armada_configure_overheat_int(priv, tz, sensor->id);
 	}
 
+	/* Just complain if no overheat interrupt was set up */
+	if (!priv->overheat_sensor)
+		dev_warn(&pdev->dev, "Overheat interrupt not available\n");
+
 	return 0;
 }
 

Thanks,

Quoted 3 lines

	M.

Signature · 1 line

Jazz is not dead. It just smells funny...