thermal/drivers/tsens: Add support for combined interrupt

Despite using tsens v2.3 IP, IPQ8074 and IPQ6018 only have one IRQ for
signaling both up/low and critical trips.

Signed-off-by: Robert Marko <robimarko@gmail.com>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220818220245.338396-2-robimarko@gmail.com
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

drivers/thermal/qcom/tsens-8960.c

@@ -269,6 +269,7 @@ static const struct tsens_ops ops_8960 = {
 static struct tsens_features tsens_8960_feat = {
 	.ver_major	= VER_0,
 	.crit_int	= 0,
+	.combo_int	= 0,
 	.adc		= 1,
 	.srot_split	= 0,
 	.max_sensors	= 11,

drivers/thermal/qcom/tsens-v0_1.c

@@ -539,6 +539,7 @@ static int calibrate_9607(struct tsens_priv *priv)
 static struct tsens_features tsens_v0_1_feat = {
 	.ver_major	= VER_0_1,
 	.crit_int	= 0,
+	.combo_int	= 0,
 	.adc		= 1,
 	.srot_split	= 1,
 	.max_sensors	= 11,

drivers/thermal/qcom/tsens-v1.c

@@ -302,6 +302,7 @@ static int calibrate_8976(struct tsens_priv *priv)
 static struct tsens_features tsens_v1_feat = {
 	.ver_major	= VER_1_X,
 	.crit_int	= 0,
+	.combo_int	= 0,
 	.adc		= 1,
 	.srot_split	= 1,
 	.max_sensors	= 11,

drivers/thermal/qcom/tsens-v2.c

@@ -31,6 +31,7 @@
 static struct tsens_features tsens_v2_feat = {
 	.ver_major	= VER_2_X,
 	.crit_int	= 1,
+	.combo_int	= 0,
 	.adc		= 0,
 	.srot_split	= 1,
 	.max_sensors	= 16,

drivers/thermal/qcom/tsens.c

@@ -532,6 +532,27 @@ static irqreturn_t tsens_irq_thread(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
+/**
+ * tsens_combined_irq_thread() - Threaded interrupt handler for combined interrupts
+ * @irq: irq number
+ * @data: tsens controller private data
+ *
+ * Handle the combined interrupt as if it were 2 separate interrupts, so call the
+ * critical handler first and then the up/low one.
+ *
+ * Return: IRQ_HANDLED
+ */
+static irqreturn_t tsens_combined_irq_thread(int irq, void *data)
+{
+	irqreturn_t ret;
+
+	ret = tsens_critical_irq_thread(irq, data);
+	if (ret != IRQ_HANDLED)
+		return ret;
+
+	return tsens_irq_thread(irq, data);
+}
+
 static int tsens_set_trips(struct thermal_zone_device *tz, int low, int high)
 {
 	struct tsens_sensor *s = tz->devdata;
@@ -1071,13 +1092,18 @@ static int tsens_register(struct tsens_priv *priv)
 				   tsens_mC_to_hw(priv->sensor, 0));
 	}
 
-	ret = tsens_register_irq(priv, "uplow", tsens_irq_thread);
-	if (ret < 0)
-		return ret;
+	if (priv->feat->combo_int) {
+		ret = tsens_register_irq(priv, "combined",
+					 tsens_combined_irq_thread);
+	} else {
+		ret = tsens_register_irq(priv, "uplow", tsens_irq_thread);
+		if (ret < 0)
+			return ret;
 
-	if (priv->feat->crit_int)
-		ret = tsens_register_irq(priv, "critical",
-					 tsens_critical_irq_thread);
+		if (priv->feat->crit_int)
+			ret = tsens_register_irq(priv, "critical",
+						 tsens_critical_irq_thread);
+	}
 
 	return ret;
 }

drivers/thermal/qcom/tsens.h

@@ -493,6 +493,7 @@ enum regfield_ids {
  * struct tsens_features - Features supported by the IP
  * @ver_major: Major number of IP version
  * @crit_int: does the IP support critical interrupts?
+ * @combo_int: does the IP use one IRQ for up, low and critical thresholds?
  * @adc:      do the sensors only output adc code (instead of temperature)?
  * @srot_split: does the IP neatly splits the register space into SROT and TM,
  *              with SROT only being available to secure boot firmware?
@@ -502,6 +503,7 @@ enum regfield_ids {
 struct tsens_features {
 	unsigned int ver_major;
 	unsigned int crit_int:1;
+	unsigned int combo_int:1;
 	unsigned int adc:1;
 	unsigned int srot_split:1;
 	unsigned int has_watchdog:1;