net: ipa: only enable the SUSPEND IPA interrupt when needed

Only enable the SUSPEND IPA interrupt type when at least one
endpoint has that interrupt enabled.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ipa/ipa_interrupt.c

@@ -196,6 +196,7 @@ static void ipa_interrupt_suspend_control(struct ipa_interrupt *interrupt,
 	u32 mask = BIT(endpoint_id % 32);
 	u32 unit = endpoint_id / 32;
 	const struct reg *reg;
+	unsigned long weight;
 	u32 offset;
 	u32 val;
 
@@ -205,6 +206,10 @@ static void ipa_interrupt_suspend_control(struct ipa_interrupt *interrupt,
 	if (ipa->version == IPA_VERSION_3_0)
 		return;
 
+	weight = bitmap_weight(interrupt->suspend_enabled, ipa->endpoint_count);
+	if (weight == 1 && !enable)
+		ipa_interrupt_disable(ipa, IPA_IRQ_TX_SUSPEND);
+
 	reg = ipa_reg(ipa, IRQ_SUSPEND_EN);
 	offset = reg_n_offset(reg, unit);
 	val = ioread32(ipa->reg_virt + offset);
@@ -216,6 +221,9 @@ static void ipa_interrupt_suspend_control(struct ipa_interrupt *interrupt,
 	__change_bit(endpoint_id, interrupt->suspend_enabled);
 
 	iowrite32(val, ipa->reg_virt + offset);
+
+	if (!weight && enable)
+		ipa_interrupt_enable(ipa, IPA_IRQ_TX_SUSPEND);
 }
 
 /* Enable TX_SUSPEND for an endpoint */

drivers/net/ipa/ipa_power.c

@@ -234,21 +234,12 @@ void ipa_power_retention(struct ipa *ipa, bool enable)
 
 int ipa_power_setup(struct ipa *ipa)
 {
-	int ret;
-
-	ipa_interrupt_enable(ipa, IPA_IRQ_TX_SUSPEND);
-
-	ret = device_init_wakeup(ipa->dev, true);
-	if (ret)
-		ipa_interrupt_disable(ipa, IPA_IRQ_TX_SUSPEND);
-
-	return ret;
+	return device_init_wakeup(ipa->dev, true);
 }
 
 void ipa_power_teardown(struct ipa *ipa)
 {
 	(void)device_init_wakeup(ipa->dev, false);
-	ipa_interrupt_disable(ipa, IPA_IRQ_TX_SUSPEND);
 }
 
 /* Initialize IPA power management */