linux-kernel - [PATCH net-next 2/8] net: ipa: only enable the SUSPEND IPA interrupt when needed

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Date: Thu, 18 Apr 2024 15:47:23 -0500
From: Alex Elder <elder@...aro.org>
To: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com
Cc: mka@...omium.org,
	andersson@...nel.org,
	quic_cpratapa@...cinc.com,
	quic_avuyyuru@...cinc.com,
	quic_jponduru@...cinc.com,
	quic_subashab@...cinc.com,
	elder@...nel.org,
	netdev@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH net-next 2/8] 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@...aro.org>
---
 drivers/net/ipa/ipa_interrupt.c |  8 ++++++++
 drivers/net/ipa/ipa_power.c     | 11 +----------
 2 files changed, 9 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ipa/ipa_interrupt.c b/drivers/net/ipa/ipa_interrupt.c
index 0e8d4e43275ea..e198712d46ebb 100644
--- a/drivers/net/ipa/ipa_interrupt.c
+++ b/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 */
diff --git a/drivers/net/ipa/ipa_power.c b/drivers/net/ipa/ipa_power.c
index 41ca7ef5e20fc..bdbcf965d5a30 100644
--- a/drivers/net/ipa/ipa_power.c
+++ b/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 */
-- 
2.40.1