linux-kernel - [PATCH net-next 3/5] net: ipa: set up IPA interrupts earlier

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Date:   Mon, 26 Jul 2021 15:11:34 -0500
From:   Alex Elder <elder@...aro.org>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     bjorn.andersson@...aro.org, evgreen@...omium.org,
        cpratapa@...eaurora.org, subashab@...eaurora.org, elder@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 3/5] net: ipa: set up IPA interrupts earlier

Initialization of the IPA driver has several phases:
   - "init" phase can be done without any access to IPA hardware
   - "config" phase requires the IPA hardware to be clocked
   - "setup" phase requires the GSI layer to be functional

Currently, initialization for the IPA interrupt handling code occurs
in the setup phase.  It requires access to the IPA hardware but does
not need GSI, so it can be moved to the config phase instead.

Call the interrupt configuration function early in ipa_config()
rather than from ipa_setup().  Rename ipa_interrupt_setup() to be
ipa_interrupt_config(), and ipa_interrupt_teardown() to be
ipa_interupt_deconfig(), so their names properly indicate when
they get called.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/ipa_interrupt.c |  8 ++++----
 drivers/net/ipa/ipa_interrupt.h |  8 ++++----
 drivers/net/ipa/ipa_main.c      | 24 ++++++++++++++----------
 3 files changed, 22 insertions(+), 18 deletions(-)

diff --git a/drivers/net/ipa/ipa_interrupt.c b/drivers/net/ipa/ipa_interrupt.c
index c46df0b7c4e50..46a983aeebc8b 100644
--- a/drivers/net/ipa/ipa_interrupt.c
+++ b/drivers/net/ipa/ipa_interrupt.c
@@ -231,8 +231,8 @@ ipa_interrupt_remove(struct ipa_interrupt *interrupt, enum ipa_irq_id ipa_irq)
 	interrupt->handler[ipa_irq] = NULL;
 }
 
-/* Set up the IPA interrupt framework */
-struct ipa_interrupt *ipa_interrupt_setup(struct ipa *ipa)
+/* Configure the IPA interrupt framework */
+struct ipa_interrupt *ipa_interrupt_config(struct ipa *ipa)
 {
 	struct device *dev = &ipa->pdev->dev;
 	struct ipa_interrupt *interrupt;
@@ -281,8 +281,8 @@ struct ipa_interrupt *ipa_interrupt_setup(struct ipa *ipa)
 	return ERR_PTR(ret);
 }
 
-/* Tear down the IPA interrupt framework */
-void ipa_interrupt_teardown(struct ipa_interrupt *interrupt)
+/* Inverse of ipa_interrupt_config() */
+void ipa_interrupt_deconfig(struct ipa_interrupt *interrupt)
 {
 	struct device *dev = &interrupt->ipa->pdev->dev;
 	int ret;
diff --git a/drivers/net/ipa/ipa_interrupt.h b/drivers/net/ipa/ipa_interrupt.h
index d5c486a6800d9..231390cea52a2 100644
--- a/drivers/net/ipa/ipa_interrupt.h
+++ b/drivers/net/ipa/ipa_interrupt.h
@@ -86,17 +86,17 @@ void ipa_interrupt_suspend_clear_all(struct ipa_interrupt *interrupt);
 void ipa_interrupt_simulate_suspend(struct ipa_interrupt *interrupt);
 
 /**
- * ipa_interrupt_setup() - Set up the IPA interrupt framework
+ * ipa_interrupt_config() - Configure the IPA interrupt framework
  * @ipa:	IPA pointer
  *
  * Return:	Pointer to IPA SMP2P info, or a pointer-coded error
  */
-struct ipa_interrupt *ipa_interrupt_setup(struct ipa *ipa);
+struct ipa_interrupt *ipa_interrupt_config(struct ipa *ipa);
 
 /**
- * ipa_interrupt_teardown() - Tear down the IPA interrupt framework
+ * ipa_interrupt_deconfig() - Inverse of ipa_interrupt_config()
  * @interrupt:	IPA interrupt structure
  */
-void ipa_interrupt_teardown(struct ipa_interrupt *interrupt);
+void ipa_interrupt_deconfig(struct ipa_interrupt *interrupt);
 
 #endif /* _IPA_INTERRUPT_H_ */
diff --git a/drivers/net/ipa/ipa_main.c b/drivers/net/ipa/ipa_main.c
index 8768e52854d08..c26acd8b1cb91 100644
--- a/drivers/net/ipa/ipa_main.c
+++ b/drivers/net/ipa/ipa_main.c
@@ -124,11 +124,6 @@ int ipa_setup(struct ipa *ipa)
 	if (ret)
 		return ret;
 
-	ipa->interrupt = ipa_interrupt_setup(ipa);
-	if (IS_ERR(ipa->interrupt)) {
-		ret = PTR_ERR(ipa->interrupt);
-		goto err_gsi_teardown;
-	}
 	ipa_interrupt_add(ipa->interrupt, IPA_IRQ_TX_SUSPEND,
 			  ipa_suspend_handler);
 
@@ -188,8 +183,6 @@ int ipa_setup(struct ipa *ipa)
 err_uc_teardown:
 	ipa_uc_teardown(ipa);
 	ipa_interrupt_remove(ipa->interrupt, IPA_IRQ_TX_SUSPEND);
-	ipa_interrupt_teardown(ipa->interrupt);
-err_gsi_teardown:
 	gsi_teardown(&ipa->gsi);
 
 	return ret;
@@ -214,7 +207,6 @@ static void ipa_teardown(struct ipa *ipa)
 	(void)device_init_wakeup(&ipa->pdev->dev, false);
 	ipa_uc_teardown(ipa);
 	ipa_interrupt_remove(ipa->interrupt, IPA_IRQ_TX_SUSPEND);
-	ipa_interrupt_teardown(ipa->interrupt);
 	gsi_teardown(&ipa->gsi);
 }
 
@@ -475,9 +467,16 @@ static int ipa_config(struct ipa *ipa, const struct ipa_data *data)
 	if (ret)
 		goto err_hardware_deconfig;
 
-	ret = ipa_endpoint_config(ipa);
-	if (ret)
+	ipa->interrupt = ipa_interrupt_config(ipa);
+	if (IS_ERR(ipa->interrupt)) {
+		ret = PTR_ERR(ipa->interrupt);
+		ipa->interrupt = NULL;
 		goto err_mem_deconfig;
+	}
+
+	ret = ipa_endpoint_config(ipa);
+	if (ret)
+		goto err_interrupt_deconfig;
 
 	ipa_table_config(ipa);		/* No deconfig required */
 
@@ -494,6 +493,9 @@ static int ipa_config(struct ipa *ipa, const struct ipa_data *data)
 
 err_endpoint_deconfig:
 	ipa_endpoint_deconfig(ipa);
+err_interrupt_deconfig:
+	ipa_interrupt_deconfig(ipa->interrupt);
+	ipa->interrupt = NULL;
 err_mem_deconfig:
 	ipa_mem_deconfig(ipa);
 err_hardware_deconfig:
@@ -511,6 +513,8 @@ static void ipa_deconfig(struct ipa *ipa)
 {
 	ipa_modem_deconfig(ipa);
 	ipa_endpoint_deconfig(ipa);
+	ipa_interrupt_deconfig(ipa->interrupt);
+	ipa->interrupt = NULL;
 	ipa_mem_deconfig(ipa);
 	ipa_hardware_deconfig(ipa);
 	ipa_clock_put(ipa);
-- 
2.27.0