linux-kernel - [PATCH net-next 03/18] net: phy: microchip: implement generic .handle

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Date:   Thu, 12 Nov 2020 17:54:58 +0200
From:   Ioana Ciornei <ciorneiioana@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Ioana Ciornei <ioana.ciornei@....com>,
        Nisar Sayed <Nisar.Sayed@...rochip.com>,
        Yuiko Oshino <yuiko.oshino@...rochip.com>
Subject: [PATCH net-next 03/18] net: phy: microchip: implement generic .handle_interrupt() callback

From: Ioana Ciornei <ioana.ciornei@....com>

In an attempt to actually support shared IRQs in phylib, we now move the
responsibility of triggering the phylib state machine or just returning
IRQ_NONE, based on the IRQ status register, to the PHY driver. Having
3 different IRQ handling callbacks (.handle_interrupt(),
.did_interrupt() and .ack_interrupt() ) is confusing so let the PHY
driver implement directly an IRQ handler like any other device driver.
Make this driver follow the new convention.

Cc: Nisar Sayed <Nisar.Sayed@...rochip.com>
Cc: Yuiko Oshino <yuiko.oshino@...rochip.com>
Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
---
For the lan87xx_handle_interrupt() implementation, I do not know which
exact bits denote a link change status (since I do not have access to a
datasheet), so only in this driver's case, the phy state machine is
triggered if any bit is asserted in the Interrupt status register.

 drivers/net/phy/microchip.c    | 19 +++++++++++++++++++
 drivers/net/phy/microchip_t1.c | 19 +++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/drivers/net/phy/microchip.c b/drivers/net/phy/microchip.c
index a644e8e5071c..b472a2149f08 100644
--- a/drivers/net/phy/microchip.c
+++ b/drivers/net/phy/microchip.c
@@ -56,6 +56,24 @@ static int lan88xx_phy_ack_interrupt(struct phy_device *phydev)
 	return rc < 0 ? rc : 0;
 }
 
+static irqreturn_t lan88xx_handle_interrupt(struct phy_device *phydev)
+{
+	int irq_status;
+
+	irq_status = phy_read(phydev, LAN88XX_INT_STS);
+	if (irq_status < 0) {
+		phy_error(phydev);
+		return IRQ_NONE;
+	}
+
+	if (!(irq_status & LAN88XX_INT_STS_LINK_CHANGE_))
+		return IRQ_NONE;
+
+	phy_trigger_machine(phydev);
+
+	return IRQ_HANDLED;
+}
+
 static int lan88xx_suspend(struct phy_device *phydev)
 {
 	struct lan88xx_priv *priv = phydev->priv;
@@ -342,6 +360,7 @@ static struct phy_driver microchip_phy_driver[] = {
 
 	.ack_interrupt	= lan88xx_phy_ack_interrupt,
 	.config_intr	= lan88xx_phy_config_intr,
+	.handle_interrupt = lan88xx_handle_interrupt,
 
 	.suspend	= lan88xx_suspend,
 	.resume		= genphy_resume,
diff --git a/drivers/net/phy/microchip_t1.c b/drivers/net/phy/microchip_t1.c
index 1c9900162619..04cda8865deb 100644
--- a/drivers/net/phy/microchip_t1.c
+++ b/drivers/net/phy/microchip_t1.c
@@ -203,6 +203,24 @@ static int lan87xx_phy_ack_interrupt(struct phy_device *phydev)
 	return rc < 0 ? rc : 0;
 }
 
+static irqreturn_t lan87xx_handle_interrupt(struct phy_device *phydev)
+{
+	int irq_status;
+
+	irq_status = phy_read(phydev, LAN87XX_INTERRUPT_SOURCE);
+	if (irq_status < 0) {
+		phy_error(phydev);
+		return IRQ_NONE;
+	}
+
+	if (irq_status == 0)
+		return IRQ_NONE;
+
+	phy_trigger_machine(phydev);
+
+	return IRQ_HANDLED;
+}
+
 static int lan87xx_config_init(struct phy_device *phydev)
 {
 	int rc = lan87xx_phy_init(phydev);
@@ -222,6 +240,7 @@ static struct phy_driver microchip_t1_phy_driver[] = {
 
 		.ack_interrupt  = lan87xx_phy_ack_interrupt,
 		.config_intr    = lan87xx_phy_config_intr,
+		.handle_interrupt = lan87xx_handle_interrupt,
 
 		.suspend        = genphy_suspend,
 		.resume         = genphy_resume,
-- 
2.28.0