[PATCH net-next 03/18] net: phy: microchip: implement generic .handle_interrupt() callback

From: Ioana Ciornei
Date: Thu Nov 12 2020 - 11:00:15 EST


From: Ioana Ciornei <ioana.ciornei@xxxxxxx>

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@xxxxxxxxxxxxx>
Cc: Yuiko Oshino <yuiko.oshino@xxxxxxxxxxxxx>
Signed-off-by: Ioana Ciornei <ioana.ciornei@xxxxxxx>
---
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