[PATCH 5.19 153/207] net: phy: micrel: fix shared interrupt on LAN8814

Greg Kroah-Hartman
2022-09-26T11:56:50Z

From: Michael Walle <michael@walle.cc>

[ Upstream commit 2002fbac743b6e2391b4ed50ad9eb626768dd78a ]

Since commit ece19502834d ("net: phy: micrel: 1588 support for LAN8814
phy") the handler always returns IRQ_HANDLED, except in an error case.
Before that commit, the interrupt status register was checked and if
it was empty, IRQ_NONE was returned. Restore that behavior to play nice
with the interrupt line being shared with others.

Fixes: ece19502834d ("net: phy: micrel: 1588 support for LAN8814 phy")
Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Reviewed-by: Divya Koppera <Divya.Koppera@microchip.com>
Link: https://lore.kernel.org/r/20220920141619.808117-1-michael@walle.cc
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/phy/micrel.c | 18 ++++++++++++------
1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index 34483a4bd688..e8e1101911b2 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -2662,16 +2662,19 @@ static int lan8804_config_init(struct phy_device *phydev)
static irqreturn_t lan8814_handle_interrupt(struct phy_device *phydev)
{
int irq_status, tsu_irq_status;
+ int ret = IRQ_NONE;

irq_status = phy_read(phydev, LAN8814_INTS);
- if (irq_status > 0 && (irq_status & LAN8814_INT_LINK))
- phy_trigger_machine(phydev);
-
if (irq_status < 0) {
phy_error(phydev);
return IRQ_NONE;
}

+ if (irq_status & LAN8814_INT_LINK) {
+ phy_trigger_machine(phydev);
+ ret = IRQ_HANDLED;
+ }
+
while (1) {
tsu_irq_status = lanphy_read_page_reg(phydev, 4,
LAN8814_INTR_STS_REG);
@@ -2680,12 +2683,15 @@ static irqreturn_t lan8814_handle_interrupt(struct phy_device *phydev)
(tsu_irq_status & (LAN8814_INTR_STS_REG_1588_TSU0_ |
LAN8814_INTR_STS_REG_1588_TSU1_ |
LAN8814_INTR_STS_REG_1588_TSU2_ |
- LAN8814_INTR_STS_REG_1588_TSU3_)))
+ LAN8814_INTR_STS_REG_1588_TSU3_))) {
lan8814_handle_ptp_interrupt(phydev);
- else
+ ret = IRQ_HANDLED;
+ } else {
break;
+ }
}
- return IRQ_HANDLED;
+
+ return ret;
}

static int lan8814_ack_interrupt(struct phy_device *phydev)
--
2.35.1