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From: <Tristram.Ha@microchip.com>
To: Arun Ramadoss <arun.ramadoss@microchip.com>, Woojung Huh
	<woojung.huh@microchip.com>, Andrew Lunn <andrew@lunn.ch>, Vivien Didelot
	<vivien.didelot@gmail.com>, Florian Fainelli <f.fainelli@gmail.com>,
	"Vladimir Oltean" <olteanv@gmail.com>
CC: "David S. Miller" <davem@davemloft.net>, Eric Dumazet
	<edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>, Paolo Abeni
	<pabeni@redhat.com>, <UNGLinuxDriver@microchip.com>,
	<netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>, Tristram Ha
	<tristram.ha@microchip.com>
Subject: [PATCH v1 net] net: dsa: microchip: fix wrong register write when masking interrupt
Date: Thu, 30 May 2024 18:39:13 -0700
Message-ID: <1717119553-3441-1-git-send-email-Tristram.Ha@microchip.com>
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From: Tristram Ha <tristram.ha@microchip.com>

Initially the macro REG_SW_PORT_INT_MASK__4 is defined as 0x001C in
ksz9477_reg.h and REG_PORT_INT_MASK is defined as 0x#01F.  Because the
global and port interrupt handling is about the same the new
REG_SW_PORT_INT_MASK__1 is defined as 0x1F in ksz_common.h.  This works
as only the least significant bits have effect.  As a result the 32-bit
write needs to be changed to 8-bit.

Fixes: e1add7dd6183 ("net: dsa: microchip: use common irq routines for girq and pirq")
Signed-off-by: Tristram Ha <tristram.ha@microchip.com>
---
v1
 - clarify the reason to change the code

 drivers/net/dsa/microchip/ksz_common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 1e0085cd9a9a..3ad0879b00cd 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -2185,7 +2185,7 @@ static void ksz_irq_bus_sync_unlock(struct irq_data *d)
 	struct ksz_device *dev = kirq->dev;
 	int ret;
 
-	ret = ksz_write32(dev, kirq->reg_mask, kirq->masked);
+	ret = ksz_write8(dev, kirq->reg_mask, kirq->masked);
 	if (ret)
 		dev_err(dev->dev, "failed to change IRQ mask\n");
 
-- 
2.34.1