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ramips: fix MT7621 switch driver IRQ storm on init with linux 4.14

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The hardware emits some interrupts while initializing and handling them
can mess up the state or cause infinite loops.
Fix this by disabling IRQs during init and re-enabling them afterwards

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2018-02-21 14:45:48 +01:00
parent 0405205140
commit 8a59f9590e
1 changed files with 7 additions and 4 deletions
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11
target/linux/ramips/files-4.14/drivers/net/ethernet/mtk/gsw_mt7621.c
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@ -41,6 +41,7 @@ static irqreturn_t gsw_interrupt_mt7621(int irq, void *_priv)
u32 reg, i;
reg = mt7530_mdio_r32(gsw, 0x700c);
mt7530_mdio_w32(gsw, 0x700c, reg);
for (i = 0; i < 5; i++)
if (reg & BIT(i)) {
@ -61,7 +62,6 @@ static irqreturn_t gsw_interrupt_mt7621(int irq, void *_priv)
}
mt7620_handle_carrier(priv);
mt7530_mdio_w32(gsw, 0x700c, 0x1f);
return IRQ_HANDLED;
}
@ -193,9 +193,8 @@ static void mt7621_hw_init(struct mt7620_gsw *gsw, struct device_node *np)
_mt7620_mii_write(gsw, i, 0, val);
}
/* mask irq */
mt7530_mdio_w32(gsw, 0x7008, 0x1f);
/* enable irq */
mt7530_mdio_w32(gsw, 0x7008, 0x1f);
val = mt7530_mdio_r32(gsw, 0x7808);
val |= 3 << 16;
mt7530_mdio_w32(gsw, 0x7808, val);
@ -225,10 +224,14 @@ int mtk_gsw_init(struct fe_priv *priv)
if (gsw->irq) {
request_irq(gsw->irq, gsw_interrupt_mt7621, 0,
"gsw", priv);
mt7530_mdio_w32(gsw, 0x7008, ~0x1f);
disable_irq(gsw->irq);
}
mt7621_hw_init(gsw, np);
if (gsw->irq)
enable_irq(gsw->irq);
return 0;
}