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authorUwe Kleine-König <u.kleine-koenig@pengutronix.de>2018-07-19 21:38:23 +0200
committerShawn Guo <shawnguo@kernel.org>2018-07-20 10:50:44 +0800
commite01a06c8089132bb4da035c6a83df23916ca3ebf (patch)
treea806a802c5680787c6a8dc6bfe4bbf000509418f
parentsoc: imx: gpc: restrict register range for regmap access (diff)
downloadlinux-dev-e01a06c8089132bb4da035c6a83df23916ca3ebf.tar.xz
linux-dev-e01a06c8089132bb4da035c6a83df23916ca3ebf.zip
ARM: dts: imx6: RDU2: fix irq type for mv88e6xxx switch
The Marvell switches report their interrupts in a level sensitive way. When using edge sensitive detection a race condition in the interrupt handler of the swich might result in the OS to miss all future events which might make the switch non-functional. The problem is that both mv88e6xxx_g2_irq_thread_fn() and mv88e6xxx_g1_irq_thread_work() sample the irq cause register (MV88E6XXX_G2_INT_SRC and MV88E6XXX_G1_STS respectively) once and then handle the observed sources. If after sampling but before all observed irq sources are handled a new irq source gets active this is not noticed by the handler which returns unsuspecting, but the interrupt line stays active which prevents the edge detector to kick in. All device trees but imx6qdl-zii-rdu2 get this right (most of them by not specifying an interrupt parent). So fix imx6qdl-zii-rdu2 accordingly. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Fixes: f64992d1a916 ("ARM: dts: imx6: RDU2: Add Switch interrupts") Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
-rw-r--r--arch/arm/boot/dts/imx6qdl-zii-rdu2.dtsi2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/boot/dts/imx6qdl-zii-rdu2.dtsi b/arch/arm/boot/dts/imx6qdl-zii-rdu2.dtsi
index 19a075aee19e..f14df0baf2ab 100644
--- a/arch/arm/boot/dts/imx6qdl-zii-rdu2.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-zii-rdu2.dtsi
@@ -692,7 +692,7 @@
dsa,member = <0 0>;
eeprom-length = <512>;
interrupt-parent = <&gpio6>;
- interrupts = <3 IRQ_TYPE_EDGE_FALLING>;
+ interrupts = <3 IRQ_TYPE_LEVEL_LOW>;
interrupt-controller;
#interrupt-cells = <2>;