[V1,5/7] ARM: dts: imx6qdl-sabrelite: use GPIO_6 for FEC interrupt.

Commit Message

Troy Kisky Dec. 18, 2013, 10:41 p.m. UTC

This works around a hardware bug.
Quoting from Ranjani Vaidyanathan:

All of the interrupts from the ENET block are not routed to
the GPC block. Hence ENET interrupts are not able to wake
up the SOC when the system is in WAIT mode. And the ENET
interrupt gets serviced only when another interrupt causes
the SOC to exit WAIT mode. This impacts the ENET performance.

Before this patch, ping times of a Sabre Lite board are quite
random:
ping 192.168.0.13 -i.5 -c5
PING 192.168.0.13 (192.168.0.13) 56(84) bytes of data.
64 bytes from 192.168.0.13: icmp_req=1 ttl=64 time=15.7 ms
64 bytes from 192.168.0.13: icmp_req=2 ttl=64 time=14.4 ms
64 bytes from 192.168.0.13: icmp_req=3 ttl=64 time=13.4 ms
64 bytes from 192.168.0.13: icmp_req=4 ttl=64 time=12.4 ms
64 bytes from 192.168.0.13: icmp_req=5 ttl=64 time=11.4 ms

--- 192.168.0.13 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 2004ms
rtt min/avg/max/mdev = 11.431/13.501/15.746/1.508 ms

Patch

diff --git a/arch/arm/boot/dts/imx6qdl-nitrogen6x.dtsi b/arch/arm/boot/dts/imx6qdl-nitrogen6x.dtsi
index ef5ce885..9909c36 100644
--- a/arch/arm/boot/dts/imx6qdl-nitrogen6x.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-nitrogen6x.dtsi
@@ -164,6 +164,8 @@ 
 	txd1-skew-ps = <0>;
 	txd2-skew-ps = <0>;
 	txd3-skew-ps = <0>;
+	interrupts-extended = <&gpio1 6 IRQ_TYPE_LEVEL_HIGH>,
+			      <&intc 0 119 IRQ_TYPE_LEVEL_HIGH>;
 	status = "okay";
 };
 
@@ -210,6 +212,7 @@ 
 				MX6QDL_ENET_PINGRP_RGMII_MD(0x1b0b0, 0x100b0)
 				/* Phy reset */
 				MX6QDL_PAD_ENET_RXD0__GPIO1_IO27	0x000b0
+				MX6QDL_PAD_GPIO_6__ENET_IRQ		0x000b1
 			>;
 		};
 
diff --git a/arch/arm/boot/dts/imx6qdl-sabrelite.dtsi b/arch/arm/boot/dts/imx6qdl-sabrelite.dtsi
index db06e40..8b620b5 100644
--- a/arch/arm/boot/dts/imx6qdl-sabrelite.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-sabrelite.dtsi
@@ -163,6 +163,8 @@ 
 	txd1-skew-ps = <0>;
 	txd2-skew-ps = <0>;
 	txd3-skew-ps = <0>;
+	interrupts-extended = <&gpio1 6 IRQ_TYPE_LEVEL_HIGH>,
+			      <&intc 0 119 IRQ_TYPE_LEVEL_HIGH>;
 	status = "okay";
 };
 
@@ -209,6 +211,7 @@ 
 				MX6QDL_ENET_PINGRP_RGMII_MD(0x1b0b0, 0x100b0)
 				/* Phy reset */
 				MX6QDL_PAD_EIM_D23__GPIO3_IO23		0x000b0
+				MX6QDL_PAD_GPIO_6__ENET_IRQ		0x000b1
 			>;
 		};