ARM: dts: pfla02: increase phy reset duration [Linux 5.1]

ARM: dts: pfla02: increase phy reset duration [Linux 5.1]

This Linux kernel change "ARM: dts: pfla02: increase phy reset duration" is included in the Linux 5.1 release. This change is authored by Marco Felsch <m.felsch [at] pengutronix.de> on Mon Mar 4 11:49:40 2019 +0100. The commit for this change in Linux stable tree is 032f85c (patch).

ARM: dts: pfla02: increase phy reset duration

Increase the reset duration to ensure correct phy functionality. The
reset duration is taken from barebox commit 52fdd510de ("ARM: dts:
pfla02: use long enough reset for ethernet phy"):

  Use a longer reset time for ethernet phy Micrel KSZ9031RNX. Otherwise a
  small percentage of modules have 'transmission timeouts' errors like

  barebox@Phytec phyFLEX-i.MX6 Quad Carrier-Board:/ ifup eth0
  warning: No MAC address set. Using random address 7e:94:4d:02:f8:f3
  eth0: 1000Mbps full duplex link detected
  eth0: transmission timeout
  T eth0: transmission timeout
  T eth0: transmission timeout
  T eth0: transmission timeout
  T eth0: transmission timeout

Cc: Stefan Christ <s.christ@phytec.de>
Cc: Christian Hemp <c.hemp@phytec.de>
Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Fixes: 3180f956668e ("ARM: dts: Phytec imx6q pfla02 and pbab01 support")
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

There is one line of Linux source code added/deleted in this change. Code changes to Linux kernel are as follows.

 arch/arm/boot/dts/imx6qdl-phytec-pfla02.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/imx6qdl-phytec-pfla02.dtsi b/arch/arm/boot/dts/imx6qdl-phytec-pfla02.dtsi
index 433bf09..027df06 100644
--- a/arch/arm/boot/dts/imx6qdl-phytec-pfla02.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-phytec-pfla02.dtsi
@@ -91,6 +91,7 @@
    pinctrl-0 = <&pinctrl_enet>;
    phy-handle = <&ethphy>;
    phy-mode = "rgmii";
+   phy-reset-duration = <10>; /* in msecs */
    phy-reset-gpios = <&gpio3 23 GPIO_ACTIVE_LOW>;
    phy-supply = <&vdd_eth_io_reg>;
    status = "disabled";

Leave a Reply

Your email address will not be published. Required fields are marked *