| Message ID | 20210625083051.3691737-1-maxime.chevallier@bootlin.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | ARM: dts: imx6qdl-sr-som: Increase the PHY reset duration to 10ms | expand |
diff --git a/arch/arm/boot/dts/imx6qdl-sr-som.dtsi b/arch/arm/boot/dts/imx6qdl-sr-som.dtsi index 0ad8ccde0cf8..a54dafce025b 100644 --- a/arch/arm/boot/dts/imx6qdl-sr-som.dtsi +++ b/arch/arm/boot/dts/imx6qdl-sr-som.dtsi @@ -54,7 +54,7 @@ &fec { pinctrl-names = "default"; pinctrl-0 = <&pinctrl_microsom_enet_ar8035>; phy-mode = "rgmii-id"; - phy-reset-duration = <2>; + phy-reset-duration = <10>; phy-reset-gpios = <&gpio4 15 GPIO_ACTIVE_LOW>; status = "okay";
The datasheet for the AR803x PHY present on this SoM recommends that the reset line is asserted low for 10ms, so that the PHY has time to properly reset the internal blocks. The previous value of 2ms was found to be problematic on some setups, causing intermittent issues where the PHY would be unresponsive every once in a while on some sytems, with a low occurence (it typically took around 30 consecutive reboots to encounter the issue). Bumping the delay to the 10ms recommended value makes the issue dissapear, with more than 2500 consecutive reboots performed without the issue showing-up. Fixes: 208d7baf8085 ("ARM: imx: initial SolidRun HummingBoard support") Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com> Tested-by: Hervé Codina <herve.codina@bootlin.com> --- arch/arm/boot/dts/imx6qdl-sr-som.dtsi | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)