[U-Boot] [PATCH 2/2] net: phy: at803x: Address packet drops at low traffic rate due to SmartEEE feature

[Joe Hershberger]

On Tue, Dec 18, 2018 at 7:22 PM Vladimir Oltean <vladimir.oltean at nxp.com> wrote:
>
> * According to the AR8031 and AR8035 datasheets, smartEEE mode
>   (active by default) makes the PHY enter sleep after a configurable
>   idle time. It does this autonomously, without LPI (Low Power Idle)
>   signals coming from MAC. AR8021 does not appear to support this.
> * This patch allows disabling the SmartEEE feature of above PHYs.
> * Tested with ping (default of 1 second interval) over back-to-back
>   RGMII between 2 boards having AR8035 at both ends:
>     - Without SmartEEE:
>   225 packets transmitted, 145 received, 35% packet loss, time 229334ms
>     - With SmartEEE:
>   144 packets transmitted, 144 received, 0% packet loss, time 146378ms
>
> Signed-off-by: Vladimir Oltean <vladimir.oltean at nxp.com>

Acked-by: Joe Hershberger <joe.hershberger at ni.com>