AR# 72806


2019.1 Linux: MACB + PL PCS PMA link issues on Zynq UltraScale+ MPSoC


In some situations a PL PCS PMA IP connected to the PS GEM might not to link up when ifconfig down/up is done. 

The PS GEM has runtime clock handling which can result in the IP, which shares this clock, requiring reconfiguration.


To work around this issue, you will need to have a GPIO reset in the design and also to do a PHY reset in macb_open.

You can apply the attached Linux kernel patches to do this.

The PHY framework allows you to reset the PHY through an API, with a check for a PHY flag requiring reset.

You will need to enable this flag in the PCS PMA driver and request a PHY reset in the macb driver. 

The API returns 1 in case of a successful reset and this is checked to reinitialize the PHY.


Associated Attachments

AR# 72806
Date 11/04/2019
Status Active
Type Known Issues
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