Re: [PATCH 01/20] net: phy: realtek: Fix events detection failure in LPI mode

On Mon, Feb 08, 2021 at 05:03:22PM +0300, Serge Semin wrote:

It has been noticed that RTL8211E PHY stops detecting and reporting events
when EEE is successfully advertised and RXC stopping in LPI is enabled.
The freeze happens right after 3.0.10 bit (PC1R "Clock Stop Enable"
register) is set. At the same time LED2 stops blinking as if EEE mode has
been disabled. Notably the network traffic still flows through the PHY
with no obvious problem. Anyway if any MDIO read procedure is performed
after the "RXC stop in LPI" mode is enabled PHY gets to be unfrozen, LED2
starts blinking and PHY interrupts happens again. The problem has been
noticed on RTL8211E PHY working together with DW GMAC 3.73a MAC and
reporting its event via a dedicated IRQ signal. (Obviously the problem has
been unnoticed in the polling mode, since it gets naturally fixed by the
periodic MDIO read procedure from the PHY status register - BMSR.)

In order to fix that problem we suggest to locally re-implement the MMD
write method for RTL8211E PHY and perform a dummy read right after the
PC1R register is accessed to enable the RXC stopping in LPI mode.

Hi Serge

Is this listed in an Errata from Realtek?

   Andrew