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

[Andrew Lunn]

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