On Thu, May 26, 2022 at 05:03:47PM +0800, Tan Tee Min wrote:
There is a limitation in TI DP83867 PHY device where SGMII AN is only triggered once after the device is booted up. Even after the PHY TPI is down and up again, SGMII AN is not triggered and hence no new in-band message from PHY to MAC side SGMII.
This could cause an issue during power up, when PHY is up prior to MAC. At this condition, once MAC side SGMII is up, MAC side SGMII wouldn`t receive new in-band message from TI PHY with correct link status, speed and duplex info.
As suggested by TI, implemented a SW solution here to retrigger SGMII Auto-Neg whenever there is a link change.
Is there a bit in the PHY which reports host side link? There is no point triggering an AN if there is already link.
Andrew