On Fri, Feb 12, 2021 at 11:40:59PM +0100, Michael Walle wrote: > Fun fact, now it may be the other way around. If the bootloader doesn't > configure it and the PHY isn't reset by the hardware, it won't work in > the bootloader after a reboot ;)
If we start messing around with the configuration of PHYs in that regard, we could be opening ourselves up for a world of pain... > If you disable aneg between MAC and PHY, what would be the actual speed > setting/duplex mode then? I guess it have to match the external speed? That is a function of the interface mode and the PHY capabilities. 1) if the PHY supports rate adaption, and is programmed for that, then the PHY link normally operates at a fixed speed (e.g. 1G for SGMII) and the PHY converts to the appropriate speed. We don't actually support this per se, since the parameters we give to the MAC via mac_link_up() are the media side parameters, not the link parameters. 2) if the PHY does not support rate adaption, then the MAC to PHY link needs to follow the media speed and duplex. phylink will be in "PHY" mode, where it passes the media side negotiation results to the MAC just like phylib would, and the MAC should be programmed appropriately. In the case of a SGMII link, the link needs to be programmed to do the appropriate symbol repetition for 100M and 10M speeds. The PHY /should/ do that automatically, but if it doesn't, then the PHY also needs to be programmed to conform. (since if there's no rate adaption in the PHY, the MAC side and the media side must match.) Hope that helps. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
