On Wed, 26 Feb 2020 at 15:36, Russell King - ARM Linux admin <linux@xxxxxxxxxxxxxxx> wrote: > > > dpaa2 is complicated by the firmware, and that we can't switch the > interface mode between (SGMII,1000base-X) and 10G. > > If the firmware is in "DPMAC_LINK_TYPE_PHY" mode, it expects to be told > the current link parameters via the dpmac_set_link_state() call - it > isn't clear whether that needs to be called for other modes with the > up/down state (firmware API documentation is poor.) > With PCS control in Linux, I am pretty sure that you don't want anything other than DPMAC_LINK_TYPE_PHY anyway. Basically in DPMAC_LINK_TYPE_FIXED, the MC firmware is in control of the PCS and polls its link state to emit link notifications to objects connected to the DPMAC. So Linux control of PCS would class with firmware control of the PCS, leading to undesirable side-effects to say the least. > -- > RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ > FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up > According to speedtest.net: 11.9Mbps down 500kbps up Regards, -Vladimir
