On 8/12/2019 4:23 AM, Alexandru Ardelean wrote: > The ADIN PHYs support automatic MDI/MDIX negotiation. By default this is > disabled, so this is enabled at `config_init`. > > This is controlled via the PHY Control 1 register. > The supported modes are: > 1. Manual MDI > 2. Manual MDIX > 3. Auto MDIX - prefer MDIX > 4. Auto MDIX - prefer MDI > > The phydev mdix & mdix_ctrl fields include modes 3 & 4 into a single > auto-mode. So, the default mode this driver enables is 4 when Auto-MDI mode > is used. > > When detecting MDI/MDIX mode, a combination of the PHY Control 1 register > and PHY Status 1 register is used to determine the correct MDI/MDIX mode. > > If Auto-MDI mode is not set, then the manual MDI/MDIX mode is returned. > If Auto-MDI mode is set, then MDIX mode is returned differs from the > preferred MDI/MDIX mode. > This covers all cases where: > 1. MDI preferred & Pair01Swapped == MDIX > 2. MDIX preferred & Pair01Swapped == MDI > 3. MDI preferred & ! Pair01Swapped == MDIX > 4. MDIX preferred & ! Pair01Swapped == MDI > > The preferred MDI/MDIX mode is not configured via SW, but can be configured > via HW pins. Note that the `Pair01Swapped` is the Green-Yellow physical > pairs. > > Signed-off-by: Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx> Reviewed-by: Florian Fainelli <f.fainelli@xxxxxxxxx> -- Florian
