Change Details

Some pine64 models have a problem with the Gigabit ethernet dropping packets incredibly frequently. Fix this by supposedly disabling RX delay if the A64 emac is configured in RGMII mode. These registers are undocumented; this approach is pulled from a dual BSD/GPL licensed GMAC driver in longsleep's Pine64 kernel: https://github.com/longsleep/linux-pine64/commit/ffe3ca5be7682bbeb0fdadede29acd4a3c888015

Some pine64 models have a problem with the Gigabit ethernet dropping packets frequently. The Pine64 engineering team's supplied fix is to reconfigure the RTL8211E used to force off TXD/RXD (RXD is defaulting to on, in my checks) and turn on some bits in the configuration register for this PHY that are undocumented. See: this dual BSD/GPL licensed driver change: https://github.com/longsleep/linux-pine64/commit/ffe3ca5be7682bbeb0fdadede29acd4a3c888015 As an aside- I wasn't sure how to handle the specifics of when to apply it, so I opted for doing an FDT check in rgephy_attach and simply enabling a 'quirk' if we're on an affected model and configured for RGMII (uses RTL8211E specifically). I don't know if this 'quirks' flag is overkill since this will probably be our only quirk.

Some pine64 models have a problem with the Gigabit ethernet dropping packets incredibly frequently.frequently. The Pine64 engineering team's supplied fix is to reconfigure the RTL8211E used to force off TXD/RXD (RXD is defaulting to on, Fix this by supposedly disabling RX delay if the A64 emac is configured in RGMII modein my checks) and turn on some bits in the configuration register for this PHY that are undocumented. These registers are undocumented;See: this dual BSD/GPL licensed driver change: https://github.com/longsleep/linux-pine64/commit/ffe3ca5be7682bbeb0fdadede29acd4a3c888015 As an aside- I wasn't sure how to handle the specifics of when to apply it, this approach is pulled from a dual BSD/GPL licensed GMAC driver in longsleep's Pine64 kernel: https://github.com/longsleep/linux-pine64/commit/ffe3ca5be7682bbeb0fdadede29acd4a3c888015so I opted for doing an FDT check in rgephy_attach and simply enabling a 'quirk' if we're on an affected model and configured for RGMII (uses RTL8211E specifically). I don't know if this 'quirks' flag is overkill since this will probably be our only quirk.