[FS#4031] Uplink ethernet ports not connecting at gigabit speeds (Ath79)

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The following task has a new comment added:

FS#4031 - Uplink ethernet ports not connecting at gigabit speeds (Ath79)
User who did this - Boris Gjenero (dreamlayers)

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This problem is already solved in master branch via https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=766e0f584a325b0b80a97bbc86ca515d97c63001

Quoting from the commit message:
    Modifying PHY capabilities in the probe function broke with upstream
    commit 92ed2eb7f4b7 ("net: phy: probe the PHY before determining the
    supported features").
    
    AR8316 switches only support 10/100 Mbit/s link modes because of this
    change.
    
    Provide a get_features method for the PHY driver, so Gigabit link mode
    will be advertised to link partners again.

The fix is not in 21.02.0. You can add it before building from source via:
    git cherry-pick 766e0f584a325b0b80a97bbc86ca515d97c63001

It would be nice if this fix could be included in future releases of version 21.
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=4031#comment10193

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