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On the LeMaker Banana Pi, probing the external ethernet PHY connected to the SoC's internal GMAC module sometimes fails. The PHY power supply is handled via a GPIO-controlled regulator, and the existing regulator startup-delay of 50000us is too short to make sure that the PHY is always fully powered up when it is queried by phylib. Tests have shown that to provide a reliable PHY detection, the startup-delay has to be increased to at least 60000us. To have a certain safety margin and to cater for manufacturing variations between different boards, the delay gets set to 100000us as discussed on the linux-arm-kernel mailinglist. Signed-off-by: Karsten Merker <merker@debian.org> Acked-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> |
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