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net: phy: lan87xx: Allow more time for link detect
With EDPWRDOWN set in idle, it must be cleared before checking for ENERGYON going high, indicating that a link is being established. The existing code allows 640ms for ENERGYON to go high, but on Raspberry Pis that appears not to be enough, causing link detection to fail. Increase the polling timeout to 1500ms - with a polling interval of 10ms it shouldn't cause unnecessary delays. See: #4393 Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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