Drivers net ksz9477 fixes #16906
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Drivers net ksz9477 fixes #16906
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From the ksz9477 errata, setup the configuration which is tested to work. - Improve PHY receive performance - Disable EEE for ports 1-5 - Fix supply current values Signed-off-by: Jani Paalijarvi <jani.paalijarvi@unikie.com>
Instead of verifying MMD indirect access by checking EEE ADVERTISEMENT register has value 0x6 (which may be changed), the verification is done by write and check LED MODE register. 1. Backup current LED_MODE register value 2. Write value Single-LED mode (0x10) to LED_MODE 3. Read LED_MODE register and verify it returns value 0x10 4. Write original (backup) value to LED_MODE
xiaoxiang781216
approved these changes
Aug 26, 2025
acassis
approved these changes
Aug 26, 2025
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Summary
This improves the functionality of the ksz9477 i2c controlled ethernet switch driver, by implementing manufacturer's recommended errata workarounds.
Impact
Impacts only using ksz9477. Fixes connection issues and random failures after boot/initialization.
Testing
Tested on a custom hardware, where ksz9477 is initialized by NuttX via I2C on an MFPS250T SoC, and connects to several etherenet devices on the same board.