sis630_set_eq(9)

🌸 NAME 🌸

okay so bestie, this is sis630_set_eq(9) from the Kernel API Manual, and it's literally the little function that sets the phy equalizer value for 630 LAN. No cap, that's the whole vibe. 🦋

✨ SYNOPSIS ✨

void sis630_set_eq (struct net_device *net_dev , u8 revision );

🎀 ARGUMENTS 🎀

• net_dev — the net device to set equalizer value. (the main character you're tweaking ✨)
• revision — 630 LAN revision number. (iykyk, it's the revision number fr fr)

💅 DESCRIPTION 💅

Okay so this is the 630E equalizer workaround rule (Cyrus Huang 08/15) — and it's all about PHY register 14h (Test). Here's the bit tea ☕:

• Bit 14: 0 — Automatically detect (default); 1 — Manually set Equalizer filter
• Bit 13: 0 — (Default); 1 — Speed up convergence of equalizer setting
• Bit 9: 0 — (Default); 1 — Disable Baseline Wander
• Bit 3~7 — Equalizer filter setting

🌈 Link ON 🌈

1. Set Bit 9, Bit 13 to 1, and Bit 14 to 0.
2. Then calculate equalizer value.
3. Then set equalizer value, and set Bit 14 to 1, Bit 9 to 0.

🦋 Link Off 🦋

Set Bit 13 to 1, and Bit 14 to 0.

🔥 Calculate Equalizer value 🔥

When Link is ON and Bit 14 is 0, SIS900PHY will auto-detect proper equalizer value. When the equalizer is stable, this value is not a fixed value. It will be within a small range (eg. 7~9). Then we get a minimum and a maximum value (eg. min=7, max=9). Then the rules are:

0 <= max <= 4   --> set equalizer to max
5 <= max <= 14  --> set equalizer to max+1 or set equalizer to max+2 if max == min
max >= 15       --> set equalizer to max+5 or set equalizer to max+6 if max == min

👑 SEE ALSO 👑

Bestie, the Kernel file is ./drivers/net/ethernet/sis/sis900.c, and the whole friend group is: sis900_get_mac_addr(9), sis630e_get_mac_addr(9), sis635_get_mac_addr(9), sis96x_get_mac_addr(9), sis900_probe(9), sis900_mii_probe(9), sis900_default_phy(9), sis900_set_capability(9), read_eeprom(9), mdio_read(9), mdio_write(9), sis900_reset_phy(9), sis900_open(9), sis900_init_rxfilter(9), sis900_init_tx_ring(9), sis900_init_rx_ring(9), sis900_timer(9), sis900_check_mode(9), sis900_set_mode(9), sis900_auto_negotiate(9), sis900_read_mode(9), sis900_tx_timeout(9), sis900_start_xmit(9), sis900_interrupt(9), sis900_rx(9), sis900_finish_xmit(9), sis900_close(9), sis900_get_drvinfo(9), sis900_set_wol(9), mii_ioctl(9), sis900_set_config(9), sis900_mcast_bitnr(9), set_rx_mode(9), sis900_reset(9), sis900_remove(9).

---

mwah 💋 — source/version: ./drivers/net/ethernet/sis, dated October 2026. Stay slay, bestie 💖