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phy: advertise pause on the forced speeds from 1G up

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The advertisement written for a forced speed of 1G and above is 0x1001,
while auto and the forced 10M and 100M modes all carry bit 10, the PAUSE
capability. Forcing a port to 1g or faster therefore takes pause off the
link: the advertisement narrows and the far end has nothing left to
agree to.

Measured on a SWTGW218AS through phyget and physet, on a port with no
link so nothing was disturbed. Auto reads 0x15e1, port 1 1g reads
0x1001, port 1 auto reads 0x15e1 again, and writing 0x1401 by hand
sticks. That bit 10 is the pause capability follows from a second
reading: two ports advertise the same 0x15e1 from this side, and pause
is active only against the partner whose own advertisement carries the
bit.

Reported by feelfree69 in #489.
This commit is contained in:
d00f committed 2026-09-22 23:12:50 +02:00
1 parent fa93340c24
commit 2c231fdf69
1 file changed
+3 -2
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rtl837x_phy.c
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@@ -354,8 +354,9 @@ void phy_set_speed(void) __banked
phy_modify(phy_settings.port, PHY_MMD31, PHY_MMD31_GBCR, 0x0200, 0x0000); phy_modify(phy_settings.port, PHY_MMD31, PHY_MMD31_GBCR, 0x0200, 0x0000);
} else { } else {
// AN Advertisement Register (MMD 7.0x0010) // AN Advertisement Register (MMD 7.0x0010)
// bits 0-4: 0x1 (802.3 supported), Extended Next Page format used // bits 0-4: 0x1 (802.3 supported), bit 10: PAUSE,
phy_write(phy_settings.port, PHY_MMD_AN, PHY_ANEG_ADV, 0x1001); // Extended Next Page format used
phy_write(phy_settings.port, PHY_MMD_AN, PHY_ANEG_ADV, 0x1401);
if (phy_settings.speed == PHY_SPEED_1G) { if (phy_settings.speed == PHY_SPEED_1G) {
// Multi-GBASE-TBASE-T AN Control 1 Register (MMD 7.0x0020) // Multi-GBASE-TBASE-T AN Control 1 Register (MMD 7.0x0020)
// bit 14: SLAVE, bit 13: Multi-Port device, 1: LD Loop timin enableed // bit 14: SLAVE, bit 13: Multi-Port device, 1: LD Loop timin enableed