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net: sfp: relax bitrate-derived mode check

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Do not check the encoding when deriving 1000BASE-X from the bitrate
when no other modes are discovered. Some GPON modules (VSOL V2801F
and CarlitoxxPro CPGOS03-0490 v2.0) indicate NRZ encoding with a
1200Mbaud bitrate, but should be driven with 1000BASE-X on the host
side.

Tested-by: Pali Rohár <[email protected]>
Reviewed-by: Andrew Lunn <[email protected]>
Signed-off-by: Russell King <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Russell King
2020-12-09 19:38:10 -08:00
committed by David S. Miller
parent 0d035bed2a
commit 7a77233ec6
1 changed files with 5 additions and 6 deletions
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drivers/net/phy/sfp-bus.c
+5 -6
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@@ -334,14 +334,13 @@ void sfp_parse_support(struct sfp_bus *bus, const struct sfp_eeprom_id *id,
}
/* If we haven't discovered any modes that this module supports, try
* the encoding and bitrate to determine supported modes. Some BiDi
* modules (eg, 1310nm/1550nm) are not 1000BASE-BX compliant due to
* the differing wavelengths, so do not set any transceiver bits.
* the bitrate to determine supported modes. Some BiDi modules (eg,
* 1310nm/1550nm) are not 1000BASE-BX compliant due to the differing
* wavelengths, so do not set any transceiver bits.
*/
if (bitmap_empty(modes, __ETHTOOL_LINK_MODE_MASK_NBITS)) {
/* If the encoding and bit rate allows 1000baseX */
if (id->base.encoding == SFF8024_ENCODING_8B10B && br_nom &&
br_min <= 1300 && br_max >= 1200)
/* If the bit rate allows 1000baseX */
if (br_nom && br_min <= 1300 && br_max >= 1200)
phylink_set(modes, 1000baseX_Full);
}