diff options
Diffstat (limited to 'drivers/net/phy/micrel.c')
| -rw-r--r-- | drivers/net/phy/micrel.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c index 225d4adf28be..b2a584b60bff 100644 --- a/drivers/net/phy/micrel.c +++ b/drivers/net/phy/micrel.c @@ -101,6 +101,14 @@ #define LAN8814_CABLE_DIAG_VCT_DATA_MASK GENMASK(7, 0) #define LAN8814_PAIR_BIT_SHIFT 12 +/* KSZ9x31 remote loopback register */ +#define KSZ9x31_REMOTE_LOOPBACK 0x11 +/* This is an undocumented bit of the KSZ9131RNX. + * It was reported by NXP in cooperation with Micrel. + */ +#define KSZ9x31_REMOTE_LOOPBACK_KEEP_PREAMBLE BIT(2) +#define KSZ9x31_REMOTE_LOOPBACK_EN BIT(8) + #define LAN8814_SKUS 0xB #define LAN8814_WIRE_PAIR_MASK 0xF @@ -1500,7 +1508,11 @@ static int ksz9131_config_init(struct phy_device *phydev) if (ret < 0) return ret; - return 0; + if (phydev->dev_flags & PHY_F_KEEP_PREAMBLE_BEFORE_SFD) + ret = phy_modify(phydev, KSZ9x31_REMOTE_LOOPBACK, 0, + KSZ9x31_REMOTE_LOOPBACK_KEEP_PREAMBLE); + + return ret; } #define MII_KSZ9131_AUTO_MDIX 0x1C |