diff options
| -rw-r--r-- | drivers/net/phy/marvell.c | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c index e9deedea5f19..2c04e3b2b285 100644 --- a/drivers/net/phy/marvell.c +++ b/drivers/net/phy/marvell.c @@ -214,6 +214,11 @@ #define MII_VCT5_TX_PULSE_CTRL_MAX_AMP BIT(7) #define MII_VCT5_TX_PULSE_CTRL_GT_140m_46_86mV (0x6 << 0) +/* For TDR measurements less than 11 meters, a short pulse should be + * used. + */ +#define TDR_SHORT_CABLE_LENGTH 11 + #define MII_VCT7_PAIR_0_DISTANCE 0x10 #define MII_VCT7_PAIR_1_DISTANCE 0x11 #define MII_VCT7_PAIR_2_DISTANCE 0x12 @@ -1835,14 +1840,19 @@ static int marvell_vct5_amplitude_graph(struct phy_device *phydev) { struct marvell_priv *priv = phydev->priv; int distance; + u16 width; int page; int err; u16 reg; + if (priv->first <= TDR_SHORT_CABLE_LENGTH) + width = MII_VCT5_TX_PULSE_CTRL_PULSE_WIDTH_32nS; + else + width = MII_VCT5_TX_PULSE_CTRL_PULSE_WIDTH_128nS; + reg = MII_VCT5_TX_PULSE_CTRL_GT_140m_46_86mV | MII_VCT5_TX_PULSE_CTRL_DONT_WAIT_LINK_DOWN | - MII_VCT5_TX_PULSE_CTRL_MAX_AMP | - MII_VCT5_TX_PULSE_CTRL_PULSE_WIDTH_32nS; + MII_VCT5_TX_PULSE_CTRL_MAX_AMP | width; err = phy_write_paged(phydev, MII_MARVELL_VCT5_PAGE, MII_VCT5_TX_PULSE_CTRL, reg); @@ -1866,6 +1876,17 @@ static int marvell_vct5_amplitude_graph(struct phy_device *phydev) priv->pair); if (err) goto restore_page; + + if (distance > TDR_SHORT_CABLE_LENGTH && + width == MII_VCT5_TX_PULSE_CTRL_PULSE_WIDTH_32nS) { + width = MII_VCT5_TX_PULSE_CTRL_PULSE_WIDTH_128nS; + reg = MII_VCT5_TX_PULSE_CTRL_GT_140m_46_86mV | + MII_VCT5_TX_PULSE_CTRL_DONT_WAIT_LINK_DOWN | + MII_VCT5_TX_PULSE_CTRL_MAX_AMP | width; + err = __phy_write(phydev, MII_VCT5_TX_PULSE_CTRL, reg); + if (err) + goto restore_page; + } } restore_page: |