diff options
| author | Vinod Koul <vkoul@kernel.org> | 2019-02-21 15:53:15 +0530 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-02-22 15:30:03 -0800 |
| commit | 6d4cd041f0af5b4c8fc742b4a68eac22e420e28c (patch) | |
| tree | 65cea3fcbc0e15e87ae9d17873567ae3560c2982 /drivers/net/phy/at803x.c | |
| parent | 43f2ebd5571653f5a02c178d6d73ab642e8a0cad (diff) | |
| download | linux-6d4cd041f0af5b4c8fc742b4a68eac22e420e28c.tar.bz2 | |
net: phy: at803x: disable delay only for RGMII mode
Per "Documentation/devicetree/bindings/net/ethernet.txt" RGMII mode
should not have delay in PHY whereas RGMII_ID and RGMII_RXID/RGMII_TXID
can have delay in PHY.
So disable the delay only for RGMII mode and enable for other modes.
Also treat the default case as disabled delays.
Fixes: cd28d1d6e52e: ("net: phy: at803x: Disable phy delay for RGMII mode")
Reported-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Reviewed-by: Niklas Cassel <niklas.cassel@linaro.org>
Tested-by: Peter Ujfalusi <peter.ujflausi@ti.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/phy/at803x.c')
| -rw-r--r-- | drivers/net/phy/at803x.c | 53 |
1 files changed, 42 insertions, 11 deletions
diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c index 3bcdb28b6366..f3e96191eb6f 100644 --- a/drivers/net/phy/at803x.c +++ b/drivers/net/phy/at803x.c @@ -103,6 +103,18 @@ static int at803x_debug_reg_mask(struct phy_device *phydev, u16 reg, return phy_write(phydev, AT803X_DEBUG_DATA, val); } +static int at803x_enable_rx_delay(struct phy_device *phydev) +{ + return at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_0, 0, + AT803X_DEBUG_RX_CLK_DLY_EN); +} + +static int at803x_enable_tx_delay(struct phy_device *phydev) +{ + return at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_5, 0, + AT803X_DEBUG_TX_CLK_DLY_EN); +} + static int at803x_disable_rx_delay(struct phy_device *phydev) { return at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_0, @@ -241,23 +253,42 @@ static int at803x_config_init(struct phy_device *phydev) if (ret < 0) return ret; - if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID || - phydev->interface == PHY_INTERFACE_MODE_RGMII_ID || - phydev->interface == PHY_INTERFACE_MODE_RGMII) { - ret = at803x_disable_rx_delay(phydev); + /* The RX and TX delay default is: + * after HW reset: RX delay enabled and TX delay disabled + * after SW reset: RX delay enabled, while TX delay retains the + * value before reset. + * + * So let's first disable the RX and TX delays in PHY and enable + * them based on the mode selected (this also takes care of RGMII + * mode where we expect delays to be disabled) + */ + + ret = at803x_disable_rx_delay(phydev); + if (ret < 0) + return ret; + ret = at803x_disable_tx_delay(phydev); + if (ret < 0) + return ret; + + if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID || + phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID) { + /* If RGMII_ID or RGMII_RXID are specified enable RX delay, + * otherwise keep it disabled + */ + ret = at803x_enable_rx_delay(phydev); if (ret < 0) return ret; } - if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID || - phydev->interface == PHY_INTERFACE_MODE_RGMII_ID || - phydev->interface == PHY_INTERFACE_MODE_RGMII) { - ret = at803x_disable_tx_delay(phydev); - if (ret < 0) - return ret; + if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID || + phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID) { + /* If RGMII_ID or RGMII_TXID are specified enable TX delay, + * otherwise keep it disabled + */ + ret = at803x_enable_tx_delay(phydev); } - return 0; + return ret; } static int at803x_ack_interrupt(struct phy_device *phydev) |