| Message ID | 20190218101853.4290-2-vkoul@kernel.org |
|---|---|
| State | New |
| Headers | show |
| Series | None | expand |
On Mon, Feb 18, 2019 at 03:48:53PM +0530, Vinod Koul wrote: > Per "Documentation/devicetree/bindings/net/ethernet.txt" RGMII mode > should not have delay in PHY wheras 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> > Signed-off-by: Vinod Koul <vkoul@kernel.org> > --- > drivers/net/phy/at803x.c | 47 ++++++++++++++++++++++++++++++---------- > 1 file changed, 36 insertions(+), 11 deletions(-) > > diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c > index c6e7d800fd7a..dc1b13f7fc12 100644 > --- a/drivers/net/phy/at803x.c > +++ b/drivers/net/phy/at803x.c > @@ -110,6 +110,18 @@ 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, > @@ -255,23 +267,36 @@ 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 hardware register default is RX and TX delay enabled, so lets > + * first disable the RX and TX delays in phy and enable them based > + * on the mode selected > + */ > + 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) > -- > 2.20.1 > Reviewed-by: Niklas Cassel <niklas.cassel@linaro.org>
diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c index c6e7d800fd7a..dc1b13f7fc12 100644 --- a/drivers/net/phy/at803x.c +++ b/drivers/net/phy/at803x.c @@ -110,6 +110,18 @@ 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, @@ -255,23 +267,36 @@ 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 hardware register default is RX and TX delay enabled, so lets + * first disable the RX and TX delays in phy and enable them based + * on the mode selected + */ + 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)
Per "Documentation/devicetree/bindings/net/ethernet.txt" RGMII mode should not have delay in PHY wheras 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> Signed-off-by: Vinod Koul <vkoul@kernel.org> --- drivers/net/phy/at803x.c | 47 ++++++++++++++++++++++++++++++---------- 1 file changed, 36 insertions(+), 11 deletions(-) -- 2.20.1