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net: phy: icplus: Use the RGMII interface mode to configure clock delays

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Like several other PHY devices which support RGMII, the IC+1001 allows
additional delays to by added to the RX_CLK and TX_CLK signals to
compensate for skew between the clock and data signals. Previously this
was always enabled, but this change makes use of the different RGMII
interface modes to allow the user to specify whether this should be
enabled.

Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stuart Menefy 2013-01-23 00:22:36 +00:00 committed by David S. Miller
parent 5465740ace
commit b4a496319f
1 changed files with 16 additions and 5 deletions
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21
drivers/net/phy/icplus.c
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@ -36,8 +36,9 @@ MODULE_LICENSE("GPL");
/* IP101A/G - IP1001 */
#define IP10XX_SPEC_CTRL_STATUS 16 /* Spec. Control Register */
#define IP1001_RXPHASE_SEL (1<<0) /* Add delay on RX_CLK */
#define IP1001_TXPHASE_SEL (1<<1) /* Add delay on TX_CLK */
#define IP1001_SPEC_CTRL_STATUS_2 20 /* IP1001 Spec. Control Reg 2 */
#define IP1001_PHASE_SEL_MASK 3 /* IP1001 RX/TXPHASE_SEL */
#define IP1001_APS_ON 11 /* IP1001 APS Mode bit */
#define IP101A_G_APS_ON 2 /* IP101A/G APS Mode bit */
#define IP101A_G_IRQ_CONF_STATUS 0x11 /* Conf Info IRQ & Status Reg */
@ -143,14 +144,24 @@ static int ip1001_config_init(struct phy_device *phydev)
if (c < 0)
return c;
if (phydev->interface == PHY_INTERFACE_MODE_RGMII) {
/* Additional delay (2ns) used to adjust RX clock phase
* at RGMII interface */
if ((phydev->interface == PHY_INTERFACE_MODE_RGMII) ||
(phydev->interface == PHY_INTERFACE_MODE_RGMII_ID) ||
(phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID) ||
(phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID)) {
c = phy_read(phydev, IP10XX_SPEC_CTRL_STATUS);
if (c < 0)
return c;
c |= IP1001_PHASE_SEL_MASK;
c &= ~(IP1001_RXPHASE_SEL | IP1001_TXPHASE_SEL);
if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
c |= (IP1001_RXPHASE_SEL | IP1001_TXPHASE_SEL);
else if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID)
c |= IP1001_RXPHASE_SEL;
else if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID)
c |= IP1001_TXPHASE_SEL;
c = phy_write(phydev, IP10XX_SPEC_CTRL_STATUS, c);
if (c < 0)
return c;