net/phy/vitesse: Configure RGMII skew on VSC8601, if needed

With RGMII, we need a 1.5 to 2ns skew between clock and data lines. The
VSC8601 can handle this internally. While the VSC8601 can set more
fine-grained delays, the standard skew settings work out of the box.
The same heuristic is used to determine when this skew should be enabled
as in vsc824x_config_init().

Tested on custom board with AM3352 SOC and VSC801 PHY.

Signed-off-by: Alexandru Gagniuc <alex.g@adaptrum.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 33 insertions, 1 deletions

diff --git a/drivers/net/phy/vitesse.c b/drivers/net/phy/vitesse.c
index 2e37eb337d48..24b4a09468dd 100644
--- a/drivers/net/phy/vitesse.c
+++ b/drivers/net/phy/vitesse.c
@@ -62,6 +62,10 @@
 /* Vitesse Extended Page Access Register */
 #define MII_VSC82X4_EXT_PAGE_ACCESS     0x1f
 
+/* Vitesse VSC8601 Extended PHY Control Register 1 */
+#define MII_VSC8601_EPHY_CTL            0x17
+#define MII_VSC8601_EPHY_CTL_RGMII_SKEW (1 << 8)
+
 #define PHY_ID_VSC8234                  0x000fc620
 #define PHY_ID_VSC8244                  0x000fc6c0
 #define PHY_ID_VSC8514                  0x00070670
@@ -111,6 +115,34 @@ static int vsc824x_config_init(struct phy_device *phydev)
         return err;
 }
 
+/* This adds a skew for both TX and RX clocks, so the skew should only be
+ * applied to "rgmii-id" interfaces. It may not work as expected
+ * on "rgmii-txid", "rgmii-rxid" or "rgmii" interfaces. */
+static int vsc8601_add_skew(struct phy_device *phydev)
+{
+        int ret;
+
+        ret = phy_read(phydev, MII_VSC8601_EPHY_CTL);
+        if (ret < 0)
+                return ret;
+
+        ret |= MII_VSC8601_EPHY_CTL_RGMII_SKEW;
+        return phy_write(phydev, MII_VSC8601_EPHY_CTL, ret);
+}
+
+static int vsc8601_config_init(struct phy_device *phydev)
+{
+        int ret = 0;
+
+        if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
+                ret = vsc8601_add_skew(phydev);
+
+        if (ret < 0)
+                return ret;
+
+        return genphy_config_init(phydev);
+}
+
 static int vsc824x_ack_interrupt(struct phy_device *phydev)
 {
         int err = 0;
@@ -275,7 +307,7 @@ static struct phy_driver vsc82xx_driver[] = {
         .phy_id_mask    = 0x000ffff0,
         .features       = PHY_GBIT_FEATURES,
         .flags          = PHY_HAS_INTERRUPT,
-        .config_init    = &genphy_config_init,
+        .config_init    = &vsc8601_config_init,
         .config_aneg    = &genphy_config_aneg,
         .read_status    = &genphy_read_status,
         .ack_interrupt  = &vsc824x_ack_interrupt,