drivers: net: cpsw-phy-sel: add dev_warn() for unsupported PHY mode

The cpsw-phy-sel driver supports only MII, RMII, and RGMII PHY modes,
and silently handled any other values as if MII was specified. In a
case where the PHY mode was incorrectly specified, or a bug elsewhere,
there would be no indication of a problem. If MII was the correct mode,
then this will go unnoticed, otherwise the symptom will be a failure
to transmit/receive data over the RMII/RGMII link.

Add a dev_warn() to make this condition obvious and provide a
breadcrumb to follow.

Cc: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: David Rivshin <drivshin@allworx.com>
Acked-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/ti/cpsw-phy-sel.c b/drivers/net/ethernet/ti/cpsw-phy-sel.c
index e9cc61e1ec742090157db6b792b1a6a9168e6635..c3e85acfdc70233a628f939477b208e3dd28121b 100644 (file)
--- a/drivers/net/ethernet/ti/cpsw-phy-sel.c
+++ b/drivers/net/ethernet/ti/cpsw-phy-sel.c
@@ -63,8 +63,12 @@ static void cpsw_gmii_sel_am3352(struct cpsw_phy_sel_priv *priv,
                mode = AM33XX_GMII_SEL_MODE_RGMII;
                break;
 
-       case PHY_INTERFACE_MODE_MII:
        default:
+               dev_warn(priv->dev,
+                        "Unsupported PHY mode: \"%s\". Defaulting to MII.\n",
+                       phy_modes(phy_mode));
+               /* fallthrough */
+       case PHY_INTERFACE_MODE_MII:
                mode = AM33XX_GMII_SEL_MODE_MII;
                break;
        };
@@ -106,8 +110,12 @@ static void cpsw_gmii_sel_dra7xx(struct cpsw_phy_sel_priv *priv,
                mode = AM33XX_GMII_SEL_MODE_RGMII;
                break;
 
-       case PHY_INTERFACE_MODE_MII:
        default:
+               dev_warn(priv->dev,
+                        "Unsupported PHY mode: \"%s\". Defaulting to MII.\n",
+                       phy_modes(phy_mode));
+               /* fallthrough */
+       case PHY_INTERFACE_MODE_MII:
                mode = AM33XX_GMII_SEL_MODE_MII;
                break;
        };