netdev - [PATCH v2 2/3] net: stmmac: dwmac-rk: Check platform-specific ops

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Date:   Wed, 21 Apr 2021 17:34:08 -0300
From:   Ezequiel Garcia <ezequiel@...labora.com>
To:     netdev@...r.kernel.org, linux-rockchip@...ts.infradead.org
Cc:     Jose Abreu <joabreu@...opsys.com>,
        Heiko Stuebner <heiko@...ech.de>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Peter Geis <pgwipeout@...il.com>,
        Kever Yang <kever.yang@...k-chips.com>,
        David Wu <david.wu@...k-chips.com>, kernel@...labora.com,
        Ezequiel Garcia <ezequiel@...labora.com>
Subject: [PATCH v2 2/3] net: stmmac: dwmac-rk: Check platform-specific ops

From: David Wu <david.wu@...k-chips.com>

Add a check for non-null struct rk_gmac_ops for the
configured PHY interface mode, failing if unsupported.

Signed-off-by: David Wu <david.wu@...k-chips.com>
[Ezequiel: Refactor so it fails if unsupported]
Signed-off-by: Ezequiel Garcia <ezequiel@...labora.com>
---
 .../net/ethernet/stmicro/stmmac/dwmac-rk.c    | 31 +++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
index c432a9592489..d2637d83899e 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
@@ -1294,11 +1294,36 @@ static struct rk_priv_data *rk_gmac_setup(struct platform_device *pdev,
 	return bsp_priv;
 }
 
+static int rk_gmac_check_ops(struct rk_priv_data *bsp_priv)
+{
+	switch (bsp_priv->phy_iface) {
+	case PHY_INTERFACE_MODE_RGMII:
+	case PHY_INTERFACE_MODE_RGMII_ID:
+	case PHY_INTERFACE_MODE_RGMII_RXID:
+	case PHY_INTERFACE_MODE_RGMII_TXID:
+		if (!bsp_priv->ops->set_to_rgmii)
+			return -EINVAL;
+		break;
+	case PHY_INTERFACE_MODE_RMII:
+		if (!bsp_priv->ops->set_to_rmii)
+			return -EINVAL;
+		break;
+	default:
+		dev_err(&bsp_priv->pdev->dev,
+			"unsupported interface %d", bsp_priv->phy_iface);
+	}
+	return 0;
+}
+
 static int rk_gmac_powerup(struct rk_priv_data *bsp_priv)
 {
 	int ret;
 	struct device *dev = &bsp_priv->pdev->dev;
 
+	ret = rk_gmac_check_ops(bsp_priv);
+	if (ret)
+		return ret;
+
 	ret = gmac_clk_enable(bsp_priv, true);
 	if (ret)
 		return ret;
@@ -1369,10 +1394,12 @@ static void rk_fix_speed(void *priv, unsigned int speed)
 	case PHY_INTERFACE_MODE_RGMII_ID:
 	case PHY_INTERFACE_MODE_RGMII_RXID:
 	case PHY_INTERFACE_MODE_RGMII_TXID:
-		bsp_priv->ops->set_rgmii_speed(bsp_priv, speed);
+		if (bsp_priv->ops->set_rgmii_speed)
+			bsp_priv->ops->set_rgmii_speed(bsp_priv, speed);
 		break;
 	case PHY_INTERFACE_MODE_RMII:
-		bsp_priv->ops->set_rmii_speed(bsp_priv, speed);
+		if (bsp_priv->ops->set_rmii_speed)
+			bsp_priv->ops->set_rmii_speed(bsp_priv, speed);
 		break;
 	default:
 		dev_err(dev, "unsupported interface %d", bsp_priv->phy_iface);
-- 
2.30.0