netdev - [RFC PATCH net-next] net: dsa: mt7530: fix port specifications for MT7988

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Date:   Thu,  6 Apr 2023 13:04:45 +0300
From:   arinc9.unal@...il.com
To:     Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Daniel Golle <daniel@...rotopia.org>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     Arınç ÜNAL <arinc.unal@...nc9.com>,
        erkin.bozoglu@...ont.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: [RFC PATCH net-next] net: dsa: mt7530: fix port specifications for MT7988

From: Arınç ÜNAL <arinc.unal@...nc9.com>

On the switch on the MT7988 SoC, there are only 4 PHYs. There's only port 6
as the CPU port, there's no port 5. Split the switch statement with a check
to enforce these for the switch on the MT7988 SoC. The internal phy-mode is
specific to MT7988 so put it for MT7988 only.

Signed-off-by: Arınç ÜNAL <arinc.unal@...nc9.com>
---

Daniel, this is based on the information you provided me about the switch.
I will add this to my current patch series if it looks good to you.

Arınç

---
 drivers/net/dsa/mt7530.c | 67 ++++++++++++++++++++++++++--------------
 1 file changed, 43 insertions(+), 24 deletions(-)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 6fbbdcb5987f..f167fa135ef1 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -2548,7 +2548,7 @@ static void mt7988_mac_port_get_caps(struct dsa_switch *ds, int port,
 	phy_interface_zero(config->supported_interfaces);
 
 	switch (port) {
-	case 0 ... 4: /* Internal phy */
+	case 0 ... 3: /* Internal phy */
 		__set_bit(PHY_INTERFACE_MODE_INTERNAL,
 			  config->supported_interfaces);
 		break;
@@ -2710,37 +2710,56 @@ mt753x_phylink_mac_config(struct dsa_switch *ds, int port, unsigned int mode,
 	struct mt7530_priv *priv = ds->priv;
 	u32 mcr_cur, mcr_new;
 
-	switch (port) {
-	case 0 ... 4: /* Internal phy */
-		if (state->interface != PHY_INTERFACE_MODE_GMII &&
-		    state->interface != PHY_INTERFACE_MODE_INTERNAL)
-			goto unsupported;
-		break;
-	case 5: /* Port 5, a CPU port. */
-		if (priv->p5_interface == state->interface)
+	if (priv->id == ID_MT7988) {
+		switch (port) {
+		case 0 ... 3: /* Internal phy */
+			if (state->interface != PHY_INTERFACE_MODE_INTERNAL)
+				goto unsupported;
 			break;
+		case 6: /* Port 6, a CPU port. */
+			if (priv->p6_interface == state->interface)
+				break;
 
-		if (mt753x_mac_config(ds, port, mode, state) < 0)
+			if (mt753x_mac_config(ds, port, mode, state) < 0)
+				goto unsupported;
+
+			priv->p6_interface = state->interface;
+			break;
+		default:
 			goto unsupported;
+		}
+	} else {
+		switch (port) {
+		case 0 ... 4: /* Internal phy */
+			if (state->interface != PHY_INTERFACE_MODE_GMII)
+				goto unsupported;
+			break;
+		case 5: /* Port 5, a CPU port. */
+			if (priv->p5_interface == state->interface)
+				break;
 
-		if (priv->p5_intf_sel == P5_INTF_SEL_GMAC5 ||
-		    priv->p5_intf_sel == P5_INTF_SEL_GMAC5_SGMII)
-			priv->p5_interface = state->interface;
-		break;
-	case 6: /* Port 6, a CPU port. */
-		if (priv->p6_interface == state->interface)
+			if (mt753x_mac_config(ds, port, mode, state) < 0)
+				goto unsupported;
+
+			if (priv->p5_intf_sel == P5_INTF_SEL_GMAC5 ||
+			priv->p5_intf_sel == P5_INTF_SEL_GMAC5_SGMII)
+				priv->p5_interface = state->interface;
 			break;
+		case 6: /* Port 6, a CPU port. */
+			if (priv->p6_interface == state->interface)
+				break;
 
-		if (mt753x_mac_config(ds, port, mode, state) < 0)
-			goto unsupported;
+			if (mt753x_mac_config(ds, port, mode, state) < 0)
+				goto unsupported;
 
-		priv->p6_interface = state->interface;
-		break;
-	default:
+			priv->p6_interface = state->interface;
+			break;
+		default:
 unsupported:
-		dev_err(ds->dev, "%s: unsupported %s port: %i\n",
-			__func__, phy_modes(state->interface), port);
-		return;
+			dev_err(ds->dev, "%s: unsupported %s port: %i\n",
+				__func__, phy_modes(state->interface), port);
+			return;
+		}
 	}
 
 	mcr_cur = mt7530_read(priv, MT7530_PMCR_P(port));
-- 
2.37.2