linux-kernel - [RFC PATCH net-next 04/12] net: dsa: mt7530: set priv->p5

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Date:   Wed,  5 Apr 2023 23:38:51 +0300
From:   arinc9.unal@...il.com
To:     René van Dorst <opensource@...rst.com>,
        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>,
        Russell King <linux@...linux.org.uk>
Cc:     Arınç ÜNAL <arinc.unal@...nc9.com>,
        Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>,
        Richard van Schagen <richard@...terhints.com>,
        Richard van Schagen <vschagen@...com>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        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 04/12] net: dsa: mt7530: set priv->p5_interface in correct conditions

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

Currently, priv->p5_interface is set on mt7530_setup_port5() even though
it's being set on mt753x_phylink_mac_config() after mt7530_setup_port5() is
run.

The only case for setting priv->p5_interface on mt7530_setup_port5() is
when PHY muxing is enabled. That is because port 5 is not defined as a port
on the devicetree, therefore, it cannot be controlled by phylink.

To address this, set priv->p5_interface only if PHY muxing is enabled.

On mt753x_phylink_mac_config, != P5_DISABLED is enough but to be explicit,
look for p5_intf_sel being P5_INTF_SEL_GMAC5 or P5_INTF_SEL_GMAC5_SGMII.

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

If you think priv->p5_interface should not be set when port 5 is used for
PHY muxing, let me know.

Arınç

---
 drivers/net/dsa/mt7530.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 9ab2e128b564..fccd59564532 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -976,7 +976,9 @@ static void mt7530_setup_port5(struct dsa_switch *ds, phy_interface_t interface)
 	dev_dbg(ds->dev, "Setup P5, HWTRAP=0x%x, intf_sel=%s, phy-mode=%s\n",
 		val, p5_intf_modes(priv->p5_intf_sel), phy_modes(interface));
 
-	priv->p5_interface = interface;
+	if (priv->p5_intf_sel == P5_INTF_SEL_PHY_P0 ||
+	    priv->p5_intf_sel == P5_INTF_SEL_PHY_P4)
+		priv->p5_interface = interface;
 
 unlock_exit:
 	mutex_unlock(&priv->reg_mutex);
@@ -2746,7 +2748,8 @@ mt753x_phylink_mac_config(struct dsa_switch *ds, int port, unsigned int mode,
 		if (mt753x_mac_config(ds, port, mode, state) < 0)
 			goto unsupported;
 
-		if (priv->p5_intf_sel != P5_DISABLED)
+		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. */
-- 
2.37.2