linux-kernel - [PATCH net-next 14/30] net: dsa: mt7530: switch to if/else statements on mt7530_setup

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230522121532.86610-15-arinc.unal@arinc9.com>
Date:   Mon, 22 May 2023 15:15:16 +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>,
        Russell King <linux@...linux.org.uk>
Cc:     Arınç ÜNAL <arinc.unal@...nc9.com>,
        Richard van Schagen <richard@...terhints.com>,
        Richard van Schagen <vschagen@...com>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Bartel Eerdekens <bartel.eerdekens@...stell8.be>,
        erkin.bozoglu@...ont.com, mithat.guner@...ont.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH net-next 14/30] net: dsa: mt7530: switch to if/else statements on mt7530_setup_port6()

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

This code is from before this driver was converted to phylink API. Phylink
deals with the unsupported interface cases before mt7530_setup_port6() is
run. Therefore, the default case would never run. However, it must be
defined nonetheless to handle all the remaining enumeration values, the
phy-modes.

Switch to if/else statements which simplifies the code.

Change mt7530_setup_port6() to void now that there're no error cases left.

Tested-by: Arınç ÜNAL <arinc.unal@...nc9.com>
Signed-off-by: Arınç ÜNAL <arinc.unal@...nc9.com>
---
 drivers/net/dsa/mt7530.c | 35 +++++++++++------------------------
 1 file changed, 11 insertions(+), 24 deletions(-)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 47b89193d4cc..744787e38ecc 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -400,26 +400,28 @@ static void mt7530_pll_setup(struct mt7530_priv *priv)
 }
 
 /* Setup port 6 interface mode and TRGMII TX circuit */
-static int
+static void
 mt7530_setup_port6(struct dsa_switch *ds, phy_interface_t interface)
 {
 	struct mt7530_priv *priv = ds->priv;
-	u32 ncpo1, ssc_delta, trgint, xtal;
+	u32 ncpo1, ssc_delta, xtal;
 
 	mt7530_clear(priv, MT7530_MHWTRAP, MHWTRAP_P6_DIS);
 
 	xtal = mt7530_read(priv, MT7530_HWTRAP) & HWTRAP_XTAL_MASK;
 
-	switch (interface) {
-	case PHY_INTERFACE_MODE_RGMII:
-		trgint = 0;
-		break;
-	case PHY_INTERFACE_MODE_TRGMII:
-		trgint = 1;
+	if (interface == PHY_INTERFACE_MODE_RGMII) {
+		mt7530_rmw(priv, MT7530_P6ECR, P6_INTF_MODE_MASK,
+			   P6_INTF_MODE(0));
+	} else {
+		mt7530_rmw(priv, MT7530_P6ECR, P6_INTF_MODE_MASK,
+			   P6_INTF_MODE(1));
+
 		if (xtal == HWTRAP_XTAL_25MHZ)
 			ssc_delta = 0x57;
 		else
 			ssc_delta = 0x87;
+
 		if (priv->id == ID_MT7621) {
 			/* PLL frequency: 125MHz: 1.0GBit */
 			if (xtal == HWTRAP_XTAL_40MHZ)
@@ -432,17 +434,7 @@ mt7530_setup_port6(struct dsa_switch *ds, phy_interface_t interface)
 			if (xtal == HWTRAP_XTAL_25MHZ)
 				ncpo1 = 0x1400;
 		}
-		break;
-	default:
-		dev_err(priv->dev, "xMII interface %d not supported\n",
-			interface);
-		return -EINVAL;
-	}
 
-	mt7530_rmw(priv, MT7530_P6ECR, P6_INTF_MODE_MASK,
-		   P6_INTF_MODE(trgint));
-
-	if (trgint) {
 		/* Disable the MT7530 TRGMII clocks */
 		core_clear(priv, CORE_TRGMII_GSW_CLK_CG, REG_TRGMIICK_EN);
 
@@ -464,8 +456,6 @@ mt7530_setup_port6(struct dsa_switch *ds, phy_interface_t interface)
 		/* Enable the MT7530 TRGMII clocks */
 		core_set(priv, CORE_TRGMII_GSW_CLK_CG, REG_TRGMIICK_EN);
 	}
-
-	return 0;
 }
 
 static void
@@ -2563,14 +2553,11 @@ mt7530_mac_config(struct dsa_switch *ds, int port, unsigned int mode,
 		  phy_interface_t interface)
 {
 	struct mt7530_priv *priv = ds->priv;
-	int ret;
 
 	if (port == 5) {
 		mt7530_setup_port5(priv->ds, interface);
 	} else if (port == 6) {
-		ret = mt7530_setup_port6(priv->ds, interface);
-		if (ret)
-			return ret;
+		mt7530_setup_port6(priv->ds, interface);
 	}
 
 	return 0;
-- 
2.39.2