linux-kernel - [RFC PATCH net-next v5 03/25] net: dsa: qca8k: improve qca8k read/write/rmw bus access

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Message-Id: <20210511020500.17269-4-ansuelsmth@gmail.com>
Date:   Tue, 11 May 2021 04:04:38 +0200
From:   Ansuel Smith <ansuelsmth@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        netdev@...r.kernel.org (open list:NETWORKING DRIVERS),
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS), linux-kernel@...r.kernel.org (open list)
Cc:     Ansuel Smith <ansuelsmth@...il.com>
Subject: [RFC PATCH net-next v5 03/25] net: dsa: qca8k: improve qca8k read/write/rmw bus access

Put bus in local variable to improve faster access to the mdio bus.

Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
---
 drivers/net/dsa/qca8k.c | 29 ++++++++++++++++-------------
 1 file changed, 16 insertions(+), 13 deletions(-)

diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
index 25fa7084e820..3c882d325fdf 100644
--- a/drivers/net/dsa/qca8k.c
+++ b/drivers/net/dsa/qca8k.c
@@ -142,17 +142,18 @@ qca8k_set_page(struct mii_bus *bus, u16 page)
 static u32
 qca8k_read(struct qca8k_priv *priv, u32 reg)
 {
+	struct mii_bus *bus = priv->bus;
 	u16 r1, r2, page;
 	u32 val;
 
 	qca8k_split_addr(reg, &r1, &r2, &page);
 
-	mutex_lock_nested(&priv->bus->mdio_lock, MDIO_MUTEX_NESTED);
+	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
 
-	qca8k_set_page(priv->bus, page);
-	val = qca8k_mii_read32(priv->bus, 0x10 | r2, r1);
+	qca8k_set_page(bus, page);
+	val = qca8k_mii_read32(bus, 0x10 | r2, r1);
 
-	mutex_unlock(&priv->bus->mdio_lock);
+	mutex_unlock(&bus->mdio_lock);
 
 	return val;
 }
@@ -160,35 +161,37 @@ qca8k_read(struct qca8k_priv *priv, u32 reg)
 static void
 qca8k_write(struct qca8k_priv *priv, u32 reg, u32 val)
 {
+	struct mii_bus *bus = priv->bus;
 	u16 r1, r2, page;
 
 	qca8k_split_addr(reg, &r1, &r2, &page);
 
-	mutex_lock_nested(&priv->bus->mdio_lock, MDIO_MUTEX_NESTED);
+	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
 
-	qca8k_set_page(priv->bus, page);
-	qca8k_mii_write32(priv->bus, 0x10 | r2, r1, val);
+	qca8k_set_page(bus, page);
+	qca8k_mii_write32(bus, 0x10 | r2, r1, val);
 
-	mutex_unlock(&priv->bus->mdio_lock);
+	mutex_unlock(&bus->mdio_lock);
 }
 
 static u32
 qca8k_rmw(struct qca8k_priv *priv, u32 reg, u32 mask, u32 val)
 {
+	struct mii_bus *bus = priv->bus;
 	u16 r1, r2, page;
 	u32 ret;
 
 	qca8k_split_addr(reg, &r1, &r2, &page);
 
-	mutex_lock_nested(&priv->bus->mdio_lock, MDIO_MUTEX_NESTED);
+	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
 
-	qca8k_set_page(priv->bus, page);
-	ret = qca8k_mii_read32(priv->bus, 0x10 | r2, r1);
+	qca8k_set_page(bus, page);
+	ret = qca8k_mii_read32(bus, 0x10 | r2, r1);
 	ret &= ~mask;
 	ret |= val;
-	qca8k_mii_write32(priv->bus, 0x10 | r2, r1, ret);
+	qca8k_mii_write32(bus, 0x10 | r2, r1, ret);
 
-	mutex_unlock(&priv->bus->mdio_lock);
+	mutex_unlock(&bus->mdio_lock);
 
 	return ret;
 }
-- 
2.30.2