linux-kernel - [PATCH 2/3] phy: ti: am654: simplify return handling

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Date:   Sun, 26 Jul 2020 00:34:54 +0530
From:   Sekhar Nori <nsekhar@...com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, Sekhar Nori <nsekhar@...com>
Subject: [PATCH 2/3] phy: ti: am654: simplify return handling

Checking return value after each regfield write becomes
hard to read quickly as number of writes increase.

Simplify by checking for error only once.

Signed-off-by: Sekhar Nori <nsekhar@...com>
---
 drivers/phy/ti/phy-am654-serdes.c | 48 +++++++++++++------------------
 1 file changed, 20 insertions(+), 28 deletions(-)

diff --git a/drivers/phy/ti/phy-am654-serdes.c b/drivers/phy/ti/phy-am654-serdes.c
index ed7669c6a7a0..f3d58853553d 100644
--- a/drivers/phy/ti/phy-am654-serdes.c
+++ b/drivers/phy/ti/phy-am654-serdes.c
@@ -163,34 +163,32 @@ static void serdes_am654_disable_pll(struct serdes_am654 *phy)
 
 static int serdes_am654_enable_txrx(struct serdes_am654 *phy)
 {
-	int ret;
+	int ret = 0;
 
 	/* Enable TX */
-	ret = regmap_field_write(phy->fields[TX0_ENABLE], TX0_ENABLE_STATE);
-	if (ret)
-		return ret;
+	ret |= regmap_field_write(phy->fields[TX0_ENABLE], TX0_ENABLE_STATE);
 
 	/* Enable RX */
-	ret = regmap_field_write(phy->fields[RX0_ENABLE], RX0_ENABLE_STATE);
+	ret |= regmap_field_write(phy->fields[RX0_ENABLE], RX0_ENABLE_STATE);
+
 	if (ret)
-		return ret;
+		return -EIO;
 
 	return 0;
 }
 
 static int serdes_am654_disable_txrx(struct serdes_am654 *phy)
 {
-	int ret;
+	int ret = 0;
 
 	/* Disable TX */
-	ret = regmap_field_write(phy->fields[TX0_ENABLE], TX0_DISABLE_STATE);
-	if (ret)
-		return ret;
+	ret |= regmap_field_write(phy->fields[TX0_ENABLE], TX0_DISABLE_STATE);
 
 	/* Disable RX */
-	ret = regmap_field_write(phy->fields[RX0_ENABLE], RX0_DISABLE_STATE);
+	ret |= regmap_field_write(phy->fields[RX0_ENABLE], RX0_DISABLE_STATE);
+
 	if (ret)
-		return ret;
+		return -EIO;
 
 	return 0;
 }
@@ -313,19 +311,14 @@ static int serdes_am654_usb3_init(struct serdes_am654 *phy)
 
 static int serdes_am654_pcie_init(struct serdes_am654 *phy)
 {
-	int ret;
+	int ret = 0;
 
-	ret = regmap_field_write(phy->fields[CONFIG_VERSION], VERSION_VAL);
-	if (ret)
-		return ret;
+	ret |= regmap_field_write(phy->fields[CONFIG_VERSION], VERSION_VAL);
+	ret |= regmap_field_write(phy->fields[CMU_MASTER_CDN], 0x1);
+	ret |= regmap_field_write(phy->fields[L1_MASTER_CDN], 0x1);
 
-	ret = regmap_field_write(phy->fields[CMU_MASTER_CDN], 0x1);
 	if (ret)
-		return ret;
-
-	ret = regmap_field_write(phy->fields[L1_MASTER_CDN], 0x1);
-	if (ret)
-		return ret;
+		return -EIO;
 
 	return 0;
 }
@@ -347,20 +340,19 @@ static int serdes_am654_init(struct phy *x)
 static int serdes_am654_reset(struct phy *x)
 {
 	struct serdes_am654 *phy = phy_get_drvdata(x);
-	int ret;
+	int ret = 0;
 
 	serdes_am654_disable_pll(phy);
 	serdes_am654_disable_txrx(phy);
 
-	ret = regmap_field_write(phy->fields[POR_EN], 0x1);
-	if (ret)
-		return ret;
+	ret |= regmap_field_write(phy->fields[POR_EN], 0x1);
 
 	mdelay(1);
 
-	ret = regmap_field_write(phy->fields[POR_EN], 0x0);
+	ret |= regmap_field_write(phy->fields[POR_EN], 0x0);
+
 	if (ret)
-		return ret;
+		return -EIO;
 
 	return 0;
 }
-- 
2.17.1