linux-kernel - [PATCH v8 2/3] i2c: tegra: add separate function for config

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Message-ID: <1464356224-10339-2-git-send-email-smohammed@nvidia.com>
Date:	Fri, 27 May 2016 19:07:03 +0530
From:	Shardar Shariff Md <smohammed@...dia.com>
To:	<ldewangan@...dia.com>, <wsa@...-dreams.de>,
	<swarren@...dotorg.org>, <thierry.reding@...il.com>,
	<gnurou@...il.com>, <linux-i2c@...r.kernel.org>,
	<linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:	<smohammed@...dia.com>
Subject: [PATCH v8 2/3] i2c: tegra: add separate function for config_load programing

Define separate function for configuration load register handling
to make it use by different functions later.

Signed-off-by: Shardar Shariff Md <smohammed@...dia.com>

---
Changes in v2:
- Remove unnecessary paranthesis and align to 80 characters per line

Changes in v3:
- Add separate function for config load handling

Changes in v4:
- Move timeout calculation to separate patch
---
 drivers/i2c/busses/i2c-tegra.c | 40 +++++++++++++++++++++++++---------------
 1 file changed, 25 insertions(+), 15 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 7cbeb4e..4e30f86 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -426,6 +426,28 @@ static inline void tegra_i2c_clock_disable(struct tegra_i2c_dev *i2c_dev)
 		clk_disable(i2c_dev->fast_clk);
 }
 
+static int tegra_i2c_wait_for_config_load(struct tegra_i2c_dev *i2c_dev)
+{
+	unsigned long reg_offset;
+	u32 val;
+	int err;
+
+	if (i2c_dev->hw->has_config_load_reg) {
+		reg_offset = tegra_i2c_reg_addr(i2c_dev, I2C_CONFIG_LOAD);
+		i2c_writel(i2c_dev, I2C_MSTR_CONFIG_LOAD, I2C_CONFIG_LOAD);
+		err = readx_poll_timeout(readl, i2c_dev->base + reg_offset,
+					 val, val == 0, 1000,
+					 I2C_CONFIG_LOAD_TIMEOUT);
+		if (err) {
+			dev_warn(i2c_dev->dev,
+				 "timeout waiting for config load\n");
+			return err;
+		}
+	}
+
+	return 0;
+}
+
 static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev)
 {
 	u32 val;
@@ -479,21 +501,9 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev)
 	if (i2c_dev->is_multimaster_mode && i2c_dev->hw->has_slcg_override_reg)
 		i2c_writel(i2c_dev, I2C_MST_CORE_CLKEN_OVR, I2C_CLKEN_OVERRIDE);
 
-	if (i2c_dev->hw->has_config_load_reg) {
-		u32 val;
-		unsigned long reg_offset;
-
-		reg_offset = tegra_i2c_reg_addr(i2c_dev, I2C_CONFIG_LOAD);
-		i2c_writel(i2c_dev, I2C_MSTR_CONFIG_LOAD, I2C_CONFIG_LOAD);
-		err = readx_poll_timeout(readl, i2c_dev->base + reg_offset,
-					 val, val == 0, 1000,
-					 I2C_CONFIG_LOAD_TIMEOUT);
-		if (err) {
-			dev_warn(i2c_dev->dev,
-				 "timeout waiting for config load\n");
-			goto err;
-		}
-	}
+	err = tegra_i2c_wait_for_config_load(i2c_dev);
+	if (err)
+		goto err;
 
 	if (i2c_dev->irq_disabled) {
 		i2c_dev->irq_disabled = 0;
-- 
1.8.1.5