i2c: tegra: Factor out register polling into separate function

Factor out register polling into a separate function in order to remove
boilerplate code and make code cleaner.
Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/busses/i2c-tegra.c

@@ -514,10 +514,24 @@ static void tegra_i2c_vi_init(struct tegra_i2c_dev *i2c_dev)
 	i2c_writel(i2c_dev, 0x0, I2C_TLOW_SEXT);
 }
 
+static int tegra_i2c_poll_register(struct tegra_i2c_dev *i2c_dev,
+				   u32 reg, u32 mask, u32 delay_us,
+				   u32 timeout_us)
+{
+	void __iomem *addr = i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg);
+	u32 val;
+
+	if (!i2c_dev->is_curr_atomic_xfer)
+		return readl_relaxed_poll_timeout(addr, val, !(val & mask),
+						  delay_us, timeout_us);
+
+	return readl_relaxed_poll_timeout_atomic(addr, val, !(val & mask),
+						 delay_us, timeout_us);
+}
+
 static int tegra_i2c_flush_fifos(struct tegra_i2c_dev *i2c_dev)
 {
-	u32 mask, val, offset, reg_offset;
-	void __iomem *addr;
+	u32 mask, val, offset;
 	int err;
 
 	if (i2c_dev->hw->has_mst_fifo) {
@@ -534,16 +548,7 @@ static int tegra_i2c_flush_fifos(struct tegra_i2c_dev *i2c_dev)
 	val |= mask;
 	i2c_writel(i2c_dev, val, offset);
 
-	reg_offset = tegra_i2c_reg_addr(i2c_dev, offset);
-	addr = i2c_dev->base + reg_offset;
-
-	if (i2c_dev->is_curr_atomic_xfer)
-		err = readl_relaxed_poll_timeout_atomic(addr, val, !(val & mask),
-							1000, 1000000);
-	else
-		err = readl_relaxed_poll_timeout(addr, val, !(val & mask),
-						 1000, 1000000);
-
+	err = tegra_i2c_poll_register(i2c_dev, offset, mask, 1000, 1000000);
 	if (err) {
 		dev_err(i2c_dev->dev, "failed to flush FIFO\n");
 		return err;
@@ -553,30 +558,18 @@ static int tegra_i2c_flush_fifos(struct tegra_i2c_dev *i2c_dev)
 
 static int tegra_i2c_wait_for_config_load(struct tegra_i2c_dev *i2c_dev)
 {
-	unsigned long reg_offset;
-	void __iomem *addr;
-	u32 val;
 	int err;
 
-	if (i2c_dev->hw->has_config_load_reg) {
-		reg_offset = tegra_i2c_reg_addr(i2c_dev, I2C_CONFIG_LOAD);
-		addr = i2c_dev->base + reg_offset;
-		i2c_writel(i2c_dev, I2C_MSTR_CONFIG_LOAD, I2C_CONFIG_LOAD);
+	if (!i2c_dev->hw->has_config_load_reg)
+		return 0;
 
-		if (i2c_dev->is_curr_atomic_xfer)
-			err = readl_relaxed_poll_timeout_atomic(
-						addr, val, val == 0, 1000,
-						I2C_CONFIG_LOAD_TIMEOUT);
-		else
-			err = readl_relaxed_poll_timeout(
-						addr, val, val == 0, 1000,
-						I2C_CONFIG_LOAD_TIMEOUT);
+	i2c_writel(i2c_dev, I2C_MSTR_CONFIG_LOAD, I2C_CONFIG_LOAD);
 
-		if (err) {
-			dev_warn(i2c_dev->dev,
-				 "timeout waiting for config load\n");
-			return err;
-		}
+	err = tegra_i2c_poll_register(i2c_dev, I2C_CONFIG_LOAD, 0xffffffff,
+				      1000, I2C_CONFIG_LOAD_TIMEOUT);
+	if (err) {
+		dev_warn(i2c_dev->dev, "timeout waiting for config load\n");
+		return err;
 	}
 
 	return 0;