i2c: imx: avoid taking clk_prepare mutex in PM callbacks

This is unsafe, as the runtime PM callbacks are called from the PM
workqueue, so this may deadlock when handling an i2c attached clock,
which may already hold the clk_prepare mutex from another context.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/busses/i2c-imx.c

@@ -1226,7 +1226,7 @@ static int i2c_imx_runtime_suspend(struct device *dev)
 {
 	struct imx_i2c_struct *i2c_imx = dev_get_drvdata(dev);
 
-	clk_disable_unprepare(i2c_imx->clk);
+	clk_disable(i2c_imx->clk);
 
 	return 0;
 }
@@ -1236,7 +1236,7 @@ static int i2c_imx_runtime_resume(struct device *dev)
 	struct imx_i2c_struct *i2c_imx = dev_get_drvdata(dev);
 	int ret;
 
-	ret = clk_prepare_enable(i2c_imx->clk);
+	ret = clk_enable(i2c_imx->clk);
 	if (ret)
 		dev_err(dev, "can't enable I2C clock, ret=%d\n", ret);