i2c: rcar: make sure irq is not threaded on Gen2 and earlier

Ensure this irq runs as fast as possible.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index ad6630e3cc7790d17204c3b529653789c67fccfa..3c9c3a6f7ac868fad62c268f8d7d6b4cadf8aa2f 100644 (file)
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -928,6 +928,7 @@ static int rcar_i2c_probe(struct platform_device *pdev)
        struct rcar_i2c_priv *priv;
        struct i2c_adapter *adap;
        struct device *dev = &pdev->dev;
+       unsigned long irqflags = 0;
        int ret;
 
        /* Otherwise logic will break because some bytes must always use PIO */
@@ -976,6 +977,9 @@ static int rcar_i2c_probe(struct platform_device *pdev)
 
        rcar_i2c_write(priv, ICSAR, 0); /* Gen2: must be 0 if not using slave */
 
+       if (priv->devtype < I2C_RCAR_GEN3)
+               irqflags |= IRQF_NO_THREAD;
+
        if (priv->devtype == I2C_RCAR_GEN3) {
                priv->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
                if (!IS_ERR(priv->rstc)) {
@@ -995,7 +999,7 @@ static int rcar_i2c_probe(struct platform_device *pdev)
                priv->flags |= ID_P_HOST_NOTIFY;
 
        priv->irq = platform_get_irq(pdev, 0);
-       ret = devm_request_irq(dev, priv->irq, rcar_i2c_irq, 0, dev_name(dev), priv);
+       ret = devm_request_irq(dev, priv->irq, rcar_i2c_irq, irqflags, dev_name(dev), priv);
        if (ret < 0) {
                dev_err(dev, "cannot get irq %d\n", priv->irq);
                goto out_pm_disable;