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    Subject[PATCH 5.10 440/530] i2c: rcar: make sure irq is not threaded on Gen2 and earlier
    Date
    From: Wolfram Sang <wsa+renesas@sang-engineering.com>

    [ Upstream commit 24c6d4bc563881539d2cd4433e502436ad87d512 ]

    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>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/i2c/busses/i2c-rcar.c | 6 +++++-
    1 file changed, 5 insertions(+), 1 deletion(-)

    diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
    index ad6630e3cc77..3c9c3a6f7ac8 100644
    --- 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;
    --
    2.30.2


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