linux-kernel - [PATCH 5.11 500/601] i2c: rcar: make sure irq is not threaded on Gen2 and earlier

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Date:   Wed, 12 May 2021 16:49:37 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        Wolfram Sang <wsa@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.11 500/601] i2c: rcar: make sure irq is not threaded on Gen2 and earlier

From: Wolfram Sang <wsa+renesas@...g-engineering.com>

[ Upstream commit 24c6d4bc563881539d2cd4433e502436ad87d512 ]

Ensure this irq runs as fast as possible.

Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
Signed-off-by: Wolfram Sang <wsa@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.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