linux-kernel - [PATCH v1] i2c: tegra: Use threaded interrupt

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Message-Id: <20210112131709.1711-1-digetx@gmail.com>
Date:   Tue, 12 Jan 2021 16:17:09 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Mikko Perttunen <cyndis@...si.fi>
Cc:     linux-i2c@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1] i2c: tegra: Use threaded interrupt

Switch to use threaded interrupt context in order to avoid checking of
"are we in interrupt?" for the code that may sleep in the IRQ handler.
I2C doesn't require a very low interrupt-handling latency, hence this
change doesn't introduce any noticeable effects.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/i2c/busses/i2c-tegra.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 0727383f4940..c4262408bae7 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -533,7 +533,7 @@ static int tegra_i2c_poll_register(struct tegra_i2c_dev *i2c_dev,
 	void __iomem *addr = i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg);
 	u32 val;
 
-	if (!i2c_dev->atomic_mode && !in_irq())
+	if (!i2c_dev->atomic_mode)
 		return readl_relaxed_poll_timeout(addr, val, !(val & mask),
 						  delay_us, timeout_us);
 
@@ -1719,9 +1719,10 @@ static int tegra_i2c_probe(struct platform_device *pdev)
 	/* interrupt will be enabled during of transfer time */
 	irq_set_status_flags(i2c_dev->irq, IRQ_NOAUTOEN);
 
-	err = devm_request_irq(i2c_dev->dev, i2c_dev->irq, tegra_i2c_isr,
-			       IRQF_NO_SUSPEND, dev_name(i2c_dev->dev),
-			       i2c_dev);
+	err = devm_request_threaded_irq(i2c_dev->dev, i2c_dev->irq,
+					NULL, tegra_i2c_isr,
+					IRQF_NO_SUSPEND | IRQF_ONESHOT,
+					dev_name(i2c_dev->dev), i2c_dev);
 	if (err)
 		return err;
 
-- 
2.29.2