linux-kernel - [PATCH v4 3/8] thermal: exynos: switch from workqueue-driven interrupt handling to threaded interrupts

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Message-ID: <20231025133027.524152-4-m.majewski2@samsung.com>
Date:   Wed, 25 Oct 2023 15:30:22 +0200
From:   Mateusz Majewski <m.majewski2@...sung.com>
To:     linux-pm@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Mateusz Majewski <m.majewski2@...sung.com>,
        Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Lukasz Luba <lukasz.luba@....com>
Subject: [PATCH v4 3/8] thermal: exynos: switch from workqueue-driven
 interrupt handling to threaded interrupts

The workqueue boilerplate is mostly one-to-one what the threaded
interrupts do.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Signed-off-by: Mateusz Majewski <m.majewski2@...sung.com>
---
v1 -> v2: devm_request_threaded_irq call formatting change.

 drivers/thermal/samsung/exynos_tmu.c | 29 +++++++++-------------------
 1 file changed, 9 insertions(+), 20 deletions(-)

diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
index 4ff32245d2a9..c144592d4584 100644
--- a/drivers/thermal/samsung/exynos_tmu.c
+++ b/drivers/thermal/samsung/exynos_tmu.c
@@ -142,7 +142,6 @@ enum soc_type {
  * @base_second: base address of the common registers of the TMU controller.
  * @irq: irq number of the TMU controller.
  * @soc: id of the SOC type.
- * @irq_work: pointer to the irq work structure.
  * @lock: lock to implement synchronization.
  * @clk: pointer to the clock structure.
  * @clk_sec: pointer to the clock structure for accessing the base_second.
@@ -175,7 +174,6 @@ struct exynos_tmu_data {
 	void __iomem *base_second;
 	int irq;
 	enum soc_type soc;
-	struct work_struct irq_work;
 	struct mutex lock;
 	struct clk *clk, *clk_sec, *sclk;
 	u32 cal_type;
@@ -763,10 +761,9 @@ static int exynos7_tmu_read(struct exynos_tmu_data *data)
 		EXYNOS7_TMU_TEMP_MASK;
 }
 
-static void exynos_tmu_work(struct work_struct *work)
+static irqreturn_t exynos_tmu_threaded_irq(int irq, void *id)
 {
-	struct exynos_tmu_data *data = container_of(work,
-			struct exynos_tmu_data, irq_work);
+	struct exynos_tmu_data *data = id;
 
 	thermal_zone_device_update(data->tzd, THERMAL_EVENT_UNSPECIFIED);
 
@@ -778,7 +775,8 @@ static void exynos_tmu_work(struct work_struct *work)
 
 	clk_disable(data->clk);
 	mutex_unlock(&data->lock);
-	enable_irq(data->irq);
+
+	return IRQ_HANDLED;
 }
 
 static void exynos4210_tmu_clear_irqs(struct exynos_tmu_data *data)
@@ -812,16 +810,6 @@ static void exynos4210_tmu_clear_irqs(struct exynos_tmu_data *data)
 	writel(val_irq, data->base + tmu_intclear);
 }
 
-static irqreturn_t exynos_tmu_irq(int irq, void *id)
-{
-	struct exynos_tmu_data *data = id;
-
-	disable_irq_nosync(irq);
-	schedule_work(&data->irq_work);
-
-	return IRQ_HANDLED;
-}
-
 static const struct of_device_id exynos_tmu_match[] = {
 	{
 		.compatible = "samsung,exynos3250-tmu",
@@ -1023,8 +1011,6 @@ static int exynos_tmu_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_sensor;
 
-	INIT_WORK(&data->irq_work, exynos_tmu_work);
-
 	data->clk = devm_clk_get(&pdev->dev, "tmu_apbif");
 	if (IS_ERR(data->clk)) {
 		dev_err(&pdev->dev, "Failed to get clock\n");
@@ -1093,8 +1079,11 @@ static int exynos_tmu_probe(struct platform_device *pdev)
 		goto err_sclk;
 	}
 
-	ret = devm_request_irq(&pdev->dev, data->irq, exynos_tmu_irq,
-		IRQF_TRIGGER_RISING | IRQF_SHARED, dev_name(&pdev->dev), data);
+	ret = devm_request_threaded_irq(&pdev->dev, data->irq, NULL,
+					exynos_tmu_threaded_irq,
+					IRQF_TRIGGER_RISING
+						| IRQF_SHARED | IRQF_ONESHOT,
+					dev_name(&pdev->dev), data);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to request irq: %d\n", data->irq);
 		goto err_sclk;
-- 
2.42.0