linux-kernel - RE: [PATCH 04/11] i2c: imx-lpi2c: manage irq resource request/release in runtime pm

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Date:   Fri, 19 Mar 2021 04:53:56 +0000
From:   Aisheng Dong <aisheng.dong@....com>
To:     Clark Wang <xiaoning.wang@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>
CC:     "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "sumit.semwal@...aro.org" <sumit.semwal@...aro.org>,
        "christian.koenig@....com" <christian.koenig@....com>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 04/11] i2c: imx-lpi2c: manage irq resource request/release
 in runtime pm

> From: Clark Wang <xiaoning.wang@....com>
> Sent: Wednesday, March 17, 2021 2:54 PM
> 
> Manage irq resource request/release in runtime pm to save irq domain's
> power.
> 
> Signed-off-by: Frank Li <Frank.Li@....com>
> Signed-off-by: Fugang Duan <fugang.duan@....com>
> Reviewed-by: Frank Li <Frank.Li@....com>
> ---
>  drivers/i2c/busses/i2c-imx-lpi2c.c | 26 ++++++++++++++------------
>  1 file changed, 14 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c
> b/drivers/i2c/busses/i2c-imx-lpi2c.c
> index 664fcc0dba51..e718bb6b2387 100644
> --- a/drivers/i2c/busses/i2c-imx-lpi2c.c
> +++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
> @@ -94,6 +94,7 @@ enum lpi2c_imx_pincfg {
> 
>  struct lpi2c_imx_struct {
>  	struct i2c_adapter	adapter;
> +	int			irq;
>  	struct clk		*clk_per;
>  	struct clk		*clk_ipg;
>  	void __iomem		*base;
> @@ -543,7 +544,7 @@ static int lpi2c_imx_probe(struct platform_device
> *pdev)  {
>  	struct lpi2c_imx_struct *lpi2c_imx;
>  	unsigned int temp;
> -	int irq, ret;
> +	int ret;
> 
>  	lpi2c_imx = devm_kzalloc(&pdev->dev, sizeof(*lpi2c_imx), GFP_KERNEL);
>  	if (!lpi2c_imx)
> @@ -553,9 +554,9 @@ static int lpi2c_imx_probe(struct platform_device
> *pdev)
>  	if (IS_ERR(lpi2c_imx->base))
>  		return PTR_ERR(lpi2c_imx->base);
> 
> -	irq = platform_get_irq(pdev, 0);
> -	if (irq < 0)
> -		return irq;
> +	lpi2c_imx->irq = platform_get_irq(pdev, 0);
> +	if (lpi2c_imx->irq < 0)
> +		return lpi2c_imx->irq;
> 
>  	lpi2c_imx->adapter.owner	= THIS_MODULE;
>  	lpi2c_imx->adapter.algo		= &lpi2c_imx_algo;
> @@ -581,14 +582,6 @@ static int lpi2c_imx_probe(struct platform_device
> *pdev)
>  	if (ret)
>  		lpi2c_imx->bitrate = I2C_MAX_STANDARD_MODE_FREQ;
> 
> -	ret = devm_request_irq(&pdev->dev, irq, lpi2c_imx_isr,
> -			       IRQF_NO_SUSPEND,
> -			       pdev->name, lpi2c_imx);
> -	if (ret) {
> -		dev_err(&pdev->dev, "can't claim irq %d\n", irq);
> -		return ret;
> -	}
> -
>  	i2c_set_adapdata(&lpi2c_imx->adapter, lpi2c_imx);
>  	platform_set_drvdata(pdev, lpi2c_imx);
> 
> @@ -640,6 +633,7 @@ static int __maybe_unused
> lpi2c_runtime_suspend(struct device *dev)  {
>  	struct lpi2c_imx_struct *lpi2c_imx = dev_get_drvdata(dev);
> 
> +	devm_free_irq(dev, lpi2c_imx->irq, lpi2c_imx);
>  	clk_disable_unprepare(lpi2c_imx->clk_ipg);
>  	clk_disable_unprepare(lpi2c_imx->clk_per);
>  	pinctrl_pm_select_idle_state(dev);
> @@ -665,6 +659,14 @@ static int __maybe_unused
> lpi2c_runtime_resume(struct device *dev)
>  		dev_err(dev, "can't enable I2C ipg clock, ret=%d\n", ret);
>  	}
> 
> +	ret = devm_request_irq(dev, lpi2c_imx->irq, lpi2c_imx_isr,

I guess unnecessary to use devm in rpm

> +			       IRQF_NO_SUSPEND,
> +			       dev_name(dev), lpi2c_imx);
> +	if (ret) {
> +		dev_err(dev, "can't claim irq %d\n", lpi2c_imx->irq);
> +		return ret;
> +	}
> +
>  	return ret;
>  }
> 
> --
> 2.25.1