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Date:   Fri, 17 Jul 2020 10:48:10 +0000
From:   Joakim Zhang <qiangqing.zhang@....com>
To:     Marc Zyngier <maz@...nel.org>
CC:     "tglx@...utronix.de" <tglx@...utronix.de>,
        "jason@...edaemon.net" <jason@...edaemon.net>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.or" 
        <linux-arm-kernel@...ts.infradead.or>
Subject: RE: [PATCH 2/2] irqchip: imx-intmux: add runtime PM support


> -----Original Message-----
> From: Marc Zyngier <maz@...nel.org>
> Sent: 2020年7月17日 16:58
> To: Joakim Zhang <qiangqing.zhang@....com>
> Cc: tglx@...utronix.de; jason@...edaemon.net; shawnguo@...nel.org;
> s.hauer@...gutronix.de; kernel@...gutronix.de; festevam@...il.com;
> dl-linux-imx <linux-imx@....com>; linux-kernel@...r.kernel.org;
> linux-arm-kernel@...ts.infradead.or
> Subject: Re: [PATCH 2/2] irqchip: imx-intmux: add runtime PM support
> 
> On 2020-07-16 20:32, Joakim Zhang wrote:
> > Add runtime PM support for intmux interrupt controller.
> 
> Same as the previous patch. The changes are significant enough that you need
> to write a proper change log.
> 
> >
> > Signed-off-by: Joakim Zhang <qiangqing.zhang@....com>
> > ---
> >  drivers/irqchip/irq-imx-intmux.c | 31 +++++++++++++++++++++++++------
> >  1 file changed, 25 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/irqchip/irq-imx-intmux.c
> > b/drivers/irqchip/irq-imx-intmux.c
> > index 6095f76c4f0d..a631815c7bb4 100644
> > --- a/drivers/irqchip/irq-imx-intmux.c
> > +++ b/drivers/irqchip/irq-imx-intmux.c
> > @@ -53,6 +53,7 @@
> >  #include <linux/of_irq.h>
> >  #include <linux/of_platform.h>
> >  #include <linux/spinlock.h>
> > +#include <linux/pm_runtime.h>
> >
> >  #define CHANIER(n)	(0x10 + (0x40 * n))
> >  #define CHANIPR(n)	(0x20 + (0x40 * n))
> > @@ -60,6 +61,7 @@
> >  #define CHAN_MAX_NUM		0x8
> >
> >  struct intmux_irqchip_data {
> > +	struct irq_chip		chip;
> >  	int			chanidx;
> >  	int			irq;
> >  	struct irq_domain	*domain;
> > @@ -123,8 +125,10 @@ static struct irq_chip imx_intmux_irq_chip = {
> > static int imx_intmux_irq_map(struct irq_domain *h, unsigned int irq,
> >  			      irq_hw_number_t hwirq)
> >  {
> > -	irq_set_chip_data(irq, h->host_data);
> > -	irq_set_chip_and_handler(irq, &imx_intmux_irq_chip,
> > handle_level_irq);
> > +	struct intmux_irqchip_data *data = h->host_data;
> > +
> > +	irq_set_chip_data(irq, data);
> > +	irq_set_chip_and_handler(irq, &data->chip, handle_level_irq);
> >
> >  	return 0;
> >  }
> > @@ -244,6 +248,10 @@ static int imx_intmux_probe(struct
> > platform_device
> > *pdev)
> >  			return -ENOMEM;
> >  	}
> >
> > +	pm_runtime_get_noresume(&pdev->dev);
> > +	pm_runtime_set_active(&pdev->dev);
> > +	pm_runtime_enable(&pdev->dev);
> > +
> >  	ret = clk_prepare_enable(data->ipg_clk);
> >  	if (ret) {
> >  		dev_err(&pdev->dev, "failed to enable ipg clk: %d\n", ret); @@
> > -251,6 +259,8 @@ static int imx_intmux_probe(struct platform_device
> > *pdev)
> >  	}
> >
> >  	for (i = 0; i < channum; i++) {
> > +		data->irqchip_data[i].chip = imx_intmux_irq_chip;
> > +		data->irqchip_data[i].chip.parent_device = &pdev->dev;
> 
> At some point, we will have to find a way to throw the parent_device thing out
> of the irq_chip structure. This thing is a liability.
> Nothing you can do about it for now though.
> 
> >  		data->irqchip_data[i].chanidx = i;
> >
> >  		data->irqchip_data[i].irq = irq_of_parse_and_map(np, i); @@ -279,6
> > +289,12 @@ static int imx_intmux_probe(struct platform_device
> > *pdev)
> >
> >  	platform_set_drvdata(pdev, data);
> >
> > +	/*
> > +	 * Let pm_runtime_put() disable clock.
> > +	 * If CONFIG_PM is not enabled, the clock will stay powered.
> > +	 */
> > +	pm_runtime_put(&pdev->dev);
> > +
> >  	return 0;
> >  out:
> >  	clk_disable_unprepare(data->ipg_clk);
> > @@ -300,7 +316,7 @@ static int imx_intmux_remove(struct
> > platform_device
> > *pdev)
> >  		irq_domain_remove(data->irqchip_data[i].domain);
> >  	}
> >
> > -	clk_disable_unprepare(data->ipg_clk);
> > +	pm_runtime_disable(&pdev->dev);
> >
> >  	return 0;
> >  }
> > @@ -322,7 +338,7 @@ static void imx_intmux_restore_regs(struct
> > intmux_data *data)
> >  		writel_relaxed(data->saved_reg[i], data->regs + CHANIER(i));  }
> >
> > -static int imx_intmux_suspend(struct device *dev)
> > +static int imx_intmux_runtime_suspend(struct device *dev)
> >  {
> >  	struct intmux_data *data = dev_get_drvdata(dev);
> >
> > @@ -332,7 +348,7 @@ static int imx_intmux_suspend(struct device *dev)
> >  	return 0;
> >  }
> >
> > -static int imx_intmux_resume(struct device *dev)
> > +static int imx_intmux_runtime_resume(struct device *dev)
> 
> You just introduced these two functions, and rename them immediately?
> 
> >  {
> >  	struct intmux_data *data = dev_get_drvdata(dev);
> >  	int ret;
> > @@ -349,7 +365,10 @@ static int imx_intmux_resume(struct device *dev)
> > #endif
> >
> >  static const struct dev_pm_ops imx_intmux_pm_ops = {
> > -	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(imx_intmux_suspend,
> imx_intmux_resume)
> > +	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
> > +				      pm_runtime_force_resume)
> > +	SET_RUNTIME_PM_OPS(imx_intmux_runtime_suspend,
> > +			   imx_intmux_runtime_resume, NULL)
> >  };
> >
> >  static const struct of_device_id imx_intmux_id[] = {
> 
> I think you'd might as well squash the two patches together.
> Splitting the two serves little purpose.

Thanks Marc for your kindly review, I will improve all following your comments in next version.

Best Regards,
Joakim Zhang
> Thanks,
> 
>          M.
> --
> Jazz is not dead. It just smells funny...

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