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From:   Clark Wang <xiaoning.wang@nxp.com>
To:     Miquel Raynal <miquel.raynal@bootlin.com>
CC:     "conor.culhane@silvaco.com" <conor.culhane@silvaco.com>,
        "alexandre.belloni@bootlin.com" <alexandre.belloni@bootlin.com>,
        "linux-i3c@lists.infradead.org" <linux-i3c@lists.infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH V2 5/5] i3c: master: svc: add runtime pm support
Thread-Topic: [PATCH V2 5/5] i3c: master: svc: add runtime pm support
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Date:   Fri, 16 Jul 2021 08:43:09 +0000
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> -----Original Message-----
> From: Miquel Raynal <miquel.raynal@bootlin.com>
> Sent: Friday, July 16, 2021 16:00
> To: Clark Wang <xiaoning.wang@nxp.com>
> Cc: conor.culhane@silvaco.com; alexandre.belloni@bootlin.com; linux-
> i3c@lists.infradead.org; linux-kernel@vger.kernel.org
> Subject: Re: [PATCH V2 5/5] i3c: master: svc: add runtime pm support
>=20
> Hi Clark,
>=20
>=20
> > @@ -1431,7 +1502,7 @@ static int svc_i3c_master_probe(struct
> platform_device *pdev)
> >  					 GFP_KERNEL);
> >  	if (!master->ibi.slots) {
> >  		ret =3D -ENOMEM;
> > -		goto err_disable_sclk;
> > +		goto rpm_disable;
> >  	}
> >
> >  	platform_set_drvdata(pdev, master);
> > @@ -1442,18 +1513,17 @@ static int svc_i3c_master_probe(struct
> platform_device *pdev)
> >  	ret =3D i3c_master_register(&master->base, &pdev->dev,
> >  				  &svc_i3c_master_ops, false);
> >  	if (ret)
> > -		goto err_disable_sclk;
> > +		goto rpm_disable;
> >
> > -	return 0;
> > -
> > -err_disable_sclk:
> > -	clk_disable_unprepare(master->sclk);
> > +	pm_runtime_mark_last_busy(&pdev->dev);
> > +	pm_runtime_put_autosuspend(&pdev->dev);
> >
> > -err_disable_fclk:
> > -	clk_disable_unprepare(master->fclk);
> > +	return 0;
> >
> > -err_disable_pclk:
> > -	clk_disable_unprepare(master->pclk);
>=20
> It's not clear to me why you drop the disable_*clk labels to move them =
back
> in place? I would rather prefer to keep a clean error path.

Hi Miquel,

Yes it is. This change is indeed not very clear.
I have restored the error path.
And I found that it is not necessary to enable runtime pm so early.

Please check V3.

Thanks.

Best Regards,
Clark Wang

>=20
> > +rpm_disable:
> > +	pm_runtime_dont_use_autosuspend(&pdev->dev);
> > +	pm_runtime_put_sync(&pdev->dev);
> > +	pm_runtime_disable(&pdev->dev);
> >
> >  	return ret;
> >  }
> > @@ -1467,13 +1537,57 @@ static int svc_i3c_master_remove(struct
> platform_device *pdev)
> >  	if (ret)
> >  		return ret;
> >
> > +	pm_runtime_dont_use_autosuspend(&pdev->dev);
> > +	pm_runtime_disable(&pdev->dev);
> > +
> > +	return 0;
> > +}
> > +
> > +static int __maybe_unused svc_i3c_runtime_suspend(struct device =
*dev)
> > +{
> > +	struct svc_i3c_master *master =3D dev_get_drvdata(dev);
> > +
> >  	clk_disable_unprepare(master->pclk);
> >  	clk_disable_unprepare(master->fclk);
> >  	clk_disable_unprepare(master->sclk);
> > +	pinctrl_pm_select_sleep_state(dev);
> >
> >  	return 0;
> >  }
> >
> > +static int __maybe_unused svc_i3c_runtime_resume(struct device =
*dev)
> > +{
> > +	struct svc_i3c_master *master =3D dev_get_drvdata(dev);
> > +	int ret =3D 0;
> > +
> > +	pinctrl_pm_select_default_state(dev);
> > +	ret =3D clk_prepare_enable(master->pclk);
> > +	if (ret)
> > +		return ret;
> > +
> > +	ret =3D clk_prepare_enable(master->fclk);
> > +	if (ret) {
> > +		clk_disable_unprepare(master->pclk);
> > +		return ret;
> > +	}
> > +
> > +	ret =3D clk_prepare_enable(master->sclk);
> > +	if (ret) {
> > +		clk_disable_unprepare(master->pclk);
> > +		clk_disable_unprepare(master->fclk);
> > +		return ret;
> > +	}
> > +
> > +	return ret;
> > +}
> > +
> > +static const struct dev_pm_ops svc_i3c_pm_ops =3D {
> > +	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
> > +				      pm_runtime_force_resume)
> > +	SET_RUNTIME_PM_OPS(svc_i3c_runtime_suspend,
> > +			   svc_i3c_runtime_resume, NULL)
> > +};
> > +
> >  static const struct of_device_id svc_i3c_master_of_match_tbl[] =3D =
{
> >  	{ .compatible =3D "silvaco,i3c-master" },
> >  	{ /* sentinel */ },
> > @@ -1485,6 +1599,7 @@ static struct platform_driver svc_i3c_master =
=3D {
> >  	.driver =3D {
> >  		.name =3D "silvaco-i3c-master",
> >  		.of_match_table =3D svc_i3c_master_of_match_tbl,
> > +		.pm =3D &svc_i3c_pm_ops,
> >  	},
> >  };
> >  module_platform_driver(svc_i3c_master);
>=20
> Thanks,
> Miqu=C3=A8l

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