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Subject: Re: [PATCH v7 15/21] memory: mtk-smi: Invoke pm runtime_callback to
 enable clocks
To:     Yong Wu <yong.wu@mediatek.com>, Joerg Roedel <joro@8bytes.org>,
        Robin Murphy <robin.murphy@arm.com>,
        Rob Herring <robh+dt@kernel.org>
Cc:     Evan Green <evgreen@chromium.org>, Tomasz Figa <tfiga@google.com>,
        Will Deacon <will.deacon@arm.com>,
        linux-mediatek@lists.infradead.org, srv_heupstream@mediatek.com,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        iommu@lists.linux-foundation.org, yingjoe.chen@mediatek.com,
        youlin.pei@mediatek.com, Nicolas Boichat <drinkcat@chromium.org>,
        anan.sun@mediatek.com, Matthias Kaehlcke <mka@chromium.org>
References: <1560169080-27134-1-git-send-email-yong.wu@mediatek.com>
 <1560169080-27134-16-git-send-email-yong.wu@mediatek.com>
From:   Matthias Brugger <matthias.bgg@gmail.com>
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Message-ID: <719e0d71-a9e1-4cb2-0efb-0cdddc65e036@gmail.com>
Date:   Mon, 17 Jun 2019 18:13:56 +0200
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On 10/06/2019 14:17, Yong Wu wrote:
> This patch only move the clk_prepare_enable and config_port into the
> runtime suspend/resume callback. It doesn't change the code content
> and sequence.
> 
> This is a preparing patch for adjusting SMI_BUS_SEL for mt8183.
> (SMI_BUS_SEL need to be restored after smi-common resume every time.)
> Also it gives a chance to get rid of mtk_smi_larb_get/put which could
> be a next topic.
> 
> CC: Matthias Brugger <matthias.bgg@gmail.com>
> Signed-off-by: Yong Wu <yong.wu@mediatek.com>
> Reviewed-by: Evan Green <evgreen@chromium.org>

Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>

> ---
>  drivers/memory/mtk-smi.c | 113 ++++++++++++++++++++++++++++++-----------------
>  1 file changed, 72 insertions(+), 41 deletions(-)
> 
> diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
> index a430721..9790801 100644
> --- a/drivers/memory/mtk-smi.c
> +++ b/drivers/memory/mtk-smi.c
> @@ -86,17 +86,13 @@ struct mtk_smi_larb { /* larb: local arbiter */
>  	u32				*mmu;
>  };
>  
> -static int mtk_smi_enable(const struct mtk_smi *smi)
> +static int mtk_smi_clk_enable(const struct mtk_smi *smi)
>  {
>  	int ret;
>  
> -	ret = pm_runtime_get_sync(smi->dev);
> -	if (ret < 0)
> -		return ret;
> -
>  	ret = clk_prepare_enable(smi->clk_apb);
>  	if (ret)
> -		goto err_put_pm;
> +		return ret;
>  
>  	ret = clk_prepare_enable(smi->clk_smi);
>  	if (ret)
> @@ -118,59 +114,28 @@ static int mtk_smi_enable(const struct mtk_smi *smi)
>  	clk_disable_unprepare(smi->clk_smi);
>  err_disable_apb:
>  	clk_disable_unprepare(smi->clk_apb);
> -err_put_pm:
> -	pm_runtime_put_sync(smi->dev);
>  	return ret;
>  }
>  
> -static void mtk_smi_disable(const struct mtk_smi *smi)
> +static void mtk_smi_clk_disable(const struct mtk_smi *smi)
>  {
>  	clk_disable_unprepare(smi->clk_gals1);
>  	clk_disable_unprepare(smi->clk_gals0);
>  	clk_disable_unprepare(smi->clk_smi);
>  	clk_disable_unprepare(smi->clk_apb);
> -	pm_runtime_put_sync(smi->dev);
>  }
>  
>  int mtk_smi_larb_get(struct device *larbdev)
>  {
> -	struct mtk_smi_larb *larb = dev_get_drvdata(larbdev);
> -	const struct mtk_smi_larb_gen *larb_gen = larb->larb_gen;
> -	struct mtk_smi *common = dev_get_drvdata(larb->smi_common_dev);
> -	int ret;
> +	int ret = pm_runtime_get_sync(larbdev);
>  
> -	/* Enable the smi-common's power and clocks */
> -	ret = mtk_smi_enable(common);
> -	if (ret)
> -		return ret;
> -
> -	/* Enable the larb's power and clocks */
> -	ret = mtk_smi_enable(&larb->smi);
> -	if (ret) {
> -		mtk_smi_disable(common);
> -		return ret;
> -	}
> -
> -	/* Configure the iommu info for this larb */
> -	larb_gen->config_port(larbdev);
> -
> -	return 0;
> +	return (ret < 0) ? ret : 0;
>  }
>  EXPORT_SYMBOL_GPL(mtk_smi_larb_get);
>  
>  void mtk_smi_larb_put(struct device *larbdev)
>  {
> -	struct mtk_smi_larb *larb = dev_get_drvdata(larbdev);
> -	struct mtk_smi *common = dev_get_drvdata(larb->smi_common_dev);
> -
> -	/*
> -	 * Don't de-configure the iommu info for this larb since there may be
> -	 * several modules in this larb.
> -	 * The iommu info will be reset after power off.
> -	 */
> -
> -	mtk_smi_disable(&larb->smi);
> -	mtk_smi_disable(common);
> +	pm_runtime_put_sync(larbdev);
>  }
>  EXPORT_SYMBOL_GPL(mtk_smi_larb_put);
>  
> @@ -385,12 +350,52 @@ static int mtk_smi_larb_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +static int __maybe_unused mtk_smi_larb_resume(struct device *dev)
> +{
> +	struct mtk_smi_larb *larb = dev_get_drvdata(dev);
> +	const struct mtk_smi_larb_gen *larb_gen = larb->larb_gen;
> +	int ret;
> +
> +	/* Power on smi-common. */
> +	ret = pm_runtime_get_sync(larb->smi_common_dev);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to pm get for smi-common(%d).\n", ret);
> +		return ret;
> +	}
> +
> +	ret = mtk_smi_clk_enable(&larb->smi);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to enable clock(%d).\n", ret);
> +		pm_runtime_put_sync(larb->smi_common_dev);
> +		return ret;
> +	}
> +
> +	/* Configure the basic setting for this larb */
> +	larb_gen->config_port(dev);
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused mtk_smi_larb_suspend(struct device *dev)
> +{
> +	struct mtk_smi_larb *larb = dev_get_drvdata(dev);
> +
> +	mtk_smi_clk_disable(&larb->smi);
> +	pm_runtime_put_sync(larb->smi_common_dev);
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops smi_larb_pm_ops = {
> +	SET_RUNTIME_PM_OPS(mtk_smi_larb_suspend, mtk_smi_larb_resume, NULL)
> +};
> +
>  static struct platform_driver mtk_smi_larb_driver = {
>  	.probe	= mtk_smi_larb_probe,
>  	.remove	= mtk_smi_larb_remove,
>  	.driver	= {
>  		.name = "mtk-smi-larb",
>  		.of_match_table = mtk_smi_larb_of_ids,
> +		.pm             = &smi_larb_pm_ops,
>  	}
>  };
>  
> @@ -489,12 +494,38 @@ static int mtk_smi_common_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +static int __maybe_unused mtk_smi_common_resume(struct device *dev)
> +{
> +	struct mtk_smi *common = dev_get_drvdata(dev);
> +	int ret;
> +
> +	ret = mtk_smi_clk_enable(common);
> +	if (ret) {
> +		dev_err(common->dev, "Failed to enable clock(%d).\n", ret);
> +		return ret;
> +	}
> +	return 0;
> +}
> +
> +static int __maybe_unused mtk_smi_common_suspend(struct device *dev)
> +{
> +	struct mtk_smi *common = dev_get_drvdata(dev);
> +
> +	mtk_smi_clk_disable(common);
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops smi_common_pm_ops = {
> +	SET_RUNTIME_PM_OPS(mtk_smi_common_suspend, mtk_smi_common_resume, NULL)
> +};
> +
>  static struct platform_driver mtk_smi_common_driver = {
>  	.probe	= mtk_smi_common_probe,
>  	.remove = mtk_smi_common_remove,
>  	.driver	= {
>  		.name = "mtk-smi-common",
>  		.of_match_table = mtk_smi_common_of_ids,
> +		.pm             = &smi_common_pm_ops,
>  	}
>  };
>  
>