Re: [RESEND PATCH] thermal: mediatek: add suspend/resume callback

From: Daniel Lezcano <daniel.lezcano@linaro.org>
To: Michael Kao <michael.kao@mediatek.com>,
	Zhang Rui <rui.zhang@intel.com>,
	Eduardo Valentin <edubezval@gmail.com>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	hsinyi@chromium.org, linux-pm@vger.kernel.org,
	srv_heupstream@mediatek.com
Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-mediatek@lists.infradead.org,
	Louis Yu <louis.yu@mediatek.com>
Subject: Re: [RESEND PATCH] thermal: mediatek: add suspend/resume callback
Date: Fri, 22 May 2020 21:08:22 +0200	[thread overview]
Message-ID: <c95b1b31-b6c6-9b45-33f4-b3673ae27680@linaro.org> (raw)
In-Reply-To: <20200408090558.12410-2-michael.kao@mediatek.com>

On 08/04/2020 11:05, Michael Kao wrote:
> From: Louis Yu <louis.yu@mediatek.com>
> 
> Add suspend/resume callback to disable/enable Mediatek thermal sensor
> respectively. Since thermal power domain is off in suspend, thermal driver
> needs re-initialization during resume.
> 
> Signed-off-by: Louis Yu <louis.yu@mediatek.com>
> Signed-off-by: Michael Kao <michael.kao@mediatek.com>

[ ... ]

> +static int __maybe_unused mtk_thermal_suspend(struct device *dev)
> +{
> +	struct platform_device *pdev = to_platform_device(dev);
> +	struct mtk_thermal *mt = platform_get_drvdata(pdev);
> +	int i, ret;
> +

Why is there a multi-controller loop in the probe and resume functions
and not here?

> +	for (i = 0; i < mt->conf->num_banks; i++) {
> +		ret = mtk_thermal_disable_sensing(mt, i);
> +		if (ret)
> +			goto out;
> +	}
> +
> +	/* disable buffer */
> +	writel(readl(mt->apmixed_base + APMIXED_SYS_TS_CON1) |
> +	       APMIXED_SYS_TS_CON1_BUFFER_OFF,
> +	       mt->apmixed_base + APMIXED_SYS_TS_CON1);
> +
> +	clk_disable_unprepare(mt->clk_peri_therm);
> +	clk_disable_unprepare(mt->clk_auxadc);
> +
> +	return 0;
> +
> +out:
> +	dev_err(&pdev->dev, "Failed to wait until bus idle\n");
> +
> +	return ret;
> +}
> +
> +static int __maybe_unused mtk_thermal_resume(struct device *dev)
> +{
> +	struct platform_device *pdev = to_platform_device(dev);
> +	struct mtk_thermal *mt = platform_get_drvdata(pdev);
> +	int i, ret, ctrl_id;
> +
> +	ret = device_reset(&pdev->dev);
> +	if (ret)
> +		return ret;
> +
> +	ret = clk_prepare_enable(mt->clk_auxadc);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Can't enable auxadc clk: %d\n", ret);
> +		goto err_disable_clk_auxadc;
> +	}
> +
> +	ret = clk_prepare_enable(mt->clk_peri_therm);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Can't enable peri clk: %d\n", ret);
> +		goto err_disable_clk_peri_therm;
> +	}
> +
> +	for (ctrl_id = 0; ctrl_id < mt->conf->num_controller ; ctrl_id++)
> +		for (i = 0; i < mt->conf->num_banks; i++)
> +			mtk_thermal_init_bank(mt, i, mt->apmixed_phys_base,
> +					      mt->auxadc_phys_base, ctrl_id);
> +
> +	return 0;
> +
> +err_disable_clk_peri_therm:
> +	clk_disable_unprepare(mt->clk_peri_therm);
> +err_disable_clk_auxadc:
> +	clk_disable_unprepare(mt->clk_auxadc);
> +
> +	return ret;
> +}
> +
> +static SIMPLE_DEV_PM_OPS(mtk_thermal_pm_ops,
> +			 mtk_thermal_suspend, mtk_thermal_resume);
> +
>  static struct platform_driver mtk_thermal_driver = {
>  	.probe = mtk_thermal_probe,
>  	.remove = mtk_thermal_remove,
>  	.driver = {
>  		.name = "mtk-thermal",
> +		.pm = &mtk_thermal_pm_ops,
>  		.of_match_table = mtk_thermal_of_match,
>  	},
>  };
> 

-- 
<http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs

Follow Linaro:  <http://www.facebook.com/pages/Linaro> Facebook |
<http://twitter.com/#!/linaroorg> Twitter |
<http://www.linaro.org/linaro-blog/> Blog