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Subject: Re: [RFC PATCH v2 01/11] devfreq: exynos-bus: Extract
 exynos_bus_profile_init()
To:     =?UTF-8?B?QXJ0dXIgxZp3aWdvxYQ=?= <a.swigon@samsung.com>,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-pm@vger.kernel.org, dri-devel@lists.freedesktop.org
Cc:     myungjoo.ham@samsung.com, inki.dae@samsung.com,
        sw0312.kim@samsung.com, georgi.djakov@linaro.org,
        leonard.crestez@nxp.com, m.szyprowski@samsung.com,
        b.zolnierkie@samsung.com, krzk@kernel.org
From:   Chanwoo Choi <cw00.choi@samsung.com>
Organization: Samsung Electronics
Message-ID: <9cd6267e-cc06-107e-9bdf-33d4b66f35da@samsung.com>
Date:   Wed, 25 Sep 2019 15:37:11 +0900
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References: <20190919142236.4071-1-a.swigon@samsung.com>
        <CGME20190919142322eucas1p24bc477ee6e1bcd65546c305d55af097d@eucas1p2.samsung.com>
        <20190919142236.4071-2-a.swigon@samsung.com>
        <2e49bd2c-e074-038b-f8a2-7dd8dea4a9af@samsung.com>
        <f51aac4cacb7a0196ab6919b110ad9fcf4009c88.camel@samsung.com>
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Hi,

On 19. 9. 25. 오후 2:44, Artur Świgoń wrote:
> Hi,
> 
> On Fri, 2019-09-20 at 11:15 +0900, Chanwoo Choi wrote:
>> Hi,
>>
>> As I already replied on v1, patch1/2/3 clean-up code
>> for readability without any behavior changes. 
>>
>> I think that you better to merge patch1/2/3 to one patch.
> 
> Yes, when writing the cover letter I think I forgot to explain why I decided not
> to merge these patches. Basically, none of the diff algorithms available in git
> (I've got v2.17.1) is able to produce a readable patch with these changes
> combined together into a single patch (functions are intermixed together in the
> output, git thinks that 'exynos_bus_probe' is a new function).

After merged three patches, as you commented, looks like that 'exynos_bus_probe'
is new function. Your patch style(three patches) is better than one merged patch.
Keep your original patches. Thanks.

> 
> Please take a look at the diff at the bottom of this message to see how patches
> 01..03 look when combined. If such patch looks acceptable to you, I can merge.
> 
>> On 19. 9. 19. 오후 11:22, Artur Świgoń wrote:
>>> From: Artur Świgoń <a.swigon@partner.samsung.com>
>>>
>>> This patch adds a new static function, exynos_bus_profile_init(), extracted
>>> from exynos_bus_probe().
>>>
>>> Signed-off-by: Artur Świgoń <a.swigon@partner.samsung.com>
>>> ---
>>>  drivers/devfreq/exynos-bus.c | 92 +++++++++++++++++++++---------------
>>>  1 file changed, 53 insertions(+), 39 deletions(-)
>>>
>>> diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c
>>> index 29f422469960..78f38b7fb596 100644
>>> --- a/drivers/devfreq/exynos-bus.c
>>> +++ b/drivers/devfreq/exynos-bus.c
>>> @@ -287,12 +287,62 @@ static int exynos_bus_parse_of(struct device_node *np,
>>>  	return ret;
>>>  }
>>>  
>>> +static int exynos_bus_profile_init(struct exynos_bus *bus,
>>> +				   struct devfreq_dev_profile *profile)
>>> +{
>>> +	struct device *dev = bus->dev;
>>> +	struct devfreq_simple_ondemand_data *ondemand_data;
>>> +	int ret;
>>> +
>>> +	/* Initialize the struct profile and governor data for parent device */
>>> +	profile->polling_ms = 50;
>>> +	profile->target = exynos_bus_target;
>>> +	profile->get_dev_status = exynos_bus_get_dev_status;
>>> +	profile->exit = exynos_bus_exit;
>>> +
>>> +	ondemand_data = devm_kzalloc(dev, sizeof(*ondemand_data), GFP_KERNEL);
>>> +	if (!ondemand_data) {
>>> +		ret = -ENOMEM;
>>> +		goto err;
>>> +	}
>>> +	ondemand_data->upthreshold = 40;
>>> +	ondemand_data->downdifferential = 5;
>>> +
>>> +	/* Add devfreq device to monitor and handle the exynos bus */
>>> +	bus->devfreq = devm_devfreq_add_device(dev, profile,
>>> +						DEVFREQ_GOV_SIMPLE_ONDEMAND,
>>> +						ondemand_data);
>>> +	if (IS_ERR(bus->devfreq)) {
>>> +		dev_err(dev, "failed to add devfreq device\n");
>>> +		ret = PTR_ERR(bus->devfreq);
>>> +		goto err;
>>> +	}
>>> +
>>> +	/*
>>> +	 * Enable devfreq-event to get raw data which is used to determine
>>> +	 * current bus load.
>>> +	 */
>>> +	ret = exynos_bus_enable_edev(bus);
>>> +	if (ret < 0) {
>>> +		dev_err(dev, "failed to enable devfreq-event devices\n");
>>> +		goto err;
>>> +	}
>>> +
>>> +	ret = exynos_bus_set_event(bus);
>>> +	if (ret < 0) {
>>> +		dev_err(dev, "failed to set event to devfreq-event devices\n");
>>> +		goto err;
>>> +	}
>>> +
>>> +err:
>>> +	return ret;
>>> +}
>>> +
>>>  static int exynos_bus_probe(struct platform_device *pdev)
>>>  {
>>>  	struct device *dev = &pdev->dev;
>>>  	struct device_node *np = dev->of_node, *node;
>>>  	struct devfreq_dev_profile *profile;
>>> -	struct devfreq_simple_ondemand_data *ondemand_data;
>>>  	struct devfreq_passive_data *passive_data;
>>>  	struct devfreq *parent_devfreq;
>>>  	struct exynos_bus *bus;
>>> @@ -334,45 +384,9 @@ static int exynos_bus_probe(struct platform_device *pdev)
>>>  	if (passive)
>>>  		goto passive;
>>>  
>>> -	/* Initialize the struct profile and governor data for parent device */
>>> -	profile->polling_ms = 50;
>>> -	profile->target = exynos_bus_target;
>>> -	profile->get_dev_status = exynos_bus_get_dev_status;
>>> -	profile->exit = exynos_bus_exit;
>>> -
>>> -	ondemand_data = devm_kzalloc(dev, sizeof(*ondemand_data), GFP_KERNEL);
>>> -	if (!ondemand_data) {
>>> -		ret = -ENOMEM;
>>> +	ret = exynos_bus_profile_init(bus, profile);
>>> +	if (ret < 0)
>>>  		goto err;
>>> -	}
>>> -	ondemand_data->upthreshold = 40;
>>> -	ondemand_data->downdifferential = 5;
>>> -
>>> -	/* Add devfreq device to monitor and handle the exynos bus */
>>> -	bus->devfreq = devm_devfreq_add_device(dev, profile,
>>> -						DEVFREQ_GOV_SIMPLE_ONDEMAND,
>>> -						ondemand_data);
>>> -	if (IS_ERR(bus->devfreq)) {
>>> -		dev_err(dev, "failed to add devfreq device\n");
>>> -		ret = PTR_ERR(bus->devfreq);
>>> -		goto err;
>>> -	}
>>> -
>>> -	/*
>>> -	 * Enable devfreq-event to get raw data which is used to determine
>>> -	 * current bus load.
>>> -	 */
>>> -	ret = exynos_bus_enable_edev(bus);
>>> -	if (ret < 0) {
>>> -		dev_err(dev, "failed to enable devfreq-event devices\n");
>>> -		goto err;
>>> -	}
>>> -
>>> -	ret = exynos_bus_set_event(bus);
>>> -	if (ret < 0) {
>>> -		dev_err(dev, "failed to set event to devfreq-event devices\n");
>>> -		goto err;
>>> -	}
>>>  
>>>  	goto out;
>>>  passive:
> 
> commit cacf8e4ea0e111908d11779977c81e29d6418801
> Author: Artur Świgoń <a.swigon@partner.samsung.com>
> Date:   Tue Aug 27 13:17:28 2019 +0200
> 
>     tmp: merge patches 01-03
>     
>     Signed-off-by: Artur Świgoń <a.swigon@partner.samsung.com>
> 
> diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c
> index 29f422469960..60ad4319fd80 100644
> --- a/drivers/devfreq/exynos-bus.c
> +++ b/drivers/devfreq/exynos-bus.c
> @@ -287,52 +287,12 @@ static int exynos_bus_parse_of(struct device_node *np,
>  	return ret;
>  }
>  
> -static int exynos_bus_probe(struct platform_device *pdev)
> +static int exynos_bus_profile_init(struct exynos_bus *bus,
> +				   struct devfreq_dev_profile *profile)
>  {
> -	struct device *dev = &pdev->dev;
> -	struct device_node *np = dev->of_node, *node;
> -	struct devfreq_dev_profile *profile;
> +	struct device *dev = bus->dev;
>  	struct devfreq_simple_ondemand_data *ondemand_data;
> -	struct devfreq_passive_data *passive_data;
> -	struct devfreq *parent_devfreq;
> -	struct exynos_bus *bus;
> -	int ret, max_state;
> -	unsigned long min_freq, max_freq;
> -	bool passive = false;
> -
> -	if (!np) {
> -		dev_err(dev, "failed to find devicetree node\n");
> -		return -EINVAL;
> -	}
> -
> -	bus = devm_kzalloc(&pdev->dev, sizeof(*bus), GFP_KERNEL);
> -	if (!bus)
> -		return -ENOMEM;
> -	mutex_init(&bus->lock);
> -	bus->dev = &pdev->dev;
> -	platform_set_drvdata(pdev, bus);
> -
> -	profile = devm_kzalloc(dev, sizeof(*profile), GFP_KERNEL);
> -	if (!profile)
> -		return -ENOMEM;
> -
> -	node = of_parse_phandle(dev->of_node, "devfreq", 0);
> -	if (node) {
> -		of_node_put(node);
> -		passive = true;
> -	} else {
> -		ret = exynos_bus_parent_parse_of(np, bus);
> -		if (ret < 0)
> -			return ret;
> -	}
> -
> -	/* Parse the device-tree to get the resource information */
> -	ret = exynos_bus_parse_of(np, bus);
> -	if (ret < 0)
> -		goto err_reg;
> -
> -	if (passive)
> -		goto passive;
> +	int ret;
>  
>  	/* Initialize the struct profile and governor data for parent device */
>  	profile->polling_ms = 50;
> @@ -374,8 +334,18 @@ static int exynos_bus_probe(struct platform_device *pdev)
>  		goto err;
>  	}
>  
> -	goto out;
> -passive:
> +err:
> +	return ret;
> +}
> +
> +static int exynos_bus_profile_init_passive(struct exynos_bus *bus,
> +					   struct devfreq_dev_profile *profile)
> +{
> +	struct device *dev = bus->dev;
> +	struct devfreq_passive_data *passive_data;
> +	struct devfreq *parent_devfreq;
> +	int ret = 0;
> +
>  	/* Initialize the struct profile and governor data for passive device */
>  	profile->target = exynos_bus_target;
>  	profile->exit = exynos_bus_passive_exit;
> @@ -404,7 +374,59 @@ static int exynos_bus_probe(struct platform_device *pdev)
>  		goto err;
>  	}
>  
> -out:
> +err:
> +	return ret;
> +}
> +
> +static int exynos_bus_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct device_node *np = dev->of_node, *node;
> +	struct devfreq_dev_profile *profile;
> +	struct exynos_bus *bus;
> +	int ret, max_state;
> +	unsigned long min_freq, max_freq;
> +	bool passive = false;
> +
> +	if (!np) {
> +		dev_err(dev, "failed to find devicetree node\n");
> +		return -EINVAL;
> +	}
> +
> +	bus = devm_kzalloc(&pdev->dev, sizeof(*bus), GFP_KERNEL);
> +	if (!bus)
> +		return -ENOMEM;
> +	mutex_init(&bus->lock);
> +	bus->dev = &pdev->dev;
> +	platform_set_drvdata(pdev, bus);
> +
> +	profile = devm_kzalloc(dev, sizeof(*profile), GFP_KERNEL);
> +	if (!profile)
> +		return -ENOMEM;
> +
> +	node = of_parse_phandle(dev->of_node, "devfreq", 0);
> +	if (node) {
> +		of_node_put(node);
> +		passive = true;
> +	} else {
> +		ret = exynos_bus_parent_parse_of(np, bus);
> +		if (ret < 0)
> +			return ret;
> +	}
> +
> +	/* Parse the device-tree to get the resource information */
> +	ret = exynos_bus_parse_of(np, bus);
> +	if (ret < 0)
> +		goto err_reg;
> +
> +	if (passive)
> +		ret = exynos_bus_profile_init_passive(bus, profile);
> +	else
> +		ret = exynos_bus_profile_init(bus, profile);
> +
> +	if (ret < 0)
> +		goto err;
> +
>  	max_state = bus->devfreq->profile->max_state;
>  	min_freq = (bus->devfreq->profile->freq_table[0] / 1000);
>  	max_freq = (bus->devfreq->profile->freq_table[max_state - 1] / 1000);
> 
> 
> 
> 


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics