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Message-ID: <9cd6267e-cc06-107e-9bdf-33d4b66f35da@samsung.com>
Date: Wed, 25 Sep 2019 15:37:11 +0900
From: Chanwoo Choi <cw00.choi@...sung.com>
To: Artur Świgoń <a.swigon@...sung.com>,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-pm@...r.kernel.org, dri-devel@...ts.freedesktop.org
Cc: myungjoo.ham@...sung.com, inki.dae@...sung.com,
sw0312.kim@...sung.com, georgi.djakov@...aro.org,
leonard.crestez@....com, m.szyprowski@...sung.com,
b.zolnierkie@...sung.com, krzk@...nel.org
Subject: Re: [RFC PATCH v2 01/11] devfreq: exynos-bus: Extract
exynos_bus_profile_init()
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@...tner.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@...tner.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@...tner.samsung.com>
> Date: Tue Aug 27 13:17:28 2019 +0200
>
> tmp: merge patches 01-03
>
> Signed-off-by: Artur Świgoń <a.swigon@...tner.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
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