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Message-ID: <553c5b7ad82f94272e5ef414435d3509f7b7d054.camel@samsung.com>
Date: Wed, 25 Sep 2019 08:41:14 +0200
From: Artur Świgoń <a.swigon@...sung.com>
To: Chanwoo Choi <cw00.choi@...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: a.swigon@...sung.com, 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()
On Wed, 2019-09-25 at 15:37 +0900, Chanwoo Choi wrote:
> 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.
I know that having three separate patches is suboptimal, but they are more readable
this way. I am glad you agree. I will keep them separate. Thank you for your
comments.
> >
> > 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);
> >
> >
> >
> >
>
>
--
Artur Świgoń
Samsung R&D Institute Poland
Samsung Electronics
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