diff mbox series

[28/31] PM / devfreq: imx8m-ddrc: convert to use devm_pm_opp_* API

Message ID 20210103035540.23886-1-tiny.windzz@gmail.com (mailing list archive)
State Changes Requested, archived
Delegated to: Chanwoo Choi
Headers show
Series None | expand

Commit Message

Yangtao Li Jan. 3, 2021, 3:55 a.m. UTC
Use devm_pm_opp_* API to simplify code.

Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
---
 drivers/devfreq/imx8m-ddrc.c | 15 ++-------------
 1 file changed, 2 insertions(+), 13 deletions(-)

Comments

Chanwoo Choi Jan. 5, 2021, 4:13 a.m. UTC | #1
On Sun, Jan 3, 2021 at 12:58 PM Yangtao Li <tiny.windzz@gmail.com> wrote:
>
> Use devm_pm_opp_* API to simplify code.
>
> Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
> ---
>  drivers/devfreq/imx8m-ddrc.c | 15 ++-------------
>  1 file changed, 2 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/devfreq/imx8m-ddrc.c b/drivers/devfreq/imx8m-ddrc.c
> index bc82d3653bff..9383d6e5538b 100644
> --- a/drivers/devfreq/imx8m-ddrc.c
> +++ b/drivers/devfreq/imx8m-ddrc.c
> @@ -370,11 +370,6 @@ static int imx8m_ddrc_check_opps(struct device *dev)
>         return 0;
>  }
>
> -static void imx8m_ddrc_exit(struct device *dev)
> -{
> -       dev_pm_opp_of_remove_table(dev);
> -}
> -
>  static int imx8m_ddrc_probe(struct platform_device *pdev)
>  {
>         struct device *dev = &pdev->dev;
> @@ -419,7 +414,7 @@ static int imx8m_ddrc_probe(struct platform_device *pdev)
>                 return ret;
>         }
>
> -       ret = dev_pm_opp_of_add_table(dev);
> +       ret = devm_pm_opp_of_add_table(dev);
>         if (ret < 0) {
>                 dev_err(dev, "failed to get OPP table\n");
>                 return ret;
> @@ -427,12 +422,11 @@ static int imx8m_ddrc_probe(struct platform_device *pdev)
>
>         ret = imx8m_ddrc_check_opps(dev);
>         if (ret < 0)
> -               goto err;
> +               return ret;
>
>         priv->profile.polling_ms = 1000;
>         priv->profile.target = imx8m_ddrc_target;
>         priv->profile.get_dev_status = imx8m_ddrc_get_dev_status;
> -       priv->profile.exit = imx8m_ddrc_exit;
>         priv->profile.get_cur_freq = imx8m_ddrc_get_cur_freq;
>         priv->profile.initial_freq = clk_get_rate(priv->dram_core);
>
> @@ -441,13 +435,8 @@ static int imx8m_ddrc_probe(struct platform_device *pdev)
>         if (IS_ERR(priv->devfreq)) {
>                 ret = PTR_ERR(priv->devfreq);
>                 dev_err(dev, "failed to add devfreq device: %d\n", ret);
> -               goto err;
>         }
>
> -       return 0;
> -
> -err:
> -       dev_pm_opp_of_remove_table(dev);
>         return ret;

devm_devfreq_add_device() doesn't return any integer value.
Even if devm_devfreq_add_device() returns the right devfreq instance,
the 'ret' value  is not the return value of  devm_devfreq_add_device().

On this patch, 'ret' value of 'return ret' is from imx8m_ddrc_check_opps().
Surely, it is well working with this modification. But, it is not code
for exception handling.
So, we need to remain the following codes:

    return 0;
err:
    return ret;

>  }
>
> --
> 2.25.1
>
Chanwoo Choi Jan. 5, 2021, 7:59 p.m. UTC | #2
Hi Yangtao,

On Tue, Jan 5, 2021 at 1:13 PM Chanwoo Choi <cwchoi00@gmail.com> wrote:
>
> On Sun, Jan 3, 2021 at 12:58 PM Yangtao Li <tiny.windzz@gmail.com> wrote:
> >
> > Use devm_pm_opp_* API to simplify code.
> >
> > Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
> > ---
> >  drivers/devfreq/imx8m-ddrc.c | 15 ++-------------
> >  1 file changed, 2 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/devfreq/imx8m-ddrc.c b/drivers/devfreq/imx8m-ddrc.c
> > index bc82d3653bff..9383d6e5538b 100644
> > --- a/drivers/devfreq/imx8m-ddrc.c
> > +++ b/drivers/devfreq/imx8m-ddrc.c
> > @@ -370,11 +370,6 @@ static int imx8m_ddrc_check_opps(struct device *dev)
> >         return 0;
> >  }
> >
> > -static void imx8m_ddrc_exit(struct device *dev)
> > -{
> > -       dev_pm_opp_of_remove_table(dev);
> > -}
> > -
> >  static int imx8m_ddrc_probe(struct platform_device *pdev)
> >  {
> >         struct device *dev = &pdev->dev;
> > @@ -419,7 +414,7 @@ static int imx8m_ddrc_probe(struct platform_device *pdev)
> >                 return ret;
> >         }
> >
> > -       ret = dev_pm_opp_of_add_table(dev);
> > +       ret = devm_pm_opp_of_add_table(dev);
> >         if (ret < 0) {
> >                 dev_err(dev, "failed to get OPP table\n");
> >                 return ret;
> > @@ -427,12 +422,11 @@ static int imx8m_ddrc_probe(struct platform_device *pdev)
> >
> >         ret = imx8m_ddrc_check_opps(dev);
> >         if (ret < 0)
> > -               goto err;
> > +               return ret;
> >
> >         priv->profile.polling_ms = 1000;
> >         priv->profile.target = imx8m_ddrc_target;
> >         priv->profile.get_dev_status = imx8m_ddrc_get_dev_status;
> > -       priv->profile.exit = imx8m_ddrc_exit;
> >         priv->profile.get_cur_freq = imx8m_ddrc_get_cur_freq;
> >         priv->profile.initial_freq = clk_get_rate(priv->dram_core);
> >
> > @@ -441,13 +435,8 @@ static int imx8m_ddrc_probe(struct platform_device *pdev)
> >         if (IS_ERR(priv->devfreq)) {
> >                 ret = PTR_ERR(priv->devfreq);
> >                 dev_err(dev, "failed to add devfreq device: %d\n", ret);
> > -               goto err;
> >         }
> >
> > -       return 0;
> > -
> > -err:
> > -       dev_pm_opp_of_remove_table(dev);
> >         return ret;
>
> devm_devfreq_add_device() doesn't return any integer value.
> Even if devm_devfreq_add_device() returns the right devfreq instance,
> the 'ret' value  is not the return value of  devm_devfreq_add_device().
>
> On this patch, 'ret' value of 'return ret' is from imx8m_ddrc_check_opps().
> Surely, it is well working with this modification. But, it is not code
> for exception handling.
> So, we need to remain the following codes:
>
>     return 0;
> err:
>     return ret;
>

'err' is not necessary. You better to edit it as following:

if (IS_ERR(priv->devfreq)) {
    dev_err(dev, "failed to add devfreq device: %d\n", ret);
    return PTR_ERR(priv->devfreq);
}

return 0;
diff mbox series

Patch

diff --git a/drivers/devfreq/imx8m-ddrc.c b/drivers/devfreq/imx8m-ddrc.c
index bc82d3653bff..9383d6e5538b 100644
--- a/drivers/devfreq/imx8m-ddrc.c
+++ b/drivers/devfreq/imx8m-ddrc.c
@@ -370,11 +370,6 @@  static int imx8m_ddrc_check_opps(struct device *dev)
 	return 0;
 }
 
-static void imx8m_ddrc_exit(struct device *dev)
-{
-	dev_pm_opp_of_remove_table(dev);
-}
-
 static int imx8m_ddrc_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -419,7 +414,7 @@  static int imx8m_ddrc_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	ret = dev_pm_opp_of_add_table(dev);
+	ret = devm_pm_opp_of_add_table(dev);
 	if (ret < 0) {
 		dev_err(dev, "failed to get OPP table\n");
 		return ret;
@@ -427,12 +422,11 @@  static int imx8m_ddrc_probe(struct platform_device *pdev)
 
 	ret = imx8m_ddrc_check_opps(dev);
 	if (ret < 0)
-		goto err;
+		return ret;
 
 	priv->profile.polling_ms = 1000;
 	priv->profile.target = imx8m_ddrc_target;
 	priv->profile.get_dev_status = imx8m_ddrc_get_dev_status;
-	priv->profile.exit = imx8m_ddrc_exit;
 	priv->profile.get_cur_freq = imx8m_ddrc_get_cur_freq;
 	priv->profile.initial_freq = clk_get_rate(priv->dram_core);
 
@@ -441,13 +435,8 @@  static int imx8m_ddrc_probe(struct platform_device *pdev)
 	if (IS_ERR(priv->devfreq)) {
 		ret = PTR_ERR(priv->devfreq);
 		dev_err(dev, "failed to add devfreq device: %d\n", ret);
-		goto err;
 	}
 
-	return 0;
-
-err:
-	dev_pm_opp_of_remove_table(dev);
 	return ret;
 }