linux-fbdev.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
* [PATCH v2] video: backlight: Make use of the helper function dev_err_probe()
@ 2021-09-17 12:53 Cai Huoqing
  2021-09-17 13:15 ` Daniel Thompson
  0 siblings, 1 reply; 3+ messages in thread
From: Cai Huoqing @ 2021-09-17 12:53 UTC (permalink / raw)
  To: caihuoqing
  Cc: Lee Jones, Daniel Thompson, Jingoo Han, dri-devel, linux-fbdev,
	linux-kernel

When possible use dev_err_probe help to properly deal with the
PROBE_DEFER error, the benefit is that DEFER issue will be logged
in the devices_deferred debugfs file.
Using dev_err_probe() can reduce code size, and the error value
gets printed.

Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
---
v1->v2: backlight patches are handled in one

 drivers/video/backlight/bd6107.c      | 16 +++++--------
 drivers/video/backlight/l4f00242t03.c | 34 ++++++++++-----------------
 2 files changed, 19 insertions(+), 31 deletions(-)

diff --git a/drivers/video/backlight/bd6107.c b/drivers/video/backlight/bd6107.c
index 515184fbe33a..e21b793302a2 100644
--- a/drivers/video/backlight/bd6107.c
+++ b/drivers/video/backlight/bd6107.c
@@ -120,7 +120,6 @@ static int bd6107_probe(struct i2c_client *client,
 	struct backlight_device *backlight;
 	struct backlight_properties props;
 	struct bd6107 *bd;
-	int ret;
 
 	if (pdata == NULL) {
 		dev_err(&client->dev, "No platform data\n");
@@ -148,11 +147,9 @@ static int bd6107_probe(struct i2c_client *client,
 	 * the reset.
 	 */
 	bd->reset = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_HIGH);
-	if (IS_ERR(bd->reset)) {
-		dev_err(&client->dev, "unable to request reset GPIO\n");
-		ret = PTR_ERR(bd->reset);
-		return ret;
-	}
+	if (IS_ERR(bd->reset))
+		return dev_err_probe(&client->dev, PTR_ERR(bd->reset),
+				     "unable to request reset GPIO\n");
 
 	memset(&props, 0, sizeof(props));
 	props.type = BACKLIGHT_RAW;
@@ -164,10 +161,9 @@ static int bd6107_probe(struct i2c_client *client,
 					      dev_name(&client->dev),
 					      &bd->client->dev, bd,
 					      &bd6107_backlight_ops, &props);
-	if (IS_ERR(backlight)) {
-		dev_err(&client->dev, "failed to register backlight\n");
-		return PTR_ERR(backlight);
-	}
+	if (IS_ERR(backlight))
+		return dev_err_probe(&client->dev, PTR_ERR(backlight),
+				     "failed to register backlight\n");
 
 	backlight_update_status(backlight);
 	i2c_set_clientdata(client, backlight);
diff --git a/drivers/video/backlight/l4f00242t03.c b/drivers/video/backlight/l4f00242t03.c
index 46f97d1c3d21..8d81d4dec3c6 100644
--- a/drivers/video/backlight/l4f00242t03.c
+++ b/drivers/video/backlight/l4f00242t03.c
@@ -179,37 +179,29 @@ static int l4f00242t03_probe(struct spi_device *spi)
 	priv->spi = spi;
 
 	priv->reset = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_HIGH);
-	if (IS_ERR(priv->reset)) {
-		dev_err(&spi->dev,
-			"Unable to get the lcd l4f00242t03 reset gpio.\n");
-		return PTR_ERR(priv->reset);
-	}
+	if (IS_ERR(priv->reset))
+		return dev_err_probe(&spi->dev, PTR_ERR(priv->reset),
+				     "Unable to get the lcd l4f00242t03 reset gpio.\n");
 	gpiod_set_consumer_name(priv->reset, "lcd l4f00242t03 reset");
 
 	priv->enable = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW);
-	if (IS_ERR(priv->enable)) {
-		dev_err(&spi->dev,
-			"Unable to get the lcd l4f00242t03 data en gpio.\n");
-		return PTR_ERR(priv->enable);
-	}
+	if (IS_ERR(priv->enable))
+		return dev_err_probe(&spi->dev, PTR_ERR(priv->enable),
+				     "Unable to get the lcd l4f00242t03 data en gpio.\n");
 	gpiod_set_consumer_name(priv->enable, "lcd l4f00242t03 data enable");
 
 	priv->io_reg = devm_regulator_get(&spi->dev, "vdd");
-	if (IS_ERR(priv->io_reg)) {
-		dev_err(&spi->dev, "%s: Unable to get the IO regulator\n",
-		       __func__);
-		return PTR_ERR(priv->io_reg);
-	}
+	if (IS_ERR(priv->io_reg))
+		return dev_err_probe(&spi->dev, PTR_ERR(priv->io_reg),
+				     "%s: Unable to get the IO regulator\n", __func__);
 
 	priv->core_reg = devm_regulator_get(&spi->dev, "vcore");
-	if (IS_ERR(priv->core_reg)) {
-		dev_err(&spi->dev, "%s: Unable to get the core regulator\n",
-		       __func__);
-		return PTR_ERR(priv->core_reg);
-	}
+	if (IS_ERR(priv->core_reg))
+		return dev_err_probe(&spi->dev, PTR_ERR(priv->core_reg),
+				     "%s: Unable to get the core regulator\n", __func__);
 
 	priv->ld = devm_lcd_device_register(&spi->dev, "l4f00242t03", &spi->dev,
-					priv, &l4f_ops);
+					    priv, &l4f_ops);
 	if (IS_ERR(priv->ld))
 		return PTR_ERR(priv->ld);
 
-- 
2.25.1


^ permalink raw reply related	[flat|nested] 3+ messages in thread

* Re: [PATCH v2] video: backlight: Make use of the helper function dev_err_probe()
  2021-09-17 12:53 [PATCH v2] video: backlight: Make use of the helper function dev_err_probe() Cai Huoqing
@ 2021-09-17 13:15 ` Daniel Thompson
  2021-09-17 13:30   ` Cai Huoqing
  0 siblings, 1 reply; 3+ messages in thread
From: Daniel Thompson @ 2021-09-17 13:15 UTC (permalink / raw)
  To: Cai Huoqing; +Cc: Lee Jones, Jingoo Han, dri-devel, linux-fbdev, linux-kernel

On Fri, Sep 17, 2021 at 08:53:23PM +0800, Cai Huoqing wrote:
> When possible use dev_err_probe help to properly deal with the
> PROBE_DEFER error, the benefit is that DEFER issue will be logged
> in the devices_deferred debugfs file.
> Using dev_err_probe() can reduce code size, and the error value
> gets printed.
> 
> Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
> ---
> v1->v2: backlight patches are handled in one

This appears to leave a lot of backlight drivers with the same code
pattern that are not updated. As my last e-mail, please can you explain
why you selected these drivers and no others?

I would expect this type of change to be made with the assistance of a
script to automatically help you identify and change the code patterns
you are targetting. This would allow you to update all the backlight
drivers at once.


Daniel.


>  drivers/video/backlight/bd6107.c      | 16 +++++--------
>  drivers/video/backlight/l4f00242t03.c | 34 ++++++++++-----------------
>  2 files changed, 19 insertions(+), 31 deletions(-)
> 
> diff --git a/drivers/video/backlight/bd6107.c b/drivers/video/backlight/bd6107.c
> index 515184fbe33a..e21b793302a2 100644
> --- a/drivers/video/backlight/bd6107.c
> +++ b/drivers/video/backlight/bd6107.c
> @@ -120,7 +120,6 @@ static int bd6107_probe(struct i2c_client *client,
>  	struct backlight_device *backlight;
>  	struct backlight_properties props;
>  	struct bd6107 *bd;
> -	int ret;
>  
>  	if (pdata == NULL) {
>  		dev_err(&client->dev, "No platform data\n");
> @@ -148,11 +147,9 @@ static int bd6107_probe(struct i2c_client *client,
>  	 * the reset.
>  	 */
>  	bd->reset = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_HIGH);
> -	if (IS_ERR(bd->reset)) {
> -		dev_err(&client->dev, "unable to request reset GPIO\n");
> -		ret = PTR_ERR(bd->reset);
> -		return ret;
> -	}
> +	if (IS_ERR(bd->reset))
> +		return dev_err_probe(&client->dev, PTR_ERR(bd->reset),
> +				     "unable to request reset GPIO\n");
>  
>  	memset(&props, 0, sizeof(props));
>  	props.type = BACKLIGHT_RAW;
> @@ -164,10 +161,9 @@ static int bd6107_probe(struct i2c_client *client,
>  					      dev_name(&client->dev),
>  					      &bd->client->dev, bd,
>  					      &bd6107_backlight_ops, &props);
> -	if (IS_ERR(backlight)) {
> -		dev_err(&client->dev, "failed to register backlight\n");
> -		return PTR_ERR(backlight);
> -	}
> +	if (IS_ERR(backlight))
> +		return dev_err_probe(&client->dev, PTR_ERR(backlight),
> +				     "failed to register backlight\n");
>  
>  	backlight_update_status(backlight);
>  	i2c_set_clientdata(client, backlight);
> diff --git a/drivers/video/backlight/l4f00242t03.c b/drivers/video/backlight/l4f00242t03.c
> index 46f97d1c3d21..8d81d4dec3c6 100644
> --- a/drivers/video/backlight/l4f00242t03.c
> +++ b/drivers/video/backlight/l4f00242t03.c
> @@ -179,37 +179,29 @@ static int l4f00242t03_probe(struct spi_device *spi)
>  	priv->spi = spi;
>  
>  	priv->reset = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_HIGH);
> -	if (IS_ERR(priv->reset)) {
> -		dev_err(&spi->dev,
> -			"Unable to get the lcd l4f00242t03 reset gpio.\n");
> -		return PTR_ERR(priv->reset);
> -	}
> +	if (IS_ERR(priv->reset))
> +		return dev_err_probe(&spi->dev, PTR_ERR(priv->reset),
> +				     "Unable to get the lcd l4f00242t03 reset gpio.\n");
>  	gpiod_set_consumer_name(priv->reset, "lcd l4f00242t03 reset");
>  
>  	priv->enable = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW);
> -	if (IS_ERR(priv->enable)) {
> -		dev_err(&spi->dev,
> -			"Unable to get the lcd l4f00242t03 data en gpio.\n");
> -		return PTR_ERR(priv->enable);
> -	}
> +	if (IS_ERR(priv->enable))
> +		return dev_err_probe(&spi->dev, PTR_ERR(priv->enable),
> +				     "Unable to get the lcd l4f00242t03 data en gpio.\n");
>  	gpiod_set_consumer_name(priv->enable, "lcd l4f00242t03 data enable");
>  
>  	priv->io_reg = devm_regulator_get(&spi->dev, "vdd");
> -	if (IS_ERR(priv->io_reg)) {
> -		dev_err(&spi->dev, "%s: Unable to get the IO regulator\n",
> -		       __func__);
> -		return PTR_ERR(priv->io_reg);
> -	}
> +	if (IS_ERR(priv->io_reg))
> +		return dev_err_probe(&spi->dev, PTR_ERR(priv->io_reg),
> +				     "%s: Unable to get the IO regulator\n", __func__);
>  
>  	priv->core_reg = devm_regulator_get(&spi->dev, "vcore");
> -	if (IS_ERR(priv->core_reg)) {
> -		dev_err(&spi->dev, "%s: Unable to get the core regulator\n",
> -		       __func__);
> -		return PTR_ERR(priv->core_reg);
> -	}
> +	if (IS_ERR(priv->core_reg))
> +		return dev_err_probe(&spi->dev, PTR_ERR(priv->core_reg),
> +				     "%s: Unable to get the core regulator\n", __func__);
>  
>  	priv->ld = devm_lcd_device_register(&spi->dev, "l4f00242t03", &spi->dev,
> -					priv, &l4f_ops);
> +					    priv, &l4f_ops);
>  	if (IS_ERR(priv->ld))
>  		return PTR_ERR(priv->ld);
>  
> -- 
> 2.25.1
> 

^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [PATCH v2] video: backlight: Make use of the helper function dev_err_probe()
  2021-09-17 13:15 ` Daniel Thompson
@ 2021-09-17 13:30   ` Cai Huoqing
  0 siblings, 0 replies; 3+ messages in thread
From: Cai Huoqing @ 2021-09-17 13:30 UTC (permalink / raw)
  To: Daniel Thompson
  Cc: Lee Jones, Jingoo Han, dri-devel, linux-fbdev, linux-kernel

On 17 9月 21 14:15:29, Daniel Thompson wrote:
> On Fri, Sep 17, 2021 at 08:53:23PM +0800, Cai Huoqing wrote:
> > When possible use dev_err_probe help to properly deal with the
> > PROBE_DEFER error, the benefit is that DEFER issue will be logged
> > in the devices_deferred debugfs file.
> > Using dev_err_probe() can reduce code size, and the error value
> > gets printed.
> > 
> > Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
> > ---
> > v1->v2: backlight patches are handled in one
> 
> This appears to leave a lot of backlight drivers with the same code
> pattern that are not updated. As my last e-mail, please can you explain
> why you selected these drivers and no others?
Thanks for you feedback.

I Just
grep devm_regulator_get/devm_gpiod_get -C 3|grep "dev_err(" -C 3

That help to find them,
and fix them one by one manually.
> 
> I would expect this type of change to be made with the assistance of a
> script to automatically help you identify and change the code patterns
> you are targetting. This would allow you to update all the backlight
> drivers at once.
Nice idea. I'll try.
Cai
> 
> 
> Daniel.
> 
> 
> >  drivers/video/backlight/bd6107.c      | 16 +++++--------
> >  drivers/video/backlight/l4f00242t03.c | 34 ++++++++++-----------------
> >  2 files changed, 19 insertions(+), 31 deletions(-)
> > 
> > diff --git a/drivers/video/backlight/bd6107.c b/drivers/video/backlight/bd6107.c
> > index 515184fbe33a..e21b793302a2 100644
> > --- a/drivers/video/backlight/bd6107.c
> > +++ b/drivers/video/backlight/bd6107.c
> > @@ -120,7 +120,6 @@ static int bd6107_probe(struct i2c_client *client,
> >  	struct backlight_device *backlight;
> >  	struct backlight_properties props;
> >  	struct bd6107 *bd;
> > -	int ret;
> >  
> >  	if (pdata == NULL) {
> >  		dev_err(&client->dev, "No platform data\n");
> > @@ -148,11 +147,9 @@ static int bd6107_probe(struct i2c_client *client,
> >  	 * the reset.
> >  	 */
> >  	bd->reset = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_HIGH);
> > -	if (IS_ERR(bd->reset)) {
> > -		dev_err(&client->dev, "unable to request reset GPIO\n");
> > -		ret = PTR_ERR(bd->reset);
> > -		return ret;
> > -	}
> > +	if (IS_ERR(bd->reset))
> > +		return dev_err_probe(&client->dev, PTR_ERR(bd->reset),
> > +				     "unable to request reset GPIO\n");
> >  
> >  	memset(&props, 0, sizeof(props));
> >  	props.type = BACKLIGHT_RAW;
> > @@ -164,10 +161,9 @@ static int bd6107_probe(struct i2c_client *client,
> >  					      dev_name(&client->dev),
> >  					      &bd->client->dev, bd,
> >  					      &bd6107_backlight_ops, &props);
> > -	if (IS_ERR(backlight)) {
> > -		dev_err(&client->dev, "failed to register backlight\n");
> > -		return PTR_ERR(backlight);
> > -	}
> > +	if (IS_ERR(backlight))
> > +		return dev_err_probe(&client->dev, PTR_ERR(backlight),
> > +				     "failed to register backlight\n");
> >  
> >  	backlight_update_status(backlight);
> >  	i2c_set_clientdata(client, backlight);
> > diff --git a/drivers/video/backlight/l4f00242t03.c b/drivers/video/backlight/l4f00242t03.c
> > index 46f97d1c3d21..8d81d4dec3c6 100644
> > --- a/drivers/video/backlight/l4f00242t03.c
> > +++ b/drivers/video/backlight/l4f00242t03.c
> > @@ -179,37 +179,29 @@ static int l4f00242t03_probe(struct spi_device *spi)
> >  	priv->spi = spi;
> >  
> >  	priv->reset = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_HIGH);
> > -	if (IS_ERR(priv->reset)) {
> > -		dev_err(&spi->dev,
> > -			"Unable to get the lcd l4f00242t03 reset gpio.\n");
> > -		return PTR_ERR(priv->reset);
> > -	}
> > +	if (IS_ERR(priv->reset))
> > +		return dev_err_probe(&spi->dev, PTR_ERR(priv->reset),
> > +				     "Unable to get the lcd l4f00242t03 reset gpio.\n");
> >  	gpiod_set_consumer_name(priv->reset, "lcd l4f00242t03 reset");
> >  
> >  	priv->enable = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW);
> > -	if (IS_ERR(priv->enable)) {
> > -		dev_err(&spi->dev,
> > -			"Unable to get the lcd l4f00242t03 data en gpio.\n");
> > -		return PTR_ERR(priv->enable);
> > -	}
> > +	if (IS_ERR(priv->enable))
> > +		return dev_err_probe(&spi->dev, PTR_ERR(priv->enable),
> > +				     "Unable to get the lcd l4f00242t03 data en gpio.\n");
> >  	gpiod_set_consumer_name(priv->enable, "lcd l4f00242t03 data enable");
> >  
> >  	priv->io_reg = devm_regulator_get(&spi->dev, "vdd");
> > -	if (IS_ERR(priv->io_reg)) {
> > -		dev_err(&spi->dev, "%s: Unable to get the IO regulator\n",
> > -		       __func__);
> > -		return PTR_ERR(priv->io_reg);
> > -	}
> > +	if (IS_ERR(priv->io_reg))
> > +		return dev_err_probe(&spi->dev, PTR_ERR(priv->io_reg),
> > +				     "%s: Unable to get the IO regulator\n", __func__);
> >  
> >  	priv->core_reg = devm_regulator_get(&spi->dev, "vcore");
> > -	if (IS_ERR(priv->core_reg)) {
> > -		dev_err(&spi->dev, "%s: Unable to get the core regulator\n",
> > -		       __func__);
> > -		return PTR_ERR(priv->core_reg);
> > -	}
> > +	if (IS_ERR(priv->core_reg))
> > +		return dev_err_probe(&spi->dev, PTR_ERR(priv->core_reg),
> > +				     "%s: Unable to get the core regulator\n", __func__);
> >  
> >  	priv->ld = devm_lcd_device_register(&spi->dev, "l4f00242t03", &spi->dev,
> > -					priv, &l4f_ops);
> > +					    priv, &l4f_ops);
> >  	if (IS_ERR(priv->ld))
> >  		return PTR_ERR(priv->ld);
> >  
> > -- 
> > 2.25.1
> > 

^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2021-09-17 13:30 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-09-17 12:53 [PATCH v2] video: backlight: Make use of the helper function dev_err_probe() Cai Huoqing
2021-09-17 13:15 ` Daniel Thompson
2021-09-17 13:30   ` Cai Huoqing

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).