* [PATCH] pwm-backlight: fix the panel power sequence
@ 2015-09-16 14:42 YH Huang
2015-10-14 10:01 ` YH Huang
0 siblings, 1 reply; 3+ messages in thread
From: YH Huang @ 2015-09-16 14:42 UTC (permalink / raw)
To: linux-arm-kernel
In order to match the panel power sequence, disable the enable_gpio
in the probe function. Also, reorder the code in the power_on and
power_off function to match the timing.
Signed-off-by: YH Huang <yh.huang@mediatek.com>
---
drivers/video/backlight/pwm_bl.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index eff379b..99eca1e 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c
@@ -54,10 +54,11 @@ static void pwm_backlight_power_on(struct pwm_bl_data *pb, int brightness)
if (err < 0)
dev_err(pb->dev, "failed to enable power supply\n");
+ pwm_enable(pb->pwm);
+
if (pb->enable_gpio)
gpiod_set_value(pb->enable_gpio, 1);
- pwm_enable(pb->pwm);
pb->enabled = true;
}
@@ -66,12 +67,12 @@ static void pwm_backlight_power_off(struct pwm_bl_data *pb)
if (!pb->enabled)
return;
- pwm_config(pb->pwm, 0, pb->period);
- pwm_disable(pb->pwm);
-
if (pb->enable_gpio)
gpiod_set_value(pb->enable_gpio, 0);
+ pwm_config(pb->pwm, 0, pb->period);
+ pwm_disable(pb->pwm);
+
regulator_disable(pb->power_supply);
pb->enabled = false;
}
@@ -241,8 +242,7 @@ static int pwm_backlight_probe(struct platform_device *pdev)
pb->dev = &pdev->dev;
pb->enabled = false;
- pb->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
- GPIOD_OUT_HIGH);
+ pb->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable");
if (IS_ERR(pb->enable_gpio)) {
ret = PTR_ERR(pb->enable_gpio);
goto err_alloc;
@@ -264,6 +264,9 @@ static int pwm_backlight_probe(struct platform_device *pdev)
pb->enable_gpio = gpio_to_desc(data->enable_gpio);
}
+ if (pb->enable_gpio)
+ gpiod_direction_output(pb->enable_gpio, 0);
+
pb->power_supply = devm_regulator_get(&pdev->dev, "power");
if (IS_ERR(pb->power_supply)) {
ret = PTR_ERR(pb->power_supply);
--
1.7.9.5
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH] pwm-backlight: fix the panel power sequence
2015-09-16 14:42 [PATCH] pwm-backlight: fix the panel power sequence YH Huang
@ 2015-10-14 10:01 ` YH Huang
2015-10-14 12:27 ` Lee Jones
0 siblings, 1 reply; 3+ messages in thread
From: YH Huang @ 2015-10-14 10:01 UTC (permalink / raw)
To: linux-arm-kernel
Hi all,
If you have any suggestion, please let me know.
Thanks.
Regards,
YH Huang
On Wed, 2015-09-16 at 22:42 +0800, YH Huang wrote:
> In order to match the panel power sequence, disable the enable_gpio
> in the probe function. Also, reorder the code in the power_on and
> power_off function to match the timing.
>
> Signed-off-by: YH Huang <yh.huang@mediatek.com>
> ---
> drivers/video/backlight/pwm_bl.c | 15 +++++++++------
> 1 file changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
> index eff379b..99eca1e 100644
> --- a/drivers/video/backlight/pwm_bl.c
> +++ b/drivers/video/backlight/pwm_bl.c
> @@ -54,10 +54,11 @@ static void pwm_backlight_power_on(struct pwm_bl_data *pb, int brightness)
> if (err < 0)
> dev_err(pb->dev, "failed to enable power supply\n");
>
> + pwm_enable(pb->pwm);
> +
> if (pb->enable_gpio)
> gpiod_set_value(pb->enable_gpio, 1);
>
> - pwm_enable(pb->pwm);
> pb->enabled = true;
> }
>
> @@ -66,12 +67,12 @@ static void pwm_backlight_power_off(struct pwm_bl_data *pb)
> if (!pb->enabled)
> return;
>
> - pwm_config(pb->pwm, 0, pb->period);
> - pwm_disable(pb->pwm);
> -
> if (pb->enable_gpio)
> gpiod_set_value(pb->enable_gpio, 0);
>
> + pwm_config(pb->pwm, 0, pb->period);
> + pwm_disable(pb->pwm);
> +
> regulator_disable(pb->power_supply);
> pb->enabled = false;
> }
> @@ -241,8 +242,7 @@ static int pwm_backlight_probe(struct platform_device *pdev)
> pb->dev = &pdev->dev;
> pb->enabled = false;
>
> - pb->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
> - GPIOD_OUT_HIGH);
> + pb->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable");
> if (IS_ERR(pb->enable_gpio)) {
> ret = PTR_ERR(pb->enable_gpio);
> goto err_alloc;
> @@ -264,6 +264,9 @@ static int pwm_backlight_probe(struct platform_device *pdev)
> pb->enable_gpio = gpio_to_desc(data->enable_gpio);
> }
>
> + if (pb->enable_gpio)
> + gpiod_direction_output(pb->enable_gpio, 0);
> +
> pb->power_supply = devm_regulator_get(&pdev->dev, "power");
> if (IS_ERR(pb->power_supply)) {
> ret = PTR_ERR(pb->power_supply);
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH] pwm-backlight: fix the panel power sequence
2015-10-14 10:01 ` YH Huang
@ 2015-10-14 12:27 ` Lee Jones
0 siblings, 0 replies; 3+ messages in thread
From: Lee Jones @ 2015-10-14 12:27 UTC (permalink / raw)
To: linux-arm-kernel
On Wed, 14 Oct 2015, YH Huang wrote:
> Hi all,
>
> If you have any suggestion, please let me know.
> Thanks.
Please don't do that.
If you think the patch has fallen through the gaps, please just RESEND
it, like [RESEND vX] $subject.
> On Wed, 2015-09-16 at 22:42 +0800, YH Huang wrote:
> > In order to match the panel power sequence, disable the enable_gpio
> > in the probe function. Also, reorder the code in the power_on and
> > power_off function to match the timing.
> >
> > Signed-off-by: YH Huang <yh.huang@mediatek.com>
> > ---
> > drivers/video/backlight/pwm_bl.c | 15 +++++++++------
> > 1 file changed, 9 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
> > index eff379b..99eca1e 100644
> > --- a/drivers/video/backlight/pwm_bl.c
> > +++ b/drivers/video/backlight/pwm_bl.c
> > @@ -54,10 +54,11 @@ static void pwm_backlight_power_on(struct pwm_bl_data *pb, int brightness)
> > if (err < 0)
> > dev_err(pb->dev, "failed to enable power supply\n");
> >
> > + pwm_enable(pb->pwm);
> > +
> > if (pb->enable_gpio)
> > gpiod_set_value(pb->enable_gpio, 1);
> >
> > - pwm_enable(pb->pwm);
> > pb->enabled = true;
> > }
> >
> > @@ -66,12 +67,12 @@ static void pwm_backlight_power_off(struct pwm_bl_data *pb)
> > if (!pb->enabled)
> > return;
> >
> > - pwm_config(pb->pwm, 0, pb->period);
> > - pwm_disable(pb->pwm);
> > -
> > if (pb->enable_gpio)
> > gpiod_set_value(pb->enable_gpio, 0);
> >
> > + pwm_config(pb->pwm, 0, pb->period);
> > + pwm_disable(pb->pwm);
> > +
> > regulator_disable(pb->power_supply);
> > pb->enabled = false;
> > }
> > @@ -241,8 +242,7 @@ static int pwm_backlight_probe(struct platform_device *pdev)
> > pb->dev = &pdev->dev;
> > pb->enabled = false;
> >
> > - pb->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
> > - GPIOD_OUT_HIGH);
> > + pb->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable");
> > if (IS_ERR(pb->enable_gpio)) {
> > ret = PTR_ERR(pb->enable_gpio);
> > goto err_alloc;
> > @@ -264,6 +264,9 @@ static int pwm_backlight_probe(struct platform_device *pdev)
> > pb->enable_gpio = gpio_to_desc(data->enable_gpio);
> > }
> >
> > + if (pb->enable_gpio)
> > + gpiod_direction_output(pb->enable_gpio, 0);
> > +
> > pb->power_supply = devm_regulator_get(&pdev->dev, "power");
> > if (IS_ERR(pb->power_supply)) {
> > ret = PTR_ERR(pb->power_supply);
>
>
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
^ permalink raw reply [flat|nested] 3+ messages in thread
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2015-09-16 14:42 [PATCH] pwm-backlight: fix the panel power sequence YH Huang
2015-10-14 10:01 ` YH Huang
2015-10-14 12:27 ` Lee Jones
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