Re: [PATCH] pwm-backlight: fix the panel power sequence

Path	csiph.com!eternal-september.org!feeder.eternal-september.org!aioe.org!bofh.it!news.nic.it!robomod
From	YH Huang <yh.huang@mediatek.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] pwm-backlight: fix the panel power sequence
Date	Wed, 14 Oct 2015 12:10:02 +0200
Message-ID	<qjraq-3DR-13@gated-at.bofh.it> (permalink)
References	<q9mc1-7pI-15@gated-at.bofh.it>
X-Original-To	Thierry Reding <thierry.reding@gmail.com>
X-Listener-Flag	11101
Content-Type	text/plain; charset="UTF-8"
X-Mailer	Evolution 3.2.3-0ubuntu6
Content-Transfer-Encoding	7bit
MIME-Version	1.0
X-Mtk	N
Sender	robomod@news.nic.it
List-ID	<linux-kernel.vger.kernel.org>
X-Mailing-List	linux-kernel@vger.kernel.org
Approved	robomod@news.nic.it
Lines	78
Organization	linux.* mail to news gateway
X-Original-Cc	Jingoo Han <jingoohan1@gmail.com>, Lee Jones <lee.jones@linaro.org>, Matthias Brugger <matthias.bgg@gmail.com>, Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>, Tomi Valkeinen <tomi.valkeinen@ti.com>, <linux-pwm@vger.kernel.org>, <linux-fbdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <linux-mediatek@lists.infradead.org>, Sascha Hauer <kernel@pengutronix.de>, <yingjoe.chen@mediatek.com>, <yh.huang@mediatek.com>
X-Original-Date	Wed, 14 Oct 2015 18:01:15 +0800
X-Original-Message-ID	<1444816875.31675.2.camel@mtksdaap41>
X-Original-References	<1442414556-32381-1-git-send-email-yh.huang@mediatek.com>
X-Original-Sender	linux-kernel-owner@vger.kernel.org
Xref	csiph.com linux.kernel:1246480

Show key headers only | View raw

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);


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

Re: [PATCH] pwm-backlight: fix the panel power sequence YH Huang <yh.huang@mediatek.com> - 2015-10-14 12:10 +0200
  Re: [PATCH] pwm-backlight: fix the panel power sequence Lee Jones <lee.jones@linaro.org> - 2015-10-14 14:30 +0200

csiph-web