From: YH Huang <yh.huang@mediatek.com>
To: linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2] pwm-backlight: fix the panel power sequence
Date: Thu, 22 Oct 2015 15:12:30 +0000 [thread overview]
Message-ID: <1445526750.27586.8.camel@mtksdaap41> (raw)
In-Reply-To: <1444988219.3541.3.camel@pengutronix.de>
On Fri, 2015-10-16 at 11:36 +0200, Philipp Zabel wrote:
> Am Freitag, den 16.10.2015, 17:17 +0800 schrieb YH Huang:
> > 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.
>
> Could you also have a look at the "pwm-backlight: Avoid backlight
> flicker when probed from DT" patch?
> I think in case of a panel left enabled by the bootloader, your patch
> will disable the backlight for a short time.
>
> best regards
> Philipp
>
In the case of the panel disabled by the bootloader,
your patch still has the following code and always enables the backlight
in the probe function.
pb->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
- GPIOD_OUT_HIGH);
What do you think if I remove these two lines in my patch?
if (pb->enable_gpio)
gpiod_direction_output(pb->enable_gpio, 0);
Regards,
YH Huang
next prev parent reply other threads:[~2015-10-22 15:12 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-16 9:17 [PATCH v2] pwm-backlight: fix the panel power sequence YH Huang
2015-10-16 9:36 ` Philipp Zabel
2015-10-22 15:12 ` YH Huang [this message]
2015-10-29 15:40 ` Philipp Zabel
2015-10-30 7:41 ` YH Huang
2015-10-30 10:34 ` Philipp Zabel
2015-11-03 8:11 ` YH Huang
2015-11-03 11:08 ` Philipp Zabel
2015-11-04 1:47 ` YH Huang
2015-11-05 9:40 ` Philipp Zabel
2015-11-06 8:31 ` YH Huang
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