From: Pavel Machek <pavel@ucw.cz>
To: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Cc: Thierry Reding <thierry.reding@gmail.com>,
Lee Jones <lee.jones@linaro.org>,
Daniel Thompson <daniel.thompson@linaro.org>,
Jingoo Han <jingoohan1@gmail.com>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
Rob Herring <robh+dt@kernel.org>,
Richard Purdie <rpurdie@rpsys.net>,
Jacek Anaszewski <jacek.anaszewski@gmail.com>,
Heiko Stuebner <heiko@sntech.de>,
linux-pwm@vger.kernel.org, linux-fbdev@vger.kernel.org,
linux-kernel@vger.kernel.org, groeck@chromium.org,
linux-rockchip@lists.infradead.org
Subject: Re: [PATCH v3 5/5] ARM: dts: rockchip: set PWM delay backlight settings for Minnie
Date: Thu, 20 Jul 2017 08:10:38 +0000 [thread overview]
Message-ID: <20170720081038.GD13103@amd> (raw)
In-Reply-To: <20170717212811.25374-5-enric.balletbo@collabora.com>
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On Mon 2017-07-17 23:28:11, Enric Balletbo i Serra wrote:
> The minnie devices comes with an AUO B101EAN01 panel which is different
> from default veyron devices, thus the power on/off timing sequence is
> slightly different. The datasheet specifies a pwm delay of 200 ms, so
> update the PMW delay proprieties accordingly.
Wait a wait a moment!
> --- a/arch/arm/boot/dts/rk3288-veyron-minnie.dts
> +++ b/arch/arm/boot/dts/rk3288-veyron-minnie.dts
> @@ -123,6 +123,8 @@
> 240 241 242 243 244 245 246 247
> 248 249 250 251 252 253 254 255>;
> power-supply = <&backlight_regulator>;
> + post-pwm-on-delay-us = <20000>;
-us = <20 000>;
This is not 200 msec.
Plus, it is quite anti-social to do udelay(200 000).
Plus, it is very anti-socifal to use udelay_range(200msec,
400msec).
Whoever told you udelay_range is good thing to use -- it is not, and
it is certainly not worth making user wait 200msec more!
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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WARNING: multiple messages have this Message-ID (diff)
From: Pavel Machek <pavel@ucw.cz>
To: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Cc: Thierry Reding <thierry.reding@gmail.com>,
Lee Jones <lee.jones@linaro.org>,
Daniel Thompson <daniel.thompson@linaro.org>,
Jingoo Han <jingoohan1@gmail.com>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
Rob Herring <robh+dt@kernel.org>,
Richard Purdie <rpurdie@rpsys.net>,
Jacek Anaszewski <jacek.anaszewski@gmail.com>,
Heiko Stuebner <heiko@sntech.de>,
linux-pwm@vger.kernel.org, linux-fbdev@vger.kernel.org,
linux-kernel@vger.kernel.org, groeck@chromium.org,
linux-rockchip@lists.infradead.org
Subject: Re: [PATCH v3 5/5] ARM: dts: rockchip: set PWM delay backlight settings for Minnie
Date: Thu, 20 Jul 2017 10:10:38 +0200 [thread overview]
Message-ID: <20170720081038.GD13103@amd> (raw)
In-Reply-To: <20170717212811.25374-5-enric.balletbo@collabora.com>
[-- Attachment #1: Type: text/plain, Size: 1104 bytes --]
On Mon 2017-07-17 23:28:11, Enric Balletbo i Serra wrote:
> The minnie devices comes with an AUO B101EAN01 panel which is different
> from default veyron devices, thus the power on/off timing sequence is
> slightly different. The datasheet specifies a pwm delay of 200 ms, so
> update the PMW delay proprieties accordingly.
Wait a wait a moment!
> --- a/arch/arm/boot/dts/rk3288-veyron-minnie.dts
> +++ b/arch/arm/boot/dts/rk3288-veyron-minnie.dts
> @@ -123,6 +123,8 @@
> 240 241 242 243 244 245 246 247
> 248 249 250 251 252 253 254 255>;
> power-supply = <&backlight_regulator>;
> + post-pwm-on-delay-us = <20000>;
-us = <20 000>;
This is not 200 msec.
Plus, it is quite anti-social to do udelay(200 000).
Plus, it is very anti-socifal to use udelay_range(200msec,
400msec).
Whoever told you udelay_range is good thing to use -- it is not, and
it is certainly not worth making user wait 200msec more!
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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next prev parent reply other threads:[~2017-07-20 8:10 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-17 21:28 [PATCH v3 1/5] pwm-backlight: enable/disable the PWM before/after LCD enable toggle Enric Balletbo i Serra
2017-07-17 21:28 ` Enric Balletbo i Serra
2017-07-17 21:28 ` [PATCH v3 2/5] dt-bindings: pwm-backlight: add PWM delay proprieties Enric Balletbo i Serra
2017-07-17 21:28 ` Enric Balletbo i Serra
2017-07-20 8:04 ` Pavel Machek
2017-07-20 8:04 ` Pavel Machek
2017-07-17 21:28 ` [PATCH v3 3/5] pwm-backlight: add support for PWM delays proprieties Enric Balletbo i Serra
2017-07-17 21:28 ` Enric Balletbo i Serra
2017-07-18 9:38 ` Daniel Thompson
2017-07-18 9:38 ` Daniel Thompson
2017-07-20 8:06 ` Pavel Machek
2017-07-20 8:06 ` Pavel Machek
2017-07-20 10:37 ` Daniel Thompson
2017-07-20 10:37 ` Daniel Thompson
2017-07-20 11:05 ` Pavel Machek
2017-07-20 11:05 ` Pavel Machek
2017-08-08 8:11 ` Pavel Machek
2017-08-08 8:11 ` Pavel Machek
2017-07-17 21:28 ` [PATCH v3 4/5] ARM: dts: rockchip: set PWM delay backlight settings for Veyron Enric Balletbo i Serra
2017-07-17 21:28 ` Enric Balletbo i Serra
2017-07-17 21:28 ` [PATCH v3 5/5] ARM: dts: rockchip: set PWM delay backlight settings for Minnie Enric Balletbo i Serra
2017-07-17 21:28 ` Enric Balletbo i Serra
2017-07-20 8:10 ` Pavel Machek [this message]
2017-07-20 8:10 ` Pavel Machek
2017-07-20 10:03 ` Enric Balletbo Serra
2017-07-20 10:03 ` Enric Balletbo Serra
2017-07-20 10:13 ` Pavel Machek
2017-07-20 10:13 ` Pavel Machek
2017-07-18 9:34 ` [PATCH v3 1/5] pwm-backlight: enable/disable the PWM before/after LCD enable toggle Daniel Thompson
2017-07-18 9:34 ` Daniel Thompson
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