From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755440AbcIEJQy (ORCPT ); Mon, 5 Sep 2016 05:16:54 -0400 Received: from mo4-p00-ob.smtp.rzone.de ([81.169.146.219]:19983 "EHLO mo4-p00-ob.smtp.rzone.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754322AbcIEJQu (ORCPT ); Mon, 5 Sep 2016 05:16:50 -0400 X-RZG-AUTH: :JGIXVUS7cutRB/49FwqZ7WcecEarQROEYabkiUo6mSAGQ+qKID82PDV0h5M= X-RZG-CLASS-ID: mo00 From: "H. Nikolaus Schaller" To: =?UTF-8?q?Beno=C3=AEt=20Cousson?= , Tony Lindgren , Rob Herring , Mark Rutland , Russell King , marek@goldelico.com Cc: linux-omap@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, letux-kernel@openphoenux.org, "H. Nikolaus Schaller" Subject: [PATCH] ARM: dts: omap3-gta04: reduce panel backlight PWM frequency to 83Hz Date: Mon, 5 Sep 2016 11:16:38 +0200 Message-Id: <954d43b570092fe92b8b49cf8f475c027d3d8342.1473066997.git.hns@goldelico.com> X-Mailer: git-send-email 2.7.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This helps to get 100% intensity closer to "always on". It compensates for an effect of dmtimer which at 100% still emits short "off" impulses and the startup-time of the DC/DC converter makes backlight intensity not reach full scale. The lower the PWM frequency is, the smaller is this effect. Signed-off-by: H. Nikolaus Schaller --- arch/arm/boot/dts/omap3-gta04.dtsi | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/boot/dts/omap3-gta04.dtsi b/arch/arm/boot/dts/omap3-gta04.dtsi index c09a057..94f12dd 100644 --- a/arch/arm/boot/dts/omap3-gta04.dtsi +++ b/arch/arm/boot/dts/omap3-gta04.dtsi @@ -102,7 +102,7 @@ backlight { compatible = "pwm-backlight"; - pwms = <&pwm11 0 2000000 0>; + pwms = <&pwm11 0 12000000 0>; pwm-names = "backlight"; brightness-levels = <0 11 20 30 40 50 60 70 80 90 100>; default-brightness-level = <9>; /* => 90 */ -- 2.7.3