From mboxrd@z Thu Jan 1 00:00:00 1970 From: Petr Cvek Subject: [PATCH v3 09/26] ARM: pxa: magician: Optimize powerup delays for Samsung LCD Date: Thu, 17 Sep 2015 06:57:35 +0200 Message-ID: <55FA483F.1040202@tul.cz> References: Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-2 Content-Transfer-Encoding: 7bit Return-path: Received: from bubo.tul.cz ([147.230.16.1]:37068 "EHLO bubo.tul.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751857AbbIQE5n (ORCPT ); Thu, 17 Sep 2015 00:57:43 -0400 In-Reply-To: Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: robert.jarzmik@free.fr, philipp.zabel@gmail.com, daniel@zonque.org, haojian.zhuang@gmail.com, cooloney@gmail.com, rpurdie@rpsys.net, j.anaszewski@samsung.com, linux@arm.linux.org.uk, sre@kernel.org, dbaryshkov@gmail.com, lee.jones@linaro.org, sameo@linux.intel.com, dwmw2@infradead.org, arnd@arndb.de, g.liakhovetski@gmx.de Cc: linux-leds@vger.kernel.org, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Delays for the Samsung LCD are greater than needed. These values were extracted from a datasheet. Signed-off-by: Petr Cvek --- arch/arm/mach-pxa/magician.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) diff --git a/arch/arm/mach-pxa/magician.c b/arch/arm/mach-pxa/magician.c index d78fc3a..14d1f55 100644 --- a/arch/arm/mach-pxa/magician.c +++ b/arch/arm/mach-pxa/magician.c @@ -366,21 +366,19 @@ static void samsung_lcd_power(int on, struct fb_var_screeninfo *si) gpio_set_value(GPIO75_MAGICIAN_SAMSUNG_POWER, 1); else gpio_set_value(EGPIO_MAGICIAN_LCD_POWER, 1); - mdelay(10); + mdelay(6); gpio_set_value(GPIO106_MAGICIAN_LCD_DCDC_NRESET, 1); - mdelay(10); + mdelay(6); /* Avdd -> Voff >5ms */ gpio_set_value(GPIO104_MAGICIAN_LCD_VOFF_EN, 1); - mdelay(30); + mdelay(16); /* Voff -> Von >(5+10)ms */ gpio_set_value(GPIO105_MAGICIAN_LCD_VON_EN, 1); - mdelay(10); } else { - mdelay(10); gpio_set_value(GPIO105_MAGICIAN_LCD_VON_EN, 0); - mdelay(30); + mdelay(16); gpio_set_value(GPIO104_MAGICIAN_LCD_VOFF_EN, 0); - mdelay(10); + mdelay(6); gpio_set_value(GPIO106_MAGICIAN_LCD_DCDC_NRESET, 0); - mdelay(10); + mdelay(6); if (system_rev < 3) gpio_set_value(GPIO75_MAGICIAN_SAMSUNG_POWER, 0); else -- 1.7.12.1