From 82d607a727228da0cb333adc7d072e9eb23c26db Mon Sep 17 00:00:00 2001 From: Liu Ying Date: Mon, 3 Sep 2012 15:30:55 +0800 Subject: ENGR00223794 MX6 SabreSD:Enable LVDS panel pwm backlight This patch enables pwm backlight for LVDS panel and stops using gpio backlight to align with kernel to avoid unstable backlight when booting into kernel, as kernel usually uses pwm backlight instead of gpio backlight. Following items are done to support this: 1) Add PWM1 and PWM2 controller base addresses. 2) Change PIN SD1_DAT3 mux from GPIO to PWM1_PWMO. 3) Set default backlight density to 50%. Signed-off-by: Liu Ying --- board/freescale/mx6q_sabresd/mx6q_sabresd.c | 27 +++++++++++++-------------- 1 file changed, 13 insertions(+), 14 deletions(-) (limited to 'board') diff --git a/board/freescale/mx6q_sabresd/mx6q_sabresd.c b/board/freescale/mx6q_sabresd/mx6q_sabresd.c index 3989b239684..92e3463c070 100644 --- a/board/freescale/mx6q_sabresd/mx6q_sabresd.c +++ b/board/freescale/mx6q_sabresd/mx6q_sabresd.c @@ -33,6 +33,7 @@ #endif #if defined(CONFIG_VIDEO_MX5) +#include #include #include #include @@ -99,6 +100,11 @@ unsigned short colormap[65536]; unsigned short colormap[16777216]; #endif +static struct pwm_device pwm0 = { + .pwm_id = 0, + .pwmo_invert = 0, +}; + static int di = 1; extern int ipuv3_fb_init(struct fb_videomode *mode, int di, @@ -1373,31 +1379,24 @@ void lcd_enable(void) */ g_ipu_hw_rev = IPUV3_HW_REV_IPUV3H; + imx_pwm_config(pwm0, 25000, 50000); + imx_pwm_enable(pwm0); + #if defined CONFIG_MX6Q - /* GPIO backlight */ - mxc_iomux_v3_setup_pad(MX6Q_PAD_SD1_DAT3__GPIO_1_21); + /* PWM backlight */ + mxc_iomux_v3_setup_pad(MX6Q_PAD_SD1_DAT3__PWM1_PWMO); /* LVDS panel CABC_EN0 */ mxc_iomux_v3_setup_pad(MX6Q_PAD_NANDF_CS2__GPIO_6_15); /* LVDS panel CABC_EN1 */ mxc_iomux_v3_setup_pad(MX6Q_PAD_NANDF_CS3__GPIO_6_16); #elif defined CONFIG_MX6DL - /* GPIO backlight */ - mxc_iomux_v3_setup_pad(MX6DL_PAD_SD1_DAT3__GPIO_1_21); + /* PWM backlight */ + mxc_iomux_v3_setup_pad(MX6DL_PAD_SD1_DAT3__PWM1_PWMO); /* LVDS panel CABC_EN0 */ mxc_iomux_v3_setup_pad(MX6DL_PAD_NANDF_CS2__GPIO_6_15); /* LVDS panel CABC_EN1 */ mxc_iomux_v3_setup_pad(MX6DL_PAD_NANDF_CS3__GPIO_6_16); #endif - - /* Set GPIO backlight to high. */ - reg = readl(GPIO1_BASE_ADDR + GPIO_GDIR); - reg |= (1 << 21); - writel(reg, GPIO1_BASE_ADDR + GPIO_GDIR); - - reg = readl(GPIO1_BASE_ADDR + GPIO_DR); - reg |= (1 << 21); - writel(reg, GPIO1_BASE_ADDR + GPIO_DR); - /* * Set LVDS panel CABC_EN0 to low to disable * CABC function. This function will turn backlight -- cgit v1.2.3