From 6c51a3644e233bce171c19cec9cec77a77beada7 Mon Sep 17 00:00:00 2001 From: Marco Franchi Date: Wed, 8 Jun 2016 15:05:31 -0300 Subject: [PATCH] mx6sabresd: Allow LVDS backlight to be functional after a kernel reboot MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Currently the LVDS backlight does not work in U-Boot after a “reboot” comand in the kernel. This problem occurs because the kernel uses this pin in PWM mode and U-Boot does not configure the backlight pin as GPIO functionality. So fix the problem by explicitly configuring the backlight pin as GPIO in U-Boot. Signed-off-by: Marco Franchi Acked-by: Stefano Babic Tested-by: Fabio Estevam --- board/freescale/mx6sabresd/mx6sabresd.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) diff --git a/board/freescale/mx6sabresd/mx6sabresd.c b/board/freescale/mx6sabresd/mx6sabresd.c index 54ba36b535..0cf68097f4 100644 --- a/board/freescale/mx6sabresd/mx6sabresd.c +++ b/board/freescale/mx6sabresd/mx6sabresd.c @@ -177,13 +177,27 @@ static iomux_v3_cfg_t const rgb_pads[] = { MX6_PAD_DISP0_DAT21__IPU1_DISP0_DATA21 | MUX_PAD_CTRL(NO_PAD_CTRL), MX6_PAD_DISP0_DAT22__IPU1_DISP0_DATA22 | MUX_PAD_CTRL(NO_PAD_CTRL), MX6_PAD_DISP0_DAT23__IPU1_DISP0_DATA23 | MUX_PAD_CTRL(NO_PAD_CTRL), +}; + +static iomux_v3_cfg_t const bl_pads[] = { MX6_PAD_SD1_DAT3__GPIO1_IO21 | MUX_PAD_CTRL(NO_PAD_CTRL), }; +static void enable_backlight(void) +{ + imx_iomux_v3_setup_multiple_pads(bl_pads, ARRAY_SIZE(bl_pads)); + gpio_direction_output(DISP0_PWR_EN, 1); +} + static void enable_rgb(struct display_info_t const *dev) { imx_iomux_v3_setup_multiple_pads(rgb_pads, ARRAY_SIZE(rgb_pads)); - gpio_direction_output(DISP0_PWR_EN, 1); + enable_backlight(); +} + +static void enable_lvds(struct display_info_t const *dev) +{ + enable_backlight(); } static struct i2c_pads_info i2c_pad_info1 = { @@ -370,7 +384,7 @@ struct display_info_t const displays[] = {{ .addr = 0, .pixfmt = IPU_PIX_FMT_RGB666, .detect = NULL, - .enable = NULL, + .enable = enable_lvds, .mode = { .name = "Hannstar-XGA", .refresh = 60, -- 2.25.1