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mx6sabresd: Allow LVDS backlight to be functional after a kernel reboot 

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 <marco.franchi@nxp.com>
Acked-by: Stefano Babic <sbabic@denx.de>
Tested-by: Fabio Estevam <fabio.estevam@nxp.com>
This commit is contained in:
Marco Franchi 2016-06-08 15:05:31 -03:00 committed by Stefano Babic
parent dc557e9a1f
commit 6c51a3644e
1 changed files with 16 additions and 2 deletions
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18
board/freescale/mx6sabresd/mx6sabresd.c
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@ -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,