diff options
| author | Gerard Salvatella <gerard.salvatella@toradex.com> | 2018-11-19 15:54:10 +0100 |
|---|---|---|
| committer | Tom Warren <twarren@nvidia.com> | 2019-02-20 09:01:45 -0700 |
| commit | a3c9021771608f5b514c75874fa0d8fbee2873d6 (patch) | |
| tree | de9dd8d381fdcecc7c8be000b7edc8782febcad1 /board/toradex/colibri_t20 | |
| parent | 146680003a776d9217d6d351ca4186f416a77226 (diff) | |
board: toradex: turn off lcd backlight before OS handover
U-Boot typically tears down the display controller before handing
control over to Linux. On LCD displays disabling pixel clock leads to a
fading out effect with vertical/horizontal lines. Make sure to disable
back light before booting Linux.
Signed-off-by: Gerard Salvatella <gerard.salvatella@toradex.com>
Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
Diffstat (limited to 'board/toradex/colibri_t20')
| -rw-r--r-- | board/toradex/colibri_t20/colibri_t20.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/board/toradex/colibri_t20/colibri_t20.c b/board/toradex/colibri_t20/colibri_t20.c index 5dd0f288ed..e0b27e92f8 100644 --- a/board/toradex/colibri_t20/colibri_t20.c +++ b/board/toradex/colibri_t20/colibri_t20.c @@ -150,4 +150,13 @@ void pin_mux_display(void) pinmux_set_func(PMUX_PINGRP_SDC, PMUX_FUNC_PWM); pinmux_tristate_disable(PMUX_PINGRP_SDC); } + +/* + * Backlight off before OS handover + */ +void board_preboot_os(void) +{ + gpio_request(TEGRA_GPIO(T, 4), "BL_ON"); + gpio_direction_output(TEGRA_GPIO(T, 4), 0); +} #endif |