From: Gerard Salvatella gerard.salvatella@toradex.com
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 --- board/toradex/apalis-tk1/apalis-tk1.c | 9 +++++++++ board/toradex/apalis_imx6/apalis_imx6.c | 9 +++++++++ board/toradex/apalis_t30/apalis_t30.c | 9 +++++++++ board/toradex/colibri_imx6/colibri_imx6.c | 9 +++++++++ board/toradex/colibri_imx7/colibri_imx7.c | 9 +++++++++ board/toradex/colibri_t20/colibri_t20.c | 9 +++++++++ board/toradex/colibri_t30/colibri_t30.c | 9 +++++++++ board/toradex/colibri_vf/colibri_vf.c | 12 +++++++++++- 8 files changed, 74 insertions(+), 1 deletion(-)
diff --git a/board/toradex/apalis-tk1/apalis-tk1.c b/board/toradex/apalis-tk1/apalis-tk1.c index d6a736d8aa..b87e9e7a3e 100644 --- a/board/toradex/apalis-tk1/apalis-tk1.c +++ b/board/toradex/apalis-tk1/apalis-tk1.c @@ -240,3 +240,12 @@ void tegra_pcie_board_port_reset(struct tegra_pcie_port *port) } } #endif /* CONFIG_PCI_TEGRA */ + +/* + * Backlight off before OS handover + */ +void board_preboot_os(void) +{ + gpio_request(TEGRA_GPIO(BB, 5), "BL_ON"); + gpio_direction_output(TEGRA_GPIO(BB, 5), 0); +} diff --git a/board/toradex/apalis_imx6/apalis_imx6.c b/board/toradex/apalis_imx6/apalis_imx6.c index 368db9c488..d11207c7f4 100644 --- a/board/toradex/apalis_imx6/apalis_imx6.c +++ b/board/toradex/apalis_imx6/apalis_imx6.c @@ -745,6 +745,15 @@ static void setup_display(void) gpio_direction_output(RGB_BACKLIGHTPWM_OE, 0); gpio_direction_output(RGB_BACKLIGHT_GP, 1); } + +/* + * Backlight off before OS handover + */ +void board_preboot_os(void) +{ + gpio_direction_output(RGB_BACKLIGHTPWM_GP, 1); + gpio_direction_output(RGB_BACKLIGHT_GP, 0); +} #endif /* defined(CONFIG_VIDEO_IPUV3) */
int board_early_init_f(void) diff --git a/board/toradex/apalis_t30/apalis_t30.c b/board/toradex/apalis_t30/apalis_t30.c index ace9c5b168..df9bc8e707 100644 --- a/board/toradex/apalis_t30/apalis_t30.c +++ b/board/toradex/apalis_t30/apalis_t30.c @@ -164,3 +164,12 @@ void tegra_pcie_board_port_reset(struct tegra_pcie_port *port) #endif /* CONFIG_APALIS_T30_PCIE_EVALBOARD_INIT */ } #endif /* CONFIG_PCI_TEGRA */ + +/* + * Backlight off before OS handover + */ +void board_preboot_os(void) +{ + gpio_request(TEGRA_GPIO(V, 2), "BKL1_ON"); + gpio_direction_output(TEGRA_GPIO(V, 2), 0); +} diff --git a/board/toradex/colibri_imx6/colibri_imx6.c b/board/toradex/colibri_imx6/colibri_imx6.c index 68c0c02a8a..17876f27e9 100644 --- a/board/toradex/colibri_imx6/colibri_imx6.c +++ b/board/toradex/colibri_imx6/colibri_imx6.c @@ -622,6 +622,15 @@ static void setup_display(void) gpio_direction_output(RGB_BACKLIGHTPWM_GP, 0); gpio_direction_output(RGB_BACKLIGHT_GP, 1); } + +/* + * Backlight off before OS handover + */ +void board_preboot_os(void) +{ + gpio_direction_output(RGB_BACKLIGHTPWM_GP, 1); + gpio_direction_output(RGB_BACKLIGHT_GP, 0); +} #endif /* defined(CONFIG_VIDEO_IPUV3) */
int board_early_init_f(void) diff --git a/board/toradex/colibri_imx7/colibri_imx7.c b/board/toradex/colibri_imx7/colibri_imx7.c index a4c99626b4..be027afd10 100644 --- a/board/toradex/colibri_imx7/colibri_imx7.c +++ b/board/toradex/colibri_imx7/colibri_imx7.c @@ -182,6 +182,15 @@ static int setup_lcd(void) } #endif
+/* + * Backlight off before OS handover + */ +void board_preboot_os(void) +{ + gpio_direction_output(GPIO_PWM_A, 1); + gpio_direction_output(GPIO_BL_ON, 0); +} + #ifdef CONFIG_FEC_MXC static iomux_v3_cfg_t const fec1_pads[] = { #ifndef CONFIG_COLIBRI_IMX7_EXT_PHYCLK 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 diff --git a/board/toradex/colibri_t30/colibri_t30.c b/board/toradex/colibri_t30/colibri_t30.c index 8ea96188f6..b6b00e3860 100644 --- a/board/toradex/colibri_t30/colibri_t30.c +++ b/board/toradex/colibri_t30/colibri_t30.c @@ -66,3 +66,12 @@ void pin_mux_usb(void) udelay(5); gpio_set_value(TEGRA_GPIO(DD, 0), 1); } + +/* + * Backlight off before OS handover + */ +void board_preboot_os(void) +{ + gpio_request(TEGRA_GPIO(V, 2), "BL_ON"); + gpio_direction_output(TEGRA_GPIO(V, 2), 0); +} diff --git a/board/toradex/colibri_vf/colibri_vf.c b/board/toradex/colibri_vf/colibri_vf.c index 4db1757469..176c5201f9 100644 --- a/board/toradex/colibri_vf/colibri_vf.c +++ b/board/toradex/colibri_vf/colibri_vf.c @@ -38,8 +38,9 @@ DECLARE_GLOBAL_DATA_PTR; #define ENET_PAD_CTRL (PAD_CTL_PUS_47K_UP | PAD_CTL_SPEED_HIGH | \ PAD_CTL_DSE_50ohm | PAD_CTL_OBE_IBE_ENABLE)
-#define USB_PEN_GPIO 83 +#define USB_PEN_GPIO 83 #define USB_CDET_GPIO 102 +#define PTC0_GPIO_45 45
static struct ddrmc_cr_setting colibri_vf_cr_settings[] = { /* levelling */ @@ -640,3 +641,12 @@ int board_usb_phy_mode(int port) } } #endif + +/* + * Backlight off before OS handover + */ +void board_preboot_os(void) +{ + gpio_request(PTC0_GPIO_45, "BL_ON"); + gpio_direction_output(PTC0_GPIO_45, 0); +}