The backlight uses FETs on the TPS65090. Enable this so that the display is visible.
Signed-off-by: Simon Glass sjg@chromium.org ---
board/samsung/smdk5250/exynos5-dt.c | 90 +++++++++++++++++++++++++++++++++++++ 1 file changed, 90 insertions(+)
diff --git a/board/samsung/smdk5250/exynos5-dt.c b/board/samsung/smdk5250/exynos5-dt.c index c83b034..a0ae641 100644 --- a/board/samsung/smdk5250/exynos5-dt.c +++ b/board/samsung/smdk5250/exynos5-dt.c @@ -20,6 +20,7 @@ #include <asm/arch/sromc.h> #include <power/pmic.h> #include <power/max77686_pmic.h> +#include <power/tps65090_pmic.h> #include <tmu.h>
DECLARE_GLOBAL_DATA_PTR; @@ -60,6 +61,52 @@ int checkboard(void) #endif
#ifdef CONFIG_LCD +static int board_dp_bridge_setup(void) +{ + struct exynos5_gpio_part1 *gpio1 = + (struct exynos5_gpio_part1 *)samsung_get_base_gpio_part1(); + const int MAX_TRIES = 10; + int num_tries; + + debug("%s\n", __func__); + + /* Setup the GPIOs */ + + /* PD is ACTIVE_LOW, and initially de-asserted */ + s5p_gpio_set_pull(&gpio1->y2, 5, GPIO_PULL_NONE); + s5p_gpio_direction_output(&gpio1->y2, 5, 1); + + /* Reset is ACTIVE_LOW */ + s5p_gpio_set_pull(&gpio1->x1, 5, GPIO_PULL_NONE); + s5p_gpio_direction_output(&gpio1->x1, 5, 0); + + udelay(10); + s5p_gpio_set_value(&gpio1->x1, 5, 1); + + s5p_gpio_direction_input(&gpio1->x0, 7); + + /* + * We need to wait for 90ms after bringing up the bridge since there + * is a phantom "high" on the HPD chip during its bootup. The phantom + * high comes within 7ms of de-asserting PD and persists for at least + * 15ms. The real high comes roughly 50ms after PD is de-asserted. The + * phantom high makes it hard for us to know when the NXP chip is up. + */ + mdelay(90); + + for (num_tries = 0; num_tries < MAX_TRIES; num_tries++) { + /* Check HPD. If it's high, we're all good. */ + if (s5p_gpio_get_value(&gpio1->x0, 7)) + return 0; + + debug("%s: eDP bridge failed to come up; try %d of %d\n", + __func__, num_tries, MAX_TRIES); + } + + /* Immediately go into bridge reset if the hp line is not high */ + return -ENODEV; +} + void exynos_cfg_lcd_gpio(void) { struct exynos5_gpio_part1 *gpio1 = @@ -81,4 +128,47 @@ void exynos_set_dp_phy(unsigned int onoff) { set_dp_phy_ctrl(onoff); } + +void exynos_backlight_on(unsigned int onoff) +{ + debug("%s(%u)\n", __func__, onoff); + + if (onoff) { +#ifdef CONFIG_POWER_TPS65090 + struct exynos5_gpio_part1 *gpio1 = + (struct exynos5_gpio_part1 *) + samsung_get_base_gpio_part1(); + int ret; + + ret = tps65090_fet_enable(1); /* Enable FET1, backlight */ + if (ret) + return; + + /* T5 in the LCD timing spec (defined as > 10ms) */ + mdelay(10); + + /* board_dp_backlight_pwm */ + s5p_gpio_direction_output(&gpio1->b2, 0, 1); + + /* T6 in the LCD timing spec (defined as > 10ms) */ + mdelay(10); + + /* board_dp_backlight_en */ + s5p_gpio_direction_output(&gpio1->x3, 0, 1); +#endif + } +} + +void exynos_lcd_power_on(void) +{ + debug("%s\n", __func__); + +#ifdef CONFIG_POWER_TPS65090 + /* board_dp_lcd_vdd */ + tps65090_fet_enable(6); /* Enable FET6, lcd panel */ +#endif + + board_dp_bridge_setup(); +} + #endif