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exynos: Enable the LCD backlight for snow

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The backlight uses FETs on the TPS65090. Enable this so that the display
is visible.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
This commit is contained in:
Simon Glass 2014-05-20 06:01:42 -06:00 committed by Minkyu Kang
parent 14ccc30b34
commit a9cf6da925
3 changed files with 101 additions and 1 deletions
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100
board/samsung/smdk5250/exynos5-dt.c
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@ -11,9 +11,9 @@
#include <i2c.h>
#include <netdev.h>
#include <spi.h>
#include <asm/gpio.h>
#include <asm/arch/cpu.h>
#include <asm/arch/dwmmc.h>
#include <asm/arch/gpio.h>
#include <asm/arch/mmc.h>
#include <asm/arch/pinmux.h>
#include <asm/arch/power.h>
@ -180,6 +180,59 @@ int exynos_power_init(void)
#endif /* CONFIG_POWER */
#ifdef CONFIG_LCD
static int board_dp_bridge_setup(void)
{
const int max_tries = 10;
int num_tries, node;
/*
* TODO(sjg): Use device tree for GPIOs when exynos GPIO
* numbering patch is in mainline.
*/
debug("%s\n", __func__);
node = fdtdec_next_compatible(gd->fdt_blob, 0, COMPAT_NXP_PTN3460);
if (node < 0) {
debug("%s: No node for DP bridge in device tree\n", __func__);
return -ENODEV;
}
/* Setup the GPIOs */
/* PD is ACTIVE_LOW, and initially de-asserted */
gpio_set_pull(EXYNOS5_GPIO_Y25, S5P_GPIO_PULL_NONE);
gpio_direction_output(EXYNOS5_GPIO_Y25, 1);
/* Reset is ACTIVE_LOW */
gpio_set_pull(EXYNOS5_GPIO_X15, S5P_GPIO_PULL_NONE);
gpio_direction_output(EXYNOS5_GPIO_X15, 0);
udelay(10);
gpio_set_value(EXYNOS5_GPIO_X15, 1);
gpio_direction_input(EXYNOS5_GPIO_X07);
/*
* 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 (gpio_get_value(EXYNOS5_GPIO_X07))
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)
{
/* For Backlight */
@ -198,4 +251,49 @@ void exynos_set_dp_phy(unsigned int onoff)
{
set_dp_phy_ctrl(onoff);
}
void exynos_backlight_on(unsigned int on)
{
debug("%s(%u)\n", __func__, on);
if (!on)
return;
#ifdef CONFIG_POWER_TPS65090
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 */
gpio_direction_output(EXYNOS5_GPIO_B20, 1);
/* T6 in the LCD timing spec (defined as > 10ms) */
mdelay(10);
/* board_dp_backlight_en */
gpio_direction_output(EXYNOS5_GPIO_X30, 1);
#endif
}
void exynos_lcd_power_on(void)
{
int ret;
debug("%s\n", __func__);
#ifdef CONFIG_POWER_TPS65090
/* board_dp_lcd_vdd */
tps65090_fet_enable(6); /* Enable FET6, lcd panel */
#endif
ret = board_dp_bridge_setup();
if (ret && ret != -ENODEV)
printf("LCD bridge failed to enable: %d\n", ret);
}
#endif

1
include/fdtdec.h
View File

@ -93,6 +93,7 @@ enum fdt_compat_id {
COMPAT_SANDBOX_HOST_EMULATION, /* Sandbox emulation of a function */
COMPAT_SANDBOX_LCD_SDL, /* Sandbox LCD emulation with SDL */
COMPAT_TI_TPS65090, /* Texas Instrument TPS65090 */
COMPAT_NXP_PTN3460, /* NXP PTN3460 DP/LVDS bridge */
COMPAT_COUNT,
};

1
lib/fdtdec.c
View File

@ -67,6 +67,7 @@ static const char * const compat_names[COMPAT_COUNT] = {
COMPAT(SANDBOX_HOST_EMULATION, "sandbox,host-emulation"),
COMPAT(SANDBOX_LCD_SDL, "sandbox,lcd-sdl"),
COMPAT(TI_TPS65090, "ti,tps65090"),
COMPAT(COMPAT_NXP_PTN3460, "nxp,ptn3460"),
};
const char *fdtdec_get_compatible(enum fdt_compat_id id)