The backlight uses FETs on the TPS65090. Enable this so that the display
is visible.
Signed-off-by: Simon Glass <s...@chromium.org>
Reviewed-by: Lukasz Majewski <l.majew...@samsung.com>
---
Changes in v2:
- Only set up the EDP bridge for snow
- Add a device tree compatibility string for the EDP bridge
- Check for EDP failure and print an error in that case
- Return immediately in exynos_backlight_on() if needed
board/samsung/smdk5250/exynos5-dt.c | 103 ++++++++++++++++++++++++++++++++++++
include/fdtdec.h | 1 +
lib/fdtdec.c | 1 +
3 files changed, 105 insertions(+)
diff --git a/board/samsung/smdk5250/exynos5-dt.c
b/board/samsung/smdk5250/exynos5-dt.c
index 2c1cf8a..73c9a35 100644
--- a/board/samsung/smdk5250/exynos5-dt.c
+++ b/board/samsung/smdk5250/exynos5-dt.c
@@ -183,6 +183,61 @@ int exynos_power_init(void)
#endif /* CONFIG_POWER */
#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, 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 */
+ 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 =
@@ -204,4 +259,52 @@ 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)
+ return;
+
+#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)
+{
+ 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
diff --git a/include/fdtdec.h b/include/fdtdec.h
index 669ab90..ea50d75 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -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,
};
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index e15e0ad..13e3f45 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -66,6 +66,7 @@ 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)
--
1.9.1.423.g4596e3a
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