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-rw-r--r--src/mainboard/google/snow/ramstage.c20
1 files changed, 13 insertions, 7 deletions
diff --git a/src/mainboard/google/snow/ramstage.c b/src/mainboard/google/snow/ramstage.c
index ad0266b621..962c79b653 100644
--- a/src/mainboard/google/snow/ramstage.c
+++ b/src/mainboard/google/snow/ramstage.c
@@ -139,6 +139,16 @@ static void exynos_dp_reset(void)
udelay(300 * 1000);
}
+/*
+ * This delay is T3 in the LCD timing spec (defined as >200ms). We set
+ * this down to 60ms since that's the approximate maximum amount of time
+ * it'll take a bridge to start outputting LVDS data. The delay of
+ * >200ms is just a conservative value to avoid turning on the backlight
+ * when there's random LCD data on the screen. Shaving 140ms off the
+ * boot is an acceptable trade-off.
+ */
+#define LCD_T3_DELAY_MS 60
+
#define LCD_T5_DELAY_MS 10
#define LCD_T6_DELAY_MS 10
@@ -199,7 +209,6 @@ static struct video_info snow_dp_video_info = {
static void mainboard_init(device_t dev)
{
int dp_tries;
- unsigned int wait_ms;
struct s5p_dp_device dp_device = {
.base = (struct exynos5_dp *)EXYNOS5250_DP1_BASE,
.video_info = &snow_dp_video_info,
@@ -215,20 +224,17 @@ static void mainboard_init(device_t dev)
exynos_dp_bridge_setup();
for (dp_tries = 1; dp_tries <= SNOW_MAX_DP_TRIES; dp_tries++) {
- if (wait_ms) {
- udelay(wait_ms);
- wait_ms = 0;
- }
-
exynos_dp_bridge_init();
if (exynos_dp_hotplug()) {
exynos_dp_reset();
continue;
}
- if (dp_controller_init(&dp_device, &wait_ms))
+ if (dp_controller_init(&dp_device))
continue;
+ udelay(LCD_T3_DELAY_MS * 1000);
+
snow_backlight_vdd();
snow_backlight_pwm();
snow_backlight_en();