diff options
Diffstat (limited to 'src/mainboard')
| -rw-r--r-- | src/mainboard/google/snow/ramstage.c | 20 |
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(); |