diff options
Diffstat (limited to 'src/mainboard/google/trogdor/mainboard.c')
| -rw-r--r-- | src/mainboard/google/trogdor/mainboard.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/src/mainboard/google/trogdor/mainboard.c b/src/mainboard/google/trogdor/mainboard.c index 1a6013198b..5499a07121 100644 --- a/src/mainboard/google/trogdor/mainboard.c +++ b/src/mainboard/google/trogdor/mainboard.c @@ -106,12 +106,18 @@ static void power_on_ps8640_bridge(void) gpio_output(GPIO_EN_PP3300_DX_EDP, 1); gpio_output(GPIO_PS8640_EDP_BRIDGE_3V3_ENABLE, 1); + + /* + * According to ps8640 v1.4 spec, and the raise time of vdd33 is a bit + * long, so wait for 4ms after VDD33 goes high and then deassert PD. + */ + mdelay(4); + gpio_output(GPIO_PS8640_EDP_BRIDGE_PD_L, 1); - gpio_output(GPIO_PS8640_EDP_BRIDGE_RST_L, 0); /* - * According to ps8640 app note v0.6, wait for 2ms ("t1") after - * VDD33 goes high and then deassert RST. + * According to ps8640 app note v0.6, wait for 2ms after VDD33 goes + * high and then deassert RST. */ mdelay(2); |