diff options
Diffstat (limited to 'src/mainboard/google')
| -rw-r--r-- | src/mainboard/google/veyron_pinky/bootblock.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/src/mainboard/google/veyron_pinky/bootblock.c b/src/mainboard/google/veyron_pinky/bootblock.c index b34199dfe5..99719c4024 100644 --- a/src/mainboard/google/veyron_pinky/bootblock.c +++ b/src/mainboard/google/veyron_pinky/bootblock.c @@ -27,16 +27,25 @@ #include <soc/rk808.h> #include <soc/spi.h> #include <vendorcode/google/chromeos/chromeos.h> +#include <delay.h> #include "board.h" void bootblock_mainboard_init(void) { - /* cpu frequency will up to 1.8GHz, so the buck1 must up to 1.3v */ + /* cpu frequency will up to 1.8GHz, + * in our experience the buck1 + * must up to 1.4v + */ setbits_le32(&rk3288_pmu->iomux_i2c0scl, IOMUX_I2C0SCL); setbits_le32(&rk3288_pmu->iomux_i2c0sda, IOMUX_I2C0SDA); i2c_init(PMIC_BUS, 400*KHz); - rk808_configure_buck(PMIC_BUS, 1, 1300); + + /* Slowly raise to max CPU voltage to prevent overshoot */ + rk808_configure_buck(PMIC_BUS, 1, 1200); + udelay(175);/* Must wait for voltage to stabilize,2mV/us */ + rk808_configure_buck(PMIC_BUS, 1, 1400); + udelay(100);/* Must wait for voltage to stabilize,2mV/us */ rkclk_configure_cpu(); /* i2c1 for tpm */ |