diff options
Diffstat (limited to 'src/mainboard/google/veyron_jerry')
| -rw-r--r-- | src/mainboard/google/veyron_jerry/bootblock.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/src/mainboard/google/veyron_jerry/bootblock.c b/src/mainboard/google/veyron_jerry/bootblock.c index b34199dfe5..30b00e1145 100644 --- a/src/mainboard/google/veyron_jerry/bootblock.c +++ b/src/mainboard/google/veyron_jerry/bootblock.c @@ -20,6 +20,7 @@ #include <arch/io.h> #include <bootblock_common.h> +#include <delay.h> #include <soc/clock.h> #include <soc/i2c.h> #include <soc/grf.h> @@ -32,11 +33,16 @@ void bootblock_mainboard_init(void) { - /* cpu frequency will up to 1.8GHz, so the buck1 must up to 1.3v */ + /* Up VDD_CPU (BUCK1) to 1.4V to support max CPU frequency (1.8GHz). */ 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 */ |