diff options
| -rw-r--r-- | src/mainboard/google/gru/bootblock.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/mainboard/google/gru/bootblock.c b/src/mainboard/google/gru/bootblock.c index a3d31212c2..162a7e51f1 100644 --- a/src/mainboard/google/gru/bootblock.c +++ b/src/mainboard/google/gru/bootblock.c @@ -48,6 +48,12 @@ void bootblock_mainboard_early_init(void) if (IS_ENABLED(CONFIG_BOARD_GOOGLE_SCARLET)) write32(&rk3399_grf->io_vsel, RK_SETBITS(1 << 3)); + /* Reconfigure GPIO1 from dynamic voltage selection through GPIO0_B1 to + hardcoded 1.8V, and change that pin to a normal GPIO. The TRM says + this is already the power-on reset, but we all know that TRMs lie. */ + write32(&rk3399_pmugrf->soc_con0, RK_SETBITS(1 << 9 | 1 << 8)); + write32(&rk3399_pmugrf->gpio0b_iomux, RK_CLRBITS(3 << 2)); + /* Enable rails powering GPIO blocks, among other things. */ gpio_output(GPIO_P30V_EN, 1); if (!IS_ENABLED(CONFIG_BOARD_GOOGLE_SCARLET)) |