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-rw-r--r--src/mainboard/google/gru/bootblock.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/src/mainboard/google/gru/bootblock.c b/src/mainboard/google/gru/bootblock.c
index d08b4cba69..74e02b273f 100644
--- a/src/mainboard/google/gru/bootblock.c
+++ b/src/mainboard/google/gru/bootblock.c
@@ -22,6 +22,19 @@
void bootblock_mainboard_early_init(void)
{
+ /* Let gpio2ab io domains works at 1.8V.
+ *
+ * If io_vsel[0] == 0(default value), gpio2ab io domains is 3.0V
+ * powerd by APIO2_VDD, otherwise, 1.8V supplied by APIO2_VDDPST.
+ * But from the schematic of kevin rev0, the APIO2_VDD and
+ * APIO2_VDDPST both are 1.8V(intentionally?).
+ *
+ * So, by default, CPU1_SDIO_PWREN(GPIO2_A2) can't output 3.0V
+ * because the supply is 1.8V.
+ * Let ask GPIO2_A2 output 1.8V to make GPIO interal logic happy.
+ */
+ write32(&rk3399_grf->io_vsel, RK_SETBITS(1 << 0));
+
if (IS_ENABLED(CONFIG_DRIVERS_UART)) {
_Static_assert(CONFIG_CONSOLE_SERIAL_UART_ADDRESS == UART2_BASE,
"CONSOLE_SERIAL_UART should be UART2");