From be929f41af9b60c9268bc414fa919eb12f7ba552 Mon Sep 17 00:00:00 2001 From: Lin Huang Date: Mon, 28 Mar 2016 20:17:32 +0800 Subject: google/gru: select 1.8V as gpio2ab io domain On kevin board, both the gpio2ab's io domain APIO2_VDDPST and APIO2_VDD are 1.8V. So gpio2ab can only output 1.8V. BRANCH=none BUG=chrome-os-partner:52510 TEST=Apply this patch, CPU1_SDIO_PWREN(GPIO2_A2) can output 1.8V Change-Id: Iefe58cf5ad83a8e79916ad177d148c1036283668 Signed-off-by: Patrick Georgi Original-Commit-Id: 9c4afee265f3f31c1defee08cb89ab3e45ff8d1a Original-Change-Id: I0216c8efb7ef9256b878adeeee0a52335bf69f93 Original-Signed-off-by: Lin Huang Original-Signed-off-by: Shunqian Zheng Original-Reviewed-on: https://chromium-review.googlesource.com/337194 Original-Commit-Ready: Vadim Bendebury Original-Tested-by: Vadim Bendebury Original-Reviewed-by: Vadim Bendebury Reviewed-on: https://review.coreboot.org/14726 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer --- src/mainboard/google/gru/bootblock.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'src/mainboard') 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"); -- cgit v1.2.3