From 27b295b98b65e05635ee5a40967adb0f9ca79afa Mon Sep 17 00:00:00 2001 From: Felix Held Date: Thu, 25 Mar 2021 01:20:41 +0100 Subject: soc/amd: add DISABLE_KEYBOARD_RESET_PIN option The KBRST_L pin will cause a reset when driven or pulled low even when the GPIO mux is set to GPIO and not native function. So when you want to use that pin as general purpose output the keyboard reset input functionality needs to be disabled by selecting this option in the board's Kconfig file to avoid causing a reset by writing a 0 to the output level bit when it's configured as an output. Signed-off-by: Felix Held Suggested-by: Furquan Shaikh Change-Id: I517ad551db9321f26afdba15d97ddb61be1f7d51 Reviewed-on: https://review.coreboot.org/c/coreboot/+/51757 Reviewed-by: Furquan Shaikh Reviewed-by: Kangheui Won Tested-by: build bot (Jenkins) --- src/soc/amd/picasso/Kconfig | 8 ++++++++ src/soc/amd/picasso/early_fch.c | 4 ++++ 2 files changed, 12 insertions(+) (limited to 'src/soc/amd/picasso') diff --git a/src/soc/amd/picasso/Kconfig b/src/soc/amd/picasso/Kconfig index 1fca390fea..b6ab78494a 100644 --- a/src/soc/amd/picasso/Kconfig +++ b/src/soc/amd/picasso/Kconfig @@ -320,6 +320,14 @@ config DISABLE_SPI_FLASH_ROM_SHARING removes arbitration with board and assumes the chipset controls the SPI flash bus entirely. +config DISABLE_KEYBOARD_RESET_PIN + bool + help + Instruct the SoC to not use the state of GPIO_129 as keyboard reset + signal. When this pin is used as GPIO and the keyboard reset + functionality isn't disabled, configuring it as an output and driving + it as 0 will cause a reset. + config MAINBOARD_POWER_RESTORE def_bool n help diff --git a/src/soc/amd/picasso/early_fch.c b/src/soc/amd/picasso/early_fch.c index 1aff83b5c8..63e192fa7f 100644 --- a/src/soc/amd/picasso/early_fch.c +++ b/src/soc/amd/picasso/early_fch.c @@ -62,6 +62,10 @@ void fch_pre_init(void) if (CONFIG(AMD_SOC_CONSOLE_UART)) set_uart_config(CONFIG_UART_FOR_CONSOLE); + + /* disable the keyboard reset function before mainboard GPIO setup */ + if (CONFIG(DISABLE_KEYBOARD_RESET_PIN)) + fch_disable_kb_rst(); } /* After console init */ -- cgit v1.2.3