From 48edb304d05d5d8b410db74f6e497adcfb132430 Mon Sep 17 00:00:00 2001 From: Gabe Black Date: Fri, 12 Oct 2012 14:02:02 +0000 Subject: [PATCH] input: Provide a board specific mechanism to decide whether to skip i8042 init This change adds a board overridable function which can be used to decide whether or not to initialize the i8042 keyboard controller. On systems where it isn't actually connected to anything, this can save a significant amount of boot time. On Stumpy, this saves about 200ms on boot. Signed-off-by: Gabe Black Signed-off-by: Simon Glass Signed-off-by: Tom Rini --- drivers/input/i8042.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/input/i8042.c b/drivers/input/i8042.c index 6839c6bac5..3a4c467c59 100644 --- a/drivers/input/i8042.c +++ b/drivers/input/i8042.c @@ -26,6 +26,7 @@ /* includes */ #include +#include #ifdef CONFIG_USE_CPCIDVI extern u8 gt_cpcidvi_in8(u32 offset); @@ -320,6 +321,16 @@ static int kbd_controller_present(void) return in8(I8042_STATUS_REG) != 0xff; } +/* + * Implement a weak default function for boards that optionally + * need to skip the i8042 initialization. + */ +int __weak board_i8042_skip(void) +{ + /* As default, don't skip */ + return 0; +} + /******************************************************************************* * * i8042_kbd_init - reset keyboard and init state flags @@ -329,7 +340,7 @@ int i8042_kbd_init(void) int keymap, try; char *penv; - if (!kbd_controller_present()) + if (!kbd_controller_present() || board_i8042_skip()) return -1; #ifdef CONFIG_USE_CPCIDVI -- 2.25.1