From: Gabe Black <gabebl...@chromium.org>
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 <gabebl...@chromium.org>
Signed-off-by: Simon Glass <s...@chromium.org>
---
drivers/input/i8042.c | 13 ++++++++++++-
1 files changed, 12 insertions(+), 1 deletions(-)
diff --git a/drivers/input/i8042.c b/drivers/input/i8042.c
index 99254e4..cae2d0a 100644
--- a/drivers/input/i8042.c
+++ b/drivers/input/i8042.c
@@ -320,6 +320,17 @@ 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 __board_i8042_skip(void)
+{
+ /* As default, don't skip */
+ return 0;
+}
+int board_i8042_skip(void) __attribute__((weak, alias("__board_i8042_skip")));
+
/*******************************************************************************
*
* 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
--
1.7.7.3
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