Remove PS/2 keyboard initialization on resume from S3

When we go through the resume path, there shouldn't ever be a need to
initialize the PS/2 keyboard.  The OS is going to reinitialize it
anyway, and it just slows the resume.

Verified Code flow in normal boot/S3 resume with print statements.
Verified Keyboard was correctly disabled and flushed by booting
to recovery mode screen while pressing keys on the integrated
keyboard.

Change-Id: I48bdca2fa2cc0c965401d10fef75cadb09d2e1e9
Signed-off-by: Martin Roth <martin.roth@se-eng.com>
Reviewed-on: https://gerrit.chromium.org/gerrit/63648
Reviewed-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: Shawn Nematbakhsh <shawnn@chromium.org>
Commit-Queue: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-on: http://review.coreboot.org/4396
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

src/drivers/pc80/keyboard.c

@@ -25,6 +25,9 @@
 #include <device/device.h>
 #include <arch/io.h>
 #include <delay.h>
+#if CONFIG_HAVE_ACPI_RESUME
+#include <arch/acpi.h>
+#endif
 
 #define KBD_DATA	0x60
 #define KBD_COMMAND	0x64
@@ -194,6 +197,12 @@ void pc_keyboard_init(struct pc_keyboard *keyboard)
 	u8 regval;
 	if (!CONFIG_DRIVERS_PS2_KEYBOARD)
 		return;
+
+#if CONFIG_HAVE_ACPI_RESUME
+	if (acpi_slp_type == 3)
+		return;
+#endif
+
 	printk(BIOS_DEBUG, "Keyboard init...\n");
 
 	/* Run a keyboard controller self-test */