input: Fix i8042 keyboard reset

The i8042 keyboard reset was not checking the results of the output
buffer after the reset command. This can jam up some KBC/keyboards.
Also, remove a write to the wrong register and the CONFIG setting
around the incorrect write.

Signed-off-by: Marc Jones <marc.jones@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Rini <trini@ti.com>

diff --git a/drivers/input/i8042.c b/drivers/input/i8042.c
index 691aabf..26958aa 100644 (file)
--- a/drivers/input/i8042.c
+++ b/drivers/input/i8042.c
@@ -666,31 +666,53 @@ static int kbd_input_empty(void)
 
 /******************************************************************************/
 
+static int wait_until_kbd_output_full(void)
+{
+       int kbdTimeout = KBD_TIMEOUT * 1000;
+
+       while (((in8(I8042_STATUS_REG) & 0x01) == 0) && kbdTimeout--)
+               udelay(1);
+
+       return kbdTimeout != -1;
+}
+
+/******************************************************************************/
+
 static int kbd_reset(void)
 {
+       /* KB Reset */
        if (kbd_input_empty() == 0)
                return -1;
 
        out8(I8042_DATA_REG, 0xff);
 
+       if (wait_until_kbd_output_full() == 0)
+               return -1;
+
+       if (in8(I8042_DATA_REG) != 0xfa) /* ACK */
+               return -1;
+
+       if (wait_until_kbd_output_full() == 0)
+               return -1;
+
+       if (in8(I8042_DATA_REG) != 0xaa) /* Test Pass*/
+               return -1;
+
        if (kbd_input_empty() == 0)
                return -1;
 
-#ifdef CONFIG_USE_CPCIDVI
+       /* Set KBC mode */
        out8(I8042_COMMAND_REG, 0x60);
-#else
-       out8(I8042_DATA_REG, 0x60);
-#endif
 
        if (kbd_input_empty() == 0)
                return -1;
 
        out8(I8042_DATA_REG, 0x45);
 
-
        if (kbd_input_empty() == 0)
                return -1;
 
+       /* Enable Keyboard */
        out8(I8042_COMMAND_REG, 0xae);
 
        if (kbd_input_empty() == 0)