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i8042: Handle a duplicate power-on-reset response

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Sometimes we seem to get 0xaa twice which causes the config read to fail.
This causes chromebook_link to fail to set up the keyboard.

Add a check for this and read the config again when detected.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2015-11-11 10:05:46 -07:00
parent dcbf825714
commit 011d89d606
1 changed files with 19 additions and 2 deletions
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21
drivers/input/i8042.c
View file

@ -15,13 +15,20 @@
#include <keyboard.h>
#include <asm/io.h>
DECLARE_GLOBAL_DATA_PTR;
/* defines */
#define in8(p) inb(p)
#define out8(p, v) outb(v, p)
enum {
QUIRK_DUP_POR = 1 << 0,
};
/* locals */
struct i8042_kbd_priv {
bool extended; /* true if an extended keycode is expected next */
int quirks; /* quirks that we support */
};
static unsigned char ext_key_map[] = {
@ -113,7 +120,7 @@ static int kbd_cmd_write(int cmd, int data)
return kbd_write(I8042_DATA_REG, data);
}
static int kbd_reset(void)
static int kbd_reset(int quirk)
{
int config;
@ -132,6 +139,10 @@ static int kbd_reset(void)
if (config == -1)
goto err;
/* Sometimes get a second byte */
else if ((quirk & QUIRK_DUP_POR) && config == KBD_POR)
config = kbd_cmd_read(CMD_RD_CONFIG);
config |= CONFIG_AT_TRANS;
config &= ~(CONFIG_KIRQ_EN | CONFIG_MIRQ_EN);
if (kbd_cmd_write(CMD_WR_CONFIG, config))
@ -246,6 +257,7 @@ static int i8042_kbd_check(struct input_config *input)
static int i8042_start(struct udevice *dev)
{
struct keyboard_priv *uc_priv = dev_get_uclass_priv(dev);
struct i8042_kbd_priv *priv = dev_get_priv(dev);
struct input_config *input = &uc_priv->input;
int keymap, try;
char *penv;
@ -264,7 +276,7 @@ static int i8042_start(struct udevice *dev)
keymap = KBD_GER;
}
for (try = 0; kbd_reset() != 0; try++) {
for (try = 0; kbd_reset(priv->quirks) != 0; try++) {
if (try >= KBD_RESET_TRIES)
return -1;
}
@ -294,10 +306,15 @@ static int i8042_start(struct udevice *dev)
static int i8042_kbd_probe(struct udevice *dev)
{
struct keyboard_priv *uc_priv = dev_get_uclass_priv(dev);
struct i8042_kbd_priv *priv = dev_get_priv(dev);
struct stdio_dev *sdev = &uc_priv->sdev;
struct input_config *input = &uc_priv->input;
int ret;
if (fdtdec_get_bool(gd->fdt_blob, dev->of_offset,
"intel,duplicate-por"))
priv->quirks |= QUIRK_DUP_POR;
/* Register the device. i8042_start() will be called soon */
input->dev = dev;
input->read_keys = i8042_kbd_check;