Input: i8042 - retry failed CTR writes when resuming

There are systems that fail in i8042_resume() with

	i8042: Can't write CTR to resume

as i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR) fails even though the
controller claimed itself to be ready before.

One retry after failing write fixes the problems on the failing systems.

Reported-by: Helmut Schaa <hschaa@novell.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
index 592ff55..170f71e 100644 (file)
--- a/drivers/input/serio/i8042.c
+++ b/drivers/input/serio/i8042.c
@@ -952,8 +952,12 @@ static int i8042_resume(struct platform_device *dev)
        i8042_ctr |= I8042_CTR_AUXDIS | I8042_CTR_KBDDIS;
        i8042_ctr &= ~(I8042_CTR_AUXINT | I8042_CTR_KBDINT);
        if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
-               printk(KERN_ERR "i8042: Can't write CTR to resume\n");
-               return -EIO;
+               printk(KERN_WARNING "i8042: Can't write CTR to resume, retrying...\n");
+               msleep(50);
+               if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
+                       printk(KERN_ERR "i8042: CTR write retry failed\n");
+                       return -EIO;
+               }
        }