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Subject[19/75] Input: synaptics - fix touchpad not working after S2R on Vostro V13
3.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dmitry Torokhov <dmitry.torokhov@gmail.com>

commit 8521478f67e95ada4e87970c7b41e504c724b2cf upstream.

Synaptics touchpads on several Dell laptops, particularly Vostro V13
systems, may not respond properly to PS/2 commands and queries immediately
after resuming from suspend to RAM. This leads to unresponsive touchpad
after suspend/resume cycle.

Adding a 1-second delay after resetting the device allows touchpad to
finish initializing (calibrating?) and start reacting properly.

Reported-by: Daniel Manrique <daniel.manrique@canonical.com>
Tested-by: Daniel Manrique <daniel.manrique@canonical.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/input/mouse/synaptics.c | 11 +++++++++++
1 file changed, 11 insertions(+)

--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -24,6 +24,7 @@
*/

#include <linux/module.h>
+#include <linux/delay.h>
#include <linux/dmi.h>
#include <linux/input/mt.h>
#include <linux/serio.h>
@@ -786,6 +787,16 @@ static int synaptics_reconnect(struct ps

do {
psmouse_reset(psmouse);
+ if (retry) {
+ /*
+ * On some boxes, right after resuming, the touchpad
+ * needs some time to finish initializing (I assume
+ * it needs time to calibrate) and start responding
+ * to Synaptics-specific queries, so let's wait a
+ * bit.
+ */
+ ssleep(1);
+ }
error = synaptics_detect(psmouse, 0);
} while (error && ++retry < 3);




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