[PATCH] Fix two finger scroll which stops working on synaptics touchpad after resume

[PATCH] Fix two finger scroll which stops working on synaptics touchpad after resume

[justin busby]

Hello,

Bug reported here: https://bugzilla.kernel.org/show_bug.cgi?id=196719 

Reliably reproduceable on my Lenovo T540p.

It looks like the this was introduced between the fast reconnect and smbus companion work in 0ab3fa57425023f42e8822a293d9b87a3ad4e2b3 ( Input: psmouse - implement fast reconnect option) and 8eb92e5c91338eb19f86ffb2232258337ebf905b (Input: psmouse - add support for SMBus companions) respectively meaning that fast_reconnect is called psmouse-smbus.c rather reconnect in synaptics.c. This is because synaptics.c doesn't set up fast_reconnect in the struct so it's left as the one added by the smbus companion code.

Set the fast_reconnect function pointer to the reconnect function in synaptics.c.

Kind Regards,
Justin.

--- /home/justin/development/linux/drivers/input/mouse/synaptics.c.orig	2020-12-22 17:35:47.194989017 +0000
+++ /home/justin/development/linux/drivers/input/mouse/synaptics.c	2020-12-22 17:36:09.863354144 +0000
@@ -1619,6 +1619,7 @@ static int synaptics_init_ps2(struct psm
 	psmouse->set_rate = synaptics_set_rate;
 	psmouse->disconnect = synaptics_disconnect;
 	psmouse->reconnect = synaptics_reconnect;
+	psmouse->fast_reconnect = synaptics_reconnect;
 	psmouse->cleanup = synaptics_reset;
 	/* Synaptics can usually stay in sync without extra help */
 	psmouse->resync_time = 0;

Signed-off-by: Justin Busby <jb.kernel@fastmail.com>