This is a note to let you know that I've just added the patch titled
Input: alps - allow up to 2 invalid packets without resetting device
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
input-alps-allow-up-to-2-invalid-packets-without-resetting-device.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 9d720b34c0a432639252f63012e18b0507f5b432 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali.rohar@xxxxxxxxx>
Date: Sat, 8 Nov 2014 12:58:57 -0800
Subject: Input: alps - allow up to 2 invalid packets without resetting device
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From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali.rohar@xxxxxxxxx>
commit 9d720b34c0a432639252f63012e18b0507f5b432 upstream.
On some Dell Latitude laptops ALPS device or Dell EC send one invalid byte
in 6 bytes ALPS packet. In this case psmouse driver enter out of sync
state. It looks like that all other bytes in packets are valid and also
device working properly. So there is no need to do full device reset, just
need to wait for byte which match condition for first byte (start of
packet). Because ALPS packets are bigger (6 or 8 bytes) default limit is
small.
This patch increase number of invalid bytes to size of 2 ALPS packets which
psmouse driver can drop before do full reset.
Resetting ALPS devices take some time and when doing reset on some Dell
laptops touchpad, trackstick and also keyboard do not respond. So it is
better to do it only if really necessary.
Signed-off-by: Pali Rohár <pali.rohar@xxxxxxxxx>
Tested-by: Pali Rohár <pali.rohar@xxxxxxxxx>
Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/input/mouse/alps.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/input/mouse/alps.c
+++ b/drivers/input/mouse/alps.c
@@ -2154,6 +2154,9 @@ int alps_init(struct psmouse *psmouse)
/* We are having trouble resyncing ALPS touchpads so disable it for now */
psmouse->resync_time = 0;
+ /* Allow 2 invalid packets without resetting device */
+ psmouse->resetafter = psmouse->pktsize * 2;
+
return 0;
init_fail:
Patches currently in stable-queue which might be from pali.rohar@xxxxxxxxx are
queue-3.14/input-alps-ignore-potential-bare-packets-when-device-is-out-of-sync.patch
queue-3.14/input-alps-ignore-bad-data-on-dell-latitudes-e6440-and-e7440.patch
queue-3.14/input-alps-allow-up-to-2-invalid-packets-without-resetting-device.patch
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