Patch "Revert "HID: multitouch: enable palm rejection if device implements confidence usage"" has been added to the 4.6-stable tree

Patch "Revert "HID: multitouch: enable palm rejection if device implements confidence usage"" has been added to the 4.6-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    Revert "HID: multitouch: enable palm rejection if device implements confidence usage"

to the 4.6-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:
     revert-hid-multitouch-enable-palm-rejection-if-device-implements-confidence-usage.patch
and it can be found in the queue-4.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 62630ea768869beeb1e514b0bf5607a0c9b93d12 Mon Sep 17 00:00:00 2001
From: Allen Hung <allen_hung@dell.com>
Date: Thu, 23 Jun 2016 16:31:29 +0800
Subject: Revert "HID: multitouch: enable palm rejection if device implements confidence usage"

From: Allen Hung <allen_hung@dell.com>

commit 62630ea768869beeb1e514b0bf5607a0c9b93d12 upstream.

This reverts commit 25a84db15b3f ("HID: multitouch: enable palm rejection
if device implements confidence usage")

The commit enables palm rejection for Win8 Precision Touchpad devices but
the quirk MT_QUIRK_VALID_IS_CONFIDENCE it is using is not working very
properly. This quirk is originally designed for some WIn7 touchscreens. Use
of this for a Win8 Precision Touchpad will cause unexpected pointer jumping
problem.

Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Tested-by: Andy Lutomirski <luto@kernel.org> # XPS 13 9350, BIOS 1.4.3
Signed-off-by: Allen Hung <allen_hung@dell.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/hid/hid-multitouch.c |    5 -----
 1 file changed, 5 deletions(-)

--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -502,11 +502,6 @@ static int mt_touch_input_mapping(struct
 			mt_store_field(usage, td, hi);
 			return 1;
 		case HID_DG_CONFIDENCE:
-			if (cls->name == MT_CLS_WIN_8 &&
-				field->application == HID_DG_TOUCHPAD) {
-				cls->quirks &= ~MT_QUIRK_ALWAYS_VALID;
-				cls->quirks |= MT_QUIRK_VALID_IS_CONFIDENCE;
-			}
 			mt_store_field(usage, td, hi);
 			return 1;
 		case HID_DG_TIPSWITCH:


Patches currently in stable-queue which might be from allen_hung@dell.com are

queue-4.6/hid-multitouch-enable-palm-rejection-for-windows-precision-touchpad.patch
queue-4.6/revert-hid-multitouch-enable-palm-rejection-if-device-implements-confidence-usage.patch