linux-kernel - [PATCH] Input: MT - add input sync to refresh touch points after screen locked

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Message-ID: <20250427021203.1888063-1-aichao@kylinos.cn>
Date: Sun, 27 Apr 2025 10:12:03 +0800
From: Ai Chao <aichao@...inos.cn>
To: rydberg@...math.org,
	dmitry.torokhov@...il.com
Cc: linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Ai Chao <aichao@...inos.cn>
Subject: [PATCH] Input: MT - add input sync to refresh touch points after screen locked

If the touchscreen support ten-figers press it to lock touchscreen. When
the touchscreen is locked, the ABS_MT_TRACKING_ID event remains
buffered. We need to used input-sync to refresh the event buffer.

Signed-off-by: Ai Chao <aichao@...inos.cn>
---
 drivers/input/input-mt.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/input/input-mt.c b/drivers/input/input-mt.c
index 337006dd9dcf..659d752ca830 100644
--- a/drivers/input/input-mt.c
+++ b/drivers/input/input-mt.c
@@ -147,6 +147,7 @@ bool input_mt_report_slot_state(struct input_dev *dev,
 
 	if (!active) {
 		input_event(dev, EV_ABS, ABS_MT_TRACKING_ID, -1);
+		input_sync(dev);
 		return false;
 	}
 
-- 
2.47.1