Each interrupt contains information for all contacts with changing
properties.  Process all of this information at once, and send it all in a
a single input report (ie input events ending in EV_SYN/SYN_REPORT).

This patch was tested using an MXT224E.

Signed-off-by: Daniel Kurtz <redacted>
---
 drivers/input/touchscreen/atmel_mxt_ts.c |   11 ++++++++---
 1 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index be1e2ec..d8b23ad 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c

@@ -532,9 +532,6 @@ static void mxt_input_touch(struct mxt_data *data, struct mxt_message *message)
 		input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, area);
 		/* TODO: Use vector to report ORIENTATION & TOUCH_MINOR */
 	}
-
-	input_mt_report_pointer_emulation(input_dev, false);
-	input_sync(input_dev);
 }
 
 static irqreturn_t mxt_interrupt(int irq, void *dev_id)

@@ -542,7 +539,9 @@ static irqreturn_t mxt_interrupt(int irq, void *dev_id)
 	struct mxt_data *data = dev_id;
 	struct mxt_message message;
 	struct device *dev = &data->client->dev;
+	bool update_input;
 
+	update_input = false;
 	do {
 		if (mxt_read_message(data, &message)) {
 			dev_err(dev, "Failed to read message\n");

@@ -552,11 +551,17 @@ static irqreturn_t mxt_interrupt(int irq, void *dev_id)
 		if (message.reportid >= data->T9_reportid_min &&
 		    message.reportid <= data->T9_reportid_max) {
 			mxt_input_touch(data, &message);
+			update_input = true;
 		} else {
 			mxt_dump_message(dev, &message);
 		}
 	} while (message.reportid != 0xff);
 
+	if (update_input) {
+		input_mt_report_pointer_emulation(data->input_dev, false);
+		input_sync(data->input_dev);
+	}
+