linux-kernel - [PATCH 4.7 047/186] [media] sur40: lower poll interval to fix occasional FPS drops to ~56 FPS

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Message-Id: <20160818135934.184478642@linuxfoundation.org>
Date:	Thu, 18 Aug 2016 15:57:44 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Martin Kaltenbrunner <modin@...i.at>,
	Florian Echtler <floe@...terbrot.org>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Mauro Carvalho Chehab <mchehab@...pensource.com>
Subject: [PATCH 4.7 047/186] [media] sur40: lower poll interval to fix occasional FPS drops to ~56 FPS

4.7-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Florian Echtler <floe@...terbrot.org>

commit af766ee005c496b8567976dc3eed7676443ed6de upstream.

The framerate sometimes drops below 60 Hz if the poll interval is too high.
Lowering it to the minimum of 1 ms fixes this.

Signed-off-by: Martin Kaltenbrunner <modin@...i.at>
Signed-off-by: Florian Echtler <floe@...terbrot.org>
Signed-off-by: Hans Verkuil <hans.verkuil@...co.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...pensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/input/touchscreen/sur40.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/input/touchscreen/sur40.c
+++ b/drivers/input/touchscreen/sur40.c
@@ -126,7 +126,7 @@ struct sur40_image_header {
 #define VIDEO_PACKET_SIZE  16384
 
 /* polling interval (ms) */
-#define POLL_INTERVAL 4
+#define POLL_INTERVAL 1
 
 /* maximum number of contacts FIXME: this is a guess? */
 #define MAX_CONTACTS 64