From: popcornmix <popcornmix@gmail.com>
Date: Mon, 14 Jul 2014 21:02:09 +0000 (+0100)
Subject: hid: Reduce default mouse polling interval to 60Hz
X-Git-Tag: archive/raspbian/4.9.13-1+rpi1~9^2~141
X-Git-Url: https://dgit.raspbian.org/%22http://www.example.com/cgi/%22/%22http:/www.example.com/cgi/%22?a=commitdiff_plain;h=b45c0448b60d691508251cdccf242ea43bbabb14;p=linux-4.9.git

hid: Reduce default mouse polling interval to 60Hz

Reduces overhead when using X
---

diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index ae83af649a60..4a7af9d0b910 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -49,7 +49,7 @@
  * Module parameters.
  */
 
-static unsigned int hid_mousepoll_interval;
+static unsigned int hid_mousepoll_interval = ~0;
 module_param_named(mousepoll, hid_mousepoll_interval, uint, 0644);
 MODULE_PARM_DESC(mousepoll, "Polling interval of mice");
 
@@ -1083,8 +1083,12 @@ static int usbhid_start(struct hid_device *hid)
 		}
 
 		/* Change the polling interval of mice. */
-		if (hid->collection->usage == HID_GD_MOUSE && hid_mousepoll_interval > 0)
-			interval = hid_mousepoll_interval;
+		if (hid->collection->usage == HID_GD_MOUSE) {
+				if (hid_mousepoll_interval == ~0 && interval < 16)
+						interval = 16;
+				else if (hid_mousepoll_interval != ~0 && hid_mousepoll_interval != 0)
+						interval = hid_mousepoll_interval;
+		}
 
 		ret = -ENOMEM;
 		if (usb_endpoint_dir_in(endpoint)) {