From owner-svn-src-head@FreeBSD.ORG  Thu Aug 21 20:10:06 2014
Return-Path: <owner-svn-src-head@FreeBSD.ORG>
Delivered-To: svn-src-head@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 92A1A9E5;
 Thu, 21 Aug 2014 20:10:06 +0000 (UTC)
Received: from svn.freebsd.org (svn.freebsd.org
 [IPv6:2001:1900:2254:2068::e6a:0])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id 7DF503136;
 Thu, 21 Aug 2014 20:10:06 +0000 (UTC)
Received: from svn.freebsd.org ([127.0.1.70])
 by svn.freebsd.org (8.14.9/8.14.9) with ESMTP id s7LKA67V060244;
 Thu, 21 Aug 2014 20:10:06 GMT (envelope-from dumbbell@FreeBSD.org)
Received: (from dumbbell@localhost)
 by svn.freebsd.org (8.14.9/8.14.9/Submit) id s7LKA65M060243;
 Thu, 21 Aug 2014 20:10:06 GMT (envelope-from dumbbell@FreeBSD.org)
Message-Id: <201408212010.s7LKA65M060243@svn.freebsd.org>
X-Authentication-Warning: svn.freebsd.org: dumbbell set sender to
 dumbbell@FreeBSD.org using -f
From: Jean-Sebastien Pedron <dumbbell@FreeBSD.org>
Date: Thu, 21 Aug 2014 20:10:06 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: svn commit: r270299 - head/sys/dev/vt/hw/vga
X-SVN-Group: head
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
X-BeenThere: svn-src-head@freebsd.org
X-Mailman-Version: 2.1.18-1
Precedence: list
List-Id: SVN commit messages for the src tree for head/-current
 <svn-src-head.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-head/>
List-Post: <mailto:svn-src-head@freebsd.org>
List-Help: <mailto:svn-src-head-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 21 Aug 2014 20:10:06 -0000

Author: dumbbell
Date: Thu Aug 21 20:10:05 2014
New Revision: 270299
URL: http://svnweb.freebsd.org/changeset/base/270299

Log:
  vt_vga: When clearing video memory, don't read from it
  
  The goal is to clear the video memory, in case an application drew to
  it. So the content shouldn't be loaded in the latches, it can't be
  trusted anyway.
  
  This improves a bit the window switch speed.
  
  MFC after:	1 week

Modified:
  head/sys/dev/vt/hw/vga/vt_vga.c

Modified: head/sys/dev/vt/hw/vga/vt_vga.c
==============================================================================
--- head/sys/dev/vt/hw/vga/vt_vga.c	Thu Aug 21 19:58:46 2014	(r270298)
+++ head/sys/dev/vt/hw/vga/vt_vga.c	Thu Aug 21 20:10:05 2014	(r270299)
@@ -604,7 +604,6 @@ vga_initialize(struct vt_device *vd, int
 		 * planes.
 		 */
 		for (ofs = 0; ofs < VT_VGA_MEMSIZE; ofs++) {
-			MEM_READ1(sc, ofs);
 			MEM_WRITE1(sc, ofs, 0);
 		}
 	}