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);
}
}
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