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MFC r270299 (dumbbell): vt_vga: When clearing video memory, don't read from it

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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.

Sponsored by:	The FreeBSD Foundation
This commit is contained in:
emaste 2014-09-04 19:22:01 +00:00
parent f4cd1af86e
commit c3376ddfe1
1 changed files with 0 additions and 1 deletions
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sys/dev/vt/hw/vga/vt_vga.c
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@ -609,7 +609,6 @@ vga_initialize(struct vt_device *vd, int textmode)
* planes. * planes.
*/ */
for (ofs = 0; ofs < VT_VGA_MEMSIZE; ofs++) { for (ofs = 0; ofs < VT_VGA_MEMSIZE; ofs++) {
MEM_READ1(sc, ofs);
MEM_WRITE1(sc, ofs, 0); MEM_WRITE1(sc, ofs, 0);
} }
} }