drm/bochs: disable video before changing video mode

qemu and simics simulators both seem to expect that video should be disabled
before changing the video mode.

references:
http://git.qemu.org/?p=qemu.git;a=blob;f=hw/display/vga.c;h=c0f7b343bbab586c8593d29c7a765f1e6ca3662c;hb=HEAD#l727
http://wiki.osdev.org/Bochs_VBE_Extensions#Setting_display_resolution_and_bit_depth

Signed-off-by: Chris Ruffin <chris.ruffin@intel.com>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/gpu/drm/bochs/bochs_hw.c b/drivers/gpu/drm/bochs/bochs_hw.c
index 460389702d31..a39b0343c197 100644
--- a/drivers/gpu/drm/bochs/bochs_hw.c
+++ b/drivers/gpu/drm/bochs/bochs_hw.c
@@ -164,6 +164,7 @@ void bochs_hw_setmode(struct bochs_device *bochs,
 
         bochs_vga_writeb(bochs, 0x3c0, 0x20); /* unblank */
 
+        bochs_dispi_write(bochs, VBE_DISPI_INDEX_ENABLE,      0);
         bochs_dispi_write(bochs, VBE_DISPI_INDEX_BPP,         bochs->bpp);
         bochs_dispi_write(bochs, VBE_DISPI_INDEX_XRES,        bochs->xres);
         bochs_dispi_write(bochs, VBE_DISPI_INDEX_YRES,        bochs->yres);