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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>
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@ -164,6 +164,7 @@ void bochs_hw_setmode(struct bochs_device *bochs,
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bochs_vga_writeb(bochs, 0x3c0, 0x20); /* unblank */
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bochs_dispi_write(bochs, VBE_DISPI_INDEX_ENABLE, 0);
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bochs_dispi_write(bochs, VBE_DISPI_INDEX_BPP, bochs->bpp);
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bochs_dispi_write(bochs, VBE_DISPI_INDEX_XRES, bochs->xres);
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bochs_dispi_write(bochs, VBE_DISPI_INDEX_YRES, bochs->yres);
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