artist: Emulate screen blanking

The misc_video and misc_ctrl registers control the visibility of the
screen. Start with the screen turned on, and hide or show the screen
based on the control registers.

Signed-off-by: Helge Deller <deller@gmx.de>
Acked-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
1 file changed