cirrusfb: add imageblit function
Add hardware color expansion (imageblit) function. It roughly doubles scrolling speed of my Alpine card (GD5430). Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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