drm/i915: Set persistent-mode for ILK/SNB framebuffer compression
Persistent mode is intended for use with front-buffer rendering, such as X, where it is necessary to detect writes to the scanout either by the GPU or through the CPU's fence, and recompress the dirty regions on the fly. (By comparison to the back-buffer rendering, the scanout is always recompressed after a page-flip.) References: https://bugs.freedesktop.org/show_bug.cgi?id=33487 References: https://bugs.freedesktop.org/show_bug.cgi?id=31742Signed-off-by: NBen Widawsky <ben@bwidawsk.net> Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Reviewed-by: NJesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: NKeith Packard <keithp@keithp.com>
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