DRM/i915: only use tiled blits on 965+
When scheduled swaps occur, we need to blit between front & back buffers. If the buffers are tiled, we need to set the appropriate XY_SRC_COPY tile bit, but only on 965 chips, since it will cause corruption on pre-965 (e.g. 945). Bug reported by and fix tested by Tomas Janousek <tomi@nomi.cz>. Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> Acked-by: Dave Airlie <airlied@linux.ie> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -62,11 +62,11 @@ static void i915_vblank_tasklet(struct drm_device *dev)
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u32 ropcpp = (0xcc << 16) | ((cpp - 1) << 24);
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RING_LOCALS;
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if (sarea_priv->front_tiled) {
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if (IS_I965G(dev) && sarea_priv->front_tiled) {
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cmd |= XY_SRC_COPY_BLT_DST_TILED;
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dst_pitch >>= 2;
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}
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if (sarea_priv->back_tiled) {
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if (IS_I965G(dev) && sarea_priv->back_tiled) {
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cmd |= XY_SRC_COPY_BLT_SRC_TILED;
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src_pitch >>= 2;
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}
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