From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> For unfathomable reasons this alignment appears to be required for tiled scanouts being read from stolen memory. I can find no reference in the w/a db to support this requirement, but the evidence of my own eyes says this prevents many headaches. Note that I have not tricked anything older than Sandybridge into using stolen tiled scanouts, so the extra alignment may be required there as well. Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/intel_display.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 0da0ead1..cee9c0d 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -1837,6 +1837,8 @@ intel_pin_and_fence_fb_obj(struct drm_device *dev, case I915_TILING_X: /* pin() will align the object as required by fence */ alignment = 0; + if (obj->stolen && INTEL_INFO(dev)->gen >= 6) + alignment = 256 * 1024; break; case I915_TILING_Y: /* Despite that we check this in framebuffer_init userspace can -- 1.8.1.4 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
