[Intel-gfx] [PATCH 2/2] drm/i915: add Ivy Bridge page flip support

[Jesse Barnes]

On Tue, 14 Jun 2011 12:34:54 -0700
Jesse Barnes <jbarnes at virtuousgeek.org> wrote:

> Use the blit ring for submitting flips since the render ring doesn't
> generate flip complete interrupts.
> 
> Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
> ---
>  drivers/gpu/drm/i915/intel_display.c |   26 ++++++++++++++++++++++++++
>  1 files changed, 26 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 0fb0b0c..d40fcd0 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -6379,6 +6379,29 @@ out:
>  	return ret;
>  }
>  
> +static int intel_gen7_queue_flip(struct drm_device *dev,
> +				 struct drm_crtc *crtc,
> +				 struct drm_framebuffer *fb,
> +				 struct drm_i915_gem_object *obj)
> +{
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> +	struct intel_ring_buffer *ring = &dev_priv->ring[BCS];
> +	int ret;
> +
> +	ret = intel_ring_begin(ring, 4);
> +	if (ret)
> +		goto out;
> +
> +	intel_ring_emit(ring, MI_DISPLAY_FLIP_I915 | (intel_crtc->plane << 19));
> +	intel_ring_emit(ring, (fb->pitch | obj->tiling_mode));
> +	intel_ring_emit(ring, (obj->gtt_offset));
> +	intel_ring_emit(ring, (MI_NOOP));
> +	intel_ring_advance(ring);
> +out:
> +	return ret;
> +}

Oh and suggestions on how to track the BO properly through the BLT ring
appreciated...  I think that's the last missing piece.

-- 
Jesse Barnes, Intel Open Source Technology Center