Re: [PATCH 2/2] drm/i915: add Ivy Bridge page flip support

[Jesse Barnes <jbarnes@virtuousgeek.org>]

On Tue, 14 Jun 2011 19:22:33 +0100
Chris Wilson <chris@chris-wilson.co.uk> wrote:

> On Tue, 14 Jun 2011 11:13:08 -0700, Jesse Barnes <jbarnes@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@virtuousgeek.org>
> > ---
> >  drivers/gpu/drm/i915/intel_display.c |   25 +++++++++++++++++++++++++
> >  1 files changed, 25 insertions(+), 0 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > index 06748f3a..3d095de 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -6379,6 +6379,28 @@ 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(&dev_priv->ring[BCS], 4);
> > +	if (ret)
> > +		goto out;
> > +
> > +	intel_ring_emit(&dev_priv->ring[BCS], (MI_DISPLAY_FLIP_I915 | (intel_crtc->plane << 19)) | (1 << 17));
> What's the magic number? 80 column limit?
> -Chris

All good points.  See the updated patches.

Thanks,
-- 
Jesse Barnes, Intel Open Source Technology Center