[Intel-gfx] [PATCH 11/22] drm/i915: Don't pass plane+plane_state to intel_pin_and_fence_fb_obj()

[Ville Syrjälä]

On Thu, Oct 15, 2015 at 10:08:53AM +0100, Chris Wilson wrote:
> On Wed, Oct 14, 2015 at 07:29:03PM +0300, ville.syrjala at linux.intel.com wrote:
> > From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > 
> > intel_pin_and_fence_fb_obj() only needs the framebuffer, and the desird
> > rotation (to find the right GTT view for it), so no need to pass all
> > kinds of plane stuff.
> 
> imho this is a mistep, I think using the plane-state to not only pass
> the full description of the plane being bound (which may have additional
> information like the need for fencing for fbc as well as alternative
> views, i.e. it is a lot more versatile) but also allows us to track the
> binding for the plane-state and tie the VMA to lifetime of the plane.
> 
> i.e. I think intel_pin_and_fence_fb_obj would be better described as
> intel_plane_state_pin_vma (and correspondingly
> intel_plane_state_unpin_vma).
> 
> Yes, intel_fbdev.c is a wart to any proposed interface.

The current code is just too ugly to live IMO (due to fbdev, yes), so
I think we want this for now. We can always wrap it up in fancier
clothing for users that actually have a plane state once someone comes
up with some real code that needs it.

-- 
Ville Syrjälä
Intel OTC