Re: [PATCH 1/2] drm: add plane support v2

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Tue, Nov 15, 2011 at 12:40:43PM +1000, Ben Skeggs wrote:
> On Mon, 2011-11-14 at 12:21 -0800, Jesse Barnes wrote:
> > Planes are a bit like half-CRTCs.  They have a location and fb, but
> > don't drive outputs directly.  Add support for handling them to the core
> > KMS code.
> Out of curiosity, lets say you have a *really* stupid hardware overlay
> that can't do scaling (or even, has limited scaling capabilities),
> should we provide some way to expose this to userspace?

I think yes. In fact I'd like drm_plane to replace drm_crtc as far as
scanout is concerned. That's how a lot of embedded hardware is laid
out already, and I think it's a lot cleaner approach than what we
have currently. Stuff like borders then become a simple matter or
positioning the "CRTC plane" within the larger active video area,
and panel fitters could be exposed through drm_plane scaling.

Se either we need to think ahead more with the GETPLANE ioctl
structure, or we could add a PLANE_CAPS ioctl later to expose
additional details about the hardware.

-- 
Ville Syrjälä
Intel OTC