[Intel-gfx] [PATCH 2/4] drm/i915: add plane enable/disable functions

[Jesse Barnes]

On Thu, 30 Dec 2010 21:34:46 +0000
Chris Wilson <chris at chris-wilson.co.uk> wrote:

> Trivial comment, on passing...
> 
> On Thu, 30 Dec 2010 13:16:30 -0800, Jesse Barnes <jbarnes at virtuousgeek.org> wrote:
> > Add plane enable/disable functions to prevent duplicated code and allow
> > us to easily check for plane enable/disable requirements (such as pipe
> > enable).
> 
> > +static void intel_disable_plane(struct drm_i915_private *dev_priv,
> > +				enum plane plane, enum pipe pipe)
> > +{
> > +	int reg;
> > +	u32 val;
> > +
> > +	reg = DSPCNTR(plane);
> > +	val = I915_READ(reg);
> > +	val &= ~DISPLAY_PLANE_ENABLE;
> > +	I915_WRITE(reg, val);
> > +	POSTING_READ(reg);
> 
> > +	reg = DSPADDR(plane);
> > +	I915_WRITE(reg, I915_READ(reg)); /* trigger an update */
> 
> Use intel_flush_display_plane(dev_priv, plane); though maybe that function
> becomes redundant? Unlikely...

It was only used in one place after I added this, so I just stuffed the
update trigger into this function and deleted flush_display_plane.

-- 
Jesse Barnes, Intel Open Source Technology Center