Re: [PATCH] drm/i915: fix up ivb plane 3 pageflips

[Ben Widawsky <ben@bwidawsk.net>]

On Tue, 5 Jun 2012 10:56:58 +0200
Daniel Vetter <daniel@ffwll.ch> wrote:

> On Wed, May 23, 2012 at 02:02:00PM +0200, Daniel Vetter wrote:
> > Or at least plug another gapping hole. Apparrently hw desingers only
> > moved the bit field, but did not bother ot re-enumerate the planes
> > when adding support for a 3rd pipe.
> > 
> > Discovered by i-g-t/flip_test.
> > 
> > This may or may not fix the reference bugzilla, because that one
> > smells like we have still larger fish to fry.
> > 
> > v2: Fixup the impossible case to catch programming errors, noticed by
> > Chris Wilson.
> > 
> > References: https://bugs.freedesktop.org/show_bug.cgi?id=50069
> > Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> 
> Ping for review and maybe a tested-by. This fixes i-g-t/tests/flip_test on
> my ivb, but for some strange reasons QA can't confirm that. Still, I'd
> like to push this patch to -fixes. Eugeni, Ben?
> 
> Thanks, Daniel

I'm starting to review it. I need to do some background reading first.

> 
> > ---
> >  drivers/gpu/drm/i915/i915_reg.h      |    8 ++++++++
> >  drivers/gpu/drm/i915/intel_display.c |   19 ++++++++++++++++++-
> >  2 files changed, 26 insertions(+), 1 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> > index 2d49b95..76bc275 100644
> > --- a/drivers/gpu/drm/i915/i915_reg.h
> > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > @@ -210,6 +210,14 @@
> >  #define MI_DISPLAY_FLIP		MI_INSTR(0x14, 2)
> >  #define MI_DISPLAY_FLIP_I915	MI_INSTR(0x14, 1)
> >  #define   MI_DISPLAY_FLIP_PLANE(n) ((n) << 20)
> > +/* IVB has funny definitions for which plane to flip. */
> > +#define   MI_DISPLAY_FLIP_IVB_PLANE_A  (0 << 19)
> > +#define   MI_DISPLAY_FLIP_IVB_PLANE_B  (1 << 19)
> > +#define   MI_DISPLAY_FLIP_IVB_SPRITE_A (2 << 19)
> > +#define   MI_DISPLAY_FLIP_IVB_SPRITE_B (3 << 19)
> > +#define   MI_DISPLAY_FLIP_IVB_PLANE_C  (4 << 19)
> > +#define   MI_DISPLAY_FLIP_IVB_SPRITE_C (5 << 19)
> > +
> >  #define MI_SET_CONTEXT		MI_INSTR(0x18, 0)
> >  #define   MI_MM_SPACE_GTT		(1<<8)
> >  #define   MI_MM_SPACE_PHYSICAL		(0<<8)
> > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > index 67ed819..9a6e819 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -6158,17 +6158,34 @@ static int intel_gen7_queue_flip(struct drm_device *dev,
> >  	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];
> > +	uint32_t plane_bit = 0;
> >  	int ret;
> >  
> >  	ret = intel_pin_and_fence_fb_obj(dev, obj, ring);
> >  	if (ret)
> >  		goto err;
> >  
> > +	switch(intel_crtc->plane) {
> > +	case PLANE_A:
> > +		plane_bit = MI_DISPLAY_FLIP_IVB_PLANE_A;
> > +		break;
> > +	case PLANE_B:
> > +		plane_bit = MI_DISPLAY_FLIP_IVB_PLANE_B;
> > +		break;
> > +	case PLANE_C:
> > +		plane_bit = MI_DISPLAY_FLIP_IVB_PLANE_C;
> > +		break;
> > +	default:
> > +		WARN_ONCE(1, "unknown plane in flip command\n");
> > +		ret = -ENODEV;
> > +		goto err;
> > +	}
> > +
> >  	ret = intel_ring_begin(ring, 4);
> >  	if (ret)
> >  		goto err_unpin;
> >  
> > -	intel_ring_emit(ring, MI_DISPLAY_FLIP_I915 | (intel_crtc->plane << 19));
> > +	intel_ring_emit(ring, MI_DISPLAY_FLIP_I915 | plane_bit);
> >  	intel_ring_emit(ring, (fb->pitches[0] | obj->tiling_mode));
> >  	intel_ring_emit(ring, (obj->gtt_offset));
> >  	intel_ring_emit(ring, (MI_NOOP));
> > -- 
> > 1.7.9
> > 
> 



-- 
Ben Widawsky, Intel Open Source Technology Center