drm/i915/skl: CS flips are not supported with execlists

And skl only works in execlist mode, not in legacy ring submission.

Therefore remove dead code.
Signed-off-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -9631,69 +9631,6 @@ static int intel_queue_mmio_flip(struct drm_device *dev,
 	return 0;
 }
 
-static int intel_gen9_queue_flip(struct drm_device *dev,
-				 struct drm_crtc *crtc,
-				 struct drm_framebuffer *fb,
-				 struct drm_i915_gem_object *obj,
-				 struct intel_engine_cs *ring,
-				 uint32_t flags)
-{
-	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-	uint32_t plane = 0, stride;
-	int ret;
-
-	switch(intel_crtc->pipe) {
-	case PIPE_A:
-		plane = MI_DISPLAY_FLIP_SKL_PLANE_1_A;
-		break;
-	case PIPE_B:
-		plane = MI_DISPLAY_FLIP_SKL_PLANE_1_B;
-		break;
-	case PIPE_C:
-		plane = MI_DISPLAY_FLIP_SKL_PLANE_1_C;
-		break;
-	default:
-		WARN_ONCE(1, "unknown plane in flip command\n");
-		return -ENODEV;
-	}
-
-	switch (obj->tiling_mode) {
-	case I915_TILING_NONE:
-		stride = fb->pitches[0] >> 6;
-		break;
-	case I915_TILING_X:
-		stride = fb->pitches[0] >> 9;
-		break;
-	default:
-		WARN_ONCE(1, "unknown tiling in flip command\n");
-		return -ENODEV;
-	}
-
-	ret = intel_ring_begin(ring, 10);
-	if (ret)
-		return ret;
-
-	intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
-	intel_ring_emit(ring, DERRMR);
-	intel_ring_emit(ring, ~(DERRMR_PIPEA_PRI_FLIP_DONE |
-				DERRMR_PIPEB_PRI_FLIP_DONE |
-				DERRMR_PIPEC_PRI_FLIP_DONE));
-	intel_ring_emit(ring, MI_STORE_REGISTER_MEM_GEN8(1) |
-			      MI_SRM_LRM_GLOBAL_GTT);
-	intel_ring_emit(ring, DERRMR);
-	intel_ring_emit(ring, ring->scratch.gtt_offset + 256);
-	intel_ring_emit(ring, 0);
-
-	intel_ring_emit(ring, MI_DISPLAY_FLIP_I915 | plane);
-	intel_ring_emit(ring, stride << 6 | obj->tiling_mode);
-	intel_ring_emit(ring, intel_crtc->unpin_work->gtt_offset);
-
-	intel_mark_page_flip_active(intel_crtc);
-	__intel_ring_advance(ring);
-
-	return 0;
-}
-
 static int intel_default_queue_flip(struct drm_device *dev,
 				    struct drm_crtc *crtc,
 				    struct drm_framebuffer *fb,
@@ -12993,9 +12930,6 @@ static void intel_init_display(struct drm_device *dev)
 			valleyview_modeset_global_resources;
 	}
 
-	/* Default just returns -ENODEV to indicate unsupported */
-	dev_priv->display.queue_flip = intel_default_queue_flip;
-
 	switch (INTEL_INFO(dev)->gen) {
 	case 2:
 		dev_priv->display.queue_flip = intel_gen2_queue_flip;
@@ -13018,8 +12952,10 @@ static void intel_init_display(struct drm_device *dev)
 		dev_priv->display.queue_flip = intel_gen7_queue_flip;
 		break;
 	case 9:
-		dev_priv->display.queue_flip = intel_gen9_queue_flip;
-		break;
+		/* Drop through - unsupported since execlist only. */
+	default:
+		/* Default just returns -ENODEV to indicate unsupported */
+		dev_priv->display.queue_flip = intel_default_queue_flip;
 	}
 
 	intel_panel_init_backlight_funcs(dev);