[PATCH v2 19/27] drm/i915: atomic plane updates in a nutshell

[Maarten Lankhorst <maarten.lankhorst@linux.intel.com>]

Now that all planes are added during a modeset we can use the
calculated changes before disabling a plane, and then either commit
or force disable a plane before disabling the crtc.

The code is shared with atomic_begin/flush, except watermark updating
and vblank evasion are not used.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 128 +++++++----------------------------
 drivers/gpu/drm/i915/intel_sprite.c  |   4 +-
 2 files changed, 27 insertions(+), 105 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 3b5d23692935..d4ddcad7eaf1 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -109,8 +109,6 @@ static void skl_init_scalers(struct drm_device *dev, struct intel_crtc *intel_cr
 	struct intel_crtc_state *crtc_state);
 static int i9xx_get_refclk(const struct intel_crtc_state *crtc_state,
 			   int num_connectors);
-static void intel_crtc_enable_planes(struct drm_crtc *crtc);
-static void intel_crtc_disable_planes(struct drm_crtc *crtc);
 
 static struct intel_encoder *intel_find_encoder(struct intel_connector *connector, int pipe)
 {
@@ -2215,28 +2213,6 @@ static void intel_disable_pipe(struct intel_crtc *crtc)
 		intel_wait_for_pipe_off(crtc);
 }
 
-/**
- * intel_enable_primary_hw_plane - enable the primary plane on a given pipe
- * @plane:  plane to be enabled
- * @crtc: crtc for the plane
- *
- * Enable @plane on @crtc, making sure that the pipe is running first.
- */
-static void intel_enable_primary_hw_plane(struct drm_plane *plane,
-					  struct drm_crtc *crtc)
-{
-	struct drm_device *dev = plane->dev;
-	struct drm_i915_private *dev_priv = dev->dev_private;
-	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-
-	/* If the pipe isn't enabled, we can't pump pixels and may hang */
-	assert_pipe_enabled(dev_priv, intel_crtc->pipe);
-	to_intel_plane_state(plane->state)->visible = true;
-
-	dev_priv->display.update_primary_plane(crtc, plane->fb,
-					       crtc->x, crtc->y);
-}
-
 static bool need_vtd_wa(struct drm_device *dev)
 {
 #ifdef CONFIG_INTEL_IOMMU
@@ -4501,20 +4477,6 @@ static void ironlake_pfit_enable(struct intel_crtc *crtc)
 	}
 }
 
-static void intel_enable_sprite_planes(struct drm_crtc *crtc)
-{
-	struct drm_device *dev = crtc->dev;
-	enum pipe pipe = to_intel_crtc(crtc)->pipe;
-	struct drm_plane *plane;
-	struct intel_plane *intel_plane;
-
-	drm_for_each_legacy_plane(plane, &dev->mode_config.plane_list) {
-		intel_plane = to_intel_plane(plane);
-		if (intel_plane->pipe == pipe)
-			intel_plane_restore(&intel_plane->base);
-	}
-}
-
 void hsw_enable_ips(struct intel_crtc *crtc)
 {
 	struct drm_device *dev = crtc->base.dev;
@@ -4810,26 +4772,6 @@ static void intel_pre_plane_update(struct intel_crtc *crtc)
 		intel_pre_disable_primary(&crtc->base);
 }
 
-static void intel_crtc_enable_planes(struct drm_crtc *crtc)
-{
-	struct drm_device *dev = crtc->dev;
-	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-	int pipe = intel_crtc->pipe;
-
-	intel_enable_primary_hw_plane(crtc->primary, crtc);
-	intel_enable_sprite_planes(crtc);
-	intel_crtc_update_cursor(crtc, true);
-
-	intel_post_enable_primary(crtc);
-
-	/*
-	 * FIXME: Once we grow proper nuclear flip support out of this we need
-	 * to compute the mask of flip planes precisely. For the time being
-	 * consider this a flip to a NULL plane.
-	 */
-	intel_frontbuffer_flip(dev, INTEL_FRONTBUFFER_ALL_MASK(pipe));
-}
-
 static void intel_disable_planes_on_crtc(struct drm_crtc *c)
 {
 	struct intel_crtc *crtc = to_intel_crtc(c);
@@ -4840,27 +4782,6 @@ static void intel_disable_planes_on_crtc(struct drm_crtc *c)
 		to_intel_plane(plane)->disable_plane(plane, c);
 }
 
-static void intel_crtc_disable_planes(struct drm_crtc *crtc)
-{
-	struct drm_device *dev = crtc->dev;
-	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-	int pipe = intel_crtc->pipe;
-
-	intel_crtc_wait_for_pending_flips(crtc);
-
-	intel_pre_disable_primary(crtc);
-
-	intel_crtc_dpms_overlay_disable(intel_crtc);
-	intel_disable_planes_on_crtc(crtc);
-
-	/*
-	 * FIXME: Once we grow proper nuclear flip support out of this we need
-	 * to compute the mask of flip planes precisely. For the time being
-	 * consider this a flip to a NULL plane.
-	 */
-	intel_frontbuffer_flip(dev, INTEL_FRONTBUFFER_ALL_MASK(pipe));
-}
-
 static void ironlake_crtc_enable(struct drm_crtc *crtc)
 {
 	struct drm_device *dev = crtc->dev;
@@ -11552,10 +11473,6 @@ int intel_plane_atomic_calc_changes(struct drm_crtc_state *crtc_state,
 	if (old_plane_state->base.fb && !fb)
 		intel_crtc->atomic.disabled_planes |= 1 << i;
 
-	/* don't run rest during modeset yet */
-	if (!intel_crtc->active || mode_changed)
-		return 0;
-
 	if (to_intel_crtc_state(crtc_state)->quirks &
 	    PIPE_CONFIG_QUIRK_INITIAL_PLANES) {
 		if (!plane_state->crtc) {
@@ -12956,15 +12873,23 @@ static int __intel_set_mode(struct drm_atomic_state *state)
 	drm_atomic_helper_swap_state(dev, state);
 
 	for_each_crtc_in_state(state, crtc, crtc_state, i) {
+		struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+
 		if (!needs_modeset(crtc->state))
 			continue;
 
 		any_ms = true;
-		if (!crtc_state->active)
-			continue;
+		intel_pre_plane_update(intel_crtc);
+
+		if (crtc_state->active) {
+			intel_crtc_dpms_overlay_disable(intel_crtc);
+			intel_disable_planes_on_crtc(crtc);
+
+			/* XXX: Calculate mask here? */
+			intel_frontbuffer_flip(dev, INTEL_FRONTBUFFER_ALL_MASK(intel_crtc->pipe));
 
-		intel_crtc_disable_planes(crtc);
-		dev_priv->display.crtc_disable(crtc);
+			dev_priv->display.crtc_disable(crtc);
+		}
 	}
 
 	/* Only after disabling all output pipelines that will be changed can we
@@ -12978,15 +12903,12 @@ static int __intel_set_mode(struct drm_atomic_state *state)
 
 	/* Now enable the clocks, plane, pipe, and connectors that we set up. */
 	for_each_crtc_in_state(state, crtc, crtc_state, i) {
-		drm_atomic_helper_commit_planes_on_crtc(crtc_state);
-
-		if (!needs_modeset(crtc->state) || !crtc->state->active)
-			continue;
-
-		update_scanline_offset(to_intel_crtc(crtc));
+		if (needs_modeset(crtc->state) && crtc->state->active) {
+			update_scanline_offset(to_intel_crtc(crtc));
+			dev_priv->display.crtc_enable(crtc);
+		}
 
-		dev_priv->display.crtc_enable(crtc);
-		intel_crtc_enable_planes(crtc);
+		drm_atomic_helper_commit_planes_on_crtc(crtc_state);
 	}
 
 	/* FIXME: add subpixel order */
@@ -13524,7 +13446,7 @@ intel_commit_primary_plane(struct drm_plane *plane,
 	crtc->x = src->x1 >> 16;
 	crtc->y = src->y1 >> 16;
 
-	if (!intel_crtc->active)
+	if (!crtc->state->active)
 		return;
 
 	if (state->visible)
@@ -13550,7 +13472,8 @@ static void intel_begin_crtc_commit(struct drm_crtc *crtc)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 
-	intel_pre_plane_update(intel_crtc);
+	if (!needs_modeset(crtc->state))
+		intel_pre_plane_update(intel_crtc);
 
 	if (intel_crtc->atomic.update_wm)
 		intel_update_watermarks(crtc);
@@ -13558,17 +13481,18 @@ static void intel_begin_crtc_commit(struct drm_crtc *crtc)
 	intel_runtime_pm_get(dev_priv);
 
 	/* Perform vblank evasion around commit operation */
-	if (crtc->state->active && !needs_modeset(crtc->state)) {
+	if (crtc->state->active)
 		intel_crtc->atomic.evade =
 			intel_pipe_update_start(intel_crtc,
 						&intel_crtc->atomic.start_vbl_count);
 
+	if (!needs_modeset(crtc->state)) {
+		if (INTEL_INFO(dev)->gen >= 9)
+			skl_detach_scalers(intel_crtc);
+
 		if (intel_crtc->atomic.force_disabled_planes)
 			intel_disable_planes_on_crtc(crtc);
 	}
-
-	if (!needs_modeset(crtc->state) && INTEL_INFO(dev)->gen >= 9)
-                skl_detach_scalers(intel_crtc);
 }
 
 static void intel_finish_crtc_commit(struct drm_crtc *crtc)
@@ -13770,7 +13694,7 @@ intel_commit_cursor_plane(struct drm_plane *plane,
 	intel_crtc->cursor_bo = obj;
 
 update:
-	if (intel_crtc->active)
+	if (crtc->state->active)
 		intel_crtc_update_cursor(crtc, state->visible);
 }
 
diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
index 2a6cfac210cb..49d867a8b073 100644
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/drivers/gpu/drm/i915/intel_sprite.c
@@ -919,16 +919,14 @@ intel_commit_sprite_plane(struct drm_plane *plane,
 			  struct intel_plane_state *state)
 {
 	struct drm_crtc *crtc = state->base.crtc;
-	struct intel_crtc *intel_crtc;
 	struct intel_plane *intel_plane = to_intel_plane(plane);
 	struct drm_framebuffer *fb = state->base.fb;
 
 	crtc = crtc ? crtc : plane->crtc;
-	intel_crtc = to_intel_crtc(crtc);
 
 	plane->fb = fb;
 
-	if (!intel_crtc->active)
+	if (!crtc->state->active)
 		return;
 
 	if (state->visible) {
-- 
2.1.0

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