drm/i915: Partial revert of atomic watermark series

It's been reported that the atomic watermark series triggers some
regressions on SKL, which we haven't been able to track down yet.  Let's
temporarily revert these patches while we track down the root cause.

This commit squashes the reverts of:
  76305b1a drm/i915: Calculate watermark configuration during atomic check (v2)
  a4611e44 drm/i915: Don't set plane visible during HW readout if CRTC is off
  a28170f3 drm/i915: Calculate ILK-style watermarks during atomic check (v3)
  de4a9f83 drm/i915: Calculate pipe watermarks into CRTC state (v3)
  de165e0b drm/i915: Refactor ilk_update_wm (v3)

Reference: http://lists.freedesktop.org/archives/intel-gfx/2015-October/077190.html
Cc: "Zanoni, Paulo R" <paulo.r.zanoni@intel.com>
Cc: "Vetter, Daniel" <daniel.vetter@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_drv.h

@@ -627,8 +627,6 @@ struct drm_i915_display_funcs {
 			  int target, int refclk,
 			  struct dpll *match_clock,
 			  struct dpll *best_clock);
-	int (*compute_pipe_wm)(struct intel_crtc *crtc,
-			       struct drm_atomic_state *state);
 	void (*update_wm)(struct drm_crtc *crtc);
 	int (*modeset_calc_cdclk)(struct drm_atomic_state *state);
 	void (*modeset_commit_cdclk)(struct drm_atomic_state *state);
@@ -1692,13 +1690,6 @@ struct i915_execbuffer_params {
 	struct drm_i915_gem_request     *request;
 };
 
-/* used in computing the new watermarks state */
-struct intel_wm_config {
-	unsigned int num_pipes_active;
-	bool sprites_enabled;
-	bool sprites_scaled;
-};
-
 struct drm_i915_private {
 	struct drm_device *dev;
 	struct kmem_cache *objects;
@@ -1924,9 +1915,6 @@ struct drm_i915_private {
 		 */
 		uint16_t skl_latency[8];
 
-		/* Committed wm config */
-		struct intel_wm_config config;
-
 		/*
 		 * The skl_wm_values structure is a bit too big for stack
 		 * allocation, so we keep the staging struct where we store

drivers/gpu/drm/i915/intel_display.c

@@ -11836,12 +11836,6 @@ static int intel_crtc_atomic_check(struct drm_crtc *crtc,
 	}
 
 	ret = 0;
-	if (dev_priv->display.compute_pipe_wm) {
-		ret = dev_priv->display.compute_pipe_wm(intel_crtc, state);
-		if (ret)
-			return ret;
-	}
-
 	if (INTEL_INFO(dev)->gen >= 9) {
 		if (mode_changed)
 			ret = skl_update_scaler_crtc(pipe_config);
@@ -13047,45 +13041,6 @@ static int intel_modeset_checks(struct drm_atomic_state *state)
 	return 0;
 }
 
-/*
- * Handle calculation of various watermark data at the end of the atomic check
- * phase.  The code here should be run after the per-crtc and per-plane 'check'
- * handlers to ensure that all derived state has been updated.
- */
-static void calc_watermark_data(struct drm_atomic_state *state)
-{
-	struct drm_device *dev = state->dev;
-	struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
-	struct drm_crtc *crtc;
-	struct drm_crtc_state *cstate;
-	struct drm_plane *plane;
-	struct drm_plane_state *pstate;
-
-	/*
-	 * Calculate watermark configuration details now that derived
-	 * plane/crtc state is all properly updated.
-	 */
-	drm_for_each_crtc(crtc, dev) {
-		cstate = drm_atomic_get_existing_crtc_state(state, crtc) ?:
-			crtc->state;
-
-		if (cstate->active)
-			intel_state->wm_config.num_pipes_active++;
-	}
-	drm_for_each_legacy_plane(plane, dev) {
-		pstate = drm_atomic_get_existing_plane_state(state, plane) ?:
-			plane->state;
-
-		if (!to_intel_plane_state(pstate)->visible)
-			continue;
-
-		intel_state->wm_config.sprites_enabled = true;
-		if (pstate->crtc_w != pstate->src_w >> 16 ||
-		    pstate->crtc_h != pstate->src_h >> 16)
-			intel_state->wm_config.sprites_scaled = true;
-	}
-}
-
 /**
  * intel_atomic_check - validate state object
  * @dev: drm device
@@ -13094,7 +13049,6 @@ static void calc_watermark_data(struct drm_atomic_state *state)
 static int intel_atomic_check(struct drm_device *dev,
 			      struct drm_atomic_state *state)
 {
-	struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
 	struct drm_crtc *crtc;
 	struct drm_crtc_state *crtc_state;
 	int ret, i;
@@ -13158,15 +13112,10 @@ static int intel_atomic_check(struct drm_device *dev,
 		if (ret)
 			return ret;
 	} else
-		intel_state->cdclk = to_i915(state->dev)->cdclk_freq;
-
-	ret = drm_atomic_helper_check_planes(state->dev, state);
-	if (ret)
-		return ret;
-
-	calc_watermark_data(state);
+		to_intel_atomic_state(state)->cdclk =
+			to_i915(state->dev)->cdclk_freq;
 
-	return 0;
+	return drm_atomic_helper_check_planes(state->dev, state);
 }
 
 /**
@@ -13206,7 +13155,6 @@ static int intel_atomic_commit(struct drm_device *dev,
 		return ret;
 
 	drm_atomic_helper_swap_state(dev, state);
-	dev_priv->wm.config = to_intel_atomic_state(state)->wm_config;
 
 	for_each_crtc_in_state(state, crtc, crtc_state, i) {
 		struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
@@ -15220,7 +15168,7 @@ static void readout_plane_state(struct intel_crtc *crtc)
 	struct intel_plane_state *plane_state =
 		to_intel_plane_state(primary->state);
 
-	plane_state->visible = crtc->active &&
+	plane_state->visible =
 		primary_get_hw_state(to_intel_plane(primary));
 
 	if (plane_state->visible)

drivers/gpu/drm/i915/intel_drv.h

@@ -250,7 +250,6 @@ struct intel_atomic_state {
 	unsigned int cdclk;
 	bool dpll_set;
 	struct intel_shared_dpll_config shared_dpll[I915_NUM_PLLS];
-	struct intel_wm_config wm_config;
 };
 
 struct intel_plane_state {
@@ -335,21 +334,6 @@ struct intel_crtc_scaler_state {
 /* drm_mode->private_flags */
 #define I915_MODE_FLAG_INHERITED 1
 
-struct intel_pipe_wm {
-	struct intel_wm_level wm[5];
-	uint32_t linetime;
-	bool fbc_wm_enabled;
-	bool pipe_enabled;
-	bool sprites_enabled;
-	bool sprites_scaled;
-};
-
-struct skl_pipe_wm {
-	struct skl_wm_level wm[8];
-	struct skl_wm_level trans_wm;
-	uint32_t linetime;
-};
-
 struct intel_crtc_state {
 	struct drm_crtc_state base;
 
@@ -487,17 +471,6 @@ struct intel_crtc_state {
 
 	/* IVB sprite scaling w/a (WaCxSRDisabledForSpriteScaling:ivb) */
 	bool disable_lp_wm;
-
-	struct {
-		/*
-		 * optimal watermarks, programmed post-vblank when this state
-		 * is committed
-		 */
-		union {
-			struct intel_pipe_wm ilk;
-			struct skl_pipe_wm skl;
-		} optimal;
-	} wm;
 };
 
 struct vlv_wm_state {
@@ -509,6 +482,15 @@ struct vlv_wm_state {
 	bool cxsr;
 };
 
+struct intel_pipe_wm {
+	struct intel_wm_level wm[5];
+	uint32_t linetime;
+	bool fbc_wm_enabled;
+	bool pipe_enabled;
+	bool sprites_enabled;
+	bool sprites_scaled;
+};
+
 struct intel_mmio_flip {
 	struct work_struct work;
 	struct drm_i915_private *i915;
@@ -516,6 +498,12 @@ struct intel_mmio_flip {
 	struct intel_crtc *crtc;
 };
 
+struct skl_pipe_wm {
+	struct skl_wm_level wm[8];
+	struct skl_wm_level trans_wm;
+	uint32_t linetime;
+};
+
 /*
  * Tracking of operations that need to be performed at the beginning/end of an
  * atomic commit, outside the atomic section where interrupts are disabled.
@@ -583,10 +571,9 @@ struct intel_crtc {
 	/* per-pipe watermark state */
 	struct {
 		/* watermarks currently being used  */
-		union {
-			struct intel_pipe_wm ilk;
-			struct skl_pipe_wm skl;
-		} active;
+		struct intel_pipe_wm active;
+		/* SKL wm values currently in use */
+		struct skl_pipe_wm skl_active;
 		/* allow CxSR on this pipe */
 		bool cxsr_allowed;
 	} wm;

drivers/gpu/drm/i915/intel_pm.c

@@ -1772,6 +1772,13 @@ struct ilk_wm_maximums {
 	uint16_t fbc;
 };
 
+/* used in computing the new watermarks state */
+struct intel_wm_config {
+	unsigned int num_pipes_active;
+	bool sprites_enabled;
+	bool sprites_scaled;
+};
+
 /*
  * For both WM_PIPE and WM_LP.
  * mem_value must be in 0.1us units.
@@ -2022,11 +2029,9 @@ static void ilk_compute_wm_level(const struct drm_i915_private *dev_priv,
 				 const struct intel_crtc *intel_crtc,
 				 int level,
 				 struct intel_crtc_state *cstate,
-				 struct intel_plane_state *pristate,
-				 struct intel_plane_state *sprstate,
-				 struct intel_plane_state *curstate,
 				 struct intel_wm_level *result)
 {
+	struct intel_plane *intel_plane;
 	uint16_t pri_latency = dev_priv->wm.pri_latency[level];
 	uint16_t spr_latency = dev_priv->wm.spr_latency[level];
 	uint16_t cur_latency = dev_priv->wm.cur_latency[level];
@@ -2038,11 +2043,29 @@ static void ilk_compute_wm_level(const struct drm_i915_private *dev_priv,
 		cur_latency *= 5;
 	}
 
-	result->pri_val = ilk_compute_pri_wm(cstate, pristate,
-					     pri_latency, level);
-	result->spr_val = ilk_compute_spr_wm(cstate, sprstate, spr_latency);
-	result->cur_val = ilk_compute_cur_wm(cstate, curstate, cur_latency);
-	result->fbc_val = ilk_compute_fbc_wm(cstate, pristate, result->pri_val);
+	for_each_intel_plane_on_crtc(dev_priv->dev, intel_crtc, intel_plane) {
+		struct intel_plane_state *pstate =
+			to_intel_plane_state(intel_plane->base.state);
+
+		switch (intel_plane->base.type) {
+		case DRM_PLANE_TYPE_PRIMARY:
+			result->pri_val = ilk_compute_pri_wm(cstate, pstate,
+							     pri_latency,
+							     level);
+			result->fbc_val = ilk_compute_fbc_wm(cstate, pstate,
+							     result->pri_val);
+			break;
+		case DRM_PLANE_TYPE_OVERLAY:
+			result->spr_val = ilk_compute_spr_wm(cstate, pstate,
+							     spr_latency);
+			break;
+		case DRM_PLANE_TYPE_CURSOR:
+			result->cur_val = ilk_compute_cur_wm(cstate, pstate,
+							     cur_latency);
+			break;
+		}
+	}
+
 	result->enable = true;
 }
 
@@ -2301,19 +2324,34 @@ static void skl_setup_wm_latency(struct drm_device *dev)
 	intel_print_wm_latency(dev, "Gen9 Plane", dev_priv->wm.skl_latency);
 }
 
+static void ilk_compute_wm_config(struct drm_device *dev,
+				  struct intel_wm_config *config)
+{
+	struct intel_crtc *intel_crtc;
+
+	/* Compute the currently _active_ config */
+	for_each_intel_crtc(dev, intel_crtc) {
+		const struct intel_pipe_wm *wm = &intel_crtc->wm.active;
+
+		if (!wm->pipe_enabled)
+			continue;
+
+		config->sprites_enabled |= wm->sprites_enabled;
+		config->sprites_scaled |= wm->sprites_scaled;
+		config->num_pipes_active++;
+	}
+}
+
 /* Compute new watermarks for the pipe */
-static int ilk_compute_pipe_wm(struct intel_crtc *intel_crtc,
-			       struct drm_atomic_state *state)
+static bool intel_compute_pipe_wm(struct intel_crtc_state *cstate,
+				  struct intel_pipe_wm *pipe_wm)
 {
-	struct intel_pipe_wm *pipe_wm;
-	struct drm_device *dev = intel_crtc->base.dev;
+	struct drm_crtc *crtc = cstate->base.crtc;
+	struct drm_device *dev = crtc->dev;
 	const struct drm_i915_private *dev_priv = dev->dev_private;
-	struct intel_crtc_state *cstate = NULL;
+	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	struct intel_plane *intel_plane;
-	struct drm_plane_state *ps;
-	struct intel_plane_state *pristate = NULL;
 	struct intel_plane_state *sprstate = NULL;
-	struct intel_plane_state *curstate = NULL;
 	int level, max_level = ilk_wm_max_level(dev);
 	/* LP0 watermark maximums depend on this pipe alone */
 	struct intel_wm_config config = {
@@ -2321,24 +2359,11 @@ static int ilk_compute_pipe_wm(struct intel_crtc *intel_crtc,
 	};
 	struct ilk_wm_maximums max;
 
-	cstate = intel_atomic_get_crtc_state(state, intel_crtc);
-	if (IS_ERR(cstate))
-		return PTR_ERR(cstate);
-
-	pipe_wm = &cstate->wm.optimal.ilk;
-
 	for_each_intel_plane_on_crtc(dev, intel_crtc, intel_plane) {
-		ps = drm_atomic_get_plane_state(state,
-						&intel_plane->base);
-		if (IS_ERR(ps))
-			return PTR_ERR(ps);
-
-		if (intel_plane->base.type == DRM_PLANE_TYPE_PRIMARY)
-			pristate = to_intel_plane_state(ps);
-		else if (intel_plane->base.type == DRM_PLANE_TYPE_OVERLAY)
-			sprstate = to_intel_plane_state(ps);
-		else if (intel_plane->base.type == DRM_PLANE_TYPE_CURSOR)
-			curstate = to_intel_plane_state(ps);
+		if (intel_plane->base.type == DRM_PLANE_TYPE_OVERLAY) {
+			sprstate = to_intel_plane_state(intel_plane->base.state);
+			break;
+		}
 	}
 
 	config.sprites_enabled = sprstate->visible;
@@ -2347,7 +2372,7 @@ static int ilk_compute_pipe_wm(struct intel_crtc *intel_crtc,
 		drm_rect_height(&sprstate->dst) != drm_rect_height(&sprstate->src) >> 16);
 
 	pipe_wm->pipe_enabled = cstate->base.active;
-	pipe_wm->sprites_enabled = config.sprites_enabled;
+	pipe_wm->sprites_enabled = sprstate->visible;
 	pipe_wm->sprites_scaled = config.sprites_scaled;
 
 	/* ILK/SNB: LP2+ watermarks only w/o sprites */
@@ -2358,27 +2383,24 @@ static int ilk_compute_pipe_wm(struct intel_crtc *intel_crtc,
 	if (config.sprites_scaled)
 		max_level = 0;
 
-	ilk_compute_wm_level(dev_priv, intel_crtc, 0, cstate,
-			     pristate, sprstate, curstate, &pipe_wm->wm[0]);
+	ilk_compute_wm_level(dev_priv, intel_crtc, 0, cstate, &pipe_wm->wm[0]);
 
 	if (IS_HASWELL(dev) || IS_BROADWELL(dev))
-		pipe_wm->linetime = hsw_compute_linetime_wm(dev,
-							    &intel_crtc->base);
+		pipe_wm->linetime = hsw_compute_linetime_wm(dev, crtc);
 
 	/* LP0 watermarks always use 1/2 DDB partitioning */
 	ilk_compute_wm_maximums(dev, 0, &config, INTEL_DDB_PART_1_2, &max);
 
 	/* At least LP0 must be valid */
 	if (!ilk_validate_wm_level(0, &max, &pipe_wm->wm[0]))
-		return -EINVAL;
+		return false;
 
 	ilk_compute_wm_reg_maximums(dev, 1, &max);
 
 	for (level = 1; level <= max_level; level++) {
 		struct intel_wm_level wm = {};
 
-		ilk_compute_wm_level(dev_priv, intel_crtc, level, cstate,
-				     pristate, sprstate, curstate, &wm);
+		ilk_compute_wm_level(dev_priv, intel_crtc, level, cstate, &wm);
 
 		/*
 		 * Disable any watermark level that exceeds the
@@ -2391,7 +2413,7 @@ static int ilk_compute_pipe_wm(struct intel_crtc *intel_crtc,
 		pipe_wm->wm[level] = wm;
 	}
 
-	return 0;
+	return true;
 }
 
 /*
@@ -2406,9 +2428,7 @@ static void ilk_merge_wm_level(struct drm_device *dev,
 	ret_wm->enable = true;
 
 	for_each_intel_crtc(dev, intel_crtc) {
-		const struct intel_crtc_state *cstate =
-			to_intel_crtc_state(intel_crtc->base.state);
-		const struct intel_pipe_wm *active = &cstate->wm.optimal.ilk;
+		const struct intel_pipe_wm *active = &intel_crtc->wm.active;
 		const struct intel_wm_level *wm = &active->wm[level];
 
 		if (!active->pipe_enabled)
@@ -2556,15 +2576,14 @@ static void ilk_compute_wm_results(struct drm_device *dev,
 
 	/* LP0 register values */
 	for_each_intel_crtc(dev, intel_crtc) {
-		const struct intel_crtc_state *cstate =
-			to_intel_crtc_state(intel_crtc->base.state);
 		enum pipe pipe = intel_crtc->pipe;
-		const struct intel_wm_level *r = &cstate->wm.optimal.ilk.wm[0];
+		const struct intel_wm_level *r =
+			&intel_crtc->wm.active.wm[0];
 
 		if (WARN_ON(!r->enable))
 			continue;
 
-		results->wm_linetime[pipe] = cstate->wm.optimal.ilk.linetime;
+		results->wm_linetime[pipe] = intel_crtc->wm.active.linetime;
 
 		results->wm_pipe[pipe] =
 			(r->pri_val << WM0_PIPE_PLANE_SHIFT) |
@@ -2946,12 +2965,11 @@ skl_get_total_relative_data_rate(const struct intel_crtc_state *cstate)
 
 static void
 skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
+		      const struct intel_wm_config *config,
 		      struct skl_ddb_allocation *ddb /* out */)
 {
 	struct drm_crtc *crtc = cstate->base.crtc;
 	struct drm_device *dev = crtc->dev;
-	struct drm_i915_private *dev_priv = to_i915(dev);
-	struct intel_wm_config *config = &dev_priv->wm.config;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	struct intel_plane *intel_plane;
 	enum pipe pipe = intel_crtc->pipe;
@@ -3126,6 +3144,15 @@ static bool skl_ddb_allocation_changed(const struct skl_ddb_allocation *new_ddb,
 	return false;
 }
 
+static void skl_compute_wm_global_parameters(struct drm_device *dev,
+					     struct intel_wm_config *config)
+{
+	struct drm_crtc *crtc;
+
+	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
+		config->num_pipes_active += to_intel_crtc(crtc)->active;
+}
+
 static bool skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
 				 struct intel_crtc_state *cstate,
 				 struct intel_plane *intel_plane,
@@ -3530,25 +3557,27 @@ static void skl_flush_wm_values(struct drm_i915_private *dev_priv,
 }
 
 static bool skl_update_pipe_wm(struct drm_crtc *crtc,
+			       struct intel_wm_config *config,
 			       struct skl_ddb_allocation *ddb, /* out */
 			       struct skl_pipe_wm *pipe_wm /* out */)
 {
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	struct intel_crtc_state *cstate = to_intel_crtc_state(crtc->state);
 
-	skl_allocate_pipe_ddb(cstate, ddb);
+	skl_allocate_pipe_ddb(cstate, config, ddb);
 	skl_compute_pipe_wm(cstate, ddb, pipe_wm);
 
-	if (!memcmp(&intel_crtc->wm.active.skl, pipe_wm, sizeof(*pipe_wm)))
+	if (!memcmp(&intel_crtc->wm.skl_active, pipe_wm, sizeof(*pipe_wm)))
 		return false;
 
-	intel_crtc->wm.active.skl = *pipe_wm;
+	intel_crtc->wm.skl_active = *pipe_wm;
 
 	return true;
 }
 
 static void skl_update_other_pipe_wm(struct drm_device *dev,
 				     struct drm_crtc *crtc,
+				     struct intel_wm_config *config,
 				     struct skl_wm_values *r)
 {
 	struct intel_crtc *intel_crtc;
@@ -3578,7 +3607,7 @@ static void skl_update_other_pipe_wm(struct drm_device *dev,
 		if (!intel_crtc->active)
 			continue;
 
-		wm_changed = skl_update_pipe_wm(&intel_crtc->base,
+		wm_changed = skl_update_pipe_wm(&intel_crtc->base, config,
 						&r->ddb, &pipe_wm);
 
 		/*
@@ -3619,8 +3648,8 @@ static void skl_update_wm(struct drm_crtc *crtc)
 	struct drm_device *dev = crtc->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct skl_wm_values *results = &dev_priv->wm.skl_results;
-	struct intel_crtc_state *cstate = to_intel_crtc_state(crtc->state);
-	struct skl_pipe_wm *pipe_wm = &cstate->wm.optimal.skl;
+	struct skl_pipe_wm pipe_wm = {};
+	struct intel_wm_config config = {};
 
 
 	/* Clear all dirty flags */
@@ -3628,13 +3657,15 @@ static void skl_update_wm(struct drm_crtc *crtc)
 
 	skl_clear_wm(results, intel_crtc->pipe);
 
-	if (!skl_update_pipe_wm(crtc, &results->ddb, pipe_wm))
+	skl_compute_wm_global_parameters(dev, &config);
+
+	if (!skl_update_pipe_wm(crtc, &config, &results->ddb, &pipe_wm))
 		return;
 
-	skl_compute_wm_results(dev, pipe_wm, results, intel_crtc);
+	skl_compute_wm_results(dev, &pipe_wm, results, intel_crtc);
 	results->dirty[intel_crtc->pipe] = true;
 
-	skl_update_other_pipe_wm(dev, crtc, results);
+	skl_update_other_pipe_wm(dev, crtc, &config, results);
 	skl_write_wm_values(dev_priv, results);
 	skl_flush_wm_values(dev_priv, results);
 
@@ -3642,23 +3673,50 @@ static void skl_update_wm(struct drm_crtc *crtc)
 	dev_priv->wm.skl_hw = *results;
 }
 
-static void ilk_program_watermarks(struct drm_i915_private *dev_priv)
+static void ilk_update_wm(struct drm_crtc *crtc)
 {
-	struct drm_device *dev = dev_priv->dev;
-	struct intel_pipe_wm lp_wm_1_2 = {}, lp_wm_5_6 = {}, *best_lp_wm;
+	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+	struct intel_crtc_state *cstate = to_intel_crtc_state(crtc->state);
+	struct drm_device *dev = crtc->dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct ilk_wm_maximums max;
-	struct intel_wm_config *config = &dev_priv->wm.config;
 	struct ilk_wm_values results = {};
 	enum intel_ddb_partitioning partitioning;
+	struct intel_pipe_wm pipe_wm = {};
+	struct intel_pipe_wm lp_wm_1_2 = {}, lp_wm_5_6 = {}, *best_lp_wm;
+	struct intel_wm_config config = {};
+
+	WARN_ON(cstate->base.active != intel_crtc->active);
+
+	/*
+	 * IVB workaround: must disable low power watermarks for at least
+	 * one frame before enabling scaling.  LP watermarks can be re-enabled
+	 * when scaling is disabled.
+	 *
+	 * WaCxSRDisabledForSpriteScaling:ivb
+	 */
+	if (cstate->disable_lp_wm) {
+		ilk_disable_lp_wm(dev);
+		intel_wait_for_vblank(dev, intel_crtc->pipe);
+	}
 
-	ilk_compute_wm_maximums(dev, 1, config, INTEL_DDB_PART_1_2, &max);
-	ilk_wm_merge(dev, config, &max, &lp_wm_1_2);
+	intel_compute_pipe_wm(cstate, &pipe_wm);
+
+	if (!memcmp(&intel_crtc->wm.active, &pipe_wm, sizeof(pipe_wm)))
+		return;
+
+	intel_crtc->wm.active = pipe_wm;
+
+	ilk_compute_wm_config(dev, &config);
+
+	ilk_compute_wm_maximums(dev, 1, &config, INTEL_DDB_PART_1_2, &max);
+	ilk_wm_merge(dev, &config, &max, &lp_wm_1_2);
 
 	/* 5/6 split only in single pipe config on IVB+ */
 	if (INTEL_INFO(dev)->gen >= 7 &&
-	    config->num_pipes_active == 1 && config->sprites_enabled) {
-		ilk_compute_wm_maximums(dev, 1, config, INTEL_DDB_PART_5_6, &max);
-		ilk_wm_merge(dev, config, &max, &lp_wm_5_6);
+	    config.num_pipes_active == 1 && config.sprites_enabled) {
+		ilk_compute_wm_maximums(dev, 1, &config, INTEL_DDB_PART_5_6, &max);
+		ilk_wm_merge(dev, &config, &max, &lp_wm_5_6);
 
 		best_lp_wm = ilk_find_best_result(dev, &lp_wm_1_2, &lp_wm_5_6);
 	} else {
@@ -3673,31 +3731,6 @@ static void ilk_program_watermarks(struct drm_i915_private *dev_priv)
 	ilk_write_wm_values(dev_priv, &results);
 }
 
-static void ilk_update_wm(struct drm_crtc *crtc)
-{
-	struct drm_i915_private *dev_priv = to_i915(crtc->dev);
-	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-	struct intel_crtc_state *cstate = to_intel_crtc_state(crtc->state);
-
-	WARN_ON(cstate->base.active != intel_crtc->active);
-
-	/*
-	 * IVB workaround: must disable low power watermarks for at least
-	 * one frame before enabling scaling.  LP watermarks can be re-enabled
-	 * when scaling is disabled.
-	 *
-	 * WaCxSRDisabledForSpriteScaling:ivb
-	 */
-	if (cstate->disable_lp_wm) {
-		ilk_disable_lp_wm(crtc->dev);
-		intel_wait_for_vblank(crtc->dev, intel_crtc->pipe);
-	}
-
-	intel_crtc->wm.active.ilk = cstate->wm.optimal.ilk;
-
-	ilk_program_watermarks(dev_priv);
-}
-
 static void skl_pipe_wm_active_state(uint32_t val,
 				     struct skl_pipe_wm *active,
 				     bool is_transwm,
@@ -3748,8 +3781,7 @@ static void skl_pipe_wm_get_hw_state(struct drm_crtc *crtc)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct skl_wm_values *hw = &dev_priv->wm.skl_hw;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-	struct intel_crtc_state *cstate = to_intel_crtc_state(crtc->state);
-	struct skl_pipe_wm *active = &cstate->wm.optimal.skl;
+	struct skl_pipe_wm *active = &intel_crtc->wm.skl_active;
 	enum pipe pipe = intel_crtc->pipe;
 	int level, i, max_level;
 	uint32_t temp;
@@ -3793,8 +3825,6 @@ static void skl_pipe_wm_get_hw_state(struct drm_crtc *crtc)
 
 	temp = hw->plane_trans[pipe][PLANE_CURSOR];
 	skl_pipe_wm_active_state(temp, active, true, true, i, 0);
-
-	intel_crtc->wm.active.skl = *active;
 }
 
 void skl_wm_get_hw_state(struct drm_device *dev)
@@ -3814,8 +3844,7 @@ static void ilk_pipe_wm_get_hw_state(struct drm_crtc *crtc)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct ilk_wm_values *hw = &dev_priv->wm.hw;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-	struct intel_crtc_state *cstate = to_intel_crtc_state(crtc->state);
-	struct intel_pipe_wm *active = &cstate->wm.optimal.ilk;
+	struct intel_pipe_wm *active = &intel_crtc->wm.active;
 	enum pipe pipe = intel_crtc->pipe;
 	static const unsigned int wm0_pipe_reg[] = {
 		[PIPE_A] = WM0_PIPEA_ILK,
@@ -3854,8 +3883,6 @@ static void ilk_pipe_wm_get_hw_state(struct drm_crtc *crtc)
 		for (level = 0; level <= max_level; level++)
 			active->wm[level].enable = true;
 	}
-
-	intel_crtc->wm.active.ilk = *active;
 }
 
 #define _FW_WM(value, plane) \
@@ -7003,7 +7030,6 @@ void intel_init_pm(struct drm_device *dev)
 		    (!IS_GEN5(dev) && dev_priv->wm.pri_latency[0] &&
 		     dev_priv->wm.spr_latency[0] && dev_priv->wm.cur_latency[0])) {
 			dev_priv->display.update_wm = ilk_update_wm;
-			dev_priv->display.compute_pipe_wm = ilk_compute_pipe_wm;
 		} else {
 			DRM_DEBUG_KMS("Failed to read display plane latency. "
 				      "Disable CxSR\n");