[PATCH v2 04/12] drm/i915: Add dev_priv->wm.num_levels and use it everywhere

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From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>

Unify our approach to figuring out how many wm levels are supported by
having dev_priv->wm.num_levels. This replaces the older
dev_priv->wm.max_level which was used on some of the platforms. I think
num_levels is less confusing than max_level in most places. The +/-1 is
now mostly isolated to the mempry latency init code.

v2: Rebase

Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/i915/i915_debugfs.c  |  24 +----
 drivers/gpu/drm/i915/i915_drv.h      |   4 +-
 drivers/gpu/drm/i915/intel_display.c |   6 +-
 drivers/gpu/drm/i915/intel_pm.c      | 131 +++++++++++++--------------
 4 files changed, 69 insertions(+), 96 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 8fd783aa226e..d3250c674eb8 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -3789,17 +3789,7 @@ static void wm_latency_show(struct seq_file *m, const uint16_t wm[8])
 {
 	struct drm_i915_private *dev_priv = m->private;
 	struct drm_device *dev = &dev_priv->drm;
-	int level;
-	int num_levels;
-
-	if (IS_CHERRYVIEW(dev_priv))
-		num_levels = 3;
-	else if (IS_VALLEYVIEW(dev_priv))
-		num_levels = 1;
-	else if (IS_G4X(dev_priv))
-		num_levels = 3;
-	else
-		num_levels = ilk_wm_max_level(dev_priv) + 1;
+	int level, num_levels = dev_priv->wm.num_levels;
 
 	drm_modeset_lock_all(dev);
 
@@ -3880,20 +3870,10 @@ static ssize_t wm_latency_write(struct file *file, const char __user *ubuf,
 	struct drm_i915_private *dev_priv = m->private;
 	struct drm_device *dev = &dev_priv->drm;
 	uint16_t new[8] = { 0 };
-	int num_levels;
-	int level;
+	int level, num_levels = dev_priv->wm.num_levels;
 	int ret;
 	char tmp[32];
 
-	if (IS_CHERRYVIEW(dev_priv))
-		num_levels = 3;
-	else if (IS_VALLEYVIEW(dev_priv))
-		num_levels = 1;
-	else if (IS_G4X(dev_priv))
-		num_levels = 3;
-	else
-		num_levels = ilk_wm_max_level(dev_priv) + 1;
-
 	if (len >= sizeof(tmp))
 		return -EINVAL;
 
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 406f4123eab6..e6d6ec2e0e71 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1902,8 +1902,6 @@ struct drm_i915_private {
 			struct g4x_wm_values g4x;
 		};
 
-		uint8_t max_level;
-
 		/*
 		 * Should be held around atomic WM register writing; also
 		 * protects * intel_crtc->wm.active and
@@ -1911,6 +1909,8 @@ struct drm_i915_private {
 		 */
 		struct mutex wm_mutex;
 
+		u8 num_levels;
+
 		/*
 		 * Set during HW readout of watermarks/DDB.  Some platforms
 		 * need to know when we're still using BIOS-provided values
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index fe045abb6472..f4dd297d4804 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11802,7 +11802,7 @@ static void verify_wm_state(struct drm_crtc *crtc,
 	struct skl_ddb_entry *hw_ddb_entry, *sw_ddb_entry;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	const enum pipe pipe = intel_crtc->pipe;
-	int plane, level, max_level = ilk_wm_max_level(dev_priv);
+	int plane, level, num_levels = dev_priv->wm.num_levels;
 
 	if (INTEL_GEN(dev_priv) < 9 || !new_state->active)
 		return;
@@ -11824,7 +11824,7 @@ static void verify_wm_state(struct drm_crtc *crtc,
 		sw_plane_wm = &sw_wm->planes[plane];
 
 		/* Watermarks */
-		for (level = 0; level <= max_level; level++) {
+		for (level = 0; level < num_levels; level++) {
 			if (skl_wm_level_equals(&hw_plane_wm->wm[level],
 						&sw_plane_wm->wm[level]))
 				continue;
@@ -11874,7 +11874,7 @@ static void verify_wm_state(struct drm_crtc *crtc,
 		sw_plane_wm = &sw_wm->planes[PLANE_CURSOR];
 
 		/* Watermarks */
-		for (level = 0; level <= max_level; level++) {
+		for (level = 0; level < num_levels; level++) {
 			if (skl_wm_level_equals(&hw_plane_wm->wm[level],
 						&sw_plane_wm->wm[level]))
 				continue;
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 22cbb8e25f5b..4ffaa17fc4e0 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -796,23 +796,18 @@ static bool is_enabling(int old, int new, int threshold)
 	return old < threshold && new >= threshold;
 }
 
-static int intel_wm_num_levels(struct drm_i915_private *dev_priv)
-{
-	return dev_priv->wm.max_level + 1;
-}
-
 static void intel_print_wm_latency(struct drm_i915_private *dev_priv,
 				   const char *name,
 				   const uint16_t wm[8])
 {
-	int level, max_level = ilk_wm_max_level(dev_priv);
+	int level, num_levels = dev_priv->wm.num_levels;
 
-	for (level = 0; level <= max_level; level++) {
+	for (level = 0; level < num_levels; level++) {
 		unsigned int latency = wm[level];
 
 		if (latency == 0) {
-			DRM_DEBUG_KMS("%s WM%d latency not provided\n",
-				      name, level);
+			DRM_ERROR("%s WM%d latency not provided\n",
+				  name, level);
 			continue;
 		}
 
@@ -1080,7 +1075,7 @@ static void g4x_setup_wm_latency(struct drm_i915_private *dev_priv)
 	dev_priv->wm.pri_latency[G4X_WM_LEVEL_SR] = 12 * 10;
 	dev_priv->wm.pri_latency[G4X_WM_LEVEL_HPLL] = 35 * 10;
 
-	dev_priv->wm.max_level = G4X_WM_LEVEL_HPLL;
+	dev_priv->wm.num_levels = G4X_WM_LEVEL_HPLL + 1;
 
 	memcpy(dev_priv->wm.spr_latency, dev_priv->wm.pri_latency,
 	       sizeof(dev_priv->wm.pri_latency));
@@ -1204,7 +1199,7 @@ static bool g4x_raw_plane_wm_set(struct intel_crtc_state *crtc_state,
 	struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
 	bool dirty = false;
 
-	for (; level < intel_wm_num_levels(dev_priv); level++) {
+	for (; level < dev_priv->wm.num_levels; level++) {
 		struct g4x_pipe_wm *raw = &crtc_state->wm.g4x.raw[level];
 
 		dirty |= raw->plane[plane_id] != value;
@@ -1223,7 +1218,7 @@ static bool g4x_raw_fbc_wm_set(struct intel_crtc_state *crtc_state,
 	/* NORMAL level doesn't have an FBC watermark */
 	level = max(level, G4X_WM_LEVEL_SR);
 
-	for (; level < intel_wm_num_levels(dev_priv); level++) {
+	for (; level < dev_priv->wm.num_levels; level++) {
 		struct g4x_pipe_wm *raw = &crtc_state->wm.g4x.raw[level];
 
 		dirty |= raw->fbc != value;
@@ -1241,7 +1236,8 @@ static bool g4x_raw_plane_wm_compute(struct intel_crtc_state *crtc_state,
 				     const struct intel_plane_state *plane_state)
 {
 	struct intel_plane *plane = to_intel_plane(plane_state->base.plane);
-	int num_levels = intel_wm_num_levels(to_i915(plane->base.dev));
+	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
+	int num_levels = dev_priv->wm.num_levels;
 	enum plane_id plane_id = plane->id;
 	bool dirty = false;
 	int level;
@@ -1321,7 +1317,7 @@ static bool g4x_raw_crtc_wm_is_valid(const struct intel_crtc_state *crtc_state,
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
 
-	if (level > dev_priv->wm.max_level)
+	if (level >= dev_priv->wm.num_levels)
 		return false;
 
 	return g4x_raw_plane_wm_is_valid(crtc_state, PLANE_PRIMARY, level) &&
@@ -1634,13 +1630,13 @@ static void vlv_setup_wm_latency(struct drm_i915_private *dev_priv)
 	/* all latencies in .1 usec */
 	dev_priv->wm.pri_latency[VLV_WM_LEVEL_PM2] = 3 * 10;
 
-	dev_priv->wm.max_level = VLV_WM_LEVEL_PM2;
+	dev_priv->wm.num_levels = VLV_WM_LEVEL_PM2 + 1;
 
 	if (IS_CHERRYVIEW(dev_priv)) {
 		dev_priv->wm.pri_latency[VLV_WM_LEVEL_PM5] = 12 * 10;
 		dev_priv->wm.pri_latency[VLV_WM_LEVEL_DDR_DVFS] = 33 * 10;
 
-		dev_priv->wm.max_level = VLV_WM_LEVEL_DDR_DVFS;
+		dev_priv->wm.num_levels = VLV_WM_LEVEL_DDR_DVFS + 1;
 	}
 
 	memcpy(dev_priv->wm.spr_latency, dev_priv->wm.pri_latency,
@@ -1783,7 +1779,7 @@ static void vlv_invalidate_wms(struct intel_crtc *crtc,
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
 
-	for (; level < intel_wm_num_levels(dev_priv); level++) {
+	for (; level < dev_priv->wm.num_levels; level++) {
 		enum plane_id plane_id;
 
 		for_each_plane_id_on_crtc(crtc, plane_id)
@@ -1810,7 +1806,7 @@ static bool vlv_raw_plane_wm_set(struct intel_crtc_state *crtc_state,
 				 int level, enum plane_id plane_id, u16 value)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
-	int num_levels = intel_wm_num_levels(dev_priv);
+	int num_levels = dev_priv->wm.num_levels;
 	bool dirty = false;
 
 	for (; level < num_levels; level++) {
@@ -1827,8 +1823,9 @@ static bool vlv_raw_plane_wm_compute(struct intel_crtc_state *crtc_state,
 				     const struct intel_plane_state *plane_state)
 {
 	struct intel_plane *plane = to_intel_plane(plane_state->base.plane);
+	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
 	enum plane_id plane_id = plane->id;
-	int num_levels = intel_wm_num_levels(to_i915(plane->base.dev));
+	int num_levels = dev_priv->wm.num_levels;
 	int level;
 	bool dirty = false;
 
@@ -1942,7 +1939,7 @@ static int vlv_compute_pipe_wm(struct intel_crtc_state *crtc_state)
 	}
 
 	/* initially allow all levels */
-	wm_state->num_levels = intel_wm_num_levels(dev_priv);
+	wm_state->num_levels = dev_priv->wm.num_levels;
 	/*
 	 * Note that enabling cxsr with no primary/sprite planes
 	 * enabled can wedge the pipe. Hence we only allow cxsr
@@ -2143,7 +2140,7 @@ static void vlv_merge_wm(struct drm_i915_private *dev_priv,
 	struct intel_crtc *crtc;
 	int num_active_crtcs = 0;
 
-	wm->level = dev_priv->wm.max_level;
+	wm->level = dev_priv->wm.num_levels - 1;
 	wm->cxsr = true;
 
 	for_each_intel_crtc(&dev_priv->drm, crtc) {
@@ -2663,7 +2660,7 @@ static unsigned int ilk_fbc_wm_reg_max(const struct drm_i915_private *dev_priv)
 }
 
 /* Calculate the maximum primary/sprite plane watermark */
-static unsigned int ilk_plane_wm_max(const struct drm_device *dev,
+static unsigned int ilk_plane_wm_max(struct drm_device *dev,
 				     int level,
 				     const struct intel_wm_config *config,
 				     enum intel_ddb_partitioning ddb_partitioning,
@@ -2705,7 +2702,7 @@ static unsigned int ilk_plane_wm_max(const struct drm_device *dev,
 }
 
 /* Calculate the maximum cursor plane watermark */
-static unsigned int ilk_cursor_wm_max(const struct drm_device *dev,
+static unsigned int ilk_cursor_wm_max(struct drm_device *dev,
 				      int level,
 				      const struct intel_wm_config *config)
 {
@@ -2717,7 +2714,7 @@ static unsigned int ilk_cursor_wm_max(const struct drm_device *dev,
 	return ilk_cursor_wm_reg_max(to_i915(dev), level);
 }
 
-static void ilk_compute_wm_maximums(const struct drm_device *dev,
+static void ilk_compute_wm_maximums(struct drm_device *dev,
 				    int level,
 				    const struct intel_wm_config *config,
 				    enum intel_ddb_partitioning ddb_partitioning,
@@ -2837,7 +2834,7 @@ static void intel_read_wm_latency(struct drm_i915_private *dev_priv,
 	if (INTEL_GEN(dev_priv) >= 9) {
 		uint32_t val;
 		int ret, i;
-		int level, max_level = ilk_wm_max_level(dev_priv);
+		int level, num_levels = dev_priv->wm.num_levels;
 
 		/* read the first set of memory latencies[0:3] */
 		val = 0; /* data0 to be programmed to 0 for first set */
@@ -2885,9 +2882,9 @@ static void intel_read_wm_latency(struct drm_i915_private *dev_priv,
 		 * need to be disabled. We make sure to sanitize the values out
 		 * of the punit to satisfy this requirement.
 		 */
-		for (level = 1; level <= max_level; level++) {
+		for (level = 1; level < num_levels; level++) {
 			if (wm[level] == 0) {
-				for (i = level + 1; i <= max_level; i++)
+				for (i = level + 1; i < num_levels; i++)
 					wm[i] = 0;
 				break;
 			}
@@ -2902,7 +2899,7 @@ static void intel_read_wm_latency(struct drm_i915_private *dev_priv,
 		 */
 		if (wm[0] == 0) {
 			wm[0] += 2;
-			for (level = 1; level <= max_level; level++) {
+			for (level = 1; level < num_levels; level++) {
 				if (wm[level] == 0)
 					break;
 				wm[level] += 2;
@@ -2966,30 +2963,17 @@ static void intel_fixup_cur_wm_latency(struct drm_i915_private *dev_priv,
 static void ilk_fixup_wm_latency_units(struct drm_i915_private *dev_priv,
 				       u16 wm[5])
 {
-	int level, num_levels = ilk_wm_max_level(dev_priv) + 1;
+	int level, num_levels = dev_priv->wm.num_levels;
 
 	/* convert .5 usec to .1 usec units */
 	for (level = 1; level < num_levels; level++)
 		wm[level] *= 5;
 }
 
-int ilk_wm_max_level(const struct drm_i915_private *dev_priv)
-{
-	/* how many WM levels are we expecting */
-	if (INTEL_GEN(dev_priv) >= 9)
-		return 7;
-	else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
-		return 4;
-	else if (INTEL_GEN(dev_priv) >= 6)
-		return 3;
-	else
-		return 2;
-}
-
 static bool ilk_increase_wm_latency(struct drm_i915_private *dev_priv,
 				    u16 wm[5], u16 min)
 {
-	int level, max_level = ilk_wm_max_level(dev_priv);
+	int level, num_levels = dev_priv->wm.num_levels;
 
 	if (wm[0] >= min)
 		return false;
@@ -2998,7 +2982,7 @@ static bool ilk_increase_wm_latency(struct drm_i915_private *dev_priv,
 
 	/* WM1+ latencies must be multiples of .5 usec */
 	min = roundup(min, 5);
-	for (level = 1; level <= max_level; level++)
+	for (level = 1; level < num_levels; level++)
 		wm[level] = max(wm[level], min);
 
 	return true;
@@ -3027,6 +3011,13 @@ static void snb_wm_latency_quirk(struct drm_i915_private *dev_priv)
 
 static void ilk_setup_wm_latency(struct drm_i915_private *dev_priv)
 {
+	if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
+		dev_priv->wm.num_levels = 5;
+	else if (INTEL_GEN(dev_priv) >= 6)
+		dev_priv->wm.num_levels = 4;
+	else
+		dev_priv->wm.num_levels = 3;
+
 	intel_read_wm_latency(dev_priv, dev_priv->wm.pri_latency);
 
 	ilk_fixup_wm_latency_units(dev_priv, dev_priv->wm.pri_latency);
@@ -3050,7 +3041,7 @@ static void ilk_setup_wm_latency(struct drm_i915_private *dev_priv)
 static void skl_fixup_wm_latency_units(struct drm_i915_private *dev_priv,
 				       u16 wm[8])
 {
-	int level, num_levels = ilk_wm_max_level(dev_priv) + 1;
+	int level, num_levels = dev_priv->wm.num_levels;
 
 	/* convert usec to .1 usec units */
 	for (level = 0; level < num_levels; level++)
@@ -3059,6 +3050,8 @@ static void skl_fixup_wm_latency_units(struct drm_i915_private *dev_priv,
 
 static void skl_setup_wm_latency(struct drm_i915_private *dev_priv)
 {
+	dev_priv->wm.num_levels = 8;
+
 	intel_read_wm_latency(dev_priv, dev_priv->wm.pri_latency);
 
 	skl_fixup_wm_latency_units(dev_priv, dev_priv->wm.pri_latency);
@@ -3109,7 +3102,7 @@ static int ilk_compute_pipe_wm(struct intel_crtc_state *cstate)
 	const struct intel_plane_state *pristate = NULL;
 	const struct intel_plane_state *sprstate = NULL;
 	const struct intel_plane_state *curstate = NULL;
-	int level, max_level = ilk_wm_max_level(dev_priv), usable_level;
+	int level, num_levels = dev_priv->wm.num_levels, usable_level;
 	struct ilk_wm_maximums max;
 
 	pipe_wm = &cstate->wm.ilk.optimal;
@@ -3133,7 +3126,7 @@ static int ilk_compute_pipe_wm(struct intel_crtc_state *cstate)
 			 drm_rect_height(&sprstate->base.dst) != drm_rect_height(&sprstate->base.src) >> 16);
 	}
 
-	usable_level = max_level;
+	usable_level = num_levels - 1;
 
 	/* ILK/SNB: LP2+ watermarks only w/o sprites */
 	if (INTEL_GEN(dev_priv) <= 6 && pipe_wm->sprites_enabled)
@@ -3184,13 +3177,14 @@ static int ilk_compute_intermediate_wm(struct drm_device *dev,
 				       struct intel_crtc *intel_crtc,
 				       struct intel_crtc_state *newstate)
 {
+	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct intel_pipe_wm *a = &newstate->wm.ilk.intermediate;
 	struct intel_atomic_state *intel_state =
 		to_intel_atomic_state(newstate->base.state);
 	const struct intel_crtc_state *oldstate =
 		intel_atomic_get_old_crtc_state(intel_state, intel_crtc);
 	const struct intel_pipe_wm *b = &oldstate->wm.ilk.optimal;
-	int level, max_level = ilk_wm_max_level(to_i915(dev));
+	int level, num_levels = dev_priv->wm.num_levels;
 
 	/*
 	 * Start with the final, target watermarks, then combine with the
@@ -3205,7 +3199,7 @@ static int ilk_compute_intermediate_wm(struct drm_device *dev,
 	a->sprites_enabled |= b->sprites_enabled;
 	a->sprites_scaled |= b->sprites_scaled;
 
-	for (level = 0; level <= max_level; level++) {
+	for (level = 0; level < num_levels; level++) {
 		struct intel_wm_level *a_wm = &a->wm[level];
 		const struct intel_wm_level *b_wm = &b->wm[level];
 
@@ -3277,8 +3271,8 @@ static void ilk_wm_merge(struct drm_device *dev,
 			 struct intel_pipe_wm *merged)
 {
 	struct drm_i915_private *dev_priv = to_i915(dev);
-	int level, max_level = ilk_wm_max_level(dev_priv);
-	int last_enabled_level = max_level;
+	int level, num_levels = dev_priv->wm.num_levels;
+	int last_enabled_level = num_levels - 1;
 
 	/* ILK/SNB/IVB: LP1+ watermarks only w/ single pipe */
 	if ((INTEL_GEN(dev_priv) <= 6 || IS_IVYBRIDGE(dev_priv)) &&
@@ -3289,7 +3283,7 @@ static void ilk_wm_merge(struct drm_device *dev,
 	merged->fbc_wm_enabled = INTEL_GEN(dev_priv) >= 6;
 
 	/* merge each WM1+ level */
-	for (level = 1; level <= max_level; level++) {
+	for (level = 1; level < num_levels; level++) {
 		struct intel_wm_level *wm = &merged->wm[level];
 
 		ilk_merge_wm_level(dev, level, wm);
@@ -3319,7 +3313,7 @@ static void ilk_wm_merge(struct drm_device *dev,
 	 */
 	if (IS_GEN5(dev_priv) && !merged->fbc_wm_enabled &&
 	    intel_fbc_is_active(dev_priv)) {
-		for (level = 2; level <= max_level; level++) {
+		for (level = 2; level < num_levels; level++) {
 			struct intel_wm_level *wm = &merged->wm[level];
 
 			wm->enable = false;
@@ -3419,10 +3413,11 @@ static struct intel_pipe_wm *ilk_find_best_result(struct drm_device *dev,
 						  struct intel_pipe_wm *r1,
 						  struct intel_pipe_wm *r2)
 {
-	int level, max_level = ilk_wm_max_level(to_i915(dev));
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	int level, num_levels = dev_priv->wm.num_levels;
 	int level1 = 0, level2 = 0;
 
-	for (level = 1; level <= max_level; level++) {
+	for (level = 1; level < num_levels; level++) {
 		if (r1->wm[level].enable)
 			level1 = level;
 		if (r2->wm[level].enable)
@@ -3798,7 +3793,7 @@ bool intel_can_enable_sagv(struct drm_atomic_state *state)
 			continue;
 
 		/* Find the highest enabled wm level for this plane */
-		for (level = ilk_wm_max_level(dev_priv);
+		for (level = dev_priv->wm.num_levels - 1;
 		     !wm->wm[level].plane_en; --level)
 		     { }
 
@@ -4900,14 +4895,14 @@ skl_compute_wm_levels(const struct drm_i915_private *dev_priv,
 		      struct skl_plane_wm *wm,
 		      struct skl_wm_level *levels)
 {
-	int level, max_level = ilk_wm_max_level(dev_priv);
+	int level, num_levels = dev_priv->wm.num_levels;
 	struct skl_wm_level *result_prev = &levels[0];
 	int ret;
 
 	if (WARN_ON(!intel_pstate->base.fb))
 		return -EINVAL;
 
-	for (level = 0; level <= max_level; level++) {
+	for (level = 0; level < num_levels; level++) {
 		struct skl_wm_level *result = &levels[level];
 
 		ret = skl_compute_plane_wm(dev_priv,
@@ -5181,10 +5176,10 @@ static void skl_write_plane_wm(struct intel_crtc *intel_crtc,
 	struct drm_crtc *crtc = &intel_crtc->base;
 	struct drm_device *dev = crtc->dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
-	int level, max_level = ilk_wm_max_level(dev_priv);
+	int level, num_levels = dev_priv->wm.num_levels;
 	enum pipe pipe = intel_crtc->pipe;
 
-	for (level = 0; level <= max_level; level++) {
+	for (level = 0; level < num_levels; level++) {
 		skl_write_wm_level(dev_priv, PLANE_WM(pipe, plane_id, level),
 				   &wm->wm[level]);
 	}
@@ -5212,10 +5207,10 @@ static void skl_write_cursor_wm(struct intel_crtc *intel_crtc,
 	struct drm_crtc *crtc = &intel_crtc->base;
 	struct drm_device *dev = crtc->dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
-	int level, max_level = ilk_wm_max_level(dev_priv);
+	int level, num_levels = dev_priv->wm.num_levels;
 	enum pipe pipe = intel_crtc->pipe;
 
-	for (level = 0; level <= max_level; level++) {
+	for (level = 0; level < num_levels; level++) {
 		skl_write_wm_level(dev_priv, CUR_WM(pipe, level),
 				   &wm->wm[level]);
 	}
@@ -5691,16 +5686,14 @@ void skl_pipe_wm_get_hw_state(struct drm_crtc *crtc,
 	struct drm_i915_private *dev_priv = to_i915(crtc->dev);
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	enum pipe pipe = intel_crtc->pipe;
-	int level, max_level;
+	int level, num_levels = dev_priv->wm.num_levels;
 	enum plane_id plane_id;
 	uint32_t val;
 
-	max_level = ilk_wm_max_level(dev_priv);
-
 	for_each_plane_id_on_crtc(intel_crtc, plane_id) {
 		struct skl_plane_wm *wm = &out->planes[plane_id];
 
-		for (level = 0; level <= max_level; level++) {
+		for (level = 0; level < num_levels; level++) {
 			if (plane_id != PLANE_CURSOR)
 				val = I915_READ(PLANE_WM(pipe, plane_id, level));
 			else
@@ -5794,14 +5787,14 @@ static void ilk_pipe_wm_get_hw_state(struct drm_crtc *crtc)
 		active->wm[0].cur_val = tmp & WM0_PIPE_CURSOR_MASK;
 		active->linetime = hw->wm_linetime[pipe];
 	} else {
-		int level, max_level = ilk_wm_max_level(dev_priv);
+		int level, num_levels = dev_priv->wm.num_levels;
 
 		/*
 		 * For inactive pipes, all watermark levels
 		 * should be marked as enabled but zeroed,
 		 * which is what we'd compute them to.
 		 */
-		for (level = 0; level <= max_level; level++)
+		for (level = 0; level < num_levels; level++)
 			active->wm[level].enable = true;
 	}
 
@@ -6092,7 +6085,7 @@ void vlv_wm_get_hw_state(struct drm_device *dev)
 			      FORCE_DDR_FREQ_REQ_ACK) == 0, 3)) {
 			DRM_DEBUG_KMS("Punit not acking DDR DVFS request, "
 				      "assuming DDR DVFS is disabled\n");
-			dev_priv->wm.max_level = VLV_WM_LEVEL_PM5;
+			dev_priv->wm.num_levels = VLV_WM_LEVEL_PM5 + 1;
 		} else {
 			val = vlv_punit_read(dev_priv, PUNIT_REG_DDR_SETUP2);
 			if ((val & FORCE_DDR_HIGH_FREQ) == 0)
-- 
2.18.1

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