drm/i915: Convert cdclk to global state

Let's convert cdclk_state to be a proper global state. That allows
us to use the regular atomic old vs. new state accessor, hopefully
making the code less confusing.

We do have to deal with a few more error cases in case the cdclk
state duplication fails. But so be it.

v2: Fix new plane min_cdclk vs. old crtc min_cdclk check
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200121140353.25997-1-ville.syrjala@linux.intel.comReviewed-by: Imre Deak <imre.deak@intel.com>

drivers/gpu/drm/i915/display/intel_atomic.c

@@ -520,7 +520,6 @@ void intel_atomic_state_clear(struct drm_atomic_state *s)
 	state->dpll_set = state->modeset = false;
 	state->global_state_changed = false;
 	state->active_pipes = 0;
-	intel_cdclk_clear_state(state);
 }
 
 struct intel_crtc_state *

drivers/gpu/drm/i915/display/intel_atomic_plane.c

@@ -37,6 +37,7 @@
 
 #include "i915_trace.h"
 #include "intel_atomic_plane.h"
+#include "intel_cdclk.h"
 #include "intel_display_types.h"
 #include "intel_pm.h"
 #include "intel_sprite.h"
@@ -155,45 +156,63 @@ unsigned int intel_plane_data_rate(const struct intel_crtc_state *crtc_state,
 	return cpp * crtc_state->pixel_rate;
 }
 
-bool intel_plane_calc_min_cdclk(struct intel_atomic_state *state,
-				struct intel_plane *plane)
+int intel_plane_calc_min_cdclk(struct intel_atomic_state *state,
+			       struct intel_plane *plane,
+			       bool *need_cdclk_calc)
 {
 	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
-	const struct intel_cdclk_state *cdclk_state =
-		&dev_priv->cdclk_state;
 	const struct intel_plane_state *plane_state =
 		intel_atomic_get_new_plane_state(state, plane);
 	struct intel_crtc *crtc = to_intel_crtc(plane_state->hw.crtc);
-	struct intel_crtc_state *crtc_state;
+	const struct intel_cdclk_state *cdclk_state;
+	struct intel_crtc_state *new_crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+	const struct intel_crtc_state *old_crtc_state =
+		intel_atomic_get_old_crtc_state(state, crtc);
 
 	if (!plane_state->uapi.visible || !plane->min_cdclk)
-		return false;
+		return 0;
+
+	new_crtc_state->min_cdclk[plane->id] =
+		plane->min_cdclk(new_crtc_state, plane_state);
 
-	crtc_state = intel_atomic_get_new_crtc_state(state, crtc);
+	/*
+	 * No need to check against the cdclk state if
+	 * the min cdclk for the plane doesn't increase.
+	 *
+	 * Ie. we only ever increase the cdclk due to plane
+	 * requirements. This can reduce back and forth
+	 * display blinking due to constant cdclk changes.
+	 */
+	if (new_crtc_state->min_cdclk[plane->id] <=
+	    old_crtc_state->min_cdclk[plane->id])
+		return 0;
 
-	crtc_state->min_cdclk[plane->id] =
-		plane->min_cdclk(crtc_state, plane_state);
+	cdclk_state = intel_atomic_get_cdclk_state(state);
+	if (IS_ERR(cdclk_state))
+		return PTR_ERR(cdclk_state);
 
 	/*
-	 * Does the cdclk need to be bumbed up?
+	 * No need to recalculate the cdclk state if
+	 * the min cdclk for the pipe doesn't increase.
 	 *
-	 * Note: we obviously need to be called before the new
-	 * cdclk frequency is calculated so state->cdclk.logical
-	 * hasn't been populated yet. Hence we look at the old
-	 * cdclk state under dev_priv->cdclk.logical. This is
-	 * safe as long we hold at least one crtc mutex (which
-	 * must be true since we have crtc_state).
+	 * Ie. we only ever increase the cdclk due to plane
+	 * requirements. This can reduce back and forth
+	 * display blinking due to constant cdclk changes.
 	 */
-	if (crtc_state->min_cdclk[plane->id] > cdclk_state->logical.cdclk) {
-		drm_dbg_kms(&dev_priv->drm,
-			    "[PLANE:%d:%s] min_cdclk (%d kHz) > logical cdclk (%d kHz)\n",
-			    plane->base.base.id, plane->base.name,
-			    crtc_state->min_cdclk[plane->id],
-			    cdclk_state->logical.cdclk);
-		return true;
-	}
+	if (new_crtc_state->min_cdclk[plane->id] <=
+	    cdclk_state->min_cdclk[crtc->pipe])
+		return 0;
+
+	drm_dbg_kms(&dev_priv->drm,
+		    "[PLANE:%d:%s] min cdclk (%d kHz) > [CRTC:%d:%s] min cdclk (%d kHz)\n",
+		    plane->base.base.id, plane->base.name,
+		    new_crtc_state->min_cdclk[plane->id],
+		    crtc->base.base.id, crtc->base.name,
+		    cdclk_state->min_cdclk[crtc->pipe]);
+	*need_cdclk_calc = true;
 
-	return false;
+	return 0;
 }
 
 static void intel_plane_clear_hw_state(struct intel_plane_state *plane_state)

drivers/gpu/drm/i915/display/intel_atomic_plane.h

@@ -46,7 +46,8 @@ int intel_plane_atomic_calc_changes(const struct intel_crtc_state *old_crtc_stat
 				    struct intel_crtc_state *crtc_state,
 				    const struct intel_plane_state *old_plane_state,
 				    struct intel_plane_state *plane_state);
-bool intel_plane_calc_min_cdclk(struct intel_atomic_state *state,
-				struct intel_plane *plane);
+int intel_plane_calc_min_cdclk(struct intel_atomic_state *state,
+			       struct intel_plane *plane,
+			       bool *need_cdclk_calc);
 
 #endif /* __INTEL_ATOMIC_PLANE_H__ */

drivers/gpu/drm/i915/display/intel_audio.c

@@ -30,6 +30,7 @@
 #include "i915_drv.h"
 #include "intel_atomic.h"
 #include "intel_audio.h"
+#include "intel_cdclk.h"
 #include "intel_display_types.h"
 #include "intel_lpe_audio.h"
 
@@ -809,6 +810,34 @@ void intel_init_audio_hooks(struct drm_i915_private *dev_priv)
 	}
 }
 
+static int glk_force_audio_cdclk_commit(struct intel_atomic_state *state,
+					bool enable)
+{
+	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
+	struct intel_cdclk_state *cdclk_state;
+	struct intel_crtc *crtc;
+	int ret;
+
+	/* need to hold at least one crtc lock for the global state */
+	crtc = intel_get_crtc_for_pipe(dev_priv, PIPE_A);
+	ret = drm_modeset_lock(&crtc->base.mutex, state->base.acquire_ctx);
+	if (ret)
+		return ret;
+
+	cdclk_state = intel_atomic_get_cdclk_state(state);
+	if (IS_ERR(cdclk_state))
+		return PTR_ERR(cdclk_state);
+
+	cdclk_state->force_min_cdclk_changed = true;
+	cdclk_state->force_min_cdclk = enable ? 2 * 96000 : 0;
+
+	ret = intel_atomic_lock_global_state(&cdclk_state->base);
+	if (ret)
+		return ret;
+
+	return drm_atomic_commit(&state->base);
+}
+
 static void glk_force_audio_cdclk(struct drm_i915_private *dev_priv,
 				  bool enable)
 {
@@ -824,15 +853,7 @@ static void glk_force_audio_cdclk(struct drm_i915_private *dev_priv,
 	state->acquire_ctx = &ctx;
 
 retry:
-	to_intel_atomic_state(state)->cdclk_state.force_min_cdclk_changed = true;
-	to_intel_atomic_state(state)->cdclk_state.force_min_cdclk =
-		enable ? 2 * 96000 : 0;
-
-	/* Protects dev_priv->cdclk.force_min_cdclk */
-	ret = _intel_atomic_lock_global_state(to_intel_atomic_state(state));
-	if (!ret)
-		ret = drm_atomic_commit(state);
-
+	ret = glk_force_audio_cdclk_commit(to_intel_atomic_state(state), enable);
 	if (ret == -EDEADLK) {
 		drm_atomic_state_clear(state);
 		drm_modeset_backoff(&ctx);

drivers/gpu/drm/i915/display/intel_cdclk.c

@@ -1823,37 +1823,6 @@ static bool intel_cdclk_changed(const struct intel_cdclk_config *a,
 		a->voltage_level != b->voltage_level;
 }
 
-/**
- * intel_cdclk_clear_state - clear the cdclk state
- * @state: atomic state
- *
- * Clear the cdclk state for ww_mutex backoff.
- */
-void intel_cdclk_clear_state(struct intel_atomic_state *state)
-{
-	memset(&state->cdclk_state, 0, sizeof(state->cdclk_state));
-	state->cdclk_state.pipe = INVALID_PIPE;
-}
-
-/**
- * intel_cdclk_swap_state - make atomic CDCLK configuration effective
- * @state: atomic state
- *
- * This is the CDCLK version of drm_atomic_helper_swap_state() since the
- * helper does not handle driver-specific global state.
- *
- * Similarly to the atomic helpers this function does a complete swap,
- * i.e. it also puts the old state into @state. This is used by the commit
- * code to determine how CDCLK has changed (for instance did it increase or
- * decrease).
- */
-void intel_cdclk_swap_state(struct intel_atomic_state *state)
-{
-	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
-
-	swap(state->cdclk_state, dev_priv->cdclk_state);
-}
-
 void intel_dump_cdclk_config(const struct intel_cdclk_config *cdclk_config,
 			     const char *context)
 {
@@ -1904,14 +1873,22 @@ void
 intel_set_cdclk_pre_plane_update(struct intel_atomic_state *state)
 {
 	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
-	/* called after intel_cdclk_swap_state()! */
-	const struct intel_cdclk_state *old_cdclk_state = &state->cdclk_state;
-	const struct intel_cdclk_state *new_cdclk_state = &dev_priv->cdclk_state;
+	const struct intel_cdclk_state *old_cdclk_state =
+		intel_atomic_get_old_cdclk_state(state);
+	const struct intel_cdclk_state *new_cdclk_state =
+		intel_atomic_get_new_cdclk_state(state);
 	enum pipe pipe = new_cdclk_state->pipe;
 
+	if (!intel_cdclk_changed(&old_cdclk_state->actual,
+				 &new_cdclk_state->actual))
+		return;
+
 	if (pipe == INVALID_PIPE ||
-	    old_cdclk_state->actual.cdclk <= new_cdclk_state->actual.cdclk)
+	    old_cdclk_state->actual.cdclk <= new_cdclk_state->actual.cdclk) {
+		WARN_ON(!new_cdclk_state->base.changed);
+
 		intel_set_cdclk(dev_priv, &new_cdclk_state->actual, pipe);
+	}
 }
 
 /**
@@ -1925,14 +1902,22 @@ void
 intel_set_cdclk_post_plane_update(struct intel_atomic_state *state)
 {
 	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
-	/* called after intel_cdclk_swap_state()! */
-	const struct intel_cdclk_state *old_cdclk_state = &state->cdclk_state;
-	const struct intel_cdclk_state *new_cdclk_state = &dev_priv->cdclk_state;
+	const struct intel_cdclk_state *old_cdclk_state =
+		intel_atomic_get_old_cdclk_state(state);
+	const struct intel_cdclk_state *new_cdclk_state =
+		intel_atomic_get_new_cdclk_state(state);
 	enum pipe pipe = new_cdclk_state->pipe;
 
+	if (!intel_cdclk_changed(&old_cdclk_state->actual,
+				 &new_cdclk_state->actual))
+		return;
+
 	if (pipe != INVALID_PIPE &&
-	    old_cdclk_state->actual.cdclk > new_cdclk_state->actual.cdclk)
+	    old_cdclk_state->actual.cdclk > new_cdclk_state->actual.cdclk) {
+		WARN_ON(!new_cdclk_state->base.changed);
+
 		intel_set_cdclk(dev_priv, &new_cdclk_state->actual, pipe);
+	}
 }
 
 static int intel_pixel_rate_to_cdclk(const struct intel_crtc_state *crtc_state)
@@ -2059,10 +2044,10 @@ int intel_crtc_compute_min_cdclk(const struct intel_crtc_state *crtc_state)
 	return min_cdclk;
 }
 
-static int intel_compute_min_cdclk(struct intel_atomic_state *state)
+static int intel_compute_min_cdclk(struct intel_cdclk_state *cdclk_state)
 {
+	struct intel_atomic_state *state = cdclk_state->base.state;
 	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
-	struct intel_cdclk_state *cdclk_state = &state->cdclk_state;
 	struct intel_crtc *crtc;
 	struct intel_crtc_state *crtc_state;
 	int min_cdclk, i;
@@ -2080,7 +2065,7 @@ static int intel_compute_min_cdclk(struct intel_atomic_state *state)
 
 		cdclk_state->min_cdclk[i] = min_cdclk;
 
-		ret = _intel_atomic_lock_global_state(state);
+		ret = intel_atomic_lock_global_state(&cdclk_state->base);
 		if (ret)
 			return ret;
 	}
@@ -2105,10 +2090,10 @@ static int intel_compute_min_cdclk(struct intel_atomic_state *state)
  * future platforms this code will need to be
  * adjusted.
  */
-static int bxt_compute_min_voltage_level(struct intel_atomic_state *state)
+static int bxt_compute_min_voltage_level(struct intel_cdclk_state *cdclk_state)
 {
+	struct intel_atomic_state *state = cdclk_state->base.state;
 	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
-	struct intel_cdclk_state *cdclk_state = &state->cdclk_state;
 	struct intel_crtc *crtc;
 	struct intel_crtc_state *crtc_state;
 	u8 min_voltage_level;
@@ -2128,7 +2113,7 @@ static int bxt_compute_min_voltage_level(struct intel_atomic_state *state)
 
 		cdclk_state->min_voltage_level[i] = min_voltage_level;
 
-		ret = _intel_atomic_lock_global_state(state);
+		ret = intel_atomic_lock_global_state(&cdclk_state->base);
 		if (ret)
 			return ret;
 	}
@@ -2141,13 +2126,13 @@ static int bxt_compute_min_voltage_level(struct intel_atomic_state *state)
 	return min_voltage_level;
 }
 
-static int vlv_modeset_calc_cdclk(struct intel_atomic_state *state)
+static int vlv_modeset_calc_cdclk(struct intel_cdclk_state *cdclk_state)
 {
+	struct intel_atomic_state *state = cdclk_state->base.state;
 	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
-	struct intel_cdclk_state *cdclk_state = &state->cdclk_state;
 	int min_cdclk, cdclk;
 
-	min_cdclk = intel_compute_min_cdclk(state);
+	min_cdclk = intel_compute_min_cdclk(cdclk_state);
 	if (min_cdclk < 0)
 		return min_cdclk;
 
@@ -2170,12 +2155,12 @@ static int vlv_modeset_calc_cdclk(struct intel_atomic_state *state)
 	return 0;
 }
 
-static int bdw_modeset_calc_cdclk(struct intel_atomic_state *state)
+static int bdw_modeset_calc_cdclk(struct intel_cdclk_state *cdclk_state)
 {
-	struct intel_cdclk_state *cdclk_state = &state->cdclk_state;
+	struct intel_atomic_state *state = cdclk_state->base.state;
 	int min_cdclk, cdclk;
 
-	min_cdclk = intel_compute_min_cdclk(state);
+	min_cdclk = intel_compute_min_cdclk(cdclk_state);
 	if (min_cdclk < 0)
 		return min_cdclk;
 
@@ -2202,10 +2187,10 @@ static int bdw_modeset_calc_cdclk(struct intel_atomic_state *state)
 	return 0;
 }
 
-static int skl_dpll0_vco(struct intel_atomic_state *state)
+static int skl_dpll0_vco(struct intel_cdclk_state *cdclk_state)
 {
+	struct intel_atomic_state *state = cdclk_state->base.state;
 	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
-	struct intel_cdclk_state *cdclk_state = &state->cdclk_state;
 	struct intel_crtc *crtc;
 	struct intel_crtc_state *crtc_state;
 	int vco, i;
@@ -2239,16 +2224,16 @@ static int skl_dpll0_vco(struct intel_atomic_state *state)
 	return vco;
 }
 
-static int skl_modeset_calc_cdclk(struct intel_atomic_state *state)
+static int skl_modeset_calc_cdclk(struct intel_cdclk_state *cdclk_state)
 {
-	struct intel_cdclk_state *cdclk_state = &state->cdclk_state;
+	struct intel_atomic_state *state = cdclk_state->base.state;
 	int min_cdclk, cdclk, vco;
 
-	min_cdclk = intel_compute_min_cdclk(state);
+	min_cdclk = intel_compute_min_cdclk(cdclk_state);
 	if (min_cdclk < 0)
 		return min_cdclk;
 
-	vco = skl_dpll0_vco(state);
+	vco = skl_dpll0_vco(cdclk_state);
 
 	/*
 	 * FIXME should also account for plane ratio
@@ -2275,17 +2260,17 @@ static int skl_modeset_calc_cdclk(struct intel_atomic_state *state)
 	return 0;
 }
 
-static int bxt_modeset_calc_cdclk(struct intel_atomic_state *state)
+static int bxt_modeset_calc_cdclk(struct intel_cdclk_state *cdclk_state)
 {
+	struct intel_atomic_state *state = cdclk_state->base.state;
 	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
-	struct intel_cdclk_state *cdclk_state = &state->cdclk_state;
 	int min_cdclk, min_voltage_level, cdclk, vco;
 
-	min_cdclk = intel_compute_min_cdclk(state);
+	min_cdclk = intel_compute_min_cdclk(cdclk_state);
 	if (min_cdclk < 0)
 		return min_cdclk;
 
-	min_voltage_level = bxt_compute_min_voltage_level(state);
+	min_voltage_level = bxt_compute_min_voltage_level(cdclk_state);
 	if (min_voltage_level < 0)
 		return min_voltage_level;
 
@@ -2352,7 +2337,7 @@ static int intel_modeset_all_pipes(struct intel_atomic_state *state)
 	return 0;
 }
 
-static int fixed_modeset_calc_cdclk(struct intel_atomic_state *state)
+static int fixed_modeset_calc_cdclk(struct intel_cdclk_state *cdclk_state)
 {
 	int min_cdclk;
 
@@ -2361,54 +2346,95 @@ static int fixed_modeset_calc_cdclk(struct intel_atomic_state *state)
 	 * check that the required minimum frequency doesn't exceed
 	 * the actual cdclk frequency.
 	 */
-	min_cdclk = intel_compute_min_cdclk(state);
+	min_cdclk = intel_compute_min_cdclk(cdclk_state);
 	if (min_cdclk < 0)
 		return min_cdclk;
 
 	return 0;
 }
 
+static struct intel_global_state *intel_cdclk_duplicate_state(struct intel_global_obj *obj)
+{
+	struct intel_cdclk_state *cdclk_state;
+
+	cdclk_state = kmemdup(obj->state, sizeof(*cdclk_state), GFP_KERNEL);
+	if (!cdclk_state)
+		return NULL;
+
+	cdclk_state->force_min_cdclk_changed = false;
+	cdclk_state->pipe = INVALID_PIPE;
+
+	return &cdclk_state->base;
+}
+
+static void intel_cdclk_destroy_state(struct intel_global_obj *obj,
+				      struct intel_global_state *state)
+{
+	kfree(state);
+}
+
+static const struct intel_global_state_funcs intel_cdclk_funcs = {
+	.atomic_duplicate_state = intel_cdclk_duplicate_state,
+	.atomic_destroy_state = intel_cdclk_destroy_state,
+};
+
+struct intel_cdclk_state *
+intel_atomic_get_cdclk_state(struct intel_atomic_state *state)
+{
+	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
+	struct intel_global_state *cdclk_state;
+
+	cdclk_state = intel_atomic_get_global_obj_state(state, &dev_priv->cdclk.obj);
+	if (IS_ERR(cdclk_state))
+		return ERR_CAST(cdclk_state);
+
+	return to_intel_cdclk_state(cdclk_state);
+}
+
+int intel_cdclk_init(struct drm_i915_private *dev_priv)
+{
+	struct intel_cdclk_state *cdclk_state;
+
+	cdclk_state = kzalloc(sizeof(*cdclk_state), GFP_KERNEL);
+	if (!cdclk_state)
+		return -ENOMEM;
+
+	intel_atomic_global_obj_init(dev_priv, &dev_priv->cdclk.obj,
+				     &cdclk_state->base, &intel_cdclk_funcs);
+
+	return 0;
+}
+
 int intel_modeset_calc_cdclk(struct intel_atomic_state *state)
 {
 	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
-	const struct intel_cdclk_state *old_cdclk_state = &dev_priv->cdclk_state;
-	struct intel_cdclk_state *new_cdclk_state = &state->cdclk_state;
+	const struct intel_cdclk_state *old_cdclk_state;
+	struct intel_cdclk_state *new_cdclk_state;
 	enum pipe pipe;
 	int ret;
 
-	memcpy(new_cdclk_state->min_cdclk, old_cdclk_state->min_cdclk,
-	       sizeof(new_cdclk_state->min_cdclk));
-	memcpy(new_cdclk_state->min_voltage_level, old_cdclk_state->min_voltage_level,
-	       sizeof(new_cdclk_state->min_voltage_level));
+	new_cdclk_state = intel_atomic_get_cdclk_state(state);
+	if (IS_ERR(new_cdclk_state))
+		return PTR_ERR(new_cdclk_state);
 
-	/* keep the current setting */
-	if (!new_cdclk_state->force_min_cdclk_changed)
-		new_cdclk_state->force_min_cdclk = old_cdclk_state->force_min_cdclk;
+	old_cdclk_state = intel_atomic_get_old_cdclk_state(state);
 
-	new_cdclk_state->logical = old_cdclk_state->logical;
-	new_cdclk_state->actual = old_cdclk_state->actual;
-
-	ret = dev_priv->display.modeset_calc_cdclk(state);
+	ret = dev_priv->display.modeset_calc_cdclk(new_cdclk_state);
 	if (ret)
 		return ret;
 
-	/*
-	 * Writes to dev_priv->cdclk.{actual,logical} must protected
-	 * by holding all the crtc mutexes even if we don't end up
-	 * touching the hardware
-	 */
 	if (intel_cdclk_changed(&old_cdclk_state->actual,
 				&new_cdclk_state->actual)) {
 		/*
 		 * Also serialize commits across all crtcs
 		 * if the actual hw needs to be poked.
 		 */
-		ret = _intel_atomic_serialize_global_state(state);
+		ret = intel_atomic_serialize_global_state(&new_cdclk_state->base);
 		if (ret)
 			return ret;
 	} else if (intel_cdclk_changed(&old_cdclk_state->logical,
 				       &new_cdclk_state->logical)) {
-		ret = _intel_atomic_lock_global_state(state);
+		ret = intel_atomic_lock_global_state(&new_cdclk_state->base);
 		if (ret)
 			return ret;
 	} else {

drivers/gpu/drm/i915/display/intel_cdclk.h

@@ -8,11 +8,12 @@
 
 #include <linux/types.h>
 
+#include "i915_drv.h"
 #include "intel_display.h"
+#include "intel_global_state.h"
 
 struct drm_i915_private;
 struct intel_atomic_state;
-struct intel_cdclk_config;
 struct intel_crtc_state;
 
 struct intel_cdclk_vals {
@@ -22,6 +23,35 @@ struct intel_cdclk_vals {
 	u8 ratio;
 };
 
+struct intel_cdclk_state {
+	struct intel_global_state base;
+
+	/*
+	 * Logical configuration of cdclk (used for all scaling,
+	 * watermark, etc. calculations and checks). This is
+	 * computed as if all enabled crtcs were active.
+	 */
+	struct intel_cdclk_config logical;
+
+	/*
+	 * Actual configuration of cdclk, can be different from the
+	 * logical configuration only when all crtc's are DPMS off.
+	 */
+	struct intel_cdclk_config actual;
+
+	/* minimum acceptable cdclk for each pipe */
+	int min_cdclk[I915_MAX_PIPES];
+	/* minimum acceptable voltage level for each pipe */
+	u8 min_voltage_level[I915_MAX_PIPES];
+
+	/* pipe to which cd2x update is synchronized */
+	enum pipe pipe;
+
+	/* forced minimum cdclk for glk+ audio w/a */
+	int force_min_cdclk;
+	bool force_min_cdclk_changed;
+};
+
 int intel_crtc_compute_min_cdclk(const struct intel_crtc_state *crtc_state);
 void intel_cdclk_init_hw(struct drm_i915_private *i915);
 void intel_cdclk_uninit_hw(struct drm_i915_private *i915);
@@ -31,12 +61,21 @@ void intel_update_cdclk(struct drm_i915_private *dev_priv);
 void intel_update_rawclk(struct drm_i915_private *dev_priv);
 bool intel_cdclk_needs_modeset(const struct intel_cdclk_config *a,
 			       const struct intel_cdclk_config *b);
-void intel_cdclk_clear_state(struct intel_atomic_state *state);
-void intel_cdclk_swap_state(struct intel_atomic_state *state);
 void intel_set_cdclk_pre_plane_update(struct intel_atomic_state *state);
 void intel_set_cdclk_post_plane_update(struct intel_atomic_state *state);
 void intel_dump_cdclk_config(const struct intel_cdclk_config *cdclk_config,
 			     const char *context);
 int intel_modeset_calc_cdclk(struct intel_atomic_state *state);
 
+struct intel_cdclk_state *
+intel_atomic_get_cdclk_state(struct intel_atomic_state *state);
+
+#define to_intel_cdclk_state(x) container_of((x), struct intel_cdclk_state, base)
+#define intel_atomic_get_old_cdclk_state(state) \
+	to_intel_cdclk_state(intel_atomic_get_old_global_obj_state(state, &to_i915(state->base.dev)->cdclk.obj))
+#define intel_atomic_get_new_cdclk_state(state) \
+	to_intel_cdclk_state(intel_atomic_get_new_global_obj_state(state, &to_i915(state->base.dev)->cdclk.obj))
+
+int intel_cdclk_init(struct drm_i915_private *dev_priv);
+
 #endif /* __INTEL_CDCLK_H__ */

drivers/gpu/drm/i915/display/intel_display.c

@@ -7532,7 +7532,7 @@ static void intel_crtc_disable_noatomic(struct intel_crtc *crtc,
 	struct intel_bw_state *bw_state =
 		to_intel_bw_state(dev_priv->bw_obj.state);
 	struct intel_cdclk_state *cdclk_state =
-		&dev_priv->cdclk_state;
+		to_intel_cdclk_state(dev_priv->cdclk.obj.state);
 	struct intel_crtc_state *crtc_state =
 		to_intel_crtc_state(crtc->base.state);
 	enum intel_display_power_domain domain;
@@ -7841,17 +7841,17 @@ bool hsw_crtc_state_ips_capable(const struct intel_crtc_state *crtc_state)
 	return true;
 }
 
-static bool hsw_compute_ips_config(struct intel_crtc_state *crtc_state)
+static int hsw_compute_ips_config(struct intel_crtc_state *crtc_state)
 {
 	struct drm_i915_private *dev_priv =
 		to_i915(crtc_state->uapi.crtc->dev);
-	struct intel_atomic_state *intel_state =
+	struct intel_atomic_state *state =
 		to_intel_atomic_state(crtc_state->uapi.state);
-	const struct intel_cdclk_state *cdclk_state =
-		&intel_state->cdclk_state;
+
+	crtc_state->ips_enabled = false;
 
 	if (!hsw_crtc_state_ips_capable(crtc_state))
-		return false;
+		return 0;
 
 	/*
 	 * When IPS gets enabled, the pipe CRC changes. Since IPS gets
@@ -7860,18 +7860,27 @@ static bool hsw_compute_ips_config(struct intel_crtc_state *crtc_state)
 	 * completely disable it.
 	 */
 	if (crtc_state->crc_enabled)
-		return false;
+		return 0;
 
 	/* IPS should be fine as long as at least one plane is enabled. */
 	if (!(crtc_state->active_planes & ~BIT(PLANE_CURSOR)))
-		return false;
+		return 0;
 
-	/* pixel rate mustn't exceed 95% of cdclk with IPS on BDW */
-	if (IS_BROADWELL(dev_priv) &&
-	    crtc_state->pixel_rate > cdclk_state->logical.cdclk * 95 / 100)
-		return false;
+	if (IS_BROADWELL(dev_priv)) {
+		const struct intel_cdclk_state *cdclk_state;
 
-	return true;
+		cdclk_state = intel_atomic_get_cdclk_state(state);
+		if (IS_ERR(cdclk_state))
+			return PTR_ERR(cdclk_state);
+
+		/* pixel rate mustn't exceed 95% of cdclk with IPS on BDW */
+		if (crtc_state->pixel_rate > cdclk_state->logical.cdclk * 95 / 100)
+			return 0;
+	}
+
+	crtc_state->ips_enabled = true;
+
+	return 0;
 }
 
 static bool intel_crtc_supports_double_wide(const struct intel_crtc *crtc)
@@ -12686,14 +12695,11 @@ static u16 hsw_linetime_wm(const struct intel_crtc_state *crtc_state)
 				 adjusted_mode->crtc_clock);
 }
 
-static u16 hsw_ips_linetime_wm(const struct intel_crtc_state *crtc_state)
+static u16 hsw_ips_linetime_wm(const struct intel_crtc_state *crtc_state,
+			       const struct intel_cdclk_state *cdclk_state)
 {
-	const struct intel_atomic_state *state =
-		to_intel_atomic_state(crtc_state->uapi.state);
 	const struct drm_display_mode *adjusted_mode =
 		&crtc_state->hw.adjusted_mode;
-	const struct intel_cdclk_state *cdclk_state =
-		&state->cdclk_state;
 
 	if (!crtc_state->hw.enable)
 		return 0;
@@ -12723,6 +12729,32 @@ static u16 skl_linetime_wm(const struct intel_crtc_state *crtc_state)
 	return linetime_wm;
 }
 
+static int hsw_compute_linetime_wm(struct intel_atomic_state *state,
+				   struct intel_crtc *crtc)
+{
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	struct intel_crtc_state *crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+	const struct intel_cdclk_state *cdclk_state;
+
+	if (INTEL_GEN(dev_priv) >= 9)
+		crtc_state->linetime = skl_linetime_wm(crtc_state);
+	else
+		crtc_state->linetime = hsw_linetime_wm(crtc_state);
+
+	if (!hsw_crtc_supports_ips(crtc))
+		return 0;
+
+	cdclk_state = intel_atomic_get_cdclk_state(state);
+	if (IS_ERR(cdclk_state))
+		return PTR_ERR(cdclk_state);
+
+	crtc_state->ips_linetime = hsw_ips_linetime_wm(crtc_state,
+						       cdclk_state);
+
+	return 0;
+}
+
 static int intel_crtc_atomic_check(struct intel_atomic_state *state,
 				   struct intel_crtc *crtc)
 {
@@ -12758,7 +12790,6 @@ static int intel_crtc_atomic_check(struct intel_atomic_state *state,
 			return ret;
 	}
 
-	ret = 0;
 	if (dev_priv->display.compute_pipe_wm) {
 		ret = dev_priv->display.compute_pipe_wm(crtc_state);
 		if (ret) {
@@ -12791,20 +12822,25 @@ static int intel_crtc_atomic_check(struct intel_atomic_state *state,
 		if (!ret)
 			ret = intel_atomic_setup_scalers(dev_priv, crtc,
 							 crtc_state);
+		if (ret)
+			return ret;
 	}
 
-	if (HAS_IPS(dev_priv))
-		crtc_state->ips_enabled = hsw_compute_ips_config(crtc_state);
+	if (HAS_IPS(dev_priv)) {
+		ret = hsw_compute_ips_config(crtc_state);
+		if (ret)
+			return ret;
+	}
+
+	if (INTEL_GEN(dev_priv) >= 9 ||
+	    IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv)) {
+		ret = hsw_compute_linetime_wm(state, crtc);
+		if (ret)
+			return ret;
 
-	if (INTEL_GEN(dev_priv) >= 9) {
-		crtc_state->linetime = skl_linetime_wm(crtc_state);
-	} else if (IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv)) {
-		crtc_state->linetime = hsw_linetime_wm(crtc_state);
-		if (hsw_crtc_supports_ips(crtc))
-			crtc_state->ips_linetime = hsw_ips_linetime_wm(crtc_state);
 	}
 
-	return ret;
+	return 0;
 }
 
 static void intel_modeset_update_connector_atomic_state(struct drm_device *dev)
@@ -14659,7 +14695,7 @@ static bool active_planes_affects_min_cdclk(struct drm_i915_private *dev_priv)
 }
 
 static int intel_atomic_check_planes(struct intel_atomic_state *state,
-				     bool *need_modeset)
+				     bool *need_cdclk_calc)
 {
 	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
 	struct intel_crtc_state *old_crtc_state, *new_crtc_state;
@@ -14714,8 +14750,11 @@ static int intel_atomic_check_planes(struct intel_atomic_state *state,
 	 * affected planes are part of the state. We can now
 	 * compute the minimum cdclk for each plane.
 	 */
-	for_each_new_intel_plane_in_state(state, plane, plane_state, i)
-		*need_modeset |= intel_plane_calc_min_cdclk(state, plane);
+	for_each_new_intel_plane_in_state(state, plane, plane_state, i) {
+		ret = intel_plane_calc_min_cdclk(state, plane, need_cdclk_calc);
+		if (ret)
+			return ret;
+	}
 
 	return 0;
 }
@@ -14838,6 +14877,7 @@ static int intel_atomic_check(struct drm_device *dev,
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct intel_atomic_state *state = to_intel_atomic_state(_state);
 	struct intel_crtc_state *old_crtc_state, *new_crtc_state;
+	struct intel_cdclk_state *new_cdclk_state;
 	struct intel_crtc *crtc;
 	int ret, i;
 	bool any_ms = false;
@@ -14953,18 +14993,18 @@ static int intel_atomic_check(struct drm_device *dev,
 	if (ret)
 		goto fail;
 
-	any_ms |= state->cdclk_state.force_min_cdclk_changed;
-
 	ret = intel_atomic_check_planes(state, &any_ms);
 	if (ret)
 		goto fail;
 
+	new_cdclk_state = intel_atomic_get_new_cdclk_state(state);
+	if (new_cdclk_state && new_cdclk_state->force_min_cdclk_changed)
+		any_ms = true;
+
 	if (any_ms) {
 		ret = intel_modeset_checks(state);
 		if (ret)
 			goto fail;
-	} else {
-		state->cdclk_state.logical = dev_priv->cdclk_state.logical;
 	}
 
 	ret = intel_atomic_check_crtcs(state);
@@ -15866,8 +15906,6 @@ static int intel_atomic_commit(struct drm_device *dev,
 		assert_global_state_locked(dev_priv);
 
 		dev_priv->active_pipes = state->active_pipes;
-
-		intel_cdclk_swap_state(state);
 	}
 
 	drm_atomic_state_get(&state->base);
@@ -17573,7 +17611,7 @@ void intel_init_display_hooks(struct drm_i915_private *dev_priv)
 void intel_modeset_init_hw(struct drm_i915_private *i915)
 {
 	struct intel_cdclk_state *cdclk_state =
-		&i915->cdclk_state;
+		to_intel_cdclk_state(i915->cdclk.obj.state);
 
 	intel_update_cdclk(i915);
 	intel_dump_cdclk_config(&i915->cdclk.hw, "Current CDCLK");
@@ -17828,6 +17866,10 @@ int intel_modeset_init(struct drm_i915_private *i915)
 
 	intel_mode_config_init(i915);
 
+	ret = intel_cdclk_init(i915);
+	if (ret)
+		return ret;
+
 	ret = intel_bw_init(i915);
 	if (ret)
 		return ret;
@@ -18318,6 +18360,8 @@ static void readout_plane_state(struct drm_i915_private *dev_priv)
 static void intel_modeset_readout_hw_state(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = to_i915(dev);
+	struct intel_cdclk_state *cdclk_state =
+		to_intel_cdclk_state(dev_priv->cdclk.obj.state);
 	enum pipe pipe;
 	struct intel_crtc *crtc;
 	struct intel_encoder *encoder;
@@ -18441,8 +18485,6 @@ static void intel_modeset_readout_hw_state(struct drm_device *dev)
 	for_each_intel_crtc(dev, crtc) {
 		struct intel_bw_state *bw_state =
 			to_intel_bw_state(dev_priv->bw_obj.state);
-		struct intel_cdclk_state *cdclk_state =
-			&dev_priv->cdclk_state;
 		struct intel_crtc_state *crtc_state =
 			to_intel_crtc_state(crtc->base.state);
 		struct intel_plane *plane;

drivers/gpu/drm/i915/display/intel_display_types.h

@@ -466,8 +466,6 @@ struct intel_atomic_state {
 	struct __intel_global_objs_state *global_objs;
 	int num_global_objs;
 
-	struct intel_cdclk_state cdclk_state;
-
 	bool dpll_set, modeset;
 
 	/*
@@ -494,7 +492,6 @@ struct intel_atomic_state {
 
 	/*
 	 * active_pipes
-	 * cdclk_state
 	 */
 	bool global_state_changed;
 

drivers/gpu/drm/i915/i915_drv.h

@@ -65,7 +65,6 @@
 #include "i915_utils.h"
 
 #include "display/intel_bios.h"
-#include "display/intel_cdclk.h"
 #include "display/intel_display.h"
 #include "display/intel_display_power.h"
 #include "display/intel_dpll_mgr.h"
@@ -256,7 +255,8 @@ struct intel_connector;
 struct intel_encoder;
 struct intel_atomic_state;
 struct intel_cdclk_config;
-struct intel_crtc_state;
+struct intel_cdclk_state;
+struct intel_cdclk_vals;
 struct intel_initial_plane_config;
 struct intel_crtc;
 struct intel_limit;
@@ -280,7 +280,7 @@ struct drm_i915_display_funcs {
 				    struct intel_crtc *crtc);
 	int (*compute_global_watermarks)(struct intel_atomic_state *state);
 	void (*update_wm)(struct intel_crtc *crtc);
-	int (*modeset_calc_cdclk)(struct intel_atomic_state *state);
+	int (*modeset_calc_cdclk)(struct intel_cdclk_state *state);
 	u8 (*calc_voltage_level)(int cdclk);
 	/* Returns the active state of the crtc, and if the crtc is active,
 	 * fills out the pipe-config with the hw state. */
@@ -889,33 +889,6 @@ struct i915_selftest_stash {
 	atomic_t counter;
 };
 
-struct intel_cdclk_state {
-	/*
-	 * Logical configuration of cdclk (used for all scaling,
-	 * watermark, etc. calculations and checks). This is
-	 * computed as if all enabled crtcs were active.
-	 */
-	struct intel_cdclk_config logical;
-
-	/*
-	 * Actual configuration of cdclk, can be different from the
-	 * logical configuration only when all crtc's are DPMS off.
-	 */
-	struct intel_cdclk_config actual;
-
-	/* minimum acceptable cdclk for each pipe */
-	int min_cdclk[I915_MAX_PIPES];
-	/* minimum acceptable voltage level for each pipe */
-	u8 min_voltage_level[I915_MAX_PIPES];
-
-	/* pipe to which cd2x update is synchronized */
-	enum pipe pipe;
-
-	/* forced minimum cdclk for glk+ audio w/a */
-	int force_min_cdclk;
-	bool force_min_cdclk_changed;
-};
-
 struct drm_i915_private {
 	struct drm_device drm;
 
@@ -1032,18 +1005,14 @@ struct drm_i915_private {
 	unsigned int fdi_pll_freq;
 	unsigned int czclk_freq;
 
-	/*
-	 * For reading holding any crtc lock is sufficient,
-	 * for writing must hold all of them.
-	 */
-	struct intel_cdclk_state cdclk_state;
-
 	struct {
 		/* The current hardware cdclk configuration */
 		struct intel_cdclk_config hw;
 
 		/* cdclk, divider, and ratio table from bspec */
 		const struct intel_cdclk_vals *table;
+
+		struct intel_global_obj obj;
 	} cdclk;
 
 	/**
@@ -1102,8 +1071,8 @@ struct drm_i915_private {
 	struct list_head global_obj_list;
 
 	/*
-	 * For reading active_pipes, cdclk_state holding any crtc
-	 * lock is sufficient, for writing must hold all of them.
+	 * For reading active_pipes holding any crtc lock is
+	 * sufficient, for writing must hold all of them.
 	 */
 	u8 active_pipes;