[PATCH 08/14] drm/i915: Track full cdclk state for the logical and actual cdclk frequencies

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From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>

The current dev_cdclk vs. cdclk vs. atomic_cdclk_freq is quite a mess.
So here I'm introducing the "actual" and "logical" naming for our
cdclk state. "actual" is what we'll bash into the hardware and "logical"
is what everyone should use for state computaion/checking and whatnot.
We'll track both using the intel_cdclk_state as both will need other
differing parameters than just the actual cdclk frequency.

While doing that we can at the same time unify the appearance of the
.modeset_calc_cdclk() implementations a little bit.

Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/i915/i915_drv.h      |  13 ++--
 drivers/gpu/drm/i915/intel_cdclk.c   | 115 ++++++++++++++++++++++++-----------
 drivers/gpu/drm/i915/intel_display.c |  39 ++++++------
 drivers/gpu/drm/i915/intel_dp.c      |   2 +-
 drivers/gpu/drm/i915/intel_drv.h     |  22 ++++---
 drivers/gpu/drm/i915/intel_pm.c      |   4 +-
 6 files changed, 120 insertions(+), 75 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index a4f1231ff8ca..b5a8d0f4cfbd 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2237,18 +2237,19 @@ struct drm_i915_private {
 	unsigned int skl_preferred_vco_freq;
 	unsigned int max_cdclk_freq;
 
-	/*
-	 * For reading holding any crtc lock is sufficient,
-	 * for writing must hold all of them.
-	 */
-	unsigned int atomic_cdclk_freq;
-
 	unsigned int max_dotclk_freq;
 	unsigned int rawclk_freq;
 	unsigned int hpll_freq;
 	unsigned int czclk_freq;
 
 	struct {
+		/*
+		 * The current logical cdclk state.
+		 * For reading holding any crtc lock is sufficient,
+		 * for writing must hold all of them.
+		 */
+		struct intel_cdclk_state logical;
+		struct intel_cdclk_state actual;
 		struct intel_cdclk_state hw;
 	} cdclk;
 
diff --git a/drivers/gpu/drm/i915/intel_cdclk.c b/drivers/gpu/drm/i915/intel_cdclk.c
index 7c128d2138a1..bd7ad9abcee5 100644
--- a/drivers/gpu/drm/i915/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/intel_cdclk.c
@@ -1368,12 +1368,26 @@ static int vlv_modeset_calc_cdclk(struct drm_atomic_state *state)
 	int max_pixclk = intel_max_pixel_rate(state);
 	struct intel_atomic_state *intel_state =
 		to_intel_atomic_state(state);
+	int cdclk;
 
-	intel_state->cdclk = intel_state->dev_cdclk =
-		vlv_calc_cdclk(dev_priv, max_pixclk);
+	cdclk = vlv_calc_cdclk(dev_priv, max_pixclk);
 
-	if (!intel_state->active_crtcs)
-		intel_state->dev_cdclk = vlv_calc_cdclk(dev_priv, 0);
+	if (cdclk > dev_priv->max_cdclk_freq) {
+		DRM_DEBUG_KMS("requested cdclk (%d kHz) exceeds max (%d kHz)\n",
+			      cdclk, dev_priv->max_cdclk_freq);
+		return -EINVAL;
+	}
+
+	intel_state->cdclk.logical.cdclk = cdclk;
+
+	if (!intel_state->active_crtcs) {
+		cdclk = vlv_calc_cdclk(dev_priv, 0);
+
+		intel_state->cdclk.actual.cdclk = cdclk;
+	} else {
+		intel_state->cdclk.actual =
+			intel_state->cdclk.logical;
+	}
 
 	return 0;
 }
@@ -1384,7 +1398,7 @@ static void vlv_modeset_commit_cdclk(struct drm_atomic_state *old_state)
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct intel_atomic_state *old_intel_state =
 		to_intel_atomic_state(old_state);
-	unsigned int req_cdclk = old_intel_state->dev_cdclk;
+	unsigned int req_cdclk = old_intel_state->cdclk.actual.cdclk;
 
 	/*
 	 * FIXME: We can end up here with all power domains off, yet
@@ -1426,9 +1440,16 @@ static int bdw_modeset_calc_cdclk(struct drm_atomic_state *state)
 		return -EINVAL;
 	}
 
-	intel_state->cdclk = intel_state->dev_cdclk = cdclk;
-	if (!intel_state->active_crtcs)
-		intel_state->dev_cdclk = bdw_calc_cdclk(0);
+	intel_state->cdclk.logical.cdclk = cdclk;
+
+	if (!intel_state->active_crtcs) {
+		cdclk = bdw_calc_cdclk(0);
+
+		intel_state->cdclk.actual.cdclk = cdclk;
+	} else {
+		intel_state->cdclk.actual =
+			intel_state->cdclk.logical;
+	}
 
 	return 0;
 }
@@ -1438,7 +1459,7 @@ static void bdw_modeset_commit_cdclk(struct drm_atomic_state *old_state)
 	struct drm_device *dev = old_state->dev;
 	struct intel_atomic_state *old_intel_state =
 		to_intel_atomic_state(old_state);
-	unsigned int req_cdclk = old_intel_state->dev_cdclk;
+	unsigned int req_cdclk = old_intel_state->cdclk.actual.cdclk;
 
 	bdw_set_cdclk(dev, req_cdclk);
 }
@@ -1448,8 +1469,11 @@ static int skl_modeset_calc_cdclk(struct drm_atomic_state *state)
 	struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
 	struct drm_i915_private *dev_priv = to_i915(state->dev);
 	const int max_pixclk = intel_max_pixel_rate(state);
-	int vco = intel_state->cdclk_pll_vco;
-	int cdclk;
+	int cdclk, vco;
+
+	vco = intel_state->cdclk.logical.vco;
+	if (!vco)
+		vco = dev_priv->skl_preferred_vco_freq;
 
 	/*
 	 * FIXME should also account for plane ratio
@@ -1457,19 +1481,24 @@ static int skl_modeset_calc_cdclk(struct drm_atomic_state *state)
 	 */
 	cdclk = skl_calc_cdclk(max_pixclk, vco);
 
-	/*
-	 * FIXME move the cdclk caclulation to
-	 * compute_config() so we can fail gracegully.
-	 */
 	if (cdclk > dev_priv->max_cdclk_freq) {
-		DRM_ERROR("requested cdclk (%d kHz) exceeds max (%d kHz)\n",
-			  cdclk, dev_priv->max_cdclk_freq);
-		cdclk = dev_priv->max_cdclk_freq;
+		DRM_DEBUG_KMS("requested cdclk (%d kHz) exceeds max (%d kHz)\n",
+			      cdclk, dev_priv->max_cdclk_freq);
+		return -EINVAL;
 	}
 
-	intel_state->cdclk = intel_state->dev_cdclk = cdclk;
-	if (!intel_state->active_crtcs)
-		intel_state->dev_cdclk = skl_calc_cdclk(0, vco);
+	intel_state->cdclk.logical.vco = vco;
+	intel_state->cdclk.logical.cdclk = cdclk;
+
+	if (!intel_state->active_crtcs) {
+		cdclk = skl_calc_cdclk(0, vco);
+
+		intel_state->cdclk.actual.vco = vco;
+		intel_state->cdclk.actual.cdclk = cdclk;
+	} else {
+		intel_state->cdclk.actual =
+			intel_state->cdclk.logical;
+	}
 
 	return 0;
 }
@@ -1479,8 +1508,8 @@ static void skl_modeset_commit_cdclk(struct drm_atomic_state *old_state)
 	struct drm_i915_private *dev_priv = to_i915(old_state->dev);
 	struct intel_atomic_state *intel_state =
 		to_intel_atomic_state(old_state);
-	unsigned int req_cdclk = intel_state->dev_cdclk;
-	unsigned int req_vco = intel_state->cdclk_pll_vco;
+	unsigned int req_cdclk = intel_state->cdclk.actual.cdclk;
+	unsigned int req_vco = intel_state->cdclk.actual.vco;
 
 	skl_set_cdclk(dev_priv, req_cdclk, req_vco);
 }
@@ -1491,22 +1520,39 @@ static int bxt_modeset_calc_cdclk(struct drm_atomic_state *state)
 	int max_pixclk = intel_max_pixel_rate(state);
 	struct intel_atomic_state *intel_state =
 		to_intel_atomic_state(state);
-	int cdclk;
+	int cdclk, vco;
 
-	if (IS_GEMINILAKE(dev_priv))
+	if (IS_GEMINILAKE(dev_priv)) {
 		cdclk = glk_calc_cdclk(max_pixclk);
-	else
+		vco = glk_de_pll_vco(dev_priv, cdclk);
+	} else {
 		cdclk = bxt_calc_cdclk(max_pixclk);
+		vco = bxt_de_pll_vco(dev_priv, cdclk);
+	}
 
-	intel_state->cdclk = intel_state->dev_cdclk = cdclk;
+	if (cdclk > dev_priv->max_cdclk_freq) {
+		DRM_DEBUG_KMS("requested cdclk (%d kHz) exceeds max (%d kHz)\n",
+			      cdclk, dev_priv->max_cdclk_freq);
+		return -EINVAL;
+	}
+
+	intel_state->cdclk.logical.vco = vco;
+	intel_state->cdclk.logical.cdclk = cdclk;
 
 	if (!intel_state->active_crtcs) {
-		if (IS_GEMINILAKE(dev_priv))
+		if (IS_GEMINILAKE(dev_priv)) {
 			cdclk = glk_calc_cdclk(0);
-		else
+			vco = glk_de_pll_vco(dev_priv, cdclk);
+		} else {
 			cdclk = bxt_calc_cdclk(0);
+			vco = bxt_de_pll_vco(dev_priv, cdclk);
+		}
 
-		intel_state->dev_cdclk = cdclk;
+		intel_state->cdclk.actual.vco = vco;
+		intel_state->cdclk.actual.cdclk = cdclk;
+	} else {
+		intel_state->cdclk.actual =
+			intel_state->cdclk.logical;
 	}
 
 	return 0;
@@ -1517,13 +1563,8 @@ static void bxt_modeset_commit_cdclk(struct drm_atomic_state *old_state)
 	struct drm_i915_private *dev_priv = to_i915(old_state->dev);
 	struct intel_atomic_state *old_intel_state =
 		to_intel_atomic_state(old_state);
-	unsigned int req_cdclk = old_intel_state->dev_cdclk;
-	unsigned int req_vco;
-
-	if (IS_GEMINILAKE(dev_priv))
-		req_vco = glk_de_pll_vco(dev_priv, req_cdclk);
-	else
-		req_vco = bxt_de_pll_vco(dev_priv, req_cdclk);
+	unsigned int req_cdclk = old_intel_state->cdclk.actual.cdclk;
+	unsigned int req_vco = old_intel_state->cdclk.actual.vco;
 
 	bxt_set_cdclk(dev_priv, req_cdclk, req_vco);
 }
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 6c38ab299506..00f047324a4f 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -12416,6 +12416,8 @@ static int intel_modeset_checks(struct drm_atomic_state *state)
 
 	intel_state->modeset = true;
 	intel_state->active_crtcs = dev_priv->active_crtcs;
+	intel_state->cdclk.logical = dev_priv->cdclk.logical;
+	intel_state->cdclk.actual = dev_priv->cdclk.actual;
 
 	for_each_crtc_in_state(state, crtc, crtc_state, i) {
 		if (crtc_state->active)
@@ -12435,38 +12437,35 @@ static int intel_modeset_checks(struct drm_atomic_state *state)
 	 * adjusted_mode bits in the crtc directly.
 	 */
 	if (dev_priv->display.modeset_calc_cdclk) {
-		if (!intel_state->cdclk_pll_vco)
-			intel_state->cdclk_pll_vco = dev_priv->cdclk.hw.vco;
-		if (!intel_state->cdclk_pll_vco)
-			intel_state->cdclk_pll_vco = dev_priv->skl_preferred_vco_freq;
-
 		ret = dev_priv->display.modeset_calc_cdclk(state);
 		if (ret < 0)
 			return ret;
 
 		/*
-		 * Writes to dev_priv->atomic_cdclk_freq must protected by
+		 * Writes to dev_priv->cdclk_locical must protected by
 		 * holding all the crtc locks, even if we don't end up
 		 * touching the hardware
 		 */
-		if (intel_state->cdclk != dev_priv->atomic_cdclk_freq) {
+		if (!intel_cdclk_state_compare(&dev_priv->cdclk.logical,
+					       &intel_state->cdclk.logical)) {
 			ret = intel_lock_all_pipes(state);
 			if (ret < 0)
 				return ret;
 		}
 
 		/* All pipes must be switched off while we change the cdclk. */
-		if (intel_state->dev_cdclk != dev_priv->cdclk.hw.cdclk ||
-		    intel_state->cdclk_pll_vco != dev_priv->cdclk.hw.vco) {
+		if (!intel_cdclk_state_compare(&dev_priv->cdclk.actual,
+					       &intel_state->cdclk.actual)) {
 			ret = intel_modeset_all_pipes(state);
 			if (ret < 0)
 				return ret;
 		}
 
-		DRM_DEBUG_KMS("New cdclk calculated to be atomic %u, actual %u\n",
-			      intel_state->cdclk, intel_state->dev_cdclk);
+		DRM_DEBUG_KMS("New cdclk calculated to be logical %u kHz, actual %u kHz\n",
+			      intel_state->cdclk.logical.cdclk,
+			      intel_state->cdclk.actual.cdclk);
 	} else {
-		to_intel_atomic_state(state)->cdclk = dev_priv->atomic_cdclk_freq;
+		to_intel_atomic_state(state)->cdclk.logical = dev_priv->cdclk.logical;
 	}
 
 	intel_modeset_clear_plls(state);
@@ -12569,7 +12568,7 @@ static int intel_atomic_check(struct drm_device *dev,
 		if (ret)
 			return ret;
 	} else {
-		intel_state->cdclk = dev_priv->atomic_cdclk_freq;
+		intel_state->cdclk.logical = dev_priv->cdclk.logical;
 	}
 
 	ret = drm_atomic_helper_check_planes(dev, state);
@@ -12874,8 +12873,8 @@ static void intel_atomic_commit_tail(struct drm_atomic_state *state)
 		drm_atomic_helper_update_legacy_modeset_state(state->dev, state);
 
 		if (dev_priv->display.modeset_commit_cdclk &&
-		    (intel_state->dev_cdclk != dev_priv->cdclk.hw.cdclk ||
-		     intel_state->cdclk_pll_vco != dev_priv->cdclk.hw.vco))
+		    !intel_cdclk_state_compare(&dev_priv->cdclk.actual,
+					       &intel_state->cdclk.actual))
 			dev_priv->display.modeset_commit_cdclk(state);
 
 		/*
@@ -13056,7 +13055,8 @@ static int intel_atomic_commit(struct drm_device *dev,
 		memcpy(dev_priv->min_pixclk, intel_state->min_pixclk,
 		       sizeof(intel_state->min_pixclk));
 		dev_priv->active_crtcs = intel_state->active_crtcs;
-		dev_priv->atomic_cdclk_freq = intel_state->cdclk;
+		dev_priv->cdclk.logical = intel_state->cdclk.logical;
+		dev_priv->cdclk.actual = intel_state->cdclk.actual;
 	}
 
 	drm_atomic_state_get(state);
@@ -13298,7 +13298,7 @@ skl_max_scale(struct intel_crtc *intel_crtc, struct intel_crtc_state *crtc_state
 		return DRM_PLANE_HELPER_NO_SCALING;
 
 	crtc_clock = crtc_state->base.adjusted_mode.crtc_clock;
-	cdclk = to_intel_atomic_state(crtc_state->base.state)->cdclk;
+	cdclk = to_intel_atomic_state(crtc_state->base.state)->cdclk.logical.cdclk;
 
 	if (WARN_ON_ONCE(!crtc_clock || cdclk < crtc_clock))
 		return DRM_PLANE_HELPER_NO_SCALING;
@@ -14723,8 +14723,7 @@ void intel_modeset_init_hw(struct drm_device *dev)
 	struct drm_i915_private *dev_priv = to_i915(dev);
 
 	intel_update_cdclk(dev_priv);
-
-	dev_priv->atomic_cdclk_freq = dev_priv->cdclk.hw.cdclk;
+	dev_priv->cdclk.logical = dev_priv->cdclk.actual = dev_priv->cdclk.hw;
 
 	intel_init_clock_gating(dev_priv);
 }
@@ -14897,7 +14896,7 @@ int intel_modeset_init(struct drm_device *dev)
 
 	intel_update_czclk(dev_priv);
 	intel_update_cdclk(dev_priv);
-	dev_priv->atomic_cdclk_freq = dev_priv->cdclk.hw.cdclk;
+	dev_priv->cdclk.logical = dev_priv->cdclk.actual = dev_priv->cdclk.hw;
 
 	intel_shared_dpll_init(dev);
 
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 73a708b8d887..4309509e8a34 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1734,7 +1734,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
 			break;
 		}
 
-		to_intel_atomic_state(pipe_config->base.state)->cdclk_pll_vco = vco;
+		to_intel_atomic_state(pipe_config->base.state)->cdclk.logical.vco = vco;
 	}
 
 	if (!HAS_DDI(dev_priv))
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index c062f063bfbc..605a47fd4a85 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -333,13 +333,20 @@ struct dpll {
 struct intel_atomic_state {
 	struct drm_atomic_state base;
 
-	unsigned int cdclk;
+	struct {
+		/*
+		 * Logical state of cdclk (used for all scaling, watermark,
+		 * etc. calculations and checks). This is computed as if all
+		 * enabled crtcs were active.
+		 */
+		struct intel_cdclk_state logical;
 
-	/*
-	 * Calculated device cdclk, can be different from cdclk
-	 * only when all crtc's are DPMS off.
-	 */
-	unsigned int dev_cdclk;
+		/*
+		 * Actual state of cdclk, can be different from the logical
+		 * state only when all crtc's are DPMS off.
+		 */
+		struct intel_cdclk_state actual;
+	} cdclk;
 
 	bool dpll_set, modeset;
 
@@ -356,9 +363,6 @@ struct intel_atomic_state {
 	unsigned int active_crtcs;
 	unsigned int min_pixclk[I915_MAX_PIPES];
 
-	/* SKL/KBL Only */
-	unsigned int cdclk_pll_vco;
-
 	struct intel_shared_dpll_config shared_dpll[I915_NUM_PLLS];
 
 	/*
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 79e2be4216e4..fe522ec21502 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2095,7 +2095,7 @@ hsw_compute_linetime_wm(const struct intel_crtc_state *cstate)
 		return 0;
 	if (WARN_ON(adjusted_mode->crtc_clock == 0))
 		return 0;
-	if (WARN_ON(intel_state->cdclk == 0))
+	if (WARN_ON(intel_state->cdclk.logical.cdclk == 0))
 		return 0;
 
 	/* The WM are computed with base on how long it takes to fill a single
@@ -2104,7 +2104,7 @@ hsw_compute_linetime_wm(const struct intel_crtc_state *cstate)
 	linetime = DIV_ROUND_CLOSEST(adjusted_mode->crtc_htotal * 1000 * 8,
 				     adjusted_mode->crtc_clock);
 	ips_linetime = DIV_ROUND_CLOSEST(adjusted_mode->crtc_htotal * 1000 * 8,
-					 intel_state->cdclk);
+					 intel_state->cdclk.logical.cdclk);
 
 	return PIPE_WM_LINETIME_IPS_LINETIME(ips_linetime) |
 	       PIPE_WM_LINETIME_TIME(linetime);
-- 
2.10.2

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