[PATCH v3 13/14] drm/i915: Replace the .modeset_commit_cdclk() hook with a more direct .set_cdclk() hook

[ville.syrjala@linux.intel.com]

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

With the cdclk state, all the .modeset_commit_cdclk() hooks are
now pointless wrappers. Let's replace them with just a .set_cdclk()
function pointer. However let's wrap that in a small helper that
does the state comparison and prints a unified debug message across
all platforms. We didn't even have the debug print on all platforms
previously. This reduces the clutter in intel_atomic_commit_tail() a
little bit.

v2: Wrap .set_cdclk() in intel_set_cdclk()
v3: Add kernel-docs

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ander Conselvan de Oliveira <conselvan2@gmail.com>
---
 drivers/gpu/drm/i915/i915_drv.h      |  3 +-
 drivers/gpu/drm/i915/intel_cdclk.c   | 79 +++++++++++++++---------------------
 drivers/gpu/drm/i915/intel_display.c |  5 +--
 drivers/gpu/drm/i915/intel_drv.h     |  2 +
 4 files changed, 38 insertions(+), 51 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 41bde80d5822..9ce797b708f9 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -605,6 +605,8 @@ struct intel_cdclk_state;
 struct drm_i915_display_funcs {
 	void (*get_cdclk)(struct drm_i915_private *dev_priv,
 			  struct intel_cdclk_state *cdclk_state);
+	void (*set_cdclk)(struct drm_i915_private *dev_priv,
+			  const struct intel_cdclk_state *cdclk_state);
 	int (*get_fifo_size)(struct drm_i915_private *dev_priv, int plane);
 	int (*compute_pipe_wm)(struct intel_crtc_state *cstate);
 	int (*compute_intermediate_wm)(struct drm_device *dev,
@@ -619,7 +621,6 @@ struct drm_i915_display_funcs {
 	int (*compute_global_watermarks)(struct drm_atomic_state *state);
 	void (*update_wm)(struct intel_crtc *crtc);
 	int (*modeset_calc_cdclk)(struct drm_atomic_state *state);
-	void (*modeset_commit_cdclk)(struct drm_atomic_state *state);
 	/* Returns the active state of the crtc, and if the crtc is active,
 	 * fills out the pipe-config with the hw state. */
 	bool (*get_pipe_config)(struct intel_crtc *,
diff --git a/drivers/gpu/drm/i915/intel_cdclk.c b/drivers/gpu/drm/i915/intel_cdclk.c
index 901b72eae624..94985db6e4e9 100644
--- a/drivers/gpu/drm/i915/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/intel_cdclk.c
@@ -883,9 +883,6 @@ static void skl_set_cdclk(struct drm_i915_private *dev_priv,
 
 	WARN_ON((cdclk == 24000) != (vco == 0));
 
-	DRM_DEBUG_DRIVER("Changing CDCLK to %d kHz (VCO %d kHz)\n",
-			 cdclk, vco);
-
 	mutex_lock(&dev_priv->rps.hw_lock);
 	ret = skl_pcode_request(dev_priv, SKL_PCODE_CDCLK_CONTROL,
 				SKL_CDCLK_PREPARE_FOR_CHANGE,
@@ -1202,9 +1199,6 @@ static void bxt_set_cdclk(struct drm_i915_private *dev_priv,
 	u32 val, divider;
 	int ret;
 
-	DRM_DEBUG_DRIVER("Changing CDCLK to %d kHz (VCO %d kHz)\n",
-			 cdclk, vco);
-
 	/* cdclk = vco / 2 / div{1,1.5,2,4} */
 	switch (DIV_ROUND_CLOSEST(vco, cdclk)) {
 	case 8:
@@ -1390,6 +1384,30 @@ bool intel_cdclk_state_compare(const struct intel_cdclk_state *a,
 	return memcmp(a, b, sizeof(*a)) == 0;
 }
 
+/**
+ * intel_set_cdclk - Push the CDCLK state to the hardware
+ * @dev_priv: i915 device
+ * @cdclk_state: new CDCLK state
+ *
+ * Program the hardware based on the passed in CDCLK state,
+ * if necessary.
+ */
+void intel_set_cdclk(struct drm_i915_private *dev_priv,
+		     const struct intel_cdclk_state *cdclk_state)
+{
+	if (intel_cdclk_state_compare(&dev_priv->cdclk.hw, cdclk_state))
+		return;
+
+	if (WARN_ON_ONCE(!dev_priv->display.set_cdclk))
+		return;
+
+	DRM_DEBUG_DRIVER("Changing CDCLK to %d kHz, VCO %d kHz, ref %d kHz\n",
+			 cdclk_state->cdclk, cdclk_state->vco,
+			 cdclk_state->ref);
+
+	dev_priv->display.set_cdclk(dev_priv, cdclk_state);
+}
+
 static int bdw_adjust_min_pipe_pixel_rate(struct intel_crtc_state *crtc_state,
 					  int pixel_rate)
 {
@@ -1484,16 +1502,6 @@ static int vlv_modeset_calc_cdclk(struct drm_atomic_state *state)
 	return 0;
 }
 
-static void vlv_modeset_commit_cdclk(struct drm_atomic_state *old_state)
-{
-	struct drm_i915_private *dev_priv = to_i915(old_state->dev);
-
-	if (IS_CHERRYVIEW(dev_priv))
-		chv_set_cdclk(dev_priv, &dev_priv->cdclk.actual);
-	else
-		vlv_set_cdclk(dev_priv, &dev_priv->cdclk.actual);
-}
-
 static int bdw_modeset_calc_cdclk(struct drm_atomic_state *state)
 {
 	struct drm_i915_private *dev_priv = to_i915(state->dev);
@@ -1527,13 +1535,6 @@ static int bdw_modeset_calc_cdclk(struct drm_atomic_state *state)
 	return 0;
 }
 
-static void bdw_modeset_commit_cdclk(struct drm_atomic_state *old_state)
-{
-	struct drm_i915_private *dev_priv = to_i915(old_state->dev);
-
-	bdw_set_cdclk(dev_priv, &dev_priv->cdclk.actual);
-}
-
 static int skl_modeset_calc_cdclk(struct drm_atomic_state *state)
 {
 	struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
@@ -1573,13 +1574,6 @@ static int skl_modeset_calc_cdclk(struct drm_atomic_state *state)
 	return 0;
 }
 
-static void skl_modeset_commit_cdclk(struct drm_atomic_state *old_state)
-{
-	struct drm_i915_private *dev_priv = to_i915(old_state->dev);
-
-	skl_set_cdclk(dev_priv, &dev_priv->cdclk.actual);
-}
-
 static int bxt_modeset_calc_cdclk(struct drm_atomic_state *state)
 {
 	struct drm_i915_private *dev_priv = to_i915(state->dev);
@@ -1624,13 +1618,6 @@ static int bxt_modeset_calc_cdclk(struct drm_atomic_state *state)
 	return 0;
 }
 
-static void bxt_modeset_commit_cdclk(struct drm_atomic_state *old_state)
-{
-	struct drm_i915_private *dev_priv = to_i915(old_state->dev);
-
-	bxt_set_cdclk(dev_priv, &dev_priv->cdclk.actual);
-}
-
 static int intel_compute_max_dotclk(struct drm_i915_private *dev_priv)
 {
 	int max_cdclk_freq = dev_priv->max_cdclk_freq;
@@ -1810,24 +1797,24 @@ void intel_update_rawclk(struct drm_i915_private *dev_priv)
  */
 void intel_init_cdclk_hooks(struct drm_i915_private *dev_priv)
 {
-	if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
-		dev_priv->display.modeset_commit_cdclk =
-			vlv_modeset_commit_cdclk;
+	if (IS_CHERRYVIEW(dev_priv)) {
+		dev_priv->display.set_cdclk = chv_set_cdclk;
+		dev_priv->display.modeset_calc_cdclk =
+			vlv_modeset_calc_cdclk;
+	} else if (IS_VALLEYVIEW(dev_priv)) {
+		dev_priv->display.set_cdclk = vlv_set_cdclk;
 		dev_priv->display.modeset_calc_cdclk =
 			vlv_modeset_calc_cdclk;
 	} else if (IS_BROADWELL(dev_priv)) {
-		dev_priv->display.modeset_commit_cdclk =
-			bdw_modeset_commit_cdclk;
+		dev_priv->display.set_cdclk = bdw_set_cdclk;
 		dev_priv->display.modeset_calc_cdclk =
 			bdw_modeset_calc_cdclk;
 	} else if (IS_GEN9_LP(dev_priv)) {
-		dev_priv->display.modeset_commit_cdclk =
-			bxt_modeset_commit_cdclk;
+		dev_priv->display.set_cdclk = bxt_set_cdclk;
 		dev_priv->display.modeset_calc_cdclk =
 			bxt_modeset_calc_cdclk;
 	} else if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv)) {
-		dev_priv->display.modeset_commit_cdclk =
-			skl_modeset_commit_cdclk;
+		dev_priv->display.set_cdclk = skl_set_cdclk;
 		dev_priv->display.modeset_calc_cdclk =
 			skl_modeset_calc_cdclk;
 	}
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 6333f1a74166..d4c72d19118f 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -12826,10 +12826,7 @@ static void intel_atomic_commit_tail(struct drm_atomic_state *state)
 	if (intel_state->modeset) {
 		drm_atomic_helper_update_legacy_modeset_state(state->dev, state);
 
-		if (dev_priv->display.modeset_commit_cdclk &&
-		    !intel_cdclk_state_compare(&dev_priv->cdclk.hw,
-					       &dev_priv->cdclk.actual))
-			dev_priv->display.modeset_commit_cdclk(state);
+		intel_set_cdclk(dev_priv, &dev_priv->cdclk.actual);
 
 		/*
 		 * SKL workaround: bspec recommends we disable the SAGV when we
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index a8f01d44bbfe..3f411d40d1eb 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1243,6 +1243,8 @@ void intel_update_cdclk(struct drm_i915_private *dev_priv);
 void intel_update_rawclk(struct drm_i915_private *dev_priv);
 bool intel_cdclk_state_compare(const struct intel_cdclk_state *a,
 			       const struct intel_cdclk_state *b);
+void intel_set_cdclk(struct drm_i915_private *dev_priv,
+		     const struct intel_cdclk_state *cdclk_state);
 
 /* intel_display.c */
 enum transcoder intel_crtc_pch_transcoder(struct intel_crtc *crtc);
-- 
2.10.2

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