drm/i915/fbc: Introduce intel_fbc_set_false_color()

Pull the direct FBC register frobbing out from the debugfs code
into the fbc code. Also add a vfunc for this so we don't need
extra platforms checks.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211104144520.22605-11-ville.syrjala@linux.intel.comAcked-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Mika Kahola <mika.kahola@intel.com>

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

@@ -70,9 +70,6 @@ static int i915_fbc_false_color_get(void *data, u64 *val)
 {
 	struct drm_i915_private *dev_priv = data;
 
-	if (DISPLAY_VER(dev_priv) < 7 || !HAS_FBC(dev_priv))
-		return -ENODEV;
-
 	*val = dev_priv->fbc.false_color;
 
 	return 0;
@@ -81,21 +78,8 @@ static int i915_fbc_false_color_get(void *data, u64 *val)
 static int i915_fbc_false_color_set(void *data, u64 val)
 {
 	struct drm_i915_private *dev_priv = data;
-	u32 reg;
-
-	if (DISPLAY_VER(dev_priv) < 7 || !HAS_FBC(dev_priv))
-		return -ENODEV;
 
-	mutex_lock(&dev_priv->fbc.lock);
-
-	reg = intel_de_read(dev_priv, ILK_DPFC_CONTROL);
-	dev_priv->fbc.false_color = val;
-
-	intel_de_write(dev_priv, ILK_DPFC_CONTROL,
-		       val ? (reg | FBC_CTL_FALSE_COLOR) : (reg & ~FBC_CTL_FALSE_COLOR));
-
-	mutex_unlock(&dev_priv->fbc.lock);
-	return 0;
+	return intel_fbc_set_false_color(dev_priv, val);
 }
 
 DEFINE_SIMPLE_ATTRIBUTE(i915_fbc_false_color_fops,

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

@@ -55,6 +55,7 @@ struct intel_fbc_funcs {
 	bool (*is_compressing)(struct drm_i915_private *i915);
 	void (*nuke)(struct drm_i915_private *i915);
 	void (*program_cfb)(struct drm_i915_private *i915);
+	void (*set_false_color)(struct drm_i915_private *i915, bool enable);
 };
 
 /*
@@ -538,6 +539,13 @@ static bool ivb_fbc_is_compressing(struct drm_i915_private *i915)
 		return intel_de_read(i915, IVB_FBC_STATUS2) & IVB_FBC_COMP_SEG_MASK;
 }
 
+static void ivb_fbc_set_false_color(struct drm_i915_private *i915,
+				    bool enable)
+{
+	intel_de_rmw(i915, ILK_DPFC_CONTROL,
+		     FBC_CTL_FALSE_COLOR, enable ? FBC_CTL_FALSE_COLOR : 0);
+}
+
 static const struct intel_fbc_funcs ivb_fbc_funcs = {
 	.activate = ivb_fbc_activate,
 	.deactivate = ilk_fbc_deactivate,
@@ -545,6 +553,7 @@ static const struct intel_fbc_funcs ivb_fbc_funcs = {
 	.is_compressing = ivb_fbc_is_compressing,
 	.nuke = snb_fbc_nuke,
 	.program_cfb = ilk_fbc_program_cfb,
+	.set_false_color = ivb_fbc_set_false_color,
 };
 
 static bool intel_fbc_hw_is_active(struct drm_i915_private *dev_priv)
@@ -593,6 +602,24 @@ static void intel_fbc_nuke(struct drm_i915_private *i915)
 	fbc->funcs->nuke(i915);
 }
 
+int intel_fbc_set_false_color(struct drm_i915_private *i915, bool enable)
+{
+	struct intel_fbc *fbc = &i915->fbc;
+
+	if (!fbc->funcs || !fbc->funcs->set_false_color)
+		return -ENODEV;
+
+	mutex_lock(&fbc->lock);
+
+	fbc->false_color = enable;
+
+	fbc->funcs->set_false_color(i915, enable);
+
+	mutex_unlock(&fbc->lock);
+
+	return 0;
+}
+
 /**
  * intel_fbc_is_active - Is FBC active?
  * @dev_priv: i915 device instance

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

@@ -37,5 +37,7 @@ void intel_fbc_flush(struct drm_i915_private *dev_priv,
 void intel_fbc_cleanup_cfb(struct drm_i915_private *dev_priv);
 void intel_fbc_handle_fifo_underrun_irq(struct drm_i915_private *dev_priv);
 int intel_fbc_reset_underrun(struct drm_i915_private *dev_priv);
+int intel_fbc_set_false_color(struct drm_i915_private *i915,
+			      bool enable);
 
 #endif /* __INTEL_FBC_H__ */