drm/i915: Implement async flip for ivb/hsw

Add support for async flips on ivb/hsw. Unlike bdw+ we don't need
any workarounds to disable async flips. Apart from that the only
real difference from the bdw implementation is the location of the
flip_done interrupt bits.

Cc: Karthik B S <karthik.b.s@intel.com>
Cc: Vandita Kulkarni <vandita.kulkarni@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210111163711.12913-10-ville.syrjala@linux.intel.comReviewed-by: Karthik B S <karthik.b.s@intel.com>

drivers/gpu/drm/i915/display/i9xx_plane.c

@@ -539,6 +539,26 @@ bdw_primary_disable_flip_done(struct intel_plane *plane)
 	spin_unlock_irq(&i915->irq_lock);
 }
 
+static void
+ivb_primary_enable_flip_done(struct intel_plane *plane)
+{
+	struct drm_i915_private *i915 = to_i915(plane->base.dev);
+
+	spin_lock_irq(&i915->irq_lock);
+	ilk_enable_display_irq(i915, DE_PLANE_FLIP_DONE_IVB(plane->i9xx_plane));
+	spin_unlock_irq(&i915->irq_lock);
+}
+
+static void
+ivb_primary_disable_flip_done(struct intel_plane *plane)
+{
+	struct drm_i915_private *i915 = to_i915(plane->base.dev);
+
+	spin_lock_irq(&i915->irq_lock);
+	ilk_disable_display_irq(i915, DE_PLANE_FLIP_DONE_IVB(plane->i9xx_plane));
+	spin_unlock_irq(&i915->irq_lock);
+}
+
 static bool i9xx_plane_get_hw_state(struct intel_plane *plane,
 				    enum pipe *pipe)
 {
@@ -757,6 +777,10 @@ intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
 		plane->async_flip = g4x_primary_async_flip;
 		plane->enable_flip_done = bdw_primary_enable_flip_done;
 		plane->disable_flip_done = bdw_primary_disable_flip_done;
+	} else if (IS_HASWELL(dev_priv) || IS_IVYBRIDGE(dev_priv)) {
+		plane->async_flip = g4x_primary_async_flip;
+		plane->enable_flip_done = ivb_primary_enable_flip_done;
+		plane->disable_flip_done = ivb_primary_disable_flip_done;
 	}
 
 	if (INTEL_GEN(dev_priv) >= 5 || IS_G4X(dev_priv))

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

@@ -1319,7 +1319,8 @@ static unsigned int intel_linear_alignment(const struct drm_i915_private *dev_pr
 
 static bool has_async_flips(struct drm_i915_private *i915)
 {
-	return INTEL_GEN(i915) >= 9 || IS_BROADWELL(i915);
+	return INTEL_GEN(i915) >= 9 || IS_BROADWELL(i915) ||
+		IS_HASWELL(i915) || IS_IVYBRIDGE(i915);
 }
 
 static unsigned int intel_surf_alignment(const struct drm_framebuffer *fb,

drivers/gpu/drm/i915/i915_irq.c

@@ -2104,6 +2104,9 @@ static void ivb_display_irq_handler(struct drm_i915_private *dev_priv,
 	for_each_pipe(dev_priv, pipe) {
 		if (de_iir & DE_PIPE_VBLANK_IVB(pipe))
 			intel_handle_vblank(dev_priv, pipe);
+
+		if (de_iir & DE_PLANE_FLIP_DONE_IVB(pipe))
+			flip_done_handler(dev_priv, pipe);
 	}
 
 	/* check event from PCH */
@@ -3587,6 +3590,9 @@ static void ilk_irq_postinstall(struct drm_i915_private *dev_priv)
 				DE_PCH_EVENT_IVB | DE_AUX_CHANNEL_A_IVB);
 		extra_mask = (DE_PIPEC_VBLANK_IVB | DE_PIPEB_VBLANK_IVB |
 			      DE_PIPEA_VBLANK_IVB | DE_ERR_INT_IVB |
+			      DE_PLANE_FLIP_DONE_IVB(PLANE_C) |
+			      DE_PLANE_FLIP_DONE_IVB(PLANE_B) |
+			      DE_PLANE_FLIP_DONE_IVB(PLANE_A) |
 			      DE_DP_A_HOTPLUG_IVB);
 	} else {
 		display_mask = (DE_MASTER_IRQ_CONTROL | DE_GSE | DE_PCH_EVENT |