drm/i915: Implement async flips for bdw

Implement async flip support for BDW. The implementation is
similar to the skl+ code. And just like skl/bxt/glk bdw also
needs the disable w/a, thus we need to plumb the desired state
of the async flip all the way down to i9xx_plane_ctl_crtc().

According to the spec we do need to bump the surface alignment
to 256KiB for this. Async flips require an X-tiled buffer so
we don't have to worry about linear.

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/20210111163711.12913-9-ville.syrjala@linux.intel.com
Reviewed-by: Karthik B S <karthik.b.s@intel.com>

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

@@ -495,6 +495,50 @@ static void i9xx_disable_plane(struct intel_plane *plane,
 	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 }
 
+static void
+g4x_primary_async_flip(struct intel_plane *plane,
+		       const struct intel_crtc_state *crtc_state,
+		       const struct intel_plane_state *plane_state,
+		       bool async_flip)
+{
+	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
+	u32 dspcntr = plane_state->ctl | i9xx_plane_ctl_crtc(crtc_state);
+	u32 dspaddr_offset = plane_state->color_plane[0].offset;
+	enum i9xx_plane_id i9xx_plane = plane->i9xx_plane;
+	unsigned long irqflags;
+
+	if (async_flip)
+		dspcntr |= DISPPLANE_ASYNC_FLIP;
+
+	spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
+	intel_de_write_fw(dev_priv, DSPCNTR(i9xx_plane), dspcntr);
+	intel_de_write_fw(dev_priv, DSPSURF(i9xx_plane),
+			  intel_plane_ggtt_offset(plane_state) + dspaddr_offset);
+	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
+}
+
+static void
+bdw_primary_enable_flip_done(struct intel_plane *plane)
+{
+	struct drm_i915_private *i915 = to_i915(plane->base.dev);
+	enum pipe pipe = plane->pipe;
+
+	spin_lock_irq(&i915->irq_lock);
+	bdw_enable_pipe_irq(i915, pipe, GEN8_PIPE_PRIMARY_FLIP_DONE);
+	spin_unlock_irq(&i915->irq_lock);
+}
+
+static void
+bdw_primary_disable_flip_done(struct intel_plane *plane)
+{
+	struct drm_i915_private *i915 = to_i915(plane->base.dev);
+	enum pipe pipe = plane->pipe;
+
+	spin_lock_irq(&i915->irq_lock);
+	bdw_disable_pipe_irq(i915, pipe, GEN8_PIPE_PRIMARY_FLIP_DONE);
+	spin_unlock_irq(&i915->irq_lock);
+}
+
 static bool i9xx_plane_get_hw_state(struct intel_plane *plane,
 				    enum pipe *pipe)
 {
@@ -708,6 +752,13 @@ intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
 	plane->get_hw_state = i9xx_plane_get_hw_state;
 	plane->check_plane = i9xx_plane_check;
 
+	if (IS_BROADWELL(dev_priv)) {
+		plane->need_async_flip_disable_wa = true;
+		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;
+	}
+
 	if (INTEL_GEN(dev_priv) >= 5 || IS_G4X(dev_priv))
 		ret = drm_universal_plane_init(&dev_priv->drm, &plane->base,
 					       0, plane_funcs,

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

@@ -1317,6 +1317,11 @@ static unsigned int intel_linear_alignment(const struct drm_i915_private *dev_pr
 		return 0;
 }
 
+static bool has_async_flips(struct drm_i915_private *i915)
+{
+	return INTEL_GEN(i915) >= 9 || IS_BROADWELL(i915);
+}
+
 static unsigned int intel_surf_alignment(const struct drm_framebuffer *fb,
 					 int color_plane)
 {
@@ -1331,7 +1336,7 @@ static unsigned int intel_surf_alignment(const struct drm_framebuffer *fb,
 	case DRM_FORMAT_MOD_LINEAR:
 		return intel_linear_alignment(dev_priv);
 	case I915_FORMAT_MOD_X_TILED:
-		if (INTEL_GEN(dev_priv) >= 9)
+		if (has_async_flips(dev_priv))
 			return 256 * 1024;
 		return 0;
 	case I915_FORMAT_MOD_Y_TILED_GEN12_MC_CCS:
@@ -14784,8 +14789,7 @@ static void intel_mode_config_init(struct drm_i915_private *i915)
 
 	mode_config->funcs = &intel_mode_funcs;
 
-	if (INTEL_GEN(i915) >= 9)
-		mode_config->async_page_flip = true;
+	mode_config->async_page_flip = has_async_flips(i915);
 
 	/*
 	 * Maximum framebuffer dimensions, chosen to match

drivers/gpu/drm/i915/i915_irq.c

@@ -2380,6 +2380,14 @@ static void gen11_dsi_te_interrupt_handler(struct drm_i915_private *dev_priv,
 	intel_uncore_write(&dev_priv->uncore, DSI_INTR_IDENT_REG(port), tmp);
 }
 
+static u32 gen8_de_pipe_flip_done_mask(struct drm_i915_private *i915)
+{
+	if (INTEL_GEN(i915) >= 9)
+		return GEN9_PIPE_PLANE1_FLIP_DONE;
+	else
+		return GEN8_PIPE_PRIMARY_FLIP_DONE;
+}
+
 static irqreturn_t
 gen8_de_irq_handler(struct drm_i915_private *dev_priv, u32 master_ctl)
 {
@@ -2482,7 +2490,7 @@ gen8_de_irq_handler(struct drm_i915_private *dev_priv, u32 master_ctl)
 		if (iir & GEN8_PIPE_VBLANK)
 			intel_handle_vblank(dev_priv, pipe);
 
-		if (iir & GEN9_PIPE_PLANE1_FLIP_DONE)
+		if (iir & gen8_de_pipe_flip_done_mask(dev_priv))
 			flip_done_handler(dev_priv, pipe);
 
 		if (iir & GEN8_PIPE_CDCLK_CRC_DONE)
@@ -3101,13 +3109,10 @@ void gen8_irq_power_well_post_enable(struct drm_i915_private *dev_priv,
 				     u8 pipe_mask)
 {
 	struct intel_uncore *uncore = &dev_priv->uncore;
-
-	u32 extra_ier = GEN8_PIPE_VBLANK | GEN8_PIPE_FIFO_UNDERRUN;
+	u32 extra_ier = GEN8_PIPE_VBLANK | GEN8_PIPE_FIFO_UNDERRUN |
+		gen8_de_pipe_flip_done_mask(dev_priv);
 	enum pipe pipe;
 
-	if (INTEL_GEN(dev_priv) >= 9)
-		extra_ier |= GEN9_PIPE_PLANE1_FLIP_DONE;
-
 	spin_lock_irq(&dev_priv->irq_lock);
 
 	if (!intel_irqs_enabled(dev_priv)) {
@@ -3679,11 +3684,9 @@ static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
 			de_port_masked |= DSI0_TE | DSI1_TE;
 	}
 
-	de_pipe_enables = de_pipe_masked | GEN8_PIPE_VBLANK |
-					   GEN8_PIPE_FIFO_UNDERRUN;
-
-	if (INTEL_GEN(dev_priv) >= 9)
-		de_pipe_enables |= GEN9_PIPE_PLANE1_FLIP_DONE;
+	de_pipe_enables = de_pipe_masked |
+		GEN8_PIPE_VBLANK | GEN8_PIPE_FIFO_UNDERRUN |
+		gen8_de_pipe_flip_done_mask(dev_priv);
 
 	de_port_enables = de_port_masked;
 	if (IS_GEN9_LP(dev_priv))

drivers/gpu/drm/i915/i915_reg.h

@@ -6614,6 +6614,7 @@ enum {
 #define   DISPPLANE_ROTATE_180			(1 << 15)
 #define   DISPPLANE_TRICKLE_FEED_DISABLE	(1 << 14) /* Ironlake */
 #define   DISPPLANE_TILED			(1 << 10)
+#define   DISPPLANE_ASYNC_FLIP			(1 << 9) /* g4x+ */
 #define   DISPPLANE_MIRROR			(1 << 8) /* CHV pipe B */
 #define _DSPAADDR				0x70184
 #define _DSPASTRIDE				0x70188