[Intel-gfx] [PATCH 3/6] drm/i915: Clean up fbc vs. plane checks

[Ville Syrjala]

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

Let's record the information whether a plane can do fbc or not under
struct inte_plane.

v2: Rebase due to i9xx_plane_id
    Handle BDW/HSW correctly

Cc: Chris Wilson <chris at chris-wilson.co.uk>
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 37 ++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_drv.h     |  1 +
 drivers/gpu/drm/i915/intel_fbc.c     | 28 +++++++--------------------
 drivers/gpu/drm/i915/intel_pm.c      |  2 --
 4 files changed, 45 insertions(+), 23 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index d2a66704e6f5..8aeb6b686bac 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13238,6 +13238,32 @@ static const struct drm_plane_funcs intel_cursor_plane_funcs = {
 	.format_mod_supported = intel_cursor_plane_format_mod_supported,
 };
 
+static bool i9xx_plane_has_fbc(struct drm_i915_private *dev_priv,
+			       enum i9xx_plane_id i9xx_plane)
+{
+	if (!HAS_FBC(dev_priv))
+		return false;
+
+	if (IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv))
+		return i9xx_plane == PLANE_A;
+	else if (IS_IVYBRIDGE(dev_priv))
+		return i9xx_plane == PLANE_A || i9xx_plane == PLANE_B ||
+			i9xx_plane == PLANE_C;
+	else if (INTEL_GEN(dev_priv) >= 4)
+		return i9xx_plane == PLANE_A || i9xx_plane == PLANE_B;
+	else
+		return i9xx_plane == PLANE_A;
+}
+
+static bool skl_plane_has_fbc(struct drm_i915_private *dev_priv,
+			      enum pipe pipe, enum plane_id plane_id)
+{
+	if (!HAS_FBC(dev_priv))
+		return false;
+
+	return pipe == PIPE_A && plane_id == PLANE_PRIMARY;
+}
+
 static struct intel_plane *
 intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
 {
@@ -13280,6 +13306,15 @@ intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
 		primary->i9xx_plane = (enum i9xx_plane_id) pipe;
 	primary->id = PLANE_PRIMARY;
 	primary->frontbuffer_bit = INTEL_FRONTBUFFER(pipe, primary->id);
+
+	if (INTEL_GEN(dev_priv) >= 9)
+		primary->has_fbc = skl_plane_has_fbc(dev_priv,
+						     primary->pipe,
+						     primary->id);
+	else
+		primary->has_fbc = i9xx_plane_has_fbc(dev_priv,
+						      primary->i9xx_plane);
+
 	primary->check_plane = intel_check_primary_plane;
 
 	if (INTEL_GEN(dev_priv) >= 9) {
@@ -14683,6 +14718,8 @@ int intel_modeset_init(struct drm_device *dev)
 		}
 	}
 
+	intel_fbc_init(dev_priv);
+
 	intel_shared_dpll_init(dev);
 	intel_update_fdi_pll_freq(dev_priv);
 
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index e3f78fdae859..af82feb4a3cd 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -935,6 +935,7 @@ struct intel_plane {
 	enum plane_id id;
 	enum pipe pipe;
 	bool can_scale;
+	bool has_fbc;
 	int max_downscale;
 	uint32_t frontbuffer_bit;
 
diff --git a/drivers/gpu/drm/i915/intel_fbc.c b/drivers/gpu/drm/i915/intel_fbc.c
index f66f6fb5743d..97d088058d1d 100644
--- a/drivers/gpu/drm/i915/intel_fbc.c
+++ b/drivers/gpu/drm/i915/intel_fbc.c
@@ -46,16 +46,6 @@ static inline bool fbc_supported(struct drm_i915_private *dev_priv)
 	return HAS_FBC(dev_priv);
 }
 
-static inline bool fbc_on_pipe_a_only(struct drm_i915_private *dev_priv)
-{
-	return IS_HASWELL(dev_priv) || INTEL_GEN(dev_priv) >= 8;
-}
-
-static inline bool fbc_on_plane_a_only(struct drm_i915_private *dev_priv)
-{
-	return INTEL_GEN(dev_priv) < 4;
-}
-
 static inline bool no_fbc_on_multiple_pipes(struct drm_i915_private *dev_priv)
 {
 	return INTEL_GEN(dev_priv) <= 3;
@@ -1094,13 +1084,10 @@ void intel_fbc_choose_crtc(struct drm_i915_private *dev_priv,
 		struct intel_crtc_state *crtc_state;
 		struct intel_crtc *crtc = to_intel_crtc(plane_state->base.crtc);
 
-		if (!plane_state->base.visible)
-			continue;
-
-		if (fbc_on_pipe_a_only(dev_priv) && crtc->pipe != PIPE_A)
+		if (!plane->has_fbc)
 			continue;
 
-		if (fbc_on_plane_a_only(dev_priv) && plane->i9xx_plane != PLANE_A)
+		if (!plane_state->base.visible)
 			continue;
 
 		crtc_state = intel_atomic_get_new_crtc_state(state, crtc);
@@ -1357,7 +1344,7 @@ static bool need_fbc_vtd_wa(struct drm_i915_private *dev_priv)
 void intel_fbc_init(struct drm_i915_private *dev_priv)
 {
 	struct intel_fbc *fbc = &dev_priv->fbc;
-	enum pipe pipe;
+	struct intel_plane *plane;
 
 	INIT_WORK(&fbc->work.work, intel_fbc_work_fn);
 	INIT_WORK(&fbc->underrun_work, intel_fbc_underrun_work_fn);
@@ -1378,12 +1365,11 @@ void intel_fbc_init(struct drm_i915_private *dev_priv)
 		return;
 	}
 
-	for_each_pipe(dev_priv, pipe) {
-		fbc->possible_framebuffer_bits |=
-			INTEL_FRONTBUFFER(pipe, PLANE_PRIMARY);
 
-		if (fbc_on_pipe_a_only(dev_priv))
-			break;
+	for_each_intel_plane(&dev_priv->drm, plane) {
+		if (plane->has_fbc)
+			fbc->possible_framebuffer_bits |=
+				INTEL_FRONTBUFFER(plane->pipe, plane->id);
 	}
 
 	/* This value was pulled out of someone's hat */
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index abf80e462833..e8180ff66f43 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -9049,8 +9049,6 @@ void intel_init_clock_gating_hooks(struct drm_i915_private *dev_priv)
 /* Set up chip specific power management-related functions */
 void intel_init_pm(struct drm_i915_private *dev_priv)
 {
-	intel_fbc_init(dev_priv);
-
 	/* For cxsr */
 	if (IS_PINEVIEW(dev_priv))
 		i915_pineview_get_mem_freq(dev_priv);
-- 
2.13.6