[PATCH 7/8] drm/i915: Split plane hw and uapi state, v2.

[Maarten Lankhorst]

Splitting plane state is easier than splitting crtc_state,
before plane check we copy the drm properties to hw so we can
do the same in bigjoiner later on.

We copy the state after we did all the modeset handling, but fortunately
i915 seems to be split correctly and nothing during modeset looks
at plane_state.

Changes since v1:
- Do not clear hw state on duplication.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
 .../gpu/drm/i915/display/intel_atomic_plane.c | 40 ++++++++++++++++++-
 .../gpu/drm/i915/display/intel_atomic_plane.h |  2 +
 drivers/gpu/drm/i915/display/intel_display.c  |  1 +
 .../drm/i915/display/intel_display_types.h    | 22 ++++++++--
 4 files changed, 60 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_atomic_plane.c b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
index 01937896d69c..f42e901060e3 100644
--- a/drivers/gpu/drm/i915/display/intel_atomic_plane.c
+++ b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
@@ -93,6 +93,10 @@ intel_plane_duplicate_state(struct drm_plane *plane)
 	intel_state->vma = NULL;
 	intel_state->flags = 0;
 
+	/* add reference to fb */
+	if (intel_state->hw.fb)
+		drm_framebuffer_get(intel_state->hw.fb);
+
 	return &intel_state->uapi;
 }
 
@@ -112,6 +116,8 @@ intel_plane_destroy_state(struct drm_plane *plane,
 	WARN_ON(plane_state->vma);
 
 	__drm_atomic_helper_plane_destroy_state(&plane_state->uapi);
+	if (plane_state->hw.fb)
+		drm_framebuffer_put(plane_state->hw.fb);
 	kfree(plane_state);
 }
 
@@ -138,15 +144,44 @@ unsigned int intel_plane_data_rate(const struct intel_crtc_state *crtc_state,
 	return cpp * crtc_state->pixel_rate;
 }
 
+static void intel_plane_clear_hw_state(struct intel_plane_state *plane_state)
+{
+	if (plane_state->hw.fb)
+		drm_framebuffer_put(plane_state->hw.fb);
+
+	memset(&plane_state->hw, 0, sizeof(plane_state->hw));
+}
+
+void intel_plane_copy_uapi_to_hw_state(struct intel_plane_state *plane_state,
+				       const struct intel_plane_state *from_plane_state)
+{
+	intel_plane_clear_hw_state(plane_state);
+
+	plane_state->hw.crtc = from_plane_state->uapi.crtc;
+	plane_state->hw.fb = from_plane_state->uapi.fb;
+	if (plane_state->hw.fb)
+		drm_framebuffer_get(plane_state->hw.fb);
+
+	plane_state->hw.alpha = from_plane_state->uapi.alpha;
+	plane_state->hw.pixel_blend_mode =
+		from_plane_state->uapi.pixel_blend_mode;
+	plane_state->hw.rotation = from_plane_state->uapi.rotation;
+	plane_state->hw.color_encoding = from_plane_state->uapi.color_encoding;
+	plane_state->hw.color_range = from_plane_state->uapi.color_range;
+}
+
 int intel_plane_atomic_check_with_state(const struct intel_crtc_state *old_crtc_state,
 					struct intel_crtc_state *new_crtc_state,
 					const struct intel_plane_state *old_plane_state,
 					struct intel_plane_state *new_plane_state)
 {
 	struct intel_plane *plane = to_intel_plane(new_plane_state->uapi.plane);
-	const struct drm_framebuffer *fb = new_plane_state->hw.fb;
+	const struct drm_framebuffer *fb;
 	int ret;
 
+	intel_plane_copy_uapi_to_hw_state(new_plane_state, new_plane_state);
+	fb = new_plane_state->hw.fb;
+
 	new_crtc_state->active_planes &= ~BIT(plane->id);
 	new_crtc_state->nv12_planes &= ~BIT(plane->id);
 	new_crtc_state->c8_planes &= ~BIT(plane->id);
@@ -373,6 +408,7 @@ intel_atomic_get_plane_state_after_check(struct intel_atomic_state *state,
 {
 	struct intel_plane_state *plane_state =
 		intel_atomic_get_new_plane_state(state, plane);
+	const struct intel_plane_state *old_plane_state;
 
 	if (plane_state)
 		return plane_state;
@@ -381,6 +417,8 @@ intel_atomic_get_plane_state_after_check(struct intel_atomic_state *state,
 	if (IS_ERR(plane_state))
 		return plane_state;
 
+	old_plane_state = intel_atomic_get_old_plane_state(state, plane);
+
 	new_crtc_state->update_planes |= BIT(plane->id);
 	return plane_state;
 }
diff --git a/drivers/gpu/drm/i915/display/intel_atomic_plane.h b/drivers/gpu/drm/i915/display/intel_atomic_plane.h
index cb7ef4f9eafd..fd4b96013454 100644
--- a/drivers/gpu/drm/i915/display/intel_atomic_plane.h
+++ b/drivers/gpu/drm/i915/display/intel_atomic_plane.h
@@ -20,6 +20,8 @@ extern const struct drm_plane_helper_funcs intel_plane_helper_funcs;
 
 unsigned int intel_plane_data_rate(const struct intel_crtc_state *crtc_state,
 				   const struct intel_plane_state *plane_state);
+void intel_plane_copy_uapi_to_hw_state(struct intel_plane_state *plane_state,
+				       const struct intel_plane_state *from_plane_state);
 void intel_update_plane(struct intel_plane *plane,
 			const struct intel_crtc_state *crtc_state,
 			const struct intel_plane_state *plane_state);
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 1add37e2c787..66c11ab0a64f 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -3260,6 +3260,7 @@ intel_find_initial_plane_obj(struct intel_crtc *intel_crtc,
 
 	plane_state->fb = fb;
 	plane_state->crtc = &intel_crtc->base;
+	intel_plane_copy_uapi_to_hw_state(intel_state, intel_state);
 
 	atomic_or(to_intel_plane(primary)->frontbuffer_bit,
 		  &to_intel_frontbuffer(fb)->bits);
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 03ec43c4ceab..5379b93c2fab 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -515,10 +515,24 @@ struct intel_atomic_state {
 };
 
 struct intel_plane_state {
-	union {
-		struct drm_plane_state uapi;
-		struct drm_plane_state hw;
-	};
+	struct drm_plane_state uapi;
+
+	/*
+	 * actual hardware state, the state we program to the hardware.
+	 * The following members are used to verify the hardware state:
+	 * During initial hw readout, they need to be copied from uapi.
+	 */
+	struct {
+		struct drm_crtc *crtc;
+		struct drm_framebuffer *fb;
+
+		u16 alpha;
+		uint16_t pixel_blend_mode;
+		unsigned int rotation;
+		enum drm_color_encoding color_encoding;
+		enum drm_color_range color_range;
+	} hw;
+
 	struct i915_ggtt_view view;
 	struct i915_vma *vma;
 	unsigned long flags;
-- 
2.23.0