drm/komeda: Add komeda_crtc_atomic_flush

A komeda flush is comprised two steps:
1. update pipeline/component state to HW.
2. call dev_func->flush to notify HW to kickoff the update.
Signed-off-by: James Qian Wang (Arm Technology China) <james.qian.wang@arm.com>
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>

drivers/gpu/drm/arm/display/komeda/d71/d71_dev.c

@@ -243,6 +243,16 @@ static int d71_disable_irq(struct komeda_dev *mdev)
 	return 0;
 }
 
+static void d71_flush(struct komeda_dev *mdev,
+		      int master_pipe, u32 active_pipes)
+{
+	struct d71_dev *d71 = mdev->chip_data;
+	u32 reg_offset = (master_pipe == 0) ?
+			 GCU_CONFIG_VALID0 : GCU_CONFIG_VALID1;
+
+	malidp_write32(d71->gcu_addr, reg_offset, GCU_CONFIG_CVAL);
+}
+
 static int d71_reset(struct d71_dev *d71)
 {
 	u32 __iomem *gcu = d71->gcu_addr;
@@ -459,6 +469,7 @@ static struct komeda_dev_funcs d71_chip_funcs = {
 	.irq_handler	= d71_irq_handler,
 	.enable_irq	= d71_enable_irq,
 	.disable_irq	= d71_disable_irq,
+	.flush		= d71_flush,
 };
 
 struct komeda_dev_funcs *

drivers/gpu/drm/arm/display/komeda/komeda_crtc.c

@@ -62,8 +62,41 @@ void komeda_crtc_handle_event(struct komeda_crtc   *kcrtc,
 		DRM_DEBUG("FLIP Done.\n");
 }
 
+static void
+komeda_crtc_do_flush(struct drm_crtc *crtc,
+		     struct drm_crtc_state *old)
+{
+	struct komeda_crtc *kcrtc = to_kcrtc(crtc);
+	struct komeda_crtc_state *kcrtc_st = to_kcrtc_st(crtc->state);
+	struct komeda_dev *mdev = kcrtc->base.dev->dev_private;
+	struct komeda_pipeline *master = kcrtc->master;
+
+	DRM_DEBUG_ATOMIC("CRTC%d_FLUSH: active_pipes: 0x%x, affected: 0x%x.\n",
+			 drm_crtc_index(crtc),
+			 kcrtc_st->active_pipes, kcrtc_st->affected_pipes);
+
+	/* step 1: update the pipeline/component state to HW */
+	if (has_bit(master->id, kcrtc_st->affected_pipes))
+		komeda_pipeline_update(master, old->state);
+
+	/* step 2: notify the HW to kickoff the update */
+	mdev->funcs->flush(mdev, master->id, kcrtc_st->active_pipes);
+}
+
+static void
+komeda_crtc_atomic_flush(struct drm_crtc *crtc,
+			 struct drm_crtc_state *old)
+{
+	/* commit with modeset will be handled in enable/disable */
+	if (drm_atomic_crtc_needs_modeset(crtc->state))
+		return;
+
+	komeda_crtc_do_flush(crtc, old);
+}
+
 struct drm_crtc_helper_funcs komeda_crtc_helper_funcs = {
 	.atomic_check	= komeda_crtc_atomic_check,
+	.atomic_flush	= komeda_crtc_atomic_flush,
 };
 
 static const struct drm_crtc_funcs komeda_crtc_funcs = {

drivers/gpu/drm/arm/display/komeda/komeda_dev.h

@@ -106,6 +106,9 @@ struct komeda_dev_funcs {
 
 	/** @dump_register: Optional, dump registers to seq_file */
 	void (*dump_register)(struct komeda_dev *mdev, struct seq_file *seq);
+	/** @flush: Notify the HW to flush or kickoff the update */
+	void (*flush)(struct komeda_dev *mdev,
+		      int master_pipe, u32 active_pipes);
 };
 
 /**

drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h

@@ -412,4 +412,9 @@ int komeda_build_display_data_flow(struct komeda_crtc *kcrtc,
 int komeda_release_unclaimed_resources(struct komeda_pipeline *pipe,
 				       struct komeda_crtc_state *kcrtc_st);
 
+void komeda_pipeline_disable(struct komeda_pipeline *pipe,
+			     struct drm_atomic_state *old_state);
+void komeda_pipeline_update(struct komeda_pipeline *pipe,
+			    struct drm_atomic_state *old_state);
+
 #endif /* _KOMEDA_PIPELINE_H_*/

drivers/gpu/drm/arm/display/komeda/komeda_pipeline_state.c

@@ -33,6 +33,18 @@ komeda_pipeline_get_state(struct komeda_pipeline *pipe,
 	return priv_to_pipe_st(priv_st);
 }
 
+struct komeda_pipeline_state *
+komeda_pipeline_get_old_state(struct komeda_pipeline *pipe,
+			      struct drm_atomic_state *state)
+{
+	struct drm_private_state *priv_st;
+
+	priv_st = drm_atomic_get_old_private_obj_state(state, &pipe->obj);
+	if (priv_st)
+		return priv_to_pipe_st(priv_st);
+	return NULL;
+}
+
 struct komeda_pipeline_state *
 komeda_pipeline_get_new_state(struct komeda_pipeline *pipe,
 			      struct drm_atomic_state *state)
@@ -538,3 +550,28 @@ int komeda_release_unclaimed_resources(struct komeda_pipeline *pipe,
 
 	return 0;
 }
+
+void komeda_pipeline_update(struct komeda_pipeline *pipe,
+			    struct drm_atomic_state *old_state)
+{
+	struct komeda_pipeline_state *new = priv_to_pipe_st(pipe->obj.state);
+	struct komeda_pipeline_state *old;
+	struct komeda_component *c;
+	u32 id, changed_comps = 0;
+
+	old = komeda_pipeline_get_old_state(pipe, old_state);
+
+	changed_comps = new->active_comps | old->active_comps;
+
+	DRM_DEBUG_ATOMIC("PIPE%d: active_comps: 0x%x, changed: 0x%x.\n",
+			 pipe->id, new->active_comps, changed_comps);
+
+	dp_for_each_set_bit(id, changed_comps) {
+		c = komeda_pipeline_get_component(pipe, id);
+
+		if (new->active_comps & BIT(c->id))
+			c->funcs->update(c, priv_to_comp_st(c->obj.state));
+		else
+			c->funcs->disable(c);
+	}
+}