drm/msm/mdp5: Allocate CTL for each display interface

In MDP5, CTL contains information of the whole pipeline whose
output goes down to a display interface. In various cases, one
interface may require 2 CRTCs, but only one CTL. Some interfaces
also require to use certain CTLs.

Instead of allocating CTL for each active CRTC, this change is to
associate a CTL with each interface.
Signed-off-by: Hai Li <hali@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/mdp/mdp5/mdp5_cmd_encoder.c

@@ -21,6 +21,8 @@ struct mdp5_cmd_encoder {
 	struct mdp5_interface intf;
 	bool enabled;
 	uint32_t bsc;
+
+	struct mdp5_ctl *ctl;
 };
 #define to_mdp5_cmd_encoder(x) container_of(x, struct mdp5_cmd_encoder, base)
 
@@ -210,13 +212,14 @@ static void mdp5_cmd_encoder_mode_set(struct drm_encoder *encoder,
 			mode->vsync_end, mode->vtotal,
 			mode->type, mode->flags);
 	pingpong_tearcheck_setup(encoder, mode);
-	mdp5_crtc_set_intf(encoder->crtc, &mdp5_cmd_enc->intf);
+	mdp5_crtc_set_pipeline(encoder->crtc, &mdp5_cmd_enc->intf,
+				mdp5_cmd_enc->ctl);
 }
 
 static void mdp5_cmd_encoder_disable(struct drm_encoder *encoder)
 {
 	struct mdp5_cmd_encoder *mdp5_cmd_enc = to_mdp5_cmd_encoder(encoder);
-	struct mdp5_ctl *ctl = mdp5_crtc_get_ctl(encoder->crtc);
+	struct mdp5_ctl *ctl = mdp5_cmd_enc->ctl;
 	struct mdp5_interface *intf = &mdp5_cmd_enc->intf;
 
 	if (WARN_ON(!mdp5_cmd_enc->enabled))
@@ -235,7 +238,7 @@ static void mdp5_cmd_encoder_disable(struct drm_encoder *encoder)
 static void mdp5_cmd_encoder_enable(struct drm_encoder *encoder)
 {
 	struct mdp5_cmd_encoder *mdp5_cmd_enc = to_mdp5_cmd_encoder(encoder);
-	struct mdp5_ctl *ctl = mdp5_crtc_get_ctl(encoder->crtc);
+	struct mdp5_ctl *ctl = mdp5_cmd_enc->ctl;
 	struct mdp5_interface *intf = &mdp5_cmd_enc->intf;
 
 	if (WARN_ON(mdp5_cmd_enc->enabled))
@@ -300,7 +303,7 @@ int mdp5_cmd_encoder_set_split_display(struct drm_encoder *encoder,
 
 /* initialize command mode encoder */
 struct drm_encoder *mdp5_cmd_encoder_init(struct drm_device *dev,
-				struct mdp5_interface *intf)
+			struct mdp5_interface *intf, struct mdp5_ctl *ctl)
 {
 	struct drm_encoder *encoder = NULL;
 	struct mdp5_cmd_encoder *mdp5_cmd_enc;
@@ -320,6 +323,7 @@ struct drm_encoder *mdp5_cmd_encoder_init(struct drm_device *dev,
 
 	memcpy(&mdp5_cmd_enc->intf, intf, sizeof(mdp5_cmd_enc->intf));
 	encoder = &mdp5_cmd_enc->base;
+	mdp5_cmd_enc->ctl = ctl;
 
 	drm_encoder_init(dev, encoder, &mdp5_cmd_encoder_funcs,
 			DRM_MODE_ENCODER_DSI);

drivers/gpu/drm/msm/mdp/mdp5/mdp5_crtc.c

@@ -160,8 +160,7 @@ static void complete_flip(struct drm_crtc *crtc, struct drm_file *file)
 
 	if (mdp5_crtc->ctl && !crtc->state->enable) {
 		/* set STAGE_UNUSED for all layers */
-		mdp5_ctl_blend(mdp5_crtc->ctl, mdp5_crtc->lm, NULL, 0, 0);
-		mdp5_ctl_release(mdp5_crtc->ctl);
+		mdp5_ctl_blend(mdp5_crtc->ctl, NULL, 0, 0);
 		mdp5_crtc->ctl = NULL;
 	}
 }
@@ -289,7 +288,7 @@ static void blend_setup(struct drm_crtc *crtc)
 				blender(i)), bg_alpha);
 	}
 
-	mdp5_ctl_blend(mdp5_crtc->ctl, lm, stage, plane_cnt, ctl_blend_flags);
+	mdp5_ctl_blend(mdp5_crtc->ctl, stage, plane_cnt, ctl_blend_flags);
 
 out:
 	spin_unlock_irqrestore(&mdp5_crtc->lm_lock, flags);
@@ -386,13 +385,6 @@ static int mdp5_crtc_atomic_check(struct drm_crtc *crtc,
 
 	DBG("%s: check", mdp5_crtc->name);
 
-	/* request a free CTL, if none is already allocated for this CRTC */
-	if (state->enable && !mdp5_crtc->ctl) {
-		mdp5_crtc->ctl = mdp5_ctlm_request(mdp5_kms->ctlm, crtc);
-		if (WARN_ON(!mdp5_crtc->ctl))
-			return -EINVAL;
-	}
-
 	/* verify that there are not too many planes attached to crtc
 	 * and that we don't have conflicting mixer stages:
 	 */
@@ -735,8 +727,8 @@ void mdp5_crtc_cancel_pending_flip(struct drm_crtc *crtc, struct drm_file *file)
 	complete_flip(crtc, file);
 }
 
-/* set interface for routing crtc->encoder: */
-void mdp5_crtc_set_intf(struct drm_crtc *crtc, struct mdp5_interface *intf)
+void mdp5_crtc_set_pipeline(struct drm_crtc *crtc,
+		struct mdp5_interface *intf, struct mdp5_ctl *ctl)
 {
 	struct mdp5_crtc *mdp5_crtc = to_mdp5_crtc(crtc);
 	struct mdp5_kms *mdp5_kms = get_kms(crtc);
@@ -759,7 +751,8 @@ void mdp5_crtc_set_intf(struct drm_crtc *crtc, struct mdp5_interface *intf)
 
 	mdp_irq_update(&mdp5_kms->base);
 
-	mdp5_ctl_set_intf(mdp5_crtc->ctl, intf);
+	mdp5_crtc->ctl = ctl;
+	mdp5_ctl_set_pipeline(ctl, intf, lm);
 }
 
 int mdp5_crtc_get_lm(struct drm_crtc *crtc)
@@ -768,12 +761,6 @@ int mdp5_crtc_get_lm(struct drm_crtc *crtc)
 	return WARN_ON(!crtc) ? -EINVAL : mdp5_crtc->lm;
 }
 
-struct mdp5_ctl *mdp5_crtc_get_ctl(struct drm_crtc *crtc)
-{
-	struct mdp5_crtc *mdp5_crtc = to_mdp5_crtc(crtc);
-	return WARN_ON(!crtc) ? NULL : mdp5_crtc->ctl;
-}
-
 void mdp5_crtc_wait_for_commit_done(struct drm_crtc *crtc)
 {
 	struct mdp5_crtc *mdp5_crtc = to_mdp5_crtc(crtc);

drivers/gpu/drm/msm/mdp/mdp5/mdp5_ctl.c

@@ -60,8 +60,6 @@ struct mdp5_ctl {
 	u32 pending_ctl_trigger;
 
 	bool cursor_on;
-
-	struct drm_crtc *crtc;
 };
 
 struct mdp5_ctl_manager {
@@ -168,11 +166,21 @@ static void set_ctl_op(struct mdp5_ctl *ctl, struct mdp5_interface *intf)
 	spin_unlock_irqrestore(&ctl->hw_lock, flags);
 }
 
-int mdp5_ctl_set_intf(struct mdp5_ctl *ctl, struct mdp5_interface *intf)
+int mdp5_ctl_set_pipeline(struct mdp5_ctl *ctl,
+		struct mdp5_interface *intf, int lm)
 {
 	struct mdp5_ctl_manager *ctl_mgr = ctl->ctlm;
 	struct mdp5_kms *mdp5_kms = get_kms(ctl_mgr);
 
+	if (unlikely(WARN_ON(intf->num != ctl->pipeline.intf.num))) {
+		dev_err(mdp5_kms->dev->dev,
+			"CTL %d is allocated by INTF %d, but used by INTF %d\n",
+			ctl->id, ctl->pipeline.intf.num, intf->num);
+		return -EINVAL;
+	}
+
+	ctl->lm = lm;
+
 	memcpy(&ctl->pipeline.intf, intf, sizeof(*intf));
 
 	ctl->pipeline.start_mask = mdp_ctl_flush_mask_lm(ctl->lm) |
@@ -335,7 +343,7 @@ static u32 mdp_ctl_blend_ext_mask(enum mdp5_pipe pipe,
 	}
 }
 
-int mdp5_ctl_blend(struct mdp5_ctl *ctl, u32 lm, u8 *stage, u32 stage_cnt,
+int mdp5_ctl_blend(struct mdp5_ctl *ctl, u8 *stage, u32 stage_cnt,
 	u32 ctl_blend_op_flags)
 {
 	unsigned long flags;
@@ -358,13 +366,13 @@ int mdp5_ctl_blend(struct mdp5_ctl *ctl, u32 lm, u8 *stage, u32 stage_cnt,
 	if (ctl->cursor_on)
 		blend_cfg |=  MDP5_CTL_LAYER_REG_CURSOR_OUT;
 
-	ctl_write(ctl, REG_MDP5_CTL_LAYER_REG(ctl->id, lm), blend_cfg);
-	ctl_write(ctl, REG_MDP5_CTL_LAYER_EXT_REG(ctl->id, lm), blend_ext_cfg);
+	ctl_write(ctl, REG_MDP5_CTL_LAYER_REG(ctl->id, ctl->lm), blend_cfg);
+	ctl_write(ctl, REG_MDP5_CTL_LAYER_EXT_REG(ctl->id, ctl->lm), blend_ext_cfg);
 	spin_unlock_irqrestore(&ctl->hw_lock, flags);
 
-	ctl->pending_ctl_trigger = mdp_ctl_flush_mask_lm(lm);
+	ctl->pending_ctl_trigger = mdp_ctl_flush_mask_lm(ctl->lm);
 
-	DBG("lm%d: blend config = 0x%08x. ext_cfg = 0x%08x", lm,
+	DBG("lm%d: blend config = 0x%08x. ext_cfg = 0x%08x", ctl->lm,
 		blend_cfg, blend_ext_cfg);
 
 	return 0;
@@ -490,38 +498,18 @@ u32 mdp5_ctl_get_commit_status(struct mdp5_ctl *ctl)
 	return ctl_read(ctl, REG_MDP5_CTL_FLUSH(ctl->id));
 }
 
-void mdp5_ctl_release(struct mdp5_ctl *ctl)
-{
-	struct mdp5_ctl_manager *ctl_mgr = ctl->ctlm;
-	unsigned long flags;
-
-	if (unlikely(WARN_ON(ctl->id >= MAX_CTL) || !ctl->busy)) {
-		dev_err(ctl_mgr->dev->dev, "CTL %d in bad state (%d)",
-				ctl->id, ctl->busy);
-		return;
-	}
-
-	spin_lock_irqsave(&ctl_mgr->pool_lock, flags);
-	ctl->busy = false;
-	spin_unlock_irqrestore(&ctl_mgr->pool_lock, flags);
-
-	DBG("CTL %d released", ctl->id);
-}
-
 int mdp5_ctl_get_ctl_id(struct mdp5_ctl *ctl)
 {
 	return WARN_ON(!ctl) ? -EINVAL : ctl->id;
 }
 
 /*
- * mdp5_ctl_request() - CTL dynamic allocation
- *
- * Note: Current implementation considers that we can only have one CRTC per CTL
+ * mdp5_ctl_request() - CTL allocation
  *
  * @return first free CTL
  */
 struct mdp5_ctl *mdp5_ctlm_request(struct mdp5_ctl_manager *ctl_mgr,
-		struct drm_crtc *crtc)
+		int intf_num)
 {
 	struct mdp5_ctl *ctl = NULL;
 	unsigned long flags;
@@ -539,9 +527,8 @@ struct mdp5_ctl *mdp5_ctlm_request(struct mdp5_ctl_manager *ctl_mgr,
 	}
 
 	ctl = &ctl_mgr->ctls[c];
-
-	ctl->lm = mdp5_crtc_get_lm(crtc);
-	ctl->crtc = crtc;
+	ctl->pipeline.intf.num = intf_num;
+	ctl->lm = -1;
 	ctl->busy = true;
 	ctl->pending_ctl_trigger = 0;
 	DBG("CTL %d allocated", ctl->id);

drivers/gpu/drm/msm/mdp/mdp5/mdp5_ctl.h

@@ -32,11 +32,12 @@ void mdp5_ctlm_destroy(struct mdp5_ctl_manager *ctlm);
  * mdp5_ctl_request(ctlm, ...) returns a ctl (CTL resource) handler,
  * which is then used to call the other mdp5_ctl_*(ctl, ...) functions.
  */
-struct mdp5_ctl *mdp5_ctlm_request(struct mdp5_ctl_manager *ctlm, struct drm_crtc *crtc);
+struct mdp5_ctl *mdp5_ctlm_request(struct mdp5_ctl_manager *ctlm, int intf_num);
 int mdp5_ctl_get_ctl_id(struct mdp5_ctl *ctl);
 
 struct mdp5_interface;
-int mdp5_ctl_set_intf(struct mdp5_ctl *ctl, struct mdp5_interface *intf);
+int mdp5_ctl_set_pipeline(struct mdp5_ctl *ctl, struct mdp5_interface *intf,
+				int lm);
 int mdp5_ctl_set_encoder_state(struct mdp5_ctl *ctl, bool enabled);
 
 int mdp5_ctl_set_cursor(struct mdp5_ctl *ctl, int cursor_id, bool enable);
@@ -53,7 +54,7 @@ int mdp5_ctl_set_cursor(struct mdp5_ctl *ctl, int cursor_id, bool enable);
  * (call mdp5_ctl_commit() with mdp_ctl_flush_mask_ctl() mask)
  */
 #define MDP5_CTL_BLEND_OP_FLAG_BORDER_OUT	BIT(0)
-int mdp5_ctl_blend(struct mdp5_ctl *ctl, u32 lm, u8 *stage, u32 stage_cnt,
+int mdp5_ctl_blend(struct mdp5_ctl *ctl, u8 *stage, u32 stage_cnt,
 	u32 ctl_blend_op_flags);
 
 /**
@@ -71,8 +72,6 @@ u32 mdp_ctl_flush_mask_encoder(struct mdp5_interface *intf);
 u32 mdp5_ctl_commit(struct mdp5_ctl *ctl, u32 flush_mask);
 u32 mdp5_ctl_get_commit_status(struct mdp5_ctl *ctl);
 
-void mdp5_ctl_release(struct mdp5_ctl *ctl);
-
 
 
 #endif /* __MDP5_CTL_H__ */

drivers/gpu/drm/msm/mdp/mdp5/mdp5_encoder.c

@@ -27,6 +27,8 @@ struct mdp5_encoder {
 	spinlock_t intf_lock;	/* protect REG_MDP5_INTF_* registers */
 	bool enabled;
 	uint32_t bsc;
+
+	struct mdp5_ctl *ctl;
 };
 #define to_mdp5_encoder(x) container_of(x, struct mdp5_encoder, base)
 
@@ -222,14 +224,15 @@ static void mdp5_encoder_mode_set(struct drm_encoder *encoder,
 
 	spin_unlock_irqrestore(&mdp5_encoder->intf_lock, flags);
 
-	mdp5_crtc_set_intf(encoder->crtc, &mdp5_encoder->intf);
+	mdp5_crtc_set_pipeline(encoder->crtc, &mdp5_encoder->intf,
+				mdp5_encoder->ctl);
 }
 
 static void mdp5_encoder_disable(struct drm_encoder *encoder)
 {
 	struct mdp5_encoder *mdp5_encoder = to_mdp5_encoder(encoder);
 	struct mdp5_kms *mdp5_kms = get_kms(encoder);
-	struct mdp5_ctl *ctl = mdp5_crtc_get_ctl(encoder->crtc);
+	struct mdp5_ctl *ctl = mdp5_encoder->ctl;
 	int lm = mdp5_crtc_get_lm(encoder->crtc);
 	struct mdp5_interface *intf = &mdp5_encoder->intf;
 	int intfn = mdp5_encoder->intf.num;
@@ -264,7 +267,7 @@ static void mdp5_encoder_enable(struct drm_encoder *encoder)
 {
 	struct mdp5_encoder *mdp5_encoder = to_mdp5_encoder(encoder);
 	struct mdp5_kms *mdp5_kms = get_kms(encoder);
-	struct mdp5_ctl *ctl = mdp5_crtc_get_ctl(encoder->crtc);
+	struct mdp5_ctl *ctl = mdp5_encoder->ctl;
 	struct mdp5_interface *intf = &mdp5_encoder->intf;
 	int intfn = mdp5_encoder->intf.num;
 	unsigned long flags;
@@ -329,7 +332,7 @@ int mdp5_encoder_set_split_display(struct drm_encoder *encoder,
 
 /* initialize encoder */
 struct drm_encoder *mdp5_encoder_init(struct drm_device *dev,
-				struct mdp5_interface *intf)
+			struct mdp5_interface *intf, struct mdp5_ctl *ctl)
 {
 	struct drm_encoder *encoder = NULL;
 	struct mdp5_encoder *mdp5_encoder;
@@ -345,6 +348,7 @@ struct drm_encoder *mdp5_encoder_init(struct drm_device *dev,
 
 	memcpy(&mdp5_encoder->intf, intf, sizeof(mdp5_encoder->intf));
 	encoder = &mdp5_encoder->base;
+	mdp5_encoder->ctl = ctl;
 
 	spin_lock_init(&mdp5_encoder->intf_lock);
 

drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c

@@ -198,7 +198,7 @@ int mdp5_enable(struct mdp5_kms *mdp5_kms)
 
 static struct drm_encoder *construct_encoder(struct mdp5_kms *mdp5_kms,
 		enum mdp5_intf_type intf_type, int intf_num,
-		enum mdp5_intf_mode intf_mode)
+		enum mdp5_intf_mode intf_mode, struct mdp5_ctl *ctl)
 {
 	struct drm_device *dev = mdp5_kms->dev;
 	struct msm_drm_private *priv = dev->dev_private;
@@ -211,9 +211,9 @@ static struct drm_encoder *construct_encoder(struct mdp5_kms *mdp5_kms,
 
 	if ((intf_type == INTF_DSI) &&
 		(intf_mode == MDP5_INTF_DSI_MODE_COMMAND))
-		encoder = mdp5_cmd_encoder_init(dev, &intf);
+		encoder = mdp5_cmd_encoder_init(dev, &intf, ctl);
 	else
-		encoder = mdp5_encoder_init(dev, &intf);
+		encoder = mdp5_encoder_init(dev, &intf, ctl);
 
 	if (IS_ERR(encoder)) {
 		dev_err(dev->dev, "failed to construct encoder\n");
@@ -251,6 +251,8 @@ static int modeset_init_intf(struct mdp5_kms *mdp5_kms, int intf_num)
 	const struct mdp5_cfg_hw *hw_cfg =
 					mdp5_cfg_get_hw_config(mdp5_kms->cfg);
 	enum mdp5_intf_type intf_type = hw_cfg->intf.connect[intf_num];
+	struct mdp5_ctl_manager *ctlm = mdp5_kms->ctlm;
+	struct mdp5_ctl *ctl;
 	struct drm_encoder *encoder;
 	int ret = 0;
 
@@ -261,8 +263,14 @@ static int modeset_init_intf(struct mdp5_kms *mdp5_kms, int intf_num)
 		if (!priv->edp)
 			break;
 
+		ctl = mdp5_ctlm_request(ctlm, intf_num);
+		if (!ctl) {
+			ret = -EINVAL;
+			break;
+		}
+
 		encoder = construct_encoder(mdp5_kms, INTF_eDP, intf_num,
-					MDP5_INTF_MODE_NONE);
+					MDP5_INTF_MODE_NONE, ctl);
 		if (IS_ERR(encoder)) {
 			ret = PTR_ERR(encoder);
 			break;
@@ -274,8 +282,14 @@ static int modeset_init_intf(struct mdp5_kms *mdp5_kms, int intf_num)
 		if (!priv->hdmi)
 			break;
 
+		ctl = mdp5_ctlm_request(ctlm, intf_num);
+		if (!ctl) {
+			ret = -EINVAL;
+			break;
+		}
+
 		encoder = construct_encoder(mdp5_kms, INTF_HDMI, intf_num,
-					MDP5_INTF_MODE_NONE);
+					MDP5_INTF_MODE_NONE, ctl);
 		if (IS_ERR(encoder)) {
 			ret = PTR_ERR(encoder);
 			break;
@@ -300,14 +314,20 @@ static int modeset_init_intf(struct mdp5_kms *mdp5_kms, int intf_num)
 		if (!priv->dsi[dsi_id])
 			break;
 
+		ctl = mdp5_ctlm_request(ctlm, intf_num);
+		if (!ctl) {
+			ret = -EINVAL;
+			break;
+		}
+
 		for (i = 0; i < MSM_DSI_ENCODER_NUM; i++) {
 			mode = (i == MSM_DSI_CMD_ENCODER_ID) ?
 				MDP5_INTF_DSI_MODE_COMMAND :
 				MDP5_INTF_DSI_MODE_VIDEO;
 			dsi_encs[i] = construct_encoder(mdp5_kms, INTF_DSI,
-							intf_num, mode);
-			if (IS_ERR(dsi_encs)) {
-				ret = PTR_ERR(dsi_encs);
+							intf_num, mode, ctl);
+			if (IS_ERR(dsi_encs[i])) {
+				ret = PTR_ERR(dsi_encs[i]);
 				break;
 			}
 		}

drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.h

@@ -228,26 +228,26 @@ struct drm_plane *mdp5_plane_init(struct drm_device *dev,
 uint32_t mdp5_crtc_vblank(struct drm_crtc *crtc);
 
 int mdp5_crtc_get_lm(struct drm_crtc *crtc);
-struct mdp5_ctl *mdp5_crtc_get_ctl(struct drm_crtc *crtc);
 void mdp5_crtc_cancel_pending_flip(struct drm_crtc *crtc, struct drm_file *file);
-void mdp5_crtc_set_intf(struct drm_crtc *crtc, struct mdp5_interface *intf);
+void mdp5_crtc_set_pipeline(struct drm_crtc *crtc,
+		struct mdp5_interface *intf, struct mdp5_ctl *ctl);
 void mdp5_crtc_wait_for_commit_done(struct drm_crtc *crtc);
 struct drm_crtc *mdp5_crtc_init(struct drm_device *dev,
 		struct drm_plane *plane, int id);
 
 struct drm_encoder *mdp5_encoder_init(struct drm_device *dev,
-		struct mdp5_interface *intf);
+		struct mdp5_interface *intf, struct mdp5_ctl *ctl);
 int mdp5_encoder_set_split_display(struct drm_encoder *encoder,
 					struct drm_encoder *slave_encoder);
 
 #ifdef CONFIG_DRM_MSM_DSI
 struct drm_encoder *mdp5_cmd_encoder_init(struct drm_device *dev,
-				struct mdp5_interface *intf);
+		struct mdp5_interface *intf, struct mdp5_ctl *ctl);
 int mdp5_cmd_encoder_set_split_display(struct drm_encoder *encoder,
 					struct drm_encoder *slave_encoder);
 #else
-static inline struct drm_encoder *mdp5_cmd_encoder_init(
-			struct drm_device *dev, struct mdp5_interface *intf)
+static inline struct drm_encoder *mdp5_cmd_encoder_init(struct drm_device *dev,
+		struct mdp5_interface *intf, struct mdp5_ctl *ctl)
 {
 	return ERR_PTR(-EINVAL);
 }