drm/msm/dpu: remove RM topology definition

RM maintained a redundant definition for display topology
to identify the no. of hw blocks needed for a display
and their hardware dependencies. This information can be
implicitly deduced from the msm_display_topology structure
available in RM reserve request. In addition to getting
rid of the redundant topology, this change also removes
the topology name enums and their usages.

changes in v4:
	- remove the topology name enum entirely (Sean)
changes in v5:
	- remove RM topology definition and their
	  references (Sean)
	- Implement helper for dual mixer CRTC (Sean)
changes in v6:
	- avoid heap memory for topology (Sean)
Signed-off-by: Jeykumar Sankaran <jsanka@codeaurora.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h

@@ -237,6 +237,16 @@ struct dpu_crtc_state {
 #define to_dpu_crtc_state(x) \
 	container_of(x, struct dpu_crtc_state, base)
 
+/**
+ * dpu_crtc_state_is_stereo - Is crtc virtualized with two mixers?
+ * @cstate: Pointer to dpu crtc state
+ * @Return: true - has two mixers, false - has one mixer
+ */
+static inline bool dpu_crtc_state_is_stereo(struct dpu_crtc_state *cstate)
+{
+	return cstate->num_mixers == CRTC_DUAL_MIXERS;
+}
+
 /**
  * dpu_crtc_get_mixer_height - get the mixer height
  * Mixer height will be same as panel height

drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c

@@ -1003,7 +1003,6 @@ static void dpu_encoder_virt_mode_set(struct drm_encoder *drm_enc,
 	struct drm_connector *conn = NULL, *conn_iter;
 	struct dpu_rm_hw_iter pp_iter, ctl_iter;
 	struct msm_display_topology topology;
-	enum dpu_rm_topology_name topology_name;
 	struct dpu_hw_ctl *hw_ctl[MAX_CHANNELS_PER_ENC] = { NULL };
 	int i = 0, ret;
 
@@ -1059,7 +1058,6 @@ static void dpu_encoder_virt_mode_set(struct drm_encoder *drm_enc,
 		hw_ctl[i] = (struct dpu_hw_ctl *)ctl_iter.hw;
 	}
 
-	topology_name = dpu_rm_get_topology_name(topology);
 	for (i = 0; i < dpu_enc->num_phys_encs; i++) {
 		struct dpu_encoder_phys *phys = dpu_enc->phys_encs[i];
 
@@ -1080,7 +1078,6 @@ static void dpu_encoder_virt_mode_set(struct drm_encoder *drm_enc,
 			phys->hw_ctl = hw_ctl[i];
 
 			phys->connector = conn->state->connector;
-			phys->topology_name = topology_name;
 			if (phys->ops.mode_set)
 				phys->ops.mode_set(phys, mode, adj_mode);
 		}

drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h

@@ -32,7 +32,6 @@
 /**
  * Encoder functions and data types
  * @intfs:	Interfaces this encoder is using, INTF_MODE_NONE if unused
- * @topology:   Topology of the display
  */
 struct dpu_encoder_hw_resources {
 	enum dpu_intf_mode intfs[INTF_MAX];

drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h

@@ -23,6 +23,7 @@
 #include "dpu_hw_ctl.h"
 #include "dpu_hw_top.h"
 #include "dpu_encoder.h"
+#include "dpu_crtc.h"
 
 #define DPU_ENCODER_NAME_MAX	16
 
@@ -209,7 +210,6 @@ struct dpu_encoder_irq {
  * @split_role:		Role to play in a split-panel configuration
  * @intf_mode:		Interface mode
  * @intf_idx:		Interface index on dpu hardware
- * @topology_name:	topology selected for the display
  * @enc_spinlock:	Virtual-Encoder-Wide Spin Lock for IRQ purposes
  * @enable_state:	Enable state tracking
  * @vblank_refcount:	Reference count of vblank request
@@ -237,7 +237,6 @@ struct dpu_encoder_phys {
 	enum dpu_enc_split_role split_role;
 	enum dpu_intf_mode intf_mode;
 	enum dpu_intf intf_idx;
-	enum dpu_rm_topology_name topology_name;
 	spinlock_t *enc_spinlock;
 	enum dpu_enc_enable_state enable_state;
 	atomic_t vblank_refcount;
@@ -355,11 +354,15 @@ void dpu_encoder_helper_hw_reset(struct dpu_encoder_phys *phys_enc);
 static inline enum dpu_3d_blend_mode dpu_encoder_helper_get_3d_blend_mode(
 		struct dpu_encoder_phys *phys_enc)
 {
+	struct dpu_crtc_state *dpu_cstate;
+
 	if (!phys_enc || phys_enc->enable_state == DPU_ENC_DISABLING)
 		return BLEND_3D_NONE;
 
+	dpu_cstate = to_dpu_crtc_state(phys_enc->parent->crtc->state);
+
 	if (phys_enc->split_role == ENC_ROLE_SOLO &&
-	    phys_enc->topology_name == DPU_RM_TOPOLOGY_DUALPIPE_3DMERGE)
+	    dpu_crtc_state_is_stereo(dpu_cstate))
 		return BLEND_3D_H_ROW_INT;
 
 	return BLEND_3D_NONE;

drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c

@@ -355,13 +355,14 @@ static void dpu_encoder_phys_vid_underrun_irq(void *arg, int irq_idx)
 
 static bool _dpu_encoder_phys_is_dual_ctl(struct dpu_encoder_phys *phys_enc)
 {
+	struct dpu_crtc_state *dpu_cstate;
+
 	if (!phys_enc)
 		return false;
 
-	if (phys_enc->topology_name == DPU_RM_TOPOLOGY_DUALPIPE)
-		return true;
+	dpu_cstate = to_dpu_crtc_state(phys_enc->parent->crtc->state);
 
-	return false;
+	return dpu_cstate->num_ctls > 1;
 }
 
 static bool dpu_encoder_phys_vid_needs_single_flush(

drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c

@@ -24,33 +24,13 @@
 #define RESERVED_BY_OTHER(h, r) \
 	((h)->rsvp && ((h)->rsvp->enc_id != (r)->enc_id))
 
-#define RM_IS_TOPOLOGY_MATCH(t, r) ((t).num_lm == (r).num_lm && \
-				(t).num_comp_enc == (r).num_enc && \
-				(t).num_intf == (r).num_intf)
-
-struct dpu_rm_topology_def {
-	enum dpu_rm_topology_name top_name;
-	int num_lm;
-	int num_comp_enc;
-	int num_intf;
-	int num_ctl;
-	int needs_split_display;
-};
-
-static const struct dpu_rm_topology_def g_top_table[] = {
-	{   DPU_RM_TOPOLOGY_NONE,                 0, 0, 0, 0, false },
-	{   DPU_RM_TOPOLOGY_SINGLEPIPE,           1, 0, 1, 1, false },
-	{   DPU_RM_TOPOLOGY_DUALPIPE,             2, 0, 2, 2, true  },
-	{   DPU_RM_TOPOLOGY_DUALPIPE_3DMERGE,     2, 0, 1, 1, false },
-};
-
 /**
  * struct dpu_rm_requirements - Reservation requirements parameter bundle
- * @top:       selected topology for the display
+ * @topology:  selected topology for the display
  * @hw_res:	   Hardware resources required as reported by the encoders
  */
 struct dpu_rm_requirements {
-	const struct dpu_rm_topology_def *topology;
+	struct msm_display_topology topology;
 	struct dpu_encoder_hw_resources hw_res;
 };
 
@@ -66,13 +46,11 @@ struct dpu_rm_requirements {
  * @enc_id:	Reservations are tracked by Encoder DRM object ID.
  *		CRTCs may be connected to multiple Encoders.
  *		An encoder or connector id identifies the display path.
- * @topology	DRM<->HW topology use case
  */
 struct dpu_rm_rsvp {
 	struct list_head list;
 	uint32_t seq;
 	uint32_t enc_id;
-	enum dpu_rm_topology_name topology;
 };
 
 /**
@@ -116,8 +94,8 @@ static void _dpu_rm_print_rsvps(
 	DPU_DEBUG("%d\n", stage);
 
 	list_for_each_entry(rsvp, &rm->rsvps, list) {
-		DRM_DEBUG_KMS("%d rsvp[s%ue%u] topology %d\n", stage, rsvp->seq,
-			      rsvp->enc_id, rsvp->topology);
+		DRM_DEBUG_KMS("%d rsvp[s%ue%u]\n", stage, rsvp->seq,
+			      rsvp->enc_id);
 	}
 
 	for (type = 0; type < DPU_HW_BLK_MAX; type++) {
@@ -140,18 +118,6 @@ struct dpu_hw_mdp *dpu_rm_get_mdp(struct dpu_rm *rm)
 	return rm->hw_mdp;
 }
 
-enum dpu_rm_topology_name
-dpu_rm_get_topology_name(struct msm_display_topology topology)
-{
-	int i;
-
-	for (i = 0; i < DPU_RM_TOPOLOGY_MAX; i++)
-		if (RM_IS_TOPOLOGY_MATCH(g_top_table[i], topology))
-			return g_top_table[i].top_name;
-
-	return DPU_RM_TOPOLOGY_NONE;
-}
-
 void dpu_rm_init_hw_iter(
 		struct dpu_rm_hw_iter *iter,
 		uint32_t enc_id,
@@ -434,6 +400,11 @@ int dpu_rm_init(struct dpu_rm *rm,
 	return rc;
 }
 
+static bool _dpu_rm_needs_split_display(const struct msm_display_topology *top)
+{
+	return top->num_intf > 1;
+}
+
 /**
  * _dpu_rm_check_lm_and_get_connected_blks - check if proposed layer mixer meets
  *	proposed use case requirements, incl. hardwired dependent blocks like
@@ -517,14 +488,14 @@ static int _dpu_rm_reserve_lms(
 	int lm_count = 0;
 	int i, rc = 0;
 
-	if (!reqs->topology->num_lm) {
-		DPU_ERROR("invalid number of lm: %d\n", reqs->topology->num_lm);
+	if (!reqs->topology.num_lm) {
+		DPU_ERROR("invalid number of lm: %d\n", reqs->topology.num_lm);
 		return -EINVAL;
 	}
 
 	/* Find a primary mixer */
 	dpu_rm_init_hw_iter(&iter_i, 0, DPU_HW_BLK_LM);
-	while (lm_count != reqs->topology->num_lm &&
+	while (lm_count != reqs->topology.num_lm &&
 			_dpu_rm_get_hw_locked(rm, &iter_i)) {
 		memset(&lm, 0, sizeof(lm));
 		memset(&pp, 0, sizeof(pp));
@@ -542,7 +513,7 @@ static int _dpu_rm_reserve_lms(
 		/* Valid primary mixer found, find matching peers */
 		dpu_rm_init_hw_iter(&iter_j, 0, DPU_HW_BLK_LM);
 
-		while (lm_count != reqs->topology->num_lm &&
+		while (lm_count != reqs->topology.num_lm &&
 				_dpu_rm_get_hw_locked(rm, &iter_j)) {
 			if (iter_i.blk == iter_j.blk)
 				continue;
@@ -557,7 +528,7 @@ static int _dpu_rm_reserve_lms(
 		}
 	}
 
-	if (lm_count != reqs->topology->num_lm) {
+	if (lm_count != reqs->topology.num_lm) {
 		DPU_DEBUG("unable to find appropriate mixers\n");
 		return -ENAVAIL;
 	}
@@ -579,14 +550,20 @@ static int _dpu_rm_reserve_lms(
 static int _dpu_rm_reserve_ctls(
 		struct dpu_rm *rm,
 		struct dpu_rm_rsvp *rsvp,
-		const struct dpu_rm_topology_def *top)
+		const struct msm_display_topology *top)
 {
 	struct dpu_rm_hw_blk *ctls[MAX_BLOCKS];
 	struct dpu_rm_hw_iter iter;
-	int i = 0;
+	int i = 0, num_ctls = 0;
+	bool needs_split_display = false;
 
 	memset(&ctls, 0, sizeof(ctls));
 
+	/* each hw_intf needs its own hw_ctrl to program its control path */
+	num_ctls = top->num_intf;
+
+	needs_split_display = _dpu_rm_needs_split_display(top);
+
 	dpu_rm_init_hw_iter(&iter, 0, DPU_HW_BLK_CTL);
 	while (_dpu_rm_get_hw_locked(rm, &iter)) {
 		const struct dpu_hw_ctl *ctl = to_dpu_hw_ctl(iter.blk->hw);
@@ -600,20 +577,20 @@ static int _dpu_rm_reserve_ctls(
 
 		DPU_DEBUG("ctl %d caps 0x%lX\n", iter.blk->id, features);
 
-		if (top->needs_split_display != has_split_display)
+		if (needs_split_display != has_split_display)
 			continue;
 
 		ctls[i] = iter.blk;
 		DPU_DEBUG("ctl %d match\n", iter.blk->id);
 
-		if (++i == top->num_ctl)
+		if (++i == num_ctls)
 			break;
 	}
 
-	if (i != top->num_ctl)
+	if (i != num_ctls)
 		return -ENAVAIL;
 
-	for (i = 0; i < ARRAY_SIZE(ctls) && i < top->num_ctl; i++) {
+	for (i = 0; i < ARRAY_SIZE(ctls) && i < num_ctls; i++) {
 		ctls[i]->rsvp_nxt = rsvp;
 		trace_dpu_rm_reserve_ctls(ctls[i]->id, ctls[i]->type,
 					  rsvp->enc_id);
@@ -686,12 +663,10 @@ static int _dpu_rm_make_next_rsvp(
 		struct dpu_rm_requirements *reqs)
 {
 	int ret;
-	struct dpu_rm_topology_def topology;
 
 	/* Create reservation info, tag reserved blocks with it as we go */
 	rsvp->seq = ++rm->rsvp_next_seq;
 	rsvp->enc_id = enc->base.id;
-	rsvp->topology = reqs->topology->top_name;
 	list_add_tail(&rsvp->list, &rm->rsvps);
 
 	ret = _dpu_rm_reserve_lms(rm, rsvp, reqs);
@@ -700,17 +675,7 @@ static int _dpu_rm_make_next_rsvp(
 		return ret;
 	}
 
-	/*
-	 * Do assignment preferring to give away low-resource CTLs first:
-	 * - Check mixers without Split Display
-	 * - Only then allow to grab from CTLs with split display capability
-	 */
-	_dpu_rm_reserve_ctls(rm, rsvp, reqs->topology);
-	if (ret && !reqs->topology->needs_split_display) {
-		memcpy(&topology, reqs->topology, sizeof(topology));
-		topology.needs_split_display = true;
-		_dpu_rm_reserve_ctls(rm, rsvp, &topology);
-	}
+	ret = _dpu_rm_reserve_ctls(rm, rsvp, &reqs->topology);
 	if (ret) {
 		DPU_ERROR("unable to find appropriate CTL\n");
 		return ret;
@@ -730,29 +695,13 @@ static int _dpu_rm_populate_requirements(
 		struct dpu_rm_requirements *reqs,
 		struct msm_display_topology req_topology)
 {
-	int i;
-
-	memset(reqs, 0, sizeof(*reqs));
-
 	dpu_encoder_get_hw_resources(enc, &reqs->hw_res);
 
-	for (i = 0; i < DPU_RM_TOPOLOGY_MAX; i++) {
-		if (RM_IS_TOPOLOGY_MATCH(g_top_table[i],
-					req_topology)) {
-			reqs->topology = &g_top_table[i];
-			break;
-		}
-	}
+	reqs->topology = req_topology;
 
-	if (!reqs->topology) {
-		DPU_ERROR("invalid topology for the display\n");
-		return -EINVAL;
-	}
-
-	DRM_DEBUG_KMS("num_lm: %d num_ctl: %d topology: %d split_display: %d\n",
-		      reqs->topology->num_lm, reqs->topology->num_ctl,
-		      reqs->topology->top_name,
-		      reqs->topology->needs_split_display);
+	DRM_DEBUG_KMS("num_lm: %d num_enc: %d num_intf: %d\n",
+		      reqs->topology.num_lm, reqs->topology.num_enc,
+		      reqs->topology.num_intf);
 
 	return 0;
 }
@@ -843,11 +792,10 @@ void dpu_rm_release(struct dpu_rm *rm, struct drm_encoder *enc)
 	mutex_unlock(&rm->rm_lock);
 }
 
-static int _dpu_rm_commit_rsvp(struct dpu_rm *rm, struct dpu_rm_rsvp *rsvp)
+static void _dpu_rm_commit_rsvp(struct dpu_rm *rm, struct dpu_rm_rsvp *rsvp)
 {
 	struct dpu_rm_hw_blk *blk;
 	enum dpu_hw_blk_type type;
-	int ret = 0;
 
 	/* Swap next rsvp to be the active */
 	for (type = 0; type < DPU_HW_BLK_MAX; type++) {
@@ -858,12 +806,6 @@ static int _dpu_rm_commit_rsvp(struct dpu_rm *rm, struct dpu_rm_rsvp *rsvp)
 			}
 		}
 	}
-
-	if (!ret)
-		DRM_DEBUG_KMS("rsrv enc %d topology %d\n", rsvp->enc_id,
-			      rsvp->topology);
-
-	return ret;
 }
 
 int dpu_rm_reserve(

drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h

@@ -20,21 +20,6 @@
 #include "msm_kms.h"
 #include "dpu_hw_top.h"
 
-/**
- * enum dpu_rm_topology_name - HW resource use case in use by connector
- * @DPU_RM_TOPOLOGY_NONE:                 No topology in use currently
- * @DPU_RM_TOPOLOGY_SINGLEPIPE:           1 LM, 1 PP, 1 INTF/WB
- * @DPU_RM_TOPOLOGY_DUALPIPE:             2 LM, 2 PP, 2 INTF/WB
- * @DPU_RM_TOPOLOGY_DUALPIPE_3DMERGE:     2 LM, 2 PP, 3DMux, 1 INTF/WB
- */
-enum dpu_rm_topology_name {
-	DPU_RM_TOPOLOGY_NONE = 0,
-	DPU_RM_TOPOLOGY_SINGLEPIPE,
-	DPU_RM_TOPOLOGY_DUALPIPE,
-	DPU_RM_TOPOLOGY_DUALPIPE_3DMERGE,
-	DPU_RM_TOPOLOGY_MAX,
-};
-
 /**
  * struct dpu_rm - DPU dynamic hardware resource manager
  * @dev: device handle for event logging purposes
@@ -167,13 +152,4 @@ bool dpu_rm_get_hw(struct dpu_rm *rm, struct dpu_rm_hw_iter *iter);
  */
 int dpu_rm_check_property_topctl(uint64_t val);
 
-/**
- * dpu_rm_get_topology_name - returns the name of the the given topology
- *                            definition
- * @topology: topology definition
- * @Return: name of the topology
- */
-enum dpu_rm_topology_name
-dpu_rm_get_topology_name(struct msm_display_topology topology);
-
 #endif /* __DPU_RM_H__ */