[PATCH 20/25] drm/msm/dpu: refine layer mixer reservations

[Jeykumar Sankaran <jsanka@xxxxxxxxxxxxxx>]

Validate layer mixer pairs for compatibility before retrieving
the connected pingpong blocks.

Signed-off-by: Jeykumar Sankaran <jsanka@xxxxxxxxxxxxxx>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c | 61 ++++++++++------------------------
 1 file changed, 17 insertions(+), 44 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
index 85a0fe2..f794d13 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
@@ -235,61 +235,32 @@ static bool _dpu_rm_needs_split_display(const struct dpu_crtc_state *dpu_cstate)
 }
 
 /**
- * _dpu_rm_check_lm_and_get_connected_blks - check if proposed layer mixer meets
- *	proposed use case requirements, incl. hardwired dependent blocks like
- *	pingpong
+ * _dpu_rm_get_connected_pp - retrieve hardwired pingpong block
  * @rm: dpu resource manager handle
  * @lm: proposed layer mixer, function checks if lm, and all other hardwired
- *      blocks connected to the lm (pp) is available and appropriate
- * @pp: output parameter, pingpong block attached to the layer mixer.
- *      NULL if pp was not available, or not matching requirements.
- * @primary_lm: if non-null, this function check if lm is compatible primary_lm
- *              as well as satisfying all other requirements
- * @Return: true if lm matches all requirements, false otherwise
+ * @Return: handle to ping pong rm block
  */
-static bool _dpu_rm_check_lm_and_get_connected_blks(
-		struct dpu_rm *rm,
-		struct dpu_rm_hw_blk *lm,
-		struct dpu_rm_hw_blk **pp,
-		struct dpu_rm_hw_blk *primary_lm)
+static struct dpu_rm_hw_blk *
+_dpu_rm_get_connected_pp(struct dpu_rm *rm, struct dpu_rm_hw_blk *lm)
 {
 	const struct dpu_lm_cfg *lm_cfg = to_dpu_hw_mixer(lm->hw)->cap;
-	struct dpu_rm_hw_blk *iter;
 	struct list_head *blk_list = &rm->hw_blks[DPU_HW_BLK_PINGPONG];
-
-	*pp = NULL;
-
-	DPU_DEBUG("check lm %d pp %d\n",
-			   lm_cfg->id, lm_cfg->pingpong);
-
-	/* Check if this layer mixer is a peer of the proposed primary LM */
-	if (primary_lm) {
-		const struct dpu_lm_cfg *prim_lm_cfg =
-				to_dpu_hw_mixer(primary_lm->hw)->cap;
-
-		if (!test_bit(lm_cfg->id, &prim_lm_cfg->lm_pair_mask)) {
-			DPU_DEBUG("lm %d not peer of lm %d\n", lm_cfg->id,
-					prim_lm_cfg->id);
-			return false;
-		}
-	}
+	struct dpu_rm_hw_blk *iter, *pp = NULL;
 
 	list_for_each_entry(iter, blk_list, list) {
 		if (iter->in_use)
 			continue;
 
 		if (iter->hw->id == lm_cfg->pingpong) {
-			*pp = iter;
+			pp = iter;
 			break;
 		}
 	}
 
-	if (!*pp) {
-		DPU_ERROR("failed to get pp on lm %d\n", lm_cfg->pingpong);
-		return false;
-	}
+	if (!pp)
+		DPU_ERROR("failed to get pp on lm %d\n", lm->hw->id);
 
-	return true;
+	return pp;
 }
 
 static int _dpu_rm_reserve_lms(struct dpu_rm *rm,
@@ -315,15 +286,15 @@ static int _dpu_rm_reserve_lms(struct dpu_rm *rm,
 
 		lm_count = 0;
 		lm[lm_count] = iter_i;
-
-		if (!_dpu_rm_check_lm_and_get_connected_blks(
-				rm, lm[lm_count], &pp[lm_count], NULL))
-			continue;
+		pp[lm_count] = _dpu_rm_get_connected_pp(rm, iter_i);
 
 		++lm_count;
 
 		/* Valid primary mixer found, find matching peers */
 		list_for_each_entry(iter_j, blk_list, list) {
+			const struct dpu_lm_cfg *prim_lm_cfg =
+					to_dpu_hw_mixer(iter_i->hw)->cap;
+
 			if (iter_j->in_use)
 				continue;
 
@@ -333,11 +304,13 @@ static int _dpu_rm_reserve_lms(struct dpu_rm *rm,
 			if (iter_i == iter_j)
 				continue;
 
-			if (!_dpu_rm_check_lm_and_get_connected_blks(
-					rm, iter_j, &pp[lm_count], iter_i))
+			if (!test_bit(iter_j->hw->id,
+				      &prim_lm_cfg->lm_pair_mask))
 				continue;
 
 			lm[lm_count] = iter_j;
+			pp[lm_count] = _dpu_rm_get_connected_pp(rm, iter_j);
+
 			++lm_count;
 		}
 	}
-- 
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