drm/msm/dpu: maintain hw_mdp in kms

hw_mdp block is common for displays. No need
to reserve per display.

changes in v2:
	- use IS_ERR for error checking (Jordan Crouse)
Signed-off-by: NJeykumar Sankaran <jsanka@codeaurora.org>
Reviewed-by: NSean Paul <seanpaul@chromium.org>
Signed-off-by: NSean Paul <seanpaul@chromium.org>

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

@@ -627,6 +627,10 @@ static void _dpu_kms_hw_destroy(struct dpu_kms *dpu_kms)
 		devm_iounmap(&dpu_kms->pdev->dev, dpu_kms->vbif[VBIF_RT]);
 	dpu_kms->vbif[VBIF_RT] = NULL;
 
+	if (dpu_kms->hw_mdp)
+		dpu_hw_mdp_destroy(dpu_kms->hw_mdp);
+	dpu_kms->hw_mdp = NULL;
+
 	if (dpu_kms->mmio)
 		devm_iounmap(&dpu_kms->pdev->dev, dpu_kms->mmio);
 	dpu_kms->mmio = NULL;
@@ -885,11 +889,10 @@ static int dpu_kms_hw_init(struct msm_kms *kms)
 
 	dpu_kms->rm_init = true;
 
-	dpu_kms->hw_mdp = dpu_rm_get_mdp(&dpu_kms->rm);
-	if (IS_ERR_OR_NULL(dpu_kms->hw_mdp)) {
+	dpu_kms->hw_mdp = dpu_hw_mdptop_init(MDP_TOP, dpu_kms->mmio,
+					     dpu_kms->catalog);
+	if (IS_ERR(dpu_kms->hw_mdp)) {
 		rc = PTR_ERR(dpu_kms->hw_mdp);
-		if (!dpu_kms->hw_mdp)
-			rc = -EINVAL;
 		DPU_ERROR("failed to get hw_mdp: %d\n", rc);
 		dpu_kms->hw_mdp = NULL;
 		goto power_error;

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

@@ -49,11 +49,6 @@ struct dpu_rm_hw_blk {
 	struct dpu_hw_blk *hw;
 };
 
-struct dpu_hw_mdp *dpu_rm_get_mdp(struct dpu_rm *rm)
-{
-	return rm->hw_mdp;
-}
-
 void dpu_rm_init_hw_iter(
 		struct dpu_rm_hw_iter *iter,
 		uint32_t enc_id,
@@ -148,9 +143,6 @@ int dpu_rm_destroy(struct dpu_rm *rm)
 		}
 	}
 
-	dpu_hw_mdp_destroy(rm->hw_mdp);
-	rm->hw_mdp = NULL;
-
 	mutex_destroy(&rm->rm_lock);
 
 	return 0;
@@ -165,11 +157,8 @@ static int _dpu_rm_hw_blk_create(
 		void *hw_catalog_info)
 {
 	struct dpu_rm_hw_blk *blk;
-	struct dpu_hw_mdp *hw_mdp;
 	void *hw;
 
-	hw_mdp = rm->hw_mdp;
-
 	switch (type) {
 	case DPU_HW_BLK_LM:
 		hw = dpu_hw_lm_init(id, mmio, cat);
@@ -233,15 +222,6 @@ int dpu_rm_init(struct dpu_rm *rm,
 	for (type = 0; type < DPU_HW_BLK_MAX; type++)
 		INIT_LIST_HEAD(&rm->hw_blks[type]);
 
-	/* Some of the sub-blocks require an mdptop to be created */
-	rm->hw_mdp = dpu_hw_mdptop_init(MDP_TOP, mmio, cat);
-	if (IS_ERR_OR_NULL(rm->hw_mdp)) {
-		rc = PTR_ERR(rm->hw_mdp);
-		rm->hw_mdp = NULL;
-		DPU_ERROR("failed: mdp hw not available\n");
-		goto fail;
-	}
-
 	/* Interrogate HW catalog and create tracking items for hw blocks */
 	for (i = 0; i < cat->mixer_count; i++) {
 		struct dpu_lm_cfg *lm = &cat->mixer[i];

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

@@ -24,13 +24,11 @@
  * struct dpu_rm - DPU dynamic hardware resource manager
  * @hw_blks: array of lists of hardware resources present in the system, one
  *	list per type of hardware block
- * @hw_mdp: hardware object for mdp_top
  * @lm_max_width: cached layer mixer maximum width
  * @rm_lock: resource manager mutex
  */
 struct dpu_rm {
 	struct list_head hw_blks[DPU_HW_BLK_MAX];
-	struct dpu_hw_mdp *hw_mdp;
 	uint32_t lm_max_width;
 	struct mutex rm_lock;
 };
@@ -103,14 +101,6 @@ int dpu_rm_reserve(struct dpu_rm *rm,
  */
 void dpu_rm_release(struct dpu_rm *rm, struct drm_encoder *enc);
 
-/**
- * dpu_rm_get_mdp - Retrieve HW block for MDP TOP.
- *	This is never reserved, and is usable by any display.
- * @rm: DPU Resource Manager handle
- * @Return: Pointer to hw block or NULL
- */
-struct dpu_hw_mdp *dpu_rm_get_mdp(struct dpu_rm *rm);
-
 /**
  * dpu_rm_init_hw_iter - setup given iterator for new iteration over hw list
  *	using dpu_rm_get_hw