drm/msm/dpu: use devres-managed allocation for VBIF data

Use devm_kzalloc to create VBIF data structure. This allows us to
remove corresponding kfree and drop dpu_hw_vbif_destroy() function.
Reviewed-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/570040/
Link: https://lore.kernel.org/r/20231201211845.1026967-5-dmitry.baryshkov@linaro.org

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

@@ -2,6 +2,8 @@
 /* Copyright (c) 2015-2018, The Linux Foundation. All rights reserved.
  */
 
+#include <drm/drm_managed.h>
+
 #include "dpu_hwio.h"
 #include "dpu_hw_catalog.h"
 #include "dpu_hw_vbif.h"
@@ -211,12 +213,13 @@ static void _setup_vbif_ops(struct dpu_hw_vbif_ops *ops,
 	ops->set_write_gather_en = dpu_hw_set_write_gather_en;
 }
 
-struct dpu_hw_vbif *dpu_hw_vbif_init(const struct dpu_vbif_cfg *cfg,
-		void __iomem *addr)
+struct dpu_hw_vbif *dpu_hw_vbif_init(struct drm_device *dev,
+				     const struct dpu_vbif_cfg *cfg,
+				     void __iomem *addr)
 {
 	struct dpu_hw_vbif *c;
 
-	c = kzalloc(sizeof(*c), GFP_KERNEL);
+	c = drmm_kzalloc(dev, sizeof(*c), GFP_KERNEL);
 	if (!c)
 		return ERR_PTR(-ENOMEM);
 
@@ -234,8 +237,3 @@ struct dpu_hw_vbif *dpu_hw_vbif_init(const struct dpu_vbif_cfg *cfg,
 
 	return c;
 }
-
-void dpu_hw_vbif_destroy(struct dpu_hw_vbif *vbif)
-{
-	kfree(vbif);
-}

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

@@ -108,12 +108,12 @@ struct dpu_hw_vbif {
 /**
  * dpu_hw_vbif_init() - Initializes the VBIF driver for the passed
  * VBIF catalog entry.
+ * @dev:  Corresponding device for devres management
  * @cfg:  VBIF catalog entry for which driver object is required
  * @addr: Mapped register io address of MDSS
  */
-struct dpu_hw_vbif *dpu_hw_vbif_init(const struct dpu_vbif_cfg *cfg,
-		void __iomem *addr);
-
-void dpu_hw_vbif_destroy(struct dpu_hw_vbif *vbif);
+struct dpu_hw_vbif *dpu_hw_vbif_init(struct drm_device *dev,
+				     const struct dpu_vbif_cfg *cfg,
+				     void __iomem *addr);
 
 #endif /*_DPU_HW_VBIF_H */

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

@@ -800,13 +800,8 @@ static void _dpu_kms_hw_destroy(struct dpu_kms *dpu_kms)
 	/* safe to call these more than once during shutdown */
 	_dpu_kms_mmu_destroy(dpu_kms);
 
-	if (dpu_kms->catalog) {
-		for (i = 0; i < ARRAY_SIZE(dpu_kms->hw_vbif); i++) {
-			if (dpu_kms->hw_vbif[i]) {
-				dpu_hw_vbif_destroy(dpu_kms->hw_vbif[i]);
-				dpu_kms->hw_vbif[i] = NULL;
-			}
-		}
+	for (i = 0; i < ARRAY_SIZE(dpu_kms->hw_vbif); i++) {
+		dpu_kms->hw_vbif[i] = NULL;
 	}
 
 	if (dpu_kms->rm_init)
@@ -1109,7 +1104,7 @@ static int dpu_kms_hw_init(struct msm_kms *kms)
 		struct dpu_hw_vbif *hw;
 		const struct dpu_vbif_cfg *vbif = &dpu_kms->catalog->vbif[i];
 
-		hw = dpu_hw_vbif_init(vbif, dpu_kms->vbif[vbif->id]);
+		hw = dpu_hw_vbif_init(dev, vbif, dpu_kms->vbif[vbif->id]);
 		if (IS_ERR(hw)) {
 			rc = PTR_ERR(hw);
 			DPU_ERROR("failed to init vbif %d: %d\n", vbif->id, rc);