Re: [PATCH 1/3] drm/msm/dpu: index dpu_kms->hw_vbif using vbif_idx

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Assuming this series is newer and supersedes https://patchwork.freedesktop.org/patch/464353/?series=97307&rev=2,

please check below.

On 2/16/2022 7:45 PM, Dmitry Baryshkov wrote:
Remove loops over hw_vbif. Instead always VBIF's idx as an index in the
array. This fixes an error in dpu_kms_hw_init(), where we fill
dpu_kms->hw_vbif[i], but check for an error pointer at
dpu_kms->hw_vbif[vbif_idx].

Fixes: 25fdd5933e4c ("drm/msm: Add SDM845 DPU support")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
---
  drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c  | 10 ++++----
  drivers/gpu/drm/msm/disp/dpu1/dpu_vbif.c | 29 +++++++++++-------------
  2 files changed, 17 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index d0653a9ec694..81a35c8d62e7 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -790,11 +790,9 @@ static void _dpu_kms_hw_destroy(struct dpu_kms *dpu_kms)
  	_dpu_kms_mmu_destroy(dpu_kms);
if (dpu_kms->catalog) {
-		for (i = 0; i < dpu_kms->catalog->vbif_count; i++) {
-			u32 vbif_idx = dpu_kms->catalog->vbif[i].id;
-
-			if ((vbif_idx < VBIF_MAX) && dpu_kms->hw_vbif[vbif_idx])
-				dpu_hw_vbif_destroy(dpu_kms->hw_vbif[vbif_idx]);
+		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]);
  		}
  	}
@@ -1102,7 +1100,7 @@ static int dpu_kms_hw_init(struct msm_kms *kms)
  	for (i = 0; i < dpu_kms->catalog->vbif_count; i++) {
  		u32 vbif_idx = dpu_kms->catalog->vbif[i].id;
- dpu_kms->hw_vbif[i] = dpu_hw_vbif_init(vbif_idx,
+		dpu_kms->hw_vbif[vbif_idx] = dpu_hw_vbif_init(vbif_idx,
  				dpu_kms->vbif[vbif_idx], dpu_kms->catalog);
  		if (IS_ERR_OR_NULL(dpu_kms->hw_vbif[vbif_idx])) {
  			rc = PTR_ERR(dpu_kms->hw_vbif[vbif_idx]);
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_vbif.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_vbif.c
index 21d20373eb8b..cbbf77b17fc3 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_vbif.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_vbif.c
@@ -11,6 +11,14 @@
  #include "dpu_hw_vbif.h"
  #include "dpu_trace.h"
+static struct dpu_hw_vbif *dpu_get_vbif(struct dpu_kms *dpu_kms, enum dpu_vbif vbif_idx)
+{
+	if (vbif_idx > ARRAY_SIZE(dpu_kms->hw_vbif))
+		return dpu_kms->hw_vbif[vbif_idx];

Shouldnt this be

if (vbif_idx < ARRAY_SIZE(dpu_kms->hw_vbif))
	return dpu_kms->hw_vbif[vbif_idx];

+
+	return NULL;
+}
+
  /**
   * _dpu_vbif_wait_for_xin_halt - wait for the xin to halt
   * @vbif:	Pointer to hardware vbif driver
@@ -148,20 +156,15 @@ static u32 _dpu_vbif_get_ot_limit(struct dpu_hw_vbif *vbif,
  void dpu_vbif_set_ot_limit(struct dpu_kms *dpu_kms,
  		struct dpu_vbif_set_ot_params *params)
  {
-	struct dpu_hw_vbif *vbif = NULL;
+	struct dpu_hw_vbif *vbif;
  	struct dpu_hw_mdp *mdp;
  	bool forced_on = false;
  	u32 ot_lim;
-	int ret, i;
+	int ret;
mdp = dpu_kms->hw_mdp; - for (i = 0; i < ARRAY_SIZE(dpu_kms->hw_vbif); i++) {
-		if (dpu_kms->hw_vbif[i] &&
-				dpu_kms->hw_vbif[i]->idx == params->vbif_idx)
-			vbif = dpu_kms->hw_vbif[i];
-	}
-
+	vbif = dpu_get_vbif(dpu_kms, params->vbif_idx);
  	if (!vbif || !mdp) {
  		DRM_DEBUG_ATOMIC("invalid arguments vbif %d mdp %d\n",
  				vbif != NULL, mdp != NULL);
@@ -204,7 +207,7 @@ void dpu_vbif_set_ot_limit(struct dpu_kms *dpu_kms,
  void dpu_vbif_set_qos_remap(struct dpu_kms *dpu_kms,
  		struct dpu_vbif_set_qos_params *params)
  {
-	struct dpu_hw_vbif *vbif = NULL;
+	struct dpu_hw_vbif *vbif;
  	struct dpu_hw_mdp *mdp;
  	bool forced_on = false;
  	const struct dpu_vbif_qos_tbl *qos_tbl;
@@ -216,13 +219,7 @@ void dpu_vbif_set_qos_remap(struct dpu_kms *dpu_kms,
  	}
  	mdp = dpu_kms->hw_mdp;
- for (i = 0; i < ARRAY_SIZE(dpu_kms->hw_vbif); i++) {
-		if (dpu_kms->hw_vbif[i] &&
-				dpu_kms->hw_vbif[i]->idx == params->vbif_idx) {
-			vbif = dpu_kms->hw_vbif[i];
-			break;
-		}
-	}
+	vbif = dpu_get_vbif(dpu_kms, params->vbif_idx);
if (!vbif || !vbif->cap) {
  		DPU_ERROR("invalid vbif %d\n", params->vbif_idx);



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