[PATCH 1/6] drm/msm/dpu: Remove unused variables

[PATCH 1/6] drm/msm/dpu: Remove unused variables

[Drew Davenport]

Signed-off-by: Drew Davenport <ddavenport@chromium.org>
---

 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c    | 5 -----
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 7 -------
 2 files changed, 12 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index ce59adff06aa..2ece11262943 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -1288,13 +1288,8 @@ struct drm_crtc *dpu_crtc_init(struct drm_device *dev, struct drm_plane *plane,
 {
 	struct drm_crtc *crtc = NULL;
 	struct dpu_crtc *dpu_crtc = NULL;
-	struct msm_drm_private *priv = NULL;
-	struct dpu_kms *kms = NULL;
 	int i;
 
-	priv = dev->dev_private;
-	kms = to_dpu_kms(priv->kms);
-
 	dpu_crtc = kzalloc(sizeof(*dpu_crtc), GFP_KERNEL);
 	if (!dpu_crtc)
 		return ERR_PTR(-ENOMEM);
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index d82ea994063f..4d2cacd0ce3d 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -1914,8 +1914,6 @@ static int _dpu_encoder_debugfs_status_open(struct inode *inode,
 static int _dpu_encoder_init_debugfs(struct drm_encoder *drm_enc)
 {
 	struct dpu_encoder_virt *dpu_enc = to_dpu_encoder_virt(drm_enc);
-	struct msm_drm_private *priv;
-	struct dpu_kms *dpu_kms;
 	int i;
 
 	static const struct file_operations debugfs_status_fops = {
@@ -1932,9 +1930,6 @@ static int _dpu_encoder_init_debugfs(struct drm_encoder *drm_enc)
 		return -EINVAL;
 	}
 
-	priv = drm_enc->dev->dev_private;
-	dpu_kms = to_dpu_kms(priv->kms);
-
 	snprintf(name, DPU_NAME_SIZE, "encoder%u", drm_enc->base.id);
 
 	/* create overall sub-directory for the encoder */
@@ -2133,14 +2128,12 @@ static void dpu_encoder_frame_done_timeout(struct timer_list *t)
 	struct dpu_encoder_virt *dpu_enc = from_timer(dpu_enc, t,
 			frame_done_timer);
 	struct drm_encoder *drm_enc = &dpu_enc->base;
-	struct msm_drm_private *priv;
 	u32 event;
 
 	if (!drm_enc->dev || !drm_enc->dev->dev_private) {
 		DPU_ERROR("invalid parameters\n");
 		return;
 	}
-	priv = drm_enc->dev->dev_private;
 
 	if (!dpu_enc->frame_busy_mask[0] || !dpu_enc->crtc_frame_event_cb) {
 		DRM_DEBUG_KMS("id:%u invalid timeout frame_busy_mask=%lu\n",
-- 
2.20.1

[PATCH 2/6] drm/msm/dpu: Remove unused macro

[Drew Davenport]

Signed-off-by: Drew Davenport <ddavenport@chromium.org>
---

 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
index 4c889aabdaf9..6ceba33a179e 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
@@ -139,10 +139,6 @@ struct vsync_info {
 
 #define to_dpu_kms(x) container_of(x, struct dpu_kms, base)
 
-/* get struct msm_kms * from drm_device * */
-#define ddev_to_msm_kms(D) ((D) && (D)->dev_private ? \
-		((struct msm_drm_private *)((D)->dev_private))->kms : NULL)
-
 /**
  * Debugfs functions - extra helper functions for debugfs support
  *
-- 
2.20.1

[PATCH 3/6] drm/msm/dpu: Remove unnecessary NULL checks

[Drew Davenport]

drm_device.dev_private is set to a non-NULL msm_drm_private
struct in msm_drm_init. Successful initialization of msm means
that dev_private is non-NULL so there is no need to check it
everywhere.

Signed-off-by: Drew Davenport <ddavenport@chromium.org>
---

 drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c     |  6 ------
 drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c    |  4 ++--
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c         |  4 ++--
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c      | 15 +++++----------
 .../gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c |  2 +-
 .../gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c |  3 +--
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c          | 16 +++-------------
 7 files changed, 14 insertions(+), 36 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c
index cdbea38b8697..17f917b718ce 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c
@@ -349,9 +349,6 @@ void dpu_core_irq_preinstall(struct dpu_kms *dpu_kms)
 	if (!dpu_kms->dev) {
 		DPU_ERROR("invalid drm device\n");
 		return;
-	} else if (!dpu_kms->dev->dev_private) {
-		DPU_ERROR("invalid device private\n");
-		return;
 	}
 	priv = dpu_kms->dev->dev_private;
 
@@ -385,9 +382,6 @@ void dpu_core_irq_uninstall(struct dpu_kms *dpu_kms)
 	if (!dpu_kms->dev) {
 		DPU_ERROR("invalid drm device\n");
 		return;
-	} else if (!dpu_kms->dev->dev_private) {
-		DPU_ERROR("invalid device private\n");
-		return;
 	}
 	priv = dpu_kms->dev->dev_private;
 
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
index 09a49b59bb5b..094d74635fb7 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
@@ -33,13 +33,13 @@ static struct dpu_kms *_dpu_crtc_get_kms(struct drm_crtc *crtc)
 {
 	struct msm_drm_private *priv;
 
-	if (!crtc->dev || !crtc->dev->dev_private) {
+	if (!crtc->dev) {
 		DPU_ERROR("invalid device\n");
 		return NULL;
 	}
 
 	priv = crtc->dev->dev_private;
-	if (!priv || !priv->kms) {
+	if (!priv->kms) {
 		DPU_ERROR("invalid kms\n");
 		return NULL;
 	}
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index 2ece11262943..ead7d657097c 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -694,7 +694,7 @@ static void dpu_crtc_disable(struct drm_crtc *crtc,
 	unsigned long flags;
 	bool release_bandwidth = false;
 
-	if (!crtc || !crtc->dev || !crtc->dev->dev_private || !crtc->state) {
+	if (!crtc || !crtc->dev || !crtc->state) {
 		DPU_ERROR("invalid crtc\n");
 		return;
 	}
@@ -766,7 +766,7 @@ static void dpu_crtc_enable(struct drm_crtc *crtc,
 	struct msm_drm_private *priv;
 	bool request_bandwidth;
 
-	if (!crtc || !crtc->dev || !crtc->dev->dev_private) {
+	if (!crtc || !crtc->dev) {
 		DPU_ERROR("invalid crtc\n");
 		return;
 	}
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 4d2cacd0ce3d..7b37d1eeeab5 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -735,8 +735,7 @@ static int dpu_encoder_resource_control(struct drm_encoder *drm_enc,
 	struct msm_drm_private *priv;
 	bool is_vid_mode = false;
 
-	if (!drm_enc || !drm_enc->dev || !drm_enc->dev->dev_private ||
-			!drm_enc->crtc) {
+	if (!drm_enc || !drm_enc->dev || !drm_enc->crtc) {
 		DPU_ERROR("invalid parameters\n");
 		return -EINVAL;
 	}
@@ -1092,7 +1091,7 @@ static void _dpu_encoder_virt_enable_helper(struct drm_encoder *drm_enc)
 	struct msm_drm_private *priv;
 	struct dpu_kms *dpu_kms;
 
-	if (!drm_enc || !drm_enc->dev || !drm_enc->dev->dev_private) {
+	if (!drm_enc || !drm_enc->dev) {
 		DPU_ERROR("invalid parameters\n");
 		return;
 	}
@@ -1193,9 +1192,6 @@ static void dpu_encoder_virt_disable(struct drm_encoder *drm_enc)
 	} else if (!drm_enc->dev) {
 		DPU_ERROR("invalid dev\n");
 		return;
-	} else if (!drm_enc->dev->dev_private) {
-		DPU_ERROR("invalid dev_private\n");
-		return;
 	}
 
 	dpu_enc = to_dpu_encoder_virt(drm_enc);
@@ -1734,8 +1730,7 @@ static void dpu_encoder_vsync_event_handler(struct timer_list *t)
 	struct msm_drm_private *priv;
 	struct msm_drm_thread *event_thread;
 
-	if (!drm_enc->dev || !drm_enc->dev->dev_private ||
-			!drm_enc->crtc) {
+	if (!drm_enc->dev || !drm_enc->crtc) {
 		DPU_ERROR("invalid parameters\n");
 		return;
 	}
@@ -1925,7 +1920,7 @@ static int _dpu_encoder_init_debugfs(struct drm_encoder *drm_enc)
 
 	char name[DPU_NAME_SIZE];
 
-	if (!drm_enc->dev || !drm_enc->dev->dev_private) {
+	if (!drm_enc->dev) {
 		DPU_ERROR("invalid encoder or kms\n");
 		return -EINVAL;
 	}
@@ -2130,7 +2125,7 @@ static void dpu_encoder_frame_done_timeout(struct timer_list *t)
 	struct drm_encoder *drm_enc = &dpu_enc->base;
 	u32 event;
 
-	if (!drm_enc->dev || !drm_enc->dev->dev_private) {
+	if (!drm_enc->dev) {
 		DPU_ERROR("invalid parameters\n");
 		return;
 	}
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
index 2923b63d95fe..50fe1ed7095c 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
@@ -373,7 +373,7 @@ static void dpu_encoder_phys_cmd_tearcheck_config(
 	}
 
 	dpu_kms = phys_enc->dpu_kms;
-	if (!dpu_kms || !dpu_kms->dev || !dpu_kms->dev->dev_private) {
+	if (!dpu_kms || !dpu_kms->dev) {
 		DPU_ERROR("invalid device\n");
 		return;
 	}
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
index b9c84fb4d4a1..bd333d957add 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
@@ -570,8 +570,7 @@ static void dpu_encoder_phys_vid_disable(struct dpu_encoder_phys *phys_enc)
 	unsigned long lock_flags;
 	int ret;
 
-	if (!phys_enc || !phys_enc->parent || !phys_enc->parent->dev ||
-			!phys_enc->parent->dev->dev_private) {
+	if (!phys_enc || !phys_enc->parent || !phys_enc->parent->dev) {
 		DPU_ERROR("invalid encoder/device\n");
 		return;
 	}
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index 58b0485dc375..4a69d8ecf5e1 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -72,7 +72,7 @@ static int _dpu_danger_signal_status(struct seq_file *s,
 	struct dpu_danger_safe_status status;
 	int i;
 
-	if (!kms->dev || !kms->dev->dev_private || !kms->hw_mdp) {
+	if (!kms->dev || !kms->hw_mdp) {
 		DPU_ERROR("invalid arg(s)\n");
 		return 0;
 	}
@@ -157,9 +157,6 @@ static int _dpu_debugfs_show_regset32(struct seq_file *s, void *data)
 		return 0;
 
 	priv = dev->dev_private;
-	if (!priv)
-		return 0;
-
 	base = dpu_kms->mmio + regset->offset;
 
 	/* insert padding spaces, if needed */
@@ -292,7 +289,7 @@ static void dpu_kms_prepare_commit(struct msm_kms *kms,
 	dpu_kms = to_dpu_kms(kms);
 	dev = dpu_kms->dev;
 
-	if (!dev || !dev->dev_private)
+	if (!dev)
 		return;
 	priv = dev->dev_private;
 
@@ -470,9 +467,6 @@ static void _dpu_kms_drm_obj_destroy(struct dpu_kms *dpu_kms)
 	} else if (!dpu_kms->dev) {
 		DPU_ERROR("invalid dev\n");
 		return;
-	} else if (!dpu_kms->dev->dev_private) {
-		DPU_ERROR("invalid dev_private\n");
-		return;
 	}
 	priv = dpu_kms->dev->dev_private;
 
@@ -809,10 +803,6 @@ static int dpu_kms_hw_init(struct msm_kms *kms)
 	}
 
 	priv = dev->dev_private;
-	if (!priv) {
-		DPU_ERROR("invalid private data\n");
-		return rc;
-	}
 
 	atomic_set(&dpu_kms->bandwidth_ref, 0);
 
@@ -974,7 +964,7 @@ struct msm_kms *dpu_kms_init(struct drm_device *dev)
 	struct dpu_kms *dpu_kms;
 	int irq;
 
-	if (!dev || !dev->dev_private) {
+	if (!dev) {
 		DPU_ERROR("drm device node invalid\n");
 		return ERR_PTR(-EINVAL);
 	}
-- 
2.20.1

[PATCH 4/6] drm/msm/dpu: Remove unnecessary NULL checks

[Drew Davenport]

drm_crtc.dev will never be NULL, so no need to check it.

Signed-off-by: Drew Davenport <ddavenport@chromium.org>
---

 drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c | 5 -----
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c      | 6 +++---
 2 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
index 094d74635fb7..839887a3a80c 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
@@ -33,11 +33,6 @@ static struct dpu_kms *_dpu_crtc_get_kms(struct drm_crtc *crtc)
 {
 	struct msm_drm_private *priv;
 
-	if (!crtc->dev) {
-		DPU_ERROR("invalid device\n");
-		return NULL;
-	}
-
 	priv = crtc->dev->dev_private;
 	if (!priv->kms) {
 		DPU_ERROR("invalid kms\n");
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index ead7d657097c..0b9dc042d2e2 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -266,7 +266,7 @@ enum dpu_intf_mode dpu_crtc_get_intf_mode(struct drm_crtc *crtc)
 {
 	struct drm_encoder *encoder;
 
-	if (!crtc || !crtc->dev) {
+	if (!crtc) {
 		DPU_ERROR("invalid crtc\n");
 		return INTF_MODE_NONE;
 	}
@@ -694,7 +694,7 @@ static void dpu_crtc_disable(struct drm_crtc *crtc,
 	unsigned long flags;
 	bool release_bandwidth = false;
 
-	if (!crtc || !crtc->dev || !crtc->state) {
+	if (!crtc || !crtc->state) {
 		DPU_ERROR("invalid crtc\n");
 		return;
 	}
@@ -766,7 +766,7 @@ static void dpu_crtc_enable(struct drm_crtc *crtc,
 	struct msm_drm_private *priv;
 	bool request_bandwidth;
 
-	if (!crtc || !crtc->dev) {
+	if (!crtc) {
 		DPU_ERROR("invalid crtc\n");
 		return;
 	}
-- 
2.20.1

[PATCH 5/6] drm/msm/dpu: Remove unnecessary NULL checks

[Drew Davenport]

msm_drm_private.kms will only be NULL in the dummy headless case, so
there is no need to check it in the dpu display driver.

Signed-off-by: Drew Davenport <ddavenport@chromium.org>
---

 drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c  | 23 ++++++++-----------
 drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c | 12 +++-------
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c   | 14 ++---------
 .../drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c  |  2 +-
 .../drm/msm/disp/dpu1/dpu_encoder_phys_vid.c  |  2 +-
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c       |  5 +---
 drivers/gpu/drm/msm/disp/dpu1/dpu_vbif.c      |  6 +----
 7 files changed, 19 insertions(+), 45 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c
index 17f917b718ce..a53517abf15c 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c
@@ -55,8 +55,7 @@ static void dpu_core_irq_callback_handler(void *arg, int irq_idx)
 int dpu_core_irq_idx_lookup(struct dpu_kms *dpu_kms,
 		enum dpu_intr_type intr_type, u32 instance_idx)
 {
-	if (!dpu_kms || !dpu_kms->hw_intr ||
-			!dpu_kms->hw_intr->ops.irq_idx_lookup)
+	if (!dpu_kms->hw_intr || !dpu_kms->hw_intr->ops.irq_idx_lookup)
 		return -EINVAL;
 
 	return dpu_kms->hw_intr->ops.irq_idx_lookup(intr_type,
@@ -73,7 +72,7 @@ static int _dpu_core_irq_enable(struct dpu_kms *dpu_kms, int irq_idx)
 	unsigned long irq_flags;
 	int ret = 0, enable_count;
 
-	if (!dpu_kms || !dpu_kms->hw_intr ||
+	if (!dpu_kms->hw_intr ||
 			!dpu_kms->irq_obj.enable_counts ||
 			!dpu_kms->irq_obj.irq_counts) {
 		DPU_ERROR("invalid params\n");
@@ -114,7 +113,7 @@ int dpu_core_irq_enable(struct dpu_kms *dpu_kms, int *irq_idxs, u32 irq_count)
 {
 	int i, ret = 0, counts;
 
-	if (!dpu_kms || !irq_idxs || !irq_count) {
+	if (!irq_idxs || !irq_count) {
 		DPU_ERROR("invalid params\n");
 		return -EINVAL;
 	}
@@ -138,7 +137,7 @@ static int _dpu_core_irq_disable(struct dpu_kms *dpu_kms, int irq_idx)
 {
 	int ret = 0, enable_count;
 
-	if (!dpu_kms || !dpu_kms->hw_intr || !dpu_kms->irq_obj.enable_counts) {
+	if (!dpu_kms->hw_intr || !dpu_kms->irq_obj.enable_counts) {
 		DPU_ERROR("invalid params\n");
 		return -EINVAL;
 	}
@@ -169,7 +168,7 @@ int dpu_core_irq_disable(struct dpu_kms *dpu_kms, int *irq_idxs, u32 irq_count)
 {
 	int i, ret = 0, counts;
 
-	if (!dpu_kms || !irq_idxs || !irq_count) {
+	if (!irq_idxs || !irq_count) {
 		DPU_ERROR("invalid params\n");
 		return -EINVAL;
 	}
@@ -186,7 +185,7 @@ int dpu_core_irq_disable(struct dpu_kms *dpu_kms, int *irq_idxs, u32 irq_count)
 
 u32 dpu_core_irq_read(struct dpu_kms *dpu_kms, int irq_idx, bool clear)
 {
-	if (!dpu_kms || !dpu_kms->hw_intr ||
+	if (!dpu_kms->hw_intr ||
 			!dpu_kms->hw_intr->ops.get_interrupt_status)
 		return 0;
 
@@ -205,7 +204,7 @@ int dpu_core_irq_register_callback(struct dpu_kms *dpu_kms, int irq_idx,
 {
 	unsigned long irq_flags;
 
-	if (!dpu_kms || !dpu_kms->irq_obj.irq_cb_tbl) {
+	if (!dpu_kms->irq_obj.irq_cb_tbl) {
 		DPU_ERROR("invalid params\n");
 		return -EINVAL;
 	}
@@ -240,7 +239,7 @@ int dpu_core_irq_unregister_callback(struct dpu_kms *dpu_kms, int irq_idx,
 {
 	unsigned long irq_flags;
 
-	if (!dpu_kms || !dpu_kms->irq_obj.irq_cb_tbl) {
+	if (!dpu_kms->irq_obj.irq_cb_tbl) {
 		DPU_ERROR("invalid params\n");
 		return -EINVAL;
 	}
@@ -274,8 +273,7 @@ int dpu_core_irq_unregister_callback(struct dpu_kms *dpu_kms, int irq_idx,
 
 static void dpu_clear_all_irqs(struct dpu_kms *dpu_kms)
 {
-	if (!dpu_kms || !dpu_kms->hw_intr ||
-			!dpu_kms->hw_intr->ops.clear_all_irqs)
+	if (!dpu_kms->hw_intr || !dpu_kms->hw_intr->ops.clear_all_irqs)
 		return;
 
 	dpu_kms->hw_intr->ops.clear_all_irqs(dpu_kms->hw_intr);
@@ -283,8 +281,7 @@ static void dpu_clear_all_irqs(struct dpu_kms *dpu_kms)
 
 static void dpu_disable_all_irqs(struct dpu_kms *dpu_kms)
 {
-	if (!dpu_kms || !dpu_kms->hw_intr ||
-			!dpu_kms->hw_intr->ops.disable_all_irqs)
+	if (!dpu_kms->hw_intr || !dpu_kms->hw_intr->ops.disable_all_irqs)
 		return;
 
 	dpu_kms->hw_intr->ops.disable_all_irqs(dpu_kms->hw_intr);
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
index 839887a3a80c..e96843010dff 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
@@ -32,13 +32,7 @@ enum dpu_perf_mode {
 static struct dpu_kms *_dpu_crtc_get_kms(struct drm_crtc *crtc)
 {
 	struct msm_drm_private *priv;
-
 	priv = crtc->dev->dev_private;
-	if (!priv->kms) {
-		DPU_ERROR("invalid kms\n");
-		return NULL;
-	}
-
 	return to_dpu_kms(priv->kms);
 }
 
@@ -111,7 +105,7 @@ int dpu_core_perf_crtc_check(struct drm_crtc *crtc,
 	}
 
 	kms = _dpu_crtc_get_kms(crtc);
-	if (!kms || !kms->catalog) {
+	if (!kms->catalog) {
 		DPU_ERROR("invalid parameters\n");
 		return 0;
 	}
@@ -219,7 +213,7 @@ void dpu_core_perf_crtc_release_bw(struct drm_crtc *crtc)
 	}
 
 	kms = _dpu_crtc_get_kms(crtc);
-	if (!kms || !kms->catalog) {
+	if (!kms->catalog) {
 		DPU_ERROR("invalid kms\n");
 		return;
 	}
@@ -292,7 +286,7 @@ int dpu_core_perf_crtc_update(struct drm_crtc *crtc,
 	}
 
 	kms = _dpu_crtc_get_kms(crtc);
-	if (!kms || !kms->catalog) {
+	if (!kms->catalog) {
 		DPU_ERROR("invalid kms\n");
 		return -EINVAL;
 	}
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 7b37d1eeeab5..85e7bacbce42 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -645,11 +645,6 @@ static void _dpu_encoder_update_vsync_source(struct dpu_encoder_virt *dpu_enc,
 	priv = drm_enc->dev->dev_private;
 
 	dpu_kms = to_dpu_kms(priv->kms);
-	if (!dpu_kms) {
-		DPU_ERROR("invalid dpu_kms\n");
-		return;
-	}
-
 	hw_mdptop = dpu_kms->hw_mdp;
 	if (!hw_mdptop) {
 		DPU_ERROR("invalid mdptop\n");
@@ -1098,10 +1093,6 @@ static void _dpu_encoder_virt_enable_helper(struct drm_encoder *drm_enc)
 
 	priv = drm_enc->dev->dev_private;
 	dpu_kms = to_dpu_kms(priv->kms);
-	if (!dpu_kms) {
-		DPU_ERROR("invalid dpu_kms\n");
-		return;
-	}
 
 	dpu_enc = to_dpu_encoder_virt(drm_enc);
 	if (!dpu_enc || !dpu_enc->cur_master) {
@@ -2032,9 +2023,8 @@ static int dpu_encoder_setup_display(struct dpu_encoder_virt *dpu_enc,
 	enum dpu_intf_type intf_type;
 	struct dpu_enc_phys_init_params phys_params;
 
-	if (!dpu_enc || !dpu_kms) {
-		DPU_ERROR("invalid arg(s), enc %d kms %d\n",
-				dpu_enc != 0, dpu_kms != 0);
+	if (!dpu_enc) {
+		DPU_ERROR("invalid arg(s), enc %d\n", dpu_enc != 0);
 		return -EINVAL;
 	}
 
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
index 50fe1ed7095c..39fc39cd2439 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
@@ -373,7 +373,7 @@ static void dpu_encoder_phys_cmd_tearcheck_config(
 	}
 
 	dpu_kms = phys_enc->dpu_kms;
-	if (!dpu_kms || !dpu_kms->dev) {
+	if (!dpu_kms->dev) {
 		DPU_ERROR("invalid device\n");
 		return;
 	}
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
index bd333d957add..15d21d7ec304 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
@@ -374,7 +374,7 @@ static void dpu_encoder_phys_vid_mode_set(
 		struct drm_display_mode *mode,
 		struct drm_display_mode *adj_mode)
 {
-	if (!phys_enc || !phys_enc->dpu_kms) {
+	if (!phys_enc) {
 		DPU_ERROR("invalid encoder/kms\n");
 		return;
 	}
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index 4a69d8ecf5e1..9d6429fa6229 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -461,10 +461,7 @@ static void _dpu_kms_drm_obj_destroy(struct dpu_kms *dpu_kms)
 	struct msm_drm_private *priv;
 	int i;
 
-	if (!dpu_kms) {
-		DPU_ERROR("invalid dpu_kms\n");
-		return;
-	} else if (!dpu_kms->dev) {
+	if (!dpu_kms->dev) {
 		DPU_ERROR("invalid dev\n");
 		return;
 	}
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_vbif.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_vbif.c
index 8d24b79fd400..991f4c8f8a12 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_vbif.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_vbif.c
@@ -154,10 +154,6 @@ void dpu_vbif_set_ot_limit(struct dpu_kms *dpu_kms,
 	u32 ot_lim;
 	int ret, i;
 
-	if (!dpu_kms) {
-		DPU_ERROR("invalid arguments\n");
-		return;
-	}
 	mdp = dpu_kms->hw_mdp;
 
 	for (i = 0; i < ARRAY_SIZE(dpu_kms->hw_vbif); i++) {
@@ -214,7 +210,7 @@ void dpu_vbif_set_qos_remap(struct dpu_kms *dpu_kms,
 	const struct dpu_vbif_qos_tbl *qos_tbl;
 	int i;
 
-	if (!dpu_kms || !params || !dpu_kms->hw_mdp) {
+	if (!params || !dpu_kms->hw_mdp) {
 		DPU_ERROR("invalid arguments\n");
 		return;
 	}
-- 
2.20.1

[PATCH 6/6] drm/msm/dpu: Remove unnecessary NULL checks

[Drew Davenport]

dpu_kms.dev will never be NULL, so don't bother checking.

Signed-off-by: Drew Davenport <ddavenport@chromium.org>
---

 drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c  |  8 -----
 .../drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c  |  4 ---
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c       | 30 +------------------
 3 files changed, 1 insertion(+), 41 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c
index a53517abf15c..283d5a48fd13 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c
@@ -343,10 +343,6 @@ void dpu_core_irq_preinstall(struct dpu_kms *dpu_kms)
 	struct msm_drm_private *priv;
 	int i;
 
-	if (!dpu_kms->dev) {
-		DPU_ERROR("invalid drm device\n");
-		return;
-	}
 	priv = dpu_kms->dev->dev_private;
 
 	pm_runtime_get_sync(&dpu_kms->pdev->dev);
@@ -376,10 +372,6 @@ void dpu_core_irq_uninstall(struct dpu_kms *dpu_kms)
 	struct msm_drm_private *priv;
 	int i;
 
-	if (!dpu_kms->dev) {
-		DPU_ERROR("invalid drm device\n");
-		return;
-	}
 	priv = dpu_kms->dev->dev_private;
 
 	pm_runtime_get_sync(&dpu_kms->pdev->dev);
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
index 39fc39cd2439..d5532836b5b9 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
@@ -373,10 +373,6 @@ static void dpu_encoder_phys_cmd_tearcheck_config(
 	}
 
 	dpu_kms = phys_enc->dpu_kms;
-	if (!dpu_kms->dev) {
-		DPU_ERROR("invalid device\n");
-		return;
-	}
 	priv = dpu_kms->dev->dev_private;
 
 	/*
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index 9d6429fa6229..fbb154d7c81c 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -72,7 +72,7 @@ static int _dpu_danger_signal_status(struct seq_file *s,
 	struct dpu_danger_safe_status status;
 	int i;
 
-	if (!kms->dev || !kms->hw_mdp) {
+	if (!kms->hw_mdp) {
 		DPU_ERROR("invalid arg(s)\n");
 		return 0;
 	}
@@ -153,9 +153,6 @@ static int _dpu_debugfs_show_regset32(struct seq_file *s, void *data)
 		return 0;
 
 	dev = dpu_kms->dev;
-	if (!dev)
-		return 0;
-
 	priv = dev->dev_private;
 	base = dpu_kms->mmio + regset->offset;
 
@@ -288,9 +285,6 @@ static void dpu_kms_prepare_commit(struct msm_kms *kms,
 		return;
 	dpu_kms = to_dpu_kms(kms);
 	dev = dpu_kms->dev;
-
-	if (!dev)
-		return;
 	priv = dev->dev_private;
 
 	/* Call prepare_commit for all affected encoders */
@@ -461,10 +455,6 @@ static void _dpu_kms_drm_obj_destroy(struct dpu_kms *dpu_kms)
 	struct msm_drm_private *priv;
 	int i;
 
-	if (!dpu_kms->dev) {
-		DPU_ERROR("invalid dev\n");
-		return;
-	}
 	priv = dpu_kms->dev->dev_private;
 
 	for (i = 0; i < priv->num_crtcs; i++)
@@ -496,7 +486,6 @@ static int _dpu_kms_drm_obj_init(struct dpu_kms *dpu_kms)
 
 	int primary_planes_idx = 0, cursor_planes_idx = 0, i, ret;
 	int max_crtc_count;
-
 	dev = dpu_kms->dev;
 	priv = dev->dev_private;
 	catalog = dpu_kms->catalog;
@@ -576,8 +565,6 @@ static void _dpu_kms_hw_destroy(struct dpu_kms *dpu_kms)
 	int i;
 
 	dev = dpu_kms->dev;
-	if (!dev)
-		return;
 
 	if (dpu_kms->hw_intr)
 		dpu_hw_intr_destroy(dpu_kms->hw_intr);
@@ -794,11 +781,6 @@ static int dpu_kms_hw_init(struct msm_kms *kms)
 
 	dpu_kms = to_dpu_kms(kms);
 	dev = dpu_kms->dev;
-	if (!dev) {
-		DPU_ERROR("invalid device\n");
-		return rc;
-	}
-
 	priv = dev->dev_private;
 
 	atomic_set(&dpu_kms->bandwidth_ref, 0);
@@ -1051,11 +1033,6 @@ static int __maybe_unused dpu_runtime_suspend(struct device *dev)
 	struct dss_module_power *mp = &dpu_kms->mp;
 
 	ddev = dpu_kms->dev;
-	if (!ddev) {
-		DPU_ERROR("invalid drm_device\n");
-		return rc;
-	}
-
 	rc = msm_dss_enable_clk(mp->clk_config, mp->num_clk, false);
 	if (rc)
 		DPU_ERROR("clock disable failed rc:%d\n", rc);
@@ -1073,11 +1050,6 @@ static int __maybe_unused dpu_runtime_resume(struct device *dev)
 	struct dss_module_power *mp = &dpu_kms->mp;
 
 	ddev = dpu_kms->dev;
-	if (!ddev) {
-		DPU_ERROR("invalid drm_device\n");
-		return rc;
-	}
-
 	rc = msm_dss_enable_clk(mp->clk_config, mp->num_clk, true);
 	if (rc) {
 		DPU_ERROR("clock enable failed rc:%d\n", rc);
-- 
2.20.1

[PATCH 1/6] drm/msm/dpu: Remove unnecessary NULL checks

[Drew Davenport]

dpu_hw_ctl* is checked for NULL when passed as an argument
to several functions. It will never be NULL, so remove the
checks.

Signed-off-by: Drew Davenport <ddavenport@chromium.org>
---

 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c          | 10 ++++------
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c | 12 ++++++------
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c |  8 +++-----
 3 files changed, 13 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index f96e142c4361..45a87757e766 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -1419,7 +1419,7 @@ static void _dpu_encoder_trigger_flush(struct drm_encoder *drm_enc,
 	}
 
 	ctl = phys->hw_ctl;
-	if (!ctl || !ctl->ops.trigger_flush) {
+	if (!ctl->ops.trigger_flush) {
 		DPU_ERROR("missing trigger cb\n");
 		return;
 	}
@@ -1469,7 +1469,7 @@ void dpu_encoder_helper_trigger_start(struct dpu_encoder_phys *phys_enc)
 	}
 
 	ctl = phys_enc->hw_ctl;
-	if (ctl && ctl->ops.trigger_start) {
+	if (ctl->ops.trigger_start) {
 		ctl->ops.trigger_start(ctl);
 		trace_dpu_enc_trigger_start(DRMID(phys_enc->parent), ctl->idx);
 	}
@@ -1513,7 +1513,7 @@ static void dpu_encoder_helper_hw_reset(struct dpu_encoder_phys *phys_enc)
 	dpu_enc = to_dpu_encoder_virt(phys_enc->parent);
 	ctl = phys_enc->hw_ctl;
 
-	if (!ctl || !ctl->ops.reset)
+	if (!ctl->ops.reset)
 		return;
 
 	DRM_DEBUG_KMS("id:%u ctl %d reset\n", DRMID(phys_enc->parent),
@@ -1554,8 +1554,6 @@ static void _dpu_encoder_kickoff_phys(struct dpu_encoder_virt *dpu_enc)
 			continue;
 
 		ctl = phys->hw_ctl;
-		if (!ctl)
-			continue;
 
 		/*
 		 * This is cleared in frame_done worker, which isn't invoked
@@ -1603,7 +1601,7 @@ void dpu_encoder_trigger_kickoff_pending(struct drm_encoder *drm_enc)
 	for (i = 0; i < dpu_enc->num_phys_encs; i++) {
 		phys = dpu_enc->phys_encs[i];
 
-		if (phys && phys->hw_ctl) {
+		if (phys) {
 			ctl = phys->hw_ctl;
 			if (ctl->ops.clear_pending_flush)
 				ctl->ops.clear_pending_flush(ctl);
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
index 047960949fbb..cfd01b0ac7f1 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
@@ -62,7 +62,7 @@ static void _dpu_encoder_phys_cmd_update_intf_cfg(
 		return;
 
 	ctl = phys_enc->hw_ctl;
-	if (!ctl || !ctl->ops.setup_intf_cfg)
+	if (!ctl->ops.setup_intf_cfg)
 		return;
 
 	intf_cfg.intf = phys_enc->intf_idx;
@@ -125,7 +125,7 @@ static void dpu_encoder_phys_cmd_ctl_start_irq(void *arg, int irq_idx)
 {
 	struct dpu_encoder_phys *phys_enc = arg;
 
-	if (!phys_enc || !phys_enc->hw_ctl)
+	if (!phys_enc)
 		return;
 
 	DPU_ATRACE_BEGIN("ctl_start_irq");
@@ -198,7 +198,7 @@ static int _dpu_encoder_phys_cmd_handle_ppdone_timeout(
 	u32 frame_event = DPU_ENCODER_FRAME_EVENT_ERROR;
 	bool do_log = false;
 
-	if (!phys_enc || !phys_enc->hw_pp || !phys_enc->hw_ctl)
+	if (!phys_enc || !phys_enc->hw_pp)
 		return -EINVAL;
 
 	cmd_enc->pp_timeout_report_cnt++;
@@ -428,7 +428,7 @@ static void _dpu_encoder_phys_cmd_pingpong_config(
 	struct dpu_encoder_phys_cmd *cmd_enc =
 		to_dpu_encoder_phys_cmd(phys_enc);
 
-	if (!phys_enc || !phys_enc->hw_ctl || !phys_enc->hw_pp
+	if (!phys_enc || !phys_enc->hw_pp
 			|| !phys_enc->hw_ctl->ops.setup_intf_cfg) {
 		DPU_ERROR("invalid arg(s), enc %d\n", phys_enc != 0);
 		return;
@@ -458,7 +458,7 @@ static void dpu_encoder_phys_cmd_enable_helper(
 	struct dpu_hw_ctl *ctl;
 	u32 flush_mask = 0;
 
-	if (!phys_enc || !phys_enc->hw_ctl || !phys_enc->hw_pp) {
+	if (!phys_enc || !phys_enc->hw_pp) {
 		DPU_ERROR("invalid arg(s), encoder %d\n", phys_enc != 0);
 		return;
 	}
@@ -614,7 +614,7 @@ static int _dpu_encoder_phys_cmd_wait_for_ctl_start(
 	struct dpu_encoder_wait_info wait_info;
 	int ret;
 
-	if (!phys_enc || !phys_enc->hw_ctl) {
+	if (!phys_enc) {
 		DPU_ERROR("invalid argument(s)\n");
 		return -EINVAL;
 	}
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
index 3123ef873cdf..2252475dd8dc 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
@@ -297,8 +297,6 @@ static void dpu_encoder_phys_vid_vblank_irq(void *arg, int irq_idx)
 		return;
 
 	hw_ctl = phys_enc->hw_ctl;
-	if (!hw_ctl)
-		return;
 
 	DPU_ATRACE_BEGIN("vblank_irq");
 
@@ -314,7 +312,7 @@ static void dpu_encoder_phys_vid_vblank_irq(void *arg, int irq_idx)
 	 * so we need to double-check with hw that it accepted the flush bits
 	 */
 	spin_lock_irqsave(phys_enc->enc_spinlock, lock_flags);
-	if (hw_ctl && hw_ctl->ops.get_flush_register)
+	if (hw_ctl->ops.get_flush_register)
 		flush_register = hw_ctl->ops.get_flush_register(hw_ctl);
 
 	if (!(flush_register & hw_ctl->ops.get_pending_flush(hw_ctl)))
@@ -549,7 +547,7 @@ static void dpu_encoder_phys_vid_prepare_for_kickoff(
 	}
 
 	ctl = phys_enc->hw_ctl;
-	if (!ctl || !ctl->ops.wait_reset_status)
+	if (!ctl->ops.wait_reset_status)
 		return;
 
 	/*
@@ -574,7 +572,7 @@ static void dpu_encoder_phys_vid_disable(struct dpu_encoder_phys *phys_enc)
 		return;
 	}
 
-	if (!phys_enc->hw_intf || !phys_enc->hw_ctl) {
+	if (!phys_enc->hw_intf) {
 		DPU_ERROR("invalid hw_intf %d hw_ctl %d\n",
 				phys_enc->hw_intf != 0, phys_enc->hw_ctl != 0);
 		return;
-- 
2.21.0

[PATCH 3/6] drm/msm/dpu: Remove unnecessary NULL checks

[Drew Davenport]

dpu_crtc_mixer.hw_lm will never be NULL, so don't check.

Signed-off-by: Drew Davenport <ddavenport@chromium.org>
---

 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index b9ed8285ab39..bf513411b243 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -197,10 +197,6 @@ static void _dpu_crtc_blend_setup(struct drm_crtc *crtc)
 	DPU_DEBUG("%s\n", dpu_crtc->name);
 
 	for (i = 0; i < cstate->num_mixers; i++) {
-		if (!mixer[i].hw_lm) {
-			DPU_ERROR("invalid lm assigned to mixer\n");
-			return;
-		}
 		mixer[i].mixer_op_mode = 0;
 		mixer[i].flush_mask = 0;
 		if (mixer[i].lm_ctl->ops.clear_all_blendstages)
@@ -1113,12 +1109,9 @@ static int _dpu_debugfs_status_show(struct seq_file *s, void *data)
 
 	for (i = 0; i < cstate->num_mixers; ++i) {
 		m = &cstate->mixers[i];
-		if (!m->hw_lm)
-			seq_printf(s, "\tmixer[%d] has no lm\n", i);
-		else
-			seq_printf(s, "\tmixer:%d ctl:%d width:%d height:%d\n",
-				m->hw_lm->idx - LM_0, m->lm_ctl->idx - CTL_0,
-				out_width, mode->vdisplay);
+		seq_printf(s, "\tmixer:%d ctl:%d width:%d height:%d\n",
+			m->hw_lm->idx - LM_0, m->lm_ctl->idx - CTL_0,
+			out_width, mode->vdisplay);
 	}
 
 	seq_puts(s, "\n");
-- 
2.21.0