drm/msm/dpu: Remove unneeded checks in dpu_crtc.c

Removes impossible checks in dpu_crtc.c.
Variable assignments are moved up to be initializations where
possible. Some variables are no longer used, these are removed.

v3: reverted back to original patch

Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Bruce Wang <bzwang@chromium.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index a8f2dd7..e31e70f 100644 (file)
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -55,17 +55,7 @@ static inline int _dpu_crtc_get_mixer_width(struct dpu_crtc_state *cstate,
 
 static inline struct dpu_kms *_dpu_crtc_get_kms(struct drm_crtc *crtc)
 {
-       struct msm_drm_private *priv;
-
-       if (!crtc || !crtc->dev || !crtc->dev->dev_private) {
-               DPU_ERROR("invalid crtc\n");
-               return NULL;
-       }
-       priv = crtc->dev->dev_private;
-       if (!priv || !priv->kms) {
-               DPU_ERROR("invalid kms\n");
-               return NULL;
-       }
+       struct msm_drm_private *priv = crtc->dev->dev_private;
 
        return to_dpu_kms(priv->kms);
 }
@@ -177,28 +167,17 @@ static void _dpu_crtc_blend_setup_mixer(struct drm_crtc *crtc,
        struct drm_plane *plane;
        struct drm_framebuffer *fb;
        struct drm_plane_state *state;
-       struct dpu_crtc_state *cstate;
+       struct dpu_crtc_state *cstate = to_dpu_crtc_state(crtc->state);
        struct dpu_plane_state *pstate = NULL;
        struct dpu_format *format;
-       struct dpu_hw_ctl *ctl;
-       struct dpu_hw_mixer *lm;
-       struct dpu_hw_stage_cfg *stage_cfg;
+       struct dpu_hw_ctl *ctl = mixer->lm_ctl;
+       struct dpu_hw_stage_cfg *stage_cfg = &dpu_crtc->stage_cfg;
 
        u32 flush_mask;
        uint32_t stage_idx, lm_idx;
        int zpos_cnt[DPU_STAGE_MAX + 1] = { 0 };
        bool bg_alpha_enable = false;
 
-       if (!dpu_crtc || !mixer) {
-               DPU_ERROR("invalid dpu_crtc or mixer\n");
-               return;
-       }
-
-       ctl = mixer->lm_ctl;
-       lm = mixer->hw_lm;
-       stage_cfg = &dpu_crtc->stage_cfg;
-       cstate = to_dpu_crtc_state(crtc->state);
-
        drm_atomic_crtc_for_each_plane(plane, crtc) {
                state = plane->state;
                if (!state)
@@ -217,10 +196,6 @@ static void _dpu_crtc_blend_setup_mixer(struct drm_crtc *crtc,
                                state->fb ? state->fb->base.id : -1);
 
                format = to_dpu_format(msm_framebuffer_format(pstate->base.fb));
-               if (!format) {
-                       DPU_ERROR("invalid format\n");
-                       return;
-               }
 
                if (pstate->stage == DPU_STAGE_BASE && format->alpha_enable)
                        bg_alpha_enable = true;
@@ -261,21 +236,13 @@ static void _dpu_crtc_blend_setup_mixer(struct drm_crtc *crtc,
  */
 static void _dpu_crtc_blend_setup(struct drm_crtc *crtc)
 {
-       struct dpu_crtc *dpu_crtc;
-       struct dpu_crtc_state *cstate;
-       struct dpu_crtc_mixer *mixer;
+       struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
+       struct dpu_crtc_state *cstate = to_dpu_crtc_state(crtc->state);
+       struct dpu_crtc_mixer *mixer = cstate->mixers;
        struct dpu_hw_ctl *ctl;
        struct dpu_hw_mixer *lm;
-
        int i;
 
-       if (!crtc)
-               return;
-
-       dpu_crtc = to_dpu_crtc(crtc);
-       cstate = to_dpu_crtc_state(crtc->state);
-       mixer = cstate->mixers;
-
        DPU_DEBUG("%s\n", dpu_crtc->name);
 
        for (i = 0; i < cstate->num_mixers; i++) {
@@ -377,34 +344,13 @@ static void dpu_crtc_vblank_cb(void *data)
 
 static void dpu_crtc_frame_event_work(struct kthread_work *work)
 {
-       struct msm_drm_private *priv;
-       struct dpu_crtc_frame_event *fevent;
-       struct drm_crtc *crtc;
-       struct dpu_crtc *dpu_crtc;
-       struct dpu_kms *dpu_kms;
+       struct dpu_crtc_frame_event *fevent = container_of(work,
+                       struct dpu_crtc_frame_event, work);
+       struct drm_crtc *crtc = fevent->crtc;
+       struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
        unsigned long flags;
        bool frame_done = false;
 
-       if (!work) {
-               DPU_ERROR("invalid work handle\n");
-               return;
-       }
-
-       fevent = container_of(work, struct dpu_crtc_frame_event, work);
-       if (!fevent->crtc || !fevent->crtc->state) {
-               DPU_ERROR("invalid crtc\n");
-               return;
-       }
-
-       crtc = fevent->crtc;
-       dpu_crtc = to_dpu_crtc(crtc);
-
-       dpu_kms = _dpu_crtc_get_kms(crtc);
-       if (!dpu_kms) {
-               DPU_ERROR("invalid kms handle\n");
-               return;
-       }
-       priv = dpu_kms->dev->dev_private;
        DPU_ATRACE_BEGIN("crtc_frame_event");
 
        DRM_DEBUG_KMS("crtc%d event:%u ts:%lld\n", crtc->base.id, fevent->event,
@@ -470,11 +416,6 @@ static void dpu_crtc_frame_event_cb(void *data, u32 event)
        unsigned long flags;
        u32 crtc_id;
 
-       if (!crtc || !crtc->dev || !crtc->dev->dev_private) {
-               DPU_ERROR("invalid parameters\n");
-               return;
-       }
-
        /* Nothing to do on idle event */
        if (event & DPU_ENCODER_FRAME_EVENT_IDLE)
                return;
@@ -583,23 +524,12 @@ static void _dpu_crtc_setup_mixers(struct drm_crtc *crtc)
 static void _dpu_crtc_setup_lm_bounds(struct drm_crtc *crtc,
                struct drm_crtc_state *state)
 {
-       struct dpu_crtc *dpu_crtc;
-       struct dpu_crtc_state *cstate;
-       struct drm_display_mode *adj_mode;
-       u32 crtc_split_width;
+       struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
+       struct dpu_crtc_state *cstate = to_dpu_crtc_state(state);
+       struct drm_display_mode *adj_mode = &state->adjusted_mode;
+       u32 crtc_split_width = _dpu_crtc_get_mixer_width(cstate, adj_mode);
        int i;
 
-       if (!crtc || !state) {
-               DPU_ERROR("invalid args\n");
-               return;
-       }
-
-       dpu_crtc = to_dpu_crtc(crtc);
-       cstate = to_dpu_crtc_state(state);
-
-       adj_mode = &state->adjusted_mode;
-       crtc_split_width = _dpu_crtc_get_mixer_width(cstate, adj_mode);
-
        for (i = 0; i < cstate->num_mixers; i++) {
                struct drm_rect *r = &cstate->lm_bounds[i];
                r->x1 = crtc_split_width * i;
@@ -693,11 +623,6 @@ static void dpu_crtc_atomic_flush(struct drm_crtc *crtc,
        unsigned long flags;
        struct dpu_crtc_state *cstate;
 
-       if (!crtc || !crtc->dev || !crtc->dev->dev_private) {
-               DPU_ERROR("invalid crtc\n");
-               return;
-       }
-
        if (!crtc->state->enable) {
                DPU_DEBUG("crtc%d -> enable %d, skip atomic_flush\n",
                                crtc->base.id, crtc->state->enable);
@@ -790,15 +715,9 @@ static void dpu_crtc_destroy_state(struct drm_crtc *crtc,
 
 static int _dpu_crtc_wait_for_frame_done(struct drm_crtc *crtc)
 {
-       struct dpu_crtc *dpu_crtc;
+       struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
        int ret, rc = 0;
 
-       if (!crtc) {
-               DPU_ERROR("invalid argument\n");
-               return -EINVAL;
-       }
-       dpu_crtc = to_dpu_crtc(crtc);
-
        if (!atomic_read(&dpu_crtc->frame_pending)) {
                DPU_DEBUG("no frames pending\n");
                return 0;
@@ -819,29 +738,12 @@ static int _dpu_crtc_wait_for_frame_done(struct drm_crtc *crtc)
 void dpu_crtc_commit_kickoff(struct drm_crtc *crtc)
 {
        struct drm_encoder *encoder;
-       struct drm_device *dev;
-       struct dpu_crtc *dpu_crtc;
-       struct msm_drm_private *priv;
-       struct dpu_kms *dpu_kms;
-       struct dpu_crtc_state *cstate;
+       struct drm_device *dev = crtc->dev;
+       struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
+       struct dpu_kms *dpu_kms = _dpu_crtc_get_kms(crtc);
+       struct dpu_crtc_state *cstate = to_dpu_crtc_state(crtc->state);
        int ret;
 
-       if (!crtc) {
-               DPU_ERROR("invalid argument\n");
-               return;
-       }
-       dev = crtc->dev;
-       dpu_crtc = to_dpu_crtc(crtc);
-       dpu_kms = _dpu_crtc_get_kms(crtc);
-
-       if (!dpu_kms || !dpu_kms->dev || !dpu_kms->dev->dev_private) {
-               DPU_ERROR("invalid argument\n");
-               return;
-       }
-
-       priv = dpu_kms->dev->dev_private;
-       cstate = to_dpu_crtc_state(crtc->state);
-
        /*
         * If no mixers has been allocated in dpu_crtc_atomic_check(),
         * it means we are trying to start a CRTC whose state is disabled:
@@ -969,24 +871,9 @@ static int _dpu_crtc_vblank_enable_no_lock(
  */
 static void _dpu_crtc_set_suspend(struct drm_crtc *crtc, bool enable)
 {
-       struct dpu_crtc *dpu_crtc;
-       struct msm_drm_private *priv;
-       struct dpu_kms *dpu_kms;
+       struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
        int ret = 0;
 
-       if (!crtc || !crtc->dev || !crtc->dev->dev_private) {
-               DPU_ERROR("invalid crtc\n");
-               return;
-       }
-       dpu_crtc = to_dpu_crtc(crtc);
-       priv = crtc->dev->dev_private;
-
-       if (!priv->kms) {
-               DPU_ERROR("invalid crtc kms\n");
-               return;
-       }
-       dpu_kms = to_dpu_kms(priv->kms);
-
        DRM_DEBUG_KMS("crtc%d suspend = %d\n", crtc->base.id, enable);
 
        mutex_lock(&dpu_crtc->crtc_lock);
@@ -1079,16 +966,8 @@ static void dpu_crtc_reset(struct drm_crtc *crtc)
 static void dpu_crtc_handle_power_event(u32 event_type, void *arg)
 {
        struct drm_crtc *crtc = arg;
-       struct dpu_crtc *dpu_crtc;
+       struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
        struct drm_encoder *encoder;
-       struct dpu_crtc_state *cstate;
-
-       if (!crtc) {
-               DPU_ERROR("invalid crtc\n");
-               return;
-       }
-       dpu_crtc = to_dpu_crtc(crtc);
-       cstate = to_dpu_crtc_state(dpu_crtc->base.state);
 
        mutex_lock(&dpu_crtc->crtc_lock);
 
@@ -1673,8 +1552,6 @@ static int _dpu_crtc_init_debugfs(struct drm_crtc *crtc)
        dpu_crtc = to_dpu_crtc(crtc);
 
        dpu_kms = _dpu_crtc_get_kms(crtc);
-       if (!dpu_kms)
-               return -EINVAL;
 
        dpu_crtc->debugfs_root = debugfs_create_dir(dpu_crtc->name,
                        crtc->dev->primary->debugfs_root);