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

Removes some checks from dpu_plane.c that will never result in an error.
Subsequent variable assignments become part of the initialization wherever
possible. Unused variables are removed.

v3: removed additional impossible checks and called helper function
_dpu_plane_get_kms() where possible.

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_plane.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
index c17ab05..6329ad2 100644 (file)
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
@@ -125,13 +125,8 @@ struct dpu_plane {
 
 static struct dpu_kms *_dpu_plane_get_kms(struct drm_plane *plane)
 {
-       struct msm_drm_private *priv;
+       struct msm_drm_private *priv = plane->dev->dev_private;
 
-       if (!plane || !plane->dev)
-               return NULL;
-       priv = plane->dev->dev_private;
-       if (!priv)
-               return NULL;
        return to_dpu_kms(priv->kms);
 }
 
@@ -150,7 +145,7 @@ static inline int _dpu_plane_calc_fill_level(struct drm_plane *plane,
        u32 fixed_buff_size;
        u32 total_fl;
 
-       if (!plane || !fmt || !plane->state || !src_width || !fmt->bpp) {
+       if (!fmt || !plane->state || !src_width || !fmt->bpp) {
                DPU_ERROR("invalid arguments\n");
                return 0;
        }
@@ -231,26 +226,11 @@ static u64 _dpu_plane_get_qos_lut(const struct dpu_qos_lut_tbl *tbl,
 static void _dpu_plane_set_qos_lut(struct drm_plane *plane,
                struct drm_framebuffer *fb)
 {
-       struct dpu_plane *pdpu;
+       struct dpu_plane *pdpu = to_dpu_plane(plane);
        const struct dpu_format *fmt = NULL;
        u64 qos_lut;
        u32 total_fl = 0, lut_usage;
 
-       if (!plane || !fb) {
-               DPU_ERROR("invalid arguments plane %d fb %d\n",
-                               plane != 0, fb != 0);
-               return;
-       }
-
-       pdpu = to_dpu_plane(plane);
-
-       if (!pdpu->pipe_hw || !pdpu->pipe_sblk || !pdpu->catalog) {
-               DPU_ERROR("invalid arguments\n");
-               return;
-       } else if (!pdpu->pipe_hw->ops.setup_creq_lut) {
-               return;
-       }
-
        if (!pdpu->is_rt_pipe) {
                lut_usage = DPU_QOS_LUT_USAGE_NRT;
        } else {
@@ -292,24 +272,10 @@ static void _dpu_plane_set_qos_lut(struct drm_plane *plane,
 static void _dpu_plane_set_danger_lut(struct drm_plane *plane,
                struct drm_framebuffer *fb)
 {
-       struct dpu_plane *pdpu;
+       struct dpu_plane *pdpu = to_dpu_plane(plane);
        const struct dpu_format *fmt = NULL;
        u32 danger_lut, safe_lut;
 
-       if (!plane || !fb) {
-               DPU_ERROR("invalid arguments\n");
-               return;
-       }
-
-       pdpu = to_dpu_plane(plane);
-
-       if (!pdpu->pipe_hw || !pdpu->pipe_sblk || !pdpu->catalog) {
-               DPU_ERROR("invalid arguments\n");
-               return;
-       } else if (!pdpu->pipe_hw->ops.setup_danger_safe_lut) {
-               return;
-       }
-
        if (!pdpu->is_rt_pipe) {
                danger_lut = pdpu->catalog->perf.danger_lut_tbl
                                [DPU_QOS_LUT_USAGE_NRT];
@@ -363,21 +329,7 @@ static void _dpu_plane_set_danger_lut(struct drm_plane *plane,
 static void _dpu_plane_set_qos_ctrl(struct drm_plane *plane,
        bool enable, u32 flags)
 {
-       struct dpu_plane *pdpu;
-
-       if (!plane) {
-               DPU_ERROR("invalid arguments\n");
-               return;
-       }
-
-       pdpu = to_dpu_plane(plane);
-
-       if (!pdpu->pipe_hw || !pdpu->pipe_sblk) {
-               DPU_ERROR("invalid arguments\n");
-               return;
-       } else if (!pdpu->pipe_hw->ops.setup_qos_ctrl) {
-               return;
-       }
+       struct dpu_plane *pdpu = to_dpu_plane(plane);
 
        if (flags & DPU_PLANE_QOS_VBLANK_CTRL) {
                pdpu->pipe_qos_cfg.creq_vblank = pdpu->pipe_sblk->creq_vblank;
@@ -452,29 +404,9 @@ end:
 static void _dpu_plane_set_ot_limit(struct drm_plane *plane,
                struct drm_crtc *crtc)
 {
-       struct dpu_plane *pdpu;
+       struct dpu_plane *pdpu = to_dpu_plane(plane);
        struct dpu_vbif_set_ot_params ot_params;
-       struct msm_drm_private *priv;
-       struct dpu_kms *dpu_kms;
-
-       if (!plane || !plane->dev || !crtc) {
-               DPU_ERROR("invalid arguments plane %d crtc %d\n",
-                               plane != 0, crtc != 0);
-               return;
-       }
-
-       priv = plane->dev->dev_private;
-       if (!priv || !priv->kms) {
-               DPU_ERROR("invalid KMS reference\n");
-               return;
-       }
-
-       dpu_kms = to_dpu_kms(priv->kms);
-       pdpu = to_dpu_plane(plane);
-       if (!pdpu->pipe_hw) {
-               DPU_ERROR("invalid pipe reference\n");
-               return;
-       }
+       struct dpu_kms *dpu_kms = _dpu_plane_get_kms(plane);
 
        memset(&ot_params, 0, sizeof(ot_params));
        ot_params.xin_id = pdpu->pipe_hw->cap->xin_id;
@@ -496,28 +428,9 @@ static void _dpu_plane_set_ot_limit(struct drm_plane *plane,
  */
 static void _dpu_plane_set_qos_remap(struct drm_plane *plane)
 {
-       struct dpu_plane *pdpu;
+       struct dpu_plane *pdpu = to_dpu_plane(plane);
        struct dpu_vbif_set_qos_params qos_params;
-       struct msm_drm_private *priv;
-       struct dpu_kms *dpu_kms;
-
-       if (!plane || !plane->dev) {
-               DPU_ERROR("invalid arguments\n");
-               return;
-       }
-
-       priv = plane->dev->dev_private;
-       if (!priv || !priv->kms) {
-               DPU_ERROR("invalid KMS reference\n");
-               return;
-       }
-
-       dpu_kms = to_dpu_kms(priv->kms);
-       pdpu = to_dpu_plane(plane);
-       if (!pdpu->pipe_hw) {
-               DPU_ERROR("invalid pipe reference\n");
-               return;
-       }
+       struct dpu_kms *dpu_kms = _dpu_plane_get_kms(plane);
 
        memset(&qos_params, 0, sizeof(qos_params));
        qos_params.vbif_idx = VBIF_RT;
@@ -551,10 +464,6 @@ static int _dpu_plane_get_aspace(
        }
 
        kms = _dpu_plane_get_kms(&pdpu->base);
-       if (!kms) {
-               DPU_ERROR("invalid kms\n");
-               return -EINVAL;
-       }
 
        *aspace = kms->base.aspace;
 
@@ -566,23 +475,10 @@ static inline void _dpu_plane_set_scanout(struct drm_plane *plane,
                struct dpu_hw_pipe_cfg *pipe_cfg,
                struct drm_framebuffer *fb)
 {
-       struct dpu_plane *pdpu;
+       struct dpu_plane *pdpu = to_dpu_plane(plane);
        struct msm_gem_address_space *aspace = NULL;
        int ret;
 
-       if (!plane || !pstate || !pipe_cfg || !fb) {
-               DPU_ERROR(
-                       "invalid arg(s), plane %d state %d cfg %d fb %d\n",
-                       plane != 0, pstate != 0, pipe_cfg != 0, fb != 0);
-               return;
-       }
-
-       pdpu = to_dpu_plane(plane);
-       if (!pdpu->pipe_hw) {
-               DPU_ERROR_PLANE(pdpu, "invalid pipe_hw\n");
-               return;
-       }
-
        ret = _dpu_plane_get_aspace(pdpu, pstate, &aspace);
        if (ret) {
                DPU_ERROR_PLANE(pdpu, "Failed to get aspace %d\n", ret);
@@ -612,15 +508,6 @@ static void _dpu_plane_setup_scaler3(struct dpu_plane *pdpu,
 {
        uint32_t i;
 
-       if (!pdpu || !pstate || !scale_cfg || !fmt || !chroma_subsmpl_h ||
-                       !chroma_subsmpl_v) {
-               DPU_ERROR(
-                       "pdpu %d pstate %d scale_cfg %d fmt %d smp_h %d smp_v %d\n",
-                       !!pdpu, !!pstate, !!scale_cfg, !!fmt, chroma_subsmpl_h,
-                       chroma_subsmpl_v);
-               return;
-       }
-
        memset(scale_cfg, 0, sizeof(*scale_cfg));
        memset(&pstate->pixel_ext, 0, sizeof(struct dpu_hw_pixel_ext));
 
@@ -724,17 +611,8 @@ static void _dpu_plane_setup_scaler(struct dpu_plane *pdpu,
                struct dpu_plane_state *pstate,
                const struct dpu_format *fmt, bool color_fill)
 {
-       struct dpu_hw_pixel_ext *pe;
        uint32_t chroma_subsmpl_h, chroma_subsmpl_v;
 
-       if (!pdpu || !fmt || !pstate) {
-               DPU_ERROR("invalid arg(s), plane %d fmt %d state %d\n",
-                               pdpu != 0, fmt != 0, pstate != 0);
-               return;
-       }
-
-       pe = &pstate->pixel_ext;
-
        /* don't chroma subsample if decimating */
        chroma_subsmpl_h =
                drm_format_horz_chroma_subsampling(fmt->base.pixel_format);
@@ -762,21 +640,8 @@ static int _dpu_plane_color_fill(struct dpu_plane *pdpu,
                uint32_t color, uint32_t alpha)
 {
        const struct dpu_format *fmt;
-       const struct drm_plane *plane;
-       struct dpu_plane_state *pstate;
-
-       if (!pdpu || !pdpu->base.state) {
-               DPU_ERROR("invalid plane\n");
-               return -EINVAL;
-       }
-
-       if (!pdpu->pipe_hw) {
-               DPU_ERROR_PLANE(pdpu, "invalid plane h/w pointer\n");
-               return -EINVAL;
-       }
-
-       plane = &pdpu->base;
-       pstate = to_dpu_plane_state(plane->state);
+       const struct drm_plane *plane = &pdpu->base;
+       struct dpu_plane_state *pstate = to_dpu_plane_state(plane->state);
 
        DPU_DEBUG_PLANE(pdpu, "\n");
 
@@ -827,12 +692,7 @@ static int _dpu_plane_color_fill(struct dpu_plane *pdpu,
 
 void dpu_plane_clear_multirect(const struct drm_plane_state *drm_state)
 {
-       struct dpu_plane_state *pstate;
-
-       if (!drm_state)
-               return;
-
-       pstate = to_dpu_plane_state(drm_state);
+       struct dpu_plane_state *pstate = to_dpu_plane_state(drm_state);
 
        pstate->multirect_index = DPU_SSPP_RECT_SOLO;
        pstate->multirect_mode = DPU_SSPP_MULTIRECT_NONE;
@@ -963,15 +823,6 @@ done:
 void dpu_plane_get_ctl_flush(struct drm_plane *plane, struct dpu_hw_ctl *ctl,
                u32 *flush_sspp)
 {
-       struct dpu_plane_state *pstate;
-
-       if (!plane || !flush_sspp) {
-               DPU_ERROR("invalid parameters\n");
-               return;
-       }
-
-       pstate = to_dpu_plane_state(plane->state);
-
        *flush_sspp = ctl->ops.get_bitmask_sspp(ctl, dpu_plane_pipe(plane));
 }
 
@@ -1391,8 +1242,7 @@ static void dpu_plane_destroy(struct drm_plane *plane)
                /* this will destroy the states as well */
                drm_plane_cleanup(plane);
 
-               if (pdpu->pipe_hw)
-                       dpu_hw_sspp_destroy(pdpu->pipe_hw);
+               dpu_hw_sspp_destroy(pdpu->pipe_hw);
 
                kfree(pdpu);
        }
@@ -1739,33 +1589,11 @@ struct drm_plane *dpu_plane_init(struct drm_device *dev,
        struct drm_plane *plane = NULL, *master_plane = NULL;
        const struct dpu_format_extended *format_list;
        struct dpu_plane *pdpu;
-       struct msm_drm_private *priv;
-       struct dpu_kms *kms;
+       struct msm_drm_private *priv = dev->dev_private;
+       struct dpu_kms *kms = to_dpu_kms(priv->kms);
        int zpos_max = DPU_ZPOS_MAX;
        int ret = -EINVAL;
 
-       if (!dev) {
-               DPU_ERROR("[%u]device is NULL\n", pipe);
-               goto exit;
-       }
-
-       priv = dev->dev_private;
-       if (!priv) {
-               DPU_ERROR("[%u]private data is NULL\n", pipe);
-               goto exit;
-       }
-
-       if (!priv->kms) {
-               DPU_ERROR("[%u]invalid KMS reference\n", pipe);
-               goto exit;
-       }
-       kms = to_dpu_kms(priv->kms);
-
-       if (!kms->catalog) {
-               DPU_ERROR("[%u]invalid catalog reference\n", pipe);
-               goto exit;
-       }
-
        /* create and zero local structure */
        pdpu = kzalloc(sizeof(*pdpu), GFP_KERNEL);
        if (!pdpu) {