Re: [PATCH v5 08/12] drm/msm/dpu: split dpu_plane_atomic_check()

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On Wed, 28 Aug 2024 at 21:27, Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx> wrote:
>
>
>
> On 6/26/2024 2:46 PM, Dmitry Baryshkov wrote:
> > Split dpu_plane_atomic_check() function into two pieces:
> >
> > dpu_plane_atomic_check_nopipe() performing generic checks on the pstate,
> > without touching the associated pipe,
> >
> > and
> >
> > dpu_plane_atomic_check_pipes(), which takes into account used pipes.
> >
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
> > ---
> >   drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c | 178 +++++++++++++++++++-----------
> >   1 file changed, 112 insertions(+), 66 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
> > index 115c1bd77bdd..9b9fe28052ad 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
> > @@ -788,49 +788,22 @@ static int dpu_plane_atomic_check_pipe(struct dpu_plane *pdpu,
> >   #define MAX_UPSCALE_RATIO   20
> >   #define MAX_DOWNSCALE_RATIO 4
> >
> > -static int dpu_plane_atomic_check(struct drm_plane *plane,
> > -                               struct drm_atomic_state *state)
> > +static int dpu_plane_atomic_check_nopipe(struct drm_plane *plane,
> > +                                      struct drm_plane_state *new_plane_state,
> > +                                      const struct drm_crtc_state *crtc_state)
> >   {
> > -     struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state,
> > -                                                                              plane);
> >       int ret = 0, min_scale, max_scale;
> >       struct dpu_plane *pdpu = to_dpu_plane(plane);
> >       struct dpu_kms *kms = _dpu_plane_get_kms(&pdpu->base);
> >       u64 max_mdp_clk_rate = kms->perf.max_core_clk_rate;
> >       struct dpu_plane_state *pstate = to_dpu_plane_state(new_plane_state);
> > -     struct dpu_sw_pipe *pipe = &pstate->pipe;
> > -     struct dpu_sw_pipe *r_pipe = &pstate->r_pipe;
> > -     const struct drm_crtc_state *crtc_state = NULL;
> > -     const struct msm_format *fmt;
> >       struct dpu_sw_pipe_cfg *pipe_cfg = &pstate->pipe_cfg;
> >       struct dpu_sw_pipe_cfg *r_pipe_cfg = &pstate->r_pipe_cfg;
> >       struct drm_rect fb_rect = { 0 };
> >       uint32_t max_linewidth;
> > -     unsigned int rotation;
> > -     uint32_t supported_rotations;
> > -     const struct dpu_sspp_cfg *pipe_hw_caps;
> > -     const struct dpu_sspp_sub_blks *sblk;
> > -
> > -     if (new_plane_state->crtc)
> > -             crtc_state = drm_atomic_get_new_crtc_state(state,
> > -                                                        new_plane_state->crtc);
> > -
> > -     pipe->sspp = dpu_rm_get_sspp(&kms->rm, pdpu->pipe);
> > -     r_pipe->sspp = NULL;
> >
> > -     if (!pipe->sspp)
> > -             return -EINVAL;
> > -
> > -     pipe_hw_caps = pipe->sspp->cap;
> > -     sblk = pipe->sspp->cap->sblk;
> > -
> > -     if (sblk->scaler_blk.len) {
> > -             min_scale = FRAC_16_16(1, MAX_UPSCALE_RATIO);
> > -             max_scale = MAX_DOWNSCALE_RATIO << 16;
> > -     } else {
> > -             min_scale = DRM_PLANE_NO_SCALING;
> > -             max_scale = DRM_PLANE_NO_SCALING;
> > -     }
> > +     min_scale = FRAC_16_16(1, MAX_UPSCALE_RATIO);
> > +     max_scale = MAX_DOWNSCALE_RATIO << 16;
> >
> >       ret = drm_atomic_helper_check_plane_state(new_plane_state, crtc_state,
> >                                                 min_scale,
> > @@ -843,11 +816,6 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
> >       if (!new_plane_state->visible)
> >               return 0;
> >
> > -     pipe->multirect_index = DPU_SSPP_RECT_SOLO;
> > -     pipe->multirect_mode = DPU_SSPP_MULTIRECT_NONE;
> > -     r_pipe->multirect_index = DPU_SSPP_RECT_SOLO;
> > -     r_pipe->multirect_mode = DPU_SSPP_MULTIRECT_NONE;
> > -
> >       pstate->stage = DPU_STAGE_0 + pstate->base.normalized_zpos;
> >       if (pstate->stage >= pdpu->catalog->caps->max_mixer_blendstages) {
> >               DPU_ERROR("> %d plane stages assigned\n",
> > @@ -871,8 +839,6 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
> >               return -E2BIG;
> >       }
> >
> > -     fmt = msm_framebuffer_format(new_plane_state->fb);
> > -
> >       max_linewidth = pdpu->catalog->caps->max_linewidth;
> >
> >       drm_rect_rotate(&pipe_cfg->src_rect,
> > @@ -881,6 +847,78 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
> >
> >       if ((drm_rect_width(&pipe_cfg->src_rect) > max_linewidth) ||
> >            _dpu_plane_calc_clk(&crtc_state->adjusted_mode, pipe_cfg) > max_mdp_clk_rate) {
> > +             if (drm_rect_width(&pipe_cfg->src_rect) > 2 * max_linewidth) {
> > +                     DPU_DEBUG_PLANE(pdpu, "invalid src " DRM_RECT_FMT " line:%u\n",
> > +                                     DRM_RECT_ARG(&pipe_cfg->src_rect), max_linewidth);
> > +                     return -E2BIG;
> > +             }
> > +
> > +             *r_pipe_cfg = *pipe_cfg;
> > +             pipe_cfg->src_rect.x2 = (pipe_cfg->src_rect.x1 + pipe_cfg->src_rect.x2) >> 1;
> > +             pipe_cfg->dst_rect.x2 = (pipe_cfg->dst_rect.x1 + pipe_cfg->dst_rect.x2) >> 1;
> > +             r_pipe_cfg->src_rect.x1 = pipe_cfg->src_rect.x2;
> > +             r_pipe_cfg->dst_rect.x1 = pipe_cfg->dst_rect.x2;
> > +     } else {
> > +             memset(r_pipe_cfg, 0, sizeof(*r_pipe_cfg));
> > +     }
> > +
>
> This is the part I am not able to fully understand. Assignment of
> r_pipe_cfg is also pipe related so why should that move to
> dpu_plane_atomic_check_nopipe(). It should be part of
> dpu_plane_atomic_check_pipe().

Because it happens before possible pipe / rectangle allocation. These
values are further used to assign resources.

>
> > +     drm_rect_rotate_inv(&pipe_cfg->src_rect,
> > +                         new_plane_state->fb->width, new_plane_state->fb->height,
> > +                         new_plane_state->rotation);
> > +     if (r_pipe_cfg->src_rect.x1 != 0)
> > +             drm_rect_rotate_inv(&r_pipe_cfg->src_rect,
> > +                                 new_plane_state->fb->width, new_plane_state->fb->height,
> > +                                 new_plane_state->rotation);
> > +
> > +     pstate->needs_qos_remap = drm_atomic_crtc_needs_modeset(crtc_state);
> > +
> > +     return 0;
> > +}
> > +
> > +static int dpu_plane_atomic_check_pipes(struct drm_plane *plane,
> > +                                     struct drm_atomic_state *state,
> > +                                     const struct drm_crtc_state *crtc_state)
> > +{
> > +     struct drm_plane_state *new_plane_state =
> > +             drm_atomic_get_new_plane_state(state, plane);
> > +     struct dpu_plane *pdpu = to_dpu_plane(plane);
> > +     struct dpu_plane_state *pstate = to_dpu_plane_state(new_plane_state);
> > +     struct dpu_sw_pipe *pipe = &pstate->pipe;
> > +     struct dpu_sw_pipe *r_pipe = &pstate->r_pipe;
> > +     const struct msm_format *fmt;
> > +     struct dpu_sw_pipe_cfg *pipe_cfg = &pstate->pipe_cfg;
> > +     struct dpu_sw_pipe_cfg *r_pipe_cfg = &pstate->r_pipe_cfg;
> > +     uint32_t max_linewidth;
> > +     unsigned int rotation;
> > +     uint32_t supported_rotations;
> > +     const struct dpu_sspp_cfg *pipe_hw_caps;
> > +     const struct dpu_sspp_sub_blks *sblk;
> > +     int ret = 0;
> > +
> > +     pipe_hw_caps = pipe->sspp->cap;
> > +     sblk = pipe->sspp->cap->sblk;
> > +
> > +     /*
> > +      * We already have verified scaling against platform limitations.
> > +      * Now check if the SSPP supports scaling at all.
> > +      */
> > +     if (!sblk->scaler_blk.len &&
> > +         ((drm_rect_width(&new_plane_state->src) >> 16 !=
> > +           drm_rect_width(&new_plane_state->dst)) ||
> > +          (drm_rect_height(&new_plane_state->src) >> 16 !=
> > +           drm_rect_height(&new_plane_state->dst))))
> > +             return -ERANGE;
> > +
>
> Should this part be retained under dpu_plane_atomic_check_nopipe()?
>
> This is also not pipe dependent.

No, it uses sblk->scaler_blk, so it depends on the actual SSPP being
used for this pipe.

>
> > +     fmt = msm_framebuffer_format(new_plane_state->fb);
> > +
> > +     max_linewidth = pdpu->catalog->caps->max_linewidth;
> > +
> > +     ret = dpu_plane_atomic_check_pipe(pdpu, pipe, pipe_cfg, fmt,
> > +                                       &crtc_state->adjusted_mode);
> > +     if (ret)
> > +             return ret;
> > +
> > +     if (drm_rect_width(&r_pipe_cfg->src_rect) != 0) {
> >               /*
> >                * In parallel multirect case only the half of the usual width
> >                * is supported for tiled formats. If we are here, we know that
> > @@ -894,12 +932,6 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
> >                       return -E2BIG;
> >               }
> >
> > -             if (drm_rect_width(&pipe_cfg->src_rect) > 2 * max_linewidth) {
> > -                     DPU_DEBUG_PLANE(pdpu, "invalid src " DRM_RECT_FMT " line:%u\n",
> > -                                     DRM_RECT_ARG(&pipe_cfg->src_rect), max_linewidth);
> > -                     return -E2BIG;
> > -             }
> > -
> >               if (drm_rect_width(&pipe_cfg->src_rect) != drm_rect_width(&pipe_cfg->dst_rect) ||
> >                   drm_rect_height(&pipe_cfg->src_rect) != drm_rect_height(&pipe_cfg->dst_rect) ||
> >                   (!test_bit(DPU_SSPP_SMART_DMA_V1, &pipe->sspp->cap->features) &&
> > @@ -921,26 +953,6 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
> >               r_pipe->multirect_index = DPU_SSPP_RECT_1;
> >               r_pipe->multirect_mode = DPU_SSPP_MULTIRECT_PARALLEL;
> >
> > -             *r_pipe_cfg = *pipe_cfg;
> > -             pipe_cfg->src_rect.x2 = (pipe_cfg->src_rect.x1 + pipe_cfg->src_rect.x2) >> 1;
> > -             pipe_cfg->dst_rect.x2 = (pipe_cfg->dst_rect.x1 + pipe_cfg->dst_rect.x2) >> 1;
> > -             r_pipe_cfg->src_rect.x1 = pipe_cfg->src_rect.x2;
> > -             r_pipe_cfg->dst_rect.x1 = pipe_cfg->dst_rect.x2;
> > -     }
> > -
> > -     drm_rect_rotate_inv(&pipe_cfg->src_rect,
> > -                         new_plane_state->fb->width, new_plane_state->fb->height,
> > -                         new_plane_state->rotation);
> > -     if (r_pipe->sspp)
> > -             drm_rect_rotate_inv(&r_pipe_cfg->src_rect,
> > -                                 new_plane_state->fb->width, new_plane_state->fb->height,
> > -                                 new_plane_state->rotation);
> > -
> > -     ret = dpu_plane_atomic_check_pipe(pdpu, pipe, pipe_cfg, fmt, &crtc_state->adjusted_mode);
> > -     if (ret)
> > -             return ret;
> > -
> > -     if (r_pipe->sspp) {
> >               ret = dpu_plane_atomic_check_pipe(pdpu, r_pipe, r_pipe_cfg, fmt,
> >                                                 &crtc_state->adjusted_mode);
> >               if (ret)
> > @@ -963,11 +975,45 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
> >       }
> >
> >       pstate->rotation = rotation;
>
> The dpu_plane_check_inline_rotation() is also pipe independent. So even
> that goes to dpu_plane_atomic_check_nopipe()?

It also depends on the sblk if I remember correctly. Also note that
the next patch moves it to check_pipe().

>
> > -     pstate->needs_qos_remap = drm_atomic_crtc_needs_modeset(crtc_state);
> >
> >       return 0;
> >   }
> >
>
> <snip>
>


-- 
With best wishes
Dmitry




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