[PATCH v6 13/15] drm/msm/dpu: support SSPP assignment for quad-pipe case

[Jun Nie]

Dmitry Baryshkov <dmitry.baryshkov at linaro.org> 于2025年2月22日周六 00:36写道：
>
> On Mon, Feb 17, 2025 at 10:16:02PM +0800, Jun Nie wrote:
> > Currently, SSPPs are assigned to a maximum of two pipes. However,
> > quad-pipe usage scenarios require four pipes and involve configuring
> > two stages. In quad-pipe case, the first two pipes share a set of
> > mixer configurations and enable multi-rect mode when certain
> > conditions are met. The same applies to the subsequent two pipes.
> >
> > Assign SSPPs to the pipes in each stage using a unified method and
> > to loop the stages accordingly.
> >
> > Signed-off-by: Jun Nie <jun.nie at linaro.org>
> > ---
> >  drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c | 63 +++++++++++++++++++------------
> >  1 file changed, 39 insertions(+), 24 deletions(-)
> >
> > +     for (stage_id = 0; stage_id < num_stages; stage_id++) {
> > +             for (i = stage_id * PIPES_PER_STAGE; i < (stage_id + 1) * PIPES_PER_STAGE; i++) {

Do you mean define and assign r_pipe / r_pipe_cfg here?

> > +                     pipe = &pstate->pipe[i];
> > +                     pipe_cfg = &pstate->pipe_cfg[i];
> > +
> > +                     if (drm_rect_width(&pipe_cfg->src_rect) == 0)
> > +                             break;
> > +
> > +                     pipe->sspp = dpu_rm_reserve_sspp(&dpu_kms->rm, global_state, crtc, &reqs);
> > +                     if (!pipe->sspp)
> > +                             return -ENODEV;
> > +
> > +                     r_pipe = &pstate->pipe[i + 1];
> > +                     r_pipe_cfg = &pstate->pipe_cfg[i + 1];
> > +
> > +                     /*
> > +                      * If current pipe is the first pipe in pipe pair, check
> > +                      * multi-rect opportunity for the 2nd pipe in the pair.
> > +                      * SSPP multi-rect mode cross mixer pairs is not supported.
> > +                      */
> > +                     if ((i % PIPES_PER_STAGE == 0) &&
>
> Please move r_pipe / r_pipe_cfg definition and assignment here.

r_pipe / r_pipe_cfg is used in this if(). Please see above question.
>
>
> > +                         drm_rect_width(&r_pipe_cfg->src_rect) != 0 &&
> > +                         dpu_plane_try_multirect_parallel(pipe, pipe_cfg, r_pipe, r_pipe_cfg,
> > +                                                           pipe->sspp,
> > +                                                           msm_framebuffer_format(plane_state->fb),
> > +                                                           dpu_kms->catalog->caps->max_linewidth)) {
> > +                             i++;
> > +                     } else {
> > +                             /* multirect is not possible, use two SSPP blocks */
> > +                             pipe->multirect_index = DPU_SSPP_RECT_SOLO;
> > +                             pipe->multirect_mode = DPU_SSPP_MULTIRECT_NONE;
> > +                             DPU_DEBUG_PLANE(pdpu, "allocating sspp_%d for pipe %d.\n",
> > +                                             pipe->sspp->idx - SSPP_NONE, i);
> > +                     }
> > +             }
> >       }
> >
> >       return dpu_plane_atomic_check_sspp(plane, state, crtc_state);
> >
> > --
> > 2.34.1
> >
>
> --
> With best wishes
> Dmitry