[PATCH 5/8] drm/msm/dpu: drop the dpu_core_perf_crtc_update()'s stop_req param

[Dmitry Baryshkov]

On Tue, 4 Jul 2023 at 01:37, Abhinav Kumar <quic_abhinavk at quicinc.com> wrote:
>
>
>
> On 6/19/2023 5:08 PM, Dmitry Baryshkov wrote:
> > The stop_req is true only in the dpu_crtc_disable() case, when
> > crtc->enable has already been set to false. This renders the stop_req
> > argument useless. Remove it completely.
> >
>
> What about the enable case?
>
> That time dpu_crtc->enabled  will be false but you need valid clock and
> BW that time when you want to enable.

Maybe I'm missing something here. The driver sets dpu_crtc->enabled in
atomic_enable, while dpu_core_perf_crtc_update() is called further,
during atomic_flush, or from the CRTC event handler. And both these
cases have stop_req as false.

>
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
> > ---
> >   drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c | 12 ++++++------
> >   drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.h |  3 +--
> >   drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c      |  6 +++---
> >   3 files changed, 10 insertions(+), 11 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 f8d5c87d0915..773e641eab28 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
> > @@ -277,7 +277,7 @@ static u64 _dpu_core_perf_get_core_clk_rate(struct dpu_kms *kms)
> >   }
> >
> >   int dpu_core_perf_crtc_update(struct drm_crtc *crtc,
> > -             int params_changed, bool stop_req)
> > +                           int params_changed)
> >   {
> >       struct dpu_core_perf_params *new, *old;
> >       bool update_bus = false, update_clk = false;
> > @@ -301,13 +301,13 @@ int dpu_core_perf_crtc_update(struct drm_crtc *crtc,
> >       dpu_crtc = to_dpu_crtc(crtc);
> >       dpu_cstate = to_dpu_crtc_state(crtc->state);
> >
> > -     DRM_DEBUG_ATOMIC("crtc:%d stop_req:%d core_clk:%llu\n",
> > -                     crtc->base.id, stop_req, kms->perf.core_clk_rate);
> > +     DRM_DEBUG_ATOMIC("crtc:%d enabled:%d core_clk:%llu\n",
> > +                     crtc->base.id, crtc->enabled, kms->perf.core_clk_rate);
> >
> >       old = &dpu_crtc->cur_perf;
> >       new = &dpu_cstate->new_perf;
> >
> > -     if (crtc->enabled && !stop_req) {
> > +     if (crtc->enabled) {
> >               /*
> >                * cases for bus bandwidth update.
> >                * 1. new bandwidth vote - "ab or ib vote" is higher
> > @@ -337,7 +337,7 @@ int dpu_core_perf_crtc_update(struct drm_crtc *crtc,
> >       }
> >
> >       trace_dpu_perf_crtc_update(crtc->base.id, new->bw_ctl,
> > -             new->core_clk_rate, stop_req, update_bus, update_clk);
> > +             new->core_clk_rate, !crtc->enabled, update_bus, update_clk);
> >
> >       if (update_bus) {
> >               ret = _dpu_core_perf_crtc_update_bus(kms, crtc);
> > @@ -355,7 +355,7 @@ int dpu_core_perf_crtc_update(struct drm_crtc *crtc,
> >       if (update_clk) {
> >               clk_rate = _dpu_core_perf_get_core_clk_rate(kms);
> >
> > -             trace_dpu_core_perf_update_clk(kms->dev, stop_req, clk_rate);
> > +             trace_dpu_core_perf_update_clk(kms->dev, !crtc->enabled, clk_rate);
> >
> >               clk_rate = min(clk_rate, kms->perf.max_core_clk_rate);
> >               ret = dev_pm_opp_set_rate(&kms->pdev->dev, clk_rate);
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.h
> > index 2bf7836f79bb..c29ec72984b8 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.h
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.h
> > @@ -58,11 +58,10 @@ int dpu_core_perf_crtc_check(struct drm_crtc *crtc,
> >    * dpu_core_perf_crtc_update - update performance of the given crtc
> >    * @crtc: Pointer to crtc
> >    * @params_changed: true if crtc parameters are modified
> > - * @stop_req: true if this is a stop request
> >    * return: zero if success, or error code otherwise
> >    */
> >   int dpu_core_perf_crtc_update(struct drm_crtc *crtc,
> > -             int params_changed, bool stop_req);
> > +                           int params_changed);
> >
> >   /**
> >    * dpu_core_perf_crtc_release_bw - release bandwidth of the given crtc
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> > index ff5d306b95ed..214229d11e3e 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> > @@ -718,7 +718,7 @@ static void dpu_crtc_frame_event_cb(void *data, u32 event)
> >   void dpu_crtc_complete_commit(struct drm_crtc *crtc)
> >   {
> >       trace_dpu_crtc_complete_commit(DRMID(crtc));
> > -     dpu_core_perf_crtc_update(crtc, 0, false);
> > +     dpu_core_perf_crtc_update(crtc, 0);
> >       _dpu_crtc_complete_flip(crtc);
> >   }
> >
> > @@ -884,7 +884,7 @@ static void dpu_crtc_atomic_flush(struct drm_crtc *crtc,
> >               return;
> >
> >       /* update performance setting before crtc kickoff */
> > -     dpu_core_perf_crtc_update(crtc, 1, false);
> > +     dpu_core_perf_crtc_update(crtc, 1);
> >
> >       /*
> >        * Final plane updates: Give each plane a chance to complete all
> > @@ -1100,7 +1100,7 @@ static void dpu_crtc_disable(struct drm_crtc *crtc,
> >               atomic_set(&dpu_crtc->frame_pending, 0);
> >       }
> >
> > -     dpu_core_perf_crtc_update(crtc, 0, true);
> > +     dpu_core_perf_crtc_update(crtc, 0);
> >
> >       drm_for_each_encoder_mask(encoder, crtc->dev, crtc->state->encoder_mask)
> >               dpu_encoder_register_frame_event_callback(encoder, NULL, NULL);



-- 
With best wishes
Dmitry