linux-kernel - Re: [PATCH 10/16] drm/msm/dpu: add support to disable CDM block during encoder cleanup

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Date:   Fri, 1 Dec 2023 10:36:01 +0200
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Abhinav Kumar <quic_abhinavk@...cinc.com>
Cc:     freedreno@...ts.freedesktop.org, Rob Clark <robdclark@...il.com>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, quic_jesszhan@...cinc.com,
        quic_parellan@...cinc.com, quic_khsieh@...cinc.com,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/16] drm/msm/dpu: add support to disable CDM block
 during encoder cleanup

On Fri, 1 Dec 2023 at 01:58, Abhinav Kumar <quic_abhinavk@...cinc.com> wrote:
>
>
>
> On 8/30/2023 5:14 PM, Dmitry Baryshkov wrote:
> > On Thu, 31 Aug 2023 at 01:50, Abhinav Kumar <quic_abhinavk@...cinc.com> wrote:
> >>
> >> In preparation of setting up CDM block, add the logic to disable it
> >> properly during encoder cleanup.
> >>
> >> Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
> >> ---
> >>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c      | 8 ++++++++
> >>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h | 2 ++
> >>   2 files changed, 10 insertions(+)
> >>
> >> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> >> index 582680804016..1b1e07292a9e 100644
> >> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> >> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> >> @@ -26,6 +26,7 @@
> >>   #include "dpu_hw_dspp.h"
> >>   #include "dpu_hw_dsc.h"
> >>   #include "dpu_hw_merge3d.h"
> >> +#include "dpu_hw_cdm.h"
> >>   #include "dpu_formats.h"
> >>   #include "dpu_encoder_phys.h"
> >>   #include "dpu_crtc.h"
> >> @@ -2097,6 +2098,13 @@ void dpu_encoder_helper_phys_cleanup(struct dpu_encoder_phys *phys_enc)
> >>                                          phys_enc->hw_pp->merge_3d->idx);
> >>          }
> >>
> >> +       if (phys_enc->hw_cdm && phys_enc->hw_cdm->ops.bind_pingpong_blk && phys_enc->hw_pp) {
> >> +               phys_enc->hw_cdm->ops.bind_pingpong_blk(phys_enc->hw_cdm,
> >> +                                                       false, phys_enc->hw_pp->idx);
> >
> > But it was already bound in the cdm->enable, wasn't it?

Yes :-(

> >
>
> This is disable. I think you missed the "false" parameter.
>
> > Also the update_pending_flush_cdm should be called even for DPU < 5.0,
> > where there should be no bind_pingpong_blk callback.
> >
>
> Ack. This is a good catch!
>
> >> +               if (phys_enc->hw_ctl->ops.update_pending_flush_cdm)
> >> +                       phys_enc->hw_ctl->ops.update_pending_flush_cdm(phys_enc->hw_ctl);
> >> +       }
> >> +
> >>          if (dpu_enc->dsc) {
> >>                  dpu_encoder_unprep_dsc(dpu_enc);
> >>                  dpu_enc->dsc = NULL;
> >> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> >> index 24dbc28be4f8..510c1c41ddbc 100644
> >> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> >> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> >> @@ -150,6 +150,7 @@ enum dpu_intr_idx {
> >>    * @hw_pp:             Hardware interface to the ping pong registers
> >>    * @hw_intf:           Hardware interface to the intf registers
> >>    * @hw_wb:             Hardware interface to the wb registers
> >> + * @hw_cdm:            Hardware interface to the CDM registers
> >>    * @dpu_kms:           Pointer to the dpu_kms top level
> >>    * @cached_mode:       DRM mode cached at mode_set time, acted on in enable
> >>    * @enabled:           Whether the encoder has enabled and running a mode
> >> @@ -178,6 +179,7 @@ struct dpu_encoder_phys {
> >>          struct dpu_hw_pingpong *hw_pp;
> >>          struct dpu_hw_intf *hw_intf;
> >>          struct dpu_hw_wb *hw_wb;
> >> +       struct dpu_hw_cdm *hw_cdm;
> >>          struct dpu_kms *dpu_kms;
> >>          struct drm_display_mode cached_mode;
> >>          enum dpu_enc_split_role split_role;
> >> --
> >> 2.40.1
> >>
> >
> >



-- 
With best wishes
Dmitry