linux-kernel - RE: [PATCH v4 1/7] drm/msm/disp/dpu1: clear dpu_assign_crtc and get crtc from drm_enc instead of dpu

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Date:   Thu, 7 Jul 2022 14:39:18 +0000
From:   Vinod Polimera <vpolimer@....qualcomm.com>
To:     "dmitry.baryshkov@...aro.org" <dmitry.baryshkov@...aro.org>,
        "Vinod Polimera (QUIC)" <quic_vpolimer@...cinc.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "freedreno@...ts.freedesktop.org" <freedreno@...ts.freedesktop.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "robdclark@...il.com" <robdclark@...il.com>,
        "dianders@...omium.org" <dianders@...omium.org>,
        "swboyd@...omium.org" <swboyd@...omium.org>,
        "Kalyan Thota (QUIC)" <quic_kalyant@...cinc.com>,
        "Kuogee Hsieh (QUIC)" <quic_khsieh@...cinc.com>,
        "Vishnuvardhan Prodduturi (QUIC)" <quic_vproddut@...cinc.com>,
        "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        "Aravind Venkateswaran (QUIC)" <quic_aravindh@...cinc.com>,
        "Abhinav Kumar (QUIC)" <quic_abhinavk@...cinc.com>,
        "Sankeerth Billakanti (QUIC)" <quic_sbillaka@...cinc.com>
Subject: RE: [PATCH v4 1/7] drm/msm/disp/dpu1: clear dpu_assign_crtc and get
 crtc from drm_enc instead of dpu_enc

> NAK. Quoting the documentation:
> 
> only really meaningful for non-atomic drivers. Atomic drivers should
> instead check &drm_connector_state.crtc.
> 
> Please adjust according to the documentation.
   drm_enc gets the crtc info already from new connector state as part of drm_atomic_helper_update_legacy_modeset_state. 
   So drm_enc->crtc will be valid as we access it as part of modeset enable/disable.
                         ```connector->encoder->crtc = new_conn_state->crtc;```.

Thanks,
Vinod P.

> -----Original Message-----
> From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Sent: Wednesday, July 6, 2022 12:34 AM
> To: Vinod Polimera (QUIC) <quic_vpolimer@...cinc.com>; dri-
> devel@...ts.freedesktop.org; linux-arm-msm@...r.kernel.org;
> freedreno@...ts.freedesktop.org; devicetree@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org; robdclark@...il.com;
> dianders@...omium.org; swboyd@...omium.org; Kalyan Thota (QUIC)
> <quic_kalyant@...cinc.com>; Kuogee Hsieh (QUIC)
> <quic_khsieh@...cinc.com>; Vishnuvardhan Prodduturi (QUIC)
> <quic_vproddut@...cinc.com>; bjorn.andersson@...aro.org; Aravind
> Venkateswaran (QUIC) <quic_aravindh@...cinc.com>; Abhinav Kumar
> (QUIC) <quic_abhinavk@...cinc.com>; Sankeerth Billakanti (QUIC)
> <quic_sbillaka@...cinc.com>
> Subject: Re: [PATCH v4 1/7] drm/msm/disp/dpu1: clear dpu_assign_crtc and
> get crtc from drm_enc instead of dpu_enc
> 
> WARNING: This email originated from outside of Qualcomm. Please be wary
> of any links or attachments, and do not enable macros.
> 
> On 05/07/2022 20:00, Vinod Polimera wrote:
> > Update crtc retrieval from dpu_enc to drm_enc, since new links get set
> > as part of the update legacy mode set. The dpu_enc->crtc cache is no
> > more needed, hence cleaning it as part of this change.
> 
> NAK. Quoting the documentation:
> 
> only really meaningful for non-atomic drivers. Atomic drivers should
> instead check &drm_connector_state.crtc.
> 
> Please adjust according to the documentation.
> >
> > Signed-off-by: Vinod Polimera <quic_vpolimer@...cinc.com>
> > ---
> >   drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c    |  4 ----
> >   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 18 +++---------------
> >   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h |  8 --------
> >   3 files changed, 3 insertions(+), 27 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> > index b56f777..f91e3d1 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> > @@ -972,7 +972,6 @@ static void dpu_crtc_disable(struct drm_crtc *crtc,
> >                */
> >               if (dpu_encoder_get_intf_mode(encoder) == INTF_MODE_VIDEO)
> >                       release_bandwidth = true;
> > -             dpu_encoder_assign_crtc(encoder, NULL);
> >       }
> >
> >       /* wait for frame_event_done completion */
> > @@ -1042,9 +1041,6 @@ static void dpu_crtc_enable(struct drm_crtc *crtc,
> >       trace_dpu_crtc_enable(DRMID(crtc), true, dpu_crtc);
> >       dpu_crtc->enabled = true;
> >
> > -     drm_for_each_encoder_mask(encoder, crtc->dev, crtc->state-
> >encoder_mask)
> > -             dpu_encoder_assign_crtc(encoder, crtc);
> > -
> >       /* Enable/restore vblank irq handling */
> >       drm_crtc_vblank_on(crtc);
> >   }
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> > index 52516eb..5629c0b 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> > @@ -1254,8 +1254,8 @@ static void dpu_encoder_vblank_callback(struct
> drm_encoder *drm_enc,
> >       dpu_enc = to_dpu_encoder_virt(drm_enc);
> >
> >       spin_lock_irqsave(&dpu_enc->enc_spinlock, lock_flags);
> > -     if (dpu_enc->crtc)
> > -             dpu_crtc_vblank_callback(dpu_enc->crtc);
> > +     if (drm_enc->crtc)
> > +             dpu_crtc_vblank_callback(drm_enc->crtc);
> >       spin_unlock_irqrestore(&dpu_enc->enc_spinlock, lock_flags);
> >
> >       atomic_inc(&phy_enc->vsync_cnt);
> > @@ -1280,18 +1280,6 @@ static void
> dpu_encoder_underrun_callback(struct drm_encoder *drm_enc,
> >       DPU_ATRACE_END("encoder_underrun_callback");
> >   }
> >
> > -void dpu_encoder_assign_crtc(struct drm_encoder *drm_enc, struct
> drm_crtc *crtc)
> > -{
> > -     struct dpu_encoder_virt *dpu_enc = to_dpu_encoder_virt(drm_enc);
> > -     unsigned long lock_flags;
> > -
> > -     spin_lock_irqsave(&dpu_enc->enc_spinlock, lock_flags);
> > -     /* crtc should always be cleared before re-assigning */
> > -     WARN_ON(crtc && dpu_enc->crtc);
> > -     dpu_enc->crtc = crtc;
> > -     spin_unlock_irqrestore(&dpu_enc->enc_spinlock, lock_flags);
> > -}
> > -
> >   void dpu_encoder_toggle_vblank_for_crtc(struct drm_encoder
> *drm_enc,
> >                                       struct drm_crtc *crtc, bool enable)
> >   {
> > @@ -1302,7 +1290,7 @@ void dpu_encoder_toggle_vblank_for_crtc(struct
> drm_encoder *drm_enc,
> >       trace_dpu_enc_vblank_cb(DRMID(drm_enc), enable);
> >
> >       spin_lock_irqsave(&dpu_enc->enc_spinlock, lock_flags);
> > -     if (dpu_enc->crtc != crtc) {
> > +     if (drm_enc->crtc != crtc) {
> >               spin_unlock_irqrestore(&dpu_enc->enc_spinlock, lock_flags);
> >               return;
> >       }
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
> b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
> > index 781d41c..edba815 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
> > @@ -39,14 +39,6 @@ struct msm_display_info {
> >   };
> >
> >   /**
> > - * dpu_encoder_assign_crtc - Link the encoder to the crtc it's assigned to
> > - * @encoder: encoder pointer
> > - * @crtc:    crtc pointer
> > - */
> > -void dpu_encoder_assign_crtc(struct drm_encoder *encoder,
> > -                          struct drm_crtc *crtc);
> > -
> > -/**
> >    * dpu_encoder_toggle_vblank_for_crtc - Toggles vblank interrupts on or
> off if
> >    *  the encoder is assigned to the given crtc
> >    * @encoder:        encoder pointer
> 
> 
> --
> With best wishes
> Dmitry