[PATCH 7/7] drm/msm/dpu: move INTF tearing checks to dpu_encoder_phys_cmd_init

[Marijn Suijten]

On 2023-07-27 22:22:20, Marijn Suijten wrote:
> On 2023-07-27 19:21:04, Dmitry Baryshkov wrote:
> > As the INTF is fixed at the encoder creation time, we can move the
> > check whether INTF supports tearchck to dpu_encoder_phys_cmd_init().
> > This function can return an error if INTF doesn't have required feature.
> > Performing this check in dpu_encoder_phys_cmd_tearcheck_config() is less
> > useful, as this function returns void.
> > 
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
> > ---
> >  .../drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c  | 37 +++++++++++--------
> >  1 file changed, 21 insertions(+), 16 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
> > index 04a1106101a7..e1dd0e1b4793 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
> > @@ -325,24 +325,17 @@ static void dpu_encoder_phys_cmd_tearcheck_config(
> >  	unsigned long vsync_hz;
> >  	struct dpu_kms *dpu_kms;
> >  
> > -	if (phys_enc->has_intf_te) {
> > -		if (!phys_enc->hw_intf ||
> > -		    !phys_enc->hw_intf->ops.enable_tearcheck) {
> > -			DPU_DEBUG_CMDENC(cmd_enc, "tearcheck not supported\n");
> > -			return;
> > -		}
> > -
> > -		DPU_DEBUG_CMDENC(cmd_enc, "");
> > -	} else {
> > -		if (!phys_enc->hw_pp ||
> > -		    !phys_enc->hw_pp->ops.enable_tearcheck) {
> > -			DPU_DEBUG_CMDENC(cmd_enc, "tearcheck not supported\n");
> > -			return;
> > -		}
> > -
> > -		DPU_DEBUG_CMDENC(cmd_enc, "pp %d\n", phys_enc->hw_pp->idx - PINGPONG_0);
> > +	if (!phys_enc->has_intf_te &&
> > +	    (!phys_enc->hw_pp ||
> > +	     !phys_enc->hw_pp->ops.enable_tearcheck)) {
> 
> when is hw_pp assigned?  Can't we also check that somewhere in an init
> phase?

It would happen right before dpu_encoder_phys_cmd_atomic_mode_set()
where we already happen to check has_intf_te to switch on PP
intr_readptr vs INTF intr_tear_rd_ptr.  Might be the perfect place for
the pingpong callback checks?

- Marijn

> 
> Also, you won't go over 100 chars (not even 80) by having the (!... ||
> !...) on a single line.
> 
> > +		DPU_DEBUG_CMDENC(cmd_enc, "tearcheck not supported\n");
> > +		return;
> >  	}
> >  
> > +	DPU_DEBUG_CMDENC(cmd_enc, "intf %d pp %d\n",
> > +			 phys_enc->hw_intf->idx - INTF_0,
> > +			 phys_enc->hw_pp->idx - PINGPONG_0);
> > +
> >  	mode = &phys_enc->cached_mode;
> >  
> >  	dpu_kms = phys_enc->dpu_kms;
> > @@ -768,9 +761,21 @@ struct dpu_encoder_phys *dpu_encoder_phys_cmd_init(
> >  	phys_enc->intf_mode = INTF_MODE_CMD;
> >  	cmd_enc->stream_sel = 0;
> >  
> > +	if (!phys_enc->hw_intf) {
> > +		DPU_ERROR_CMDENC(cmd_enc, "no INTF provided\n");
> > +
> > +		return ERR_PTR(-EINVAL);
> > +	}
> > +
> >  	if (phys_enc->dpu_kms->catalog->mdss_ver->core_major_ver >= 5)
> >  		phys_enc->has_intf_te = true;
> >  
> > +	if (phys_enc->has_intf_te && !phys_enc->hw_intf->ops.enable_tearcheck) {
> 
> Any other callbacks we could check here, and remove the checks
> elsewhere?
> 
> As with enable_tearcheck() though, it does make the code less consistent
> with its PP counterpart, which is checked ad-hoc everywhere (but maybe
> that is fixable too).
> 
> - Marijn
> 
> > +		DPU_ERROR_CMDENC(cmd_enc, "tearcheck not supported\n");
> > +
> > +		return ERR_PTR(-EINVAL);
> > +	}
> > +
> >  	atomic_set(&cmd_enc->pending_vblank_cnt, 0);
> >  	init_waitqueue_head(&cmd_enc->pending_vblank_wq);
> >  
> > -- 
> > 2.39.2
> >