linux-kernel - Re: [PATCH 04/11] drm/msm/disp/dpu1: Add DSC support in RM

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Message-ID: <YV153cn39rZeqcJT@matsya>
Date:   Wed, 6 Oct 2021 15:56:37 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Rob Clark <robdclark@...il.com>, linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jonathan Marek <jonathan@...ek.ca>,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        Jeffrey Hugo <jeffrey.l.hugo@...il.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org
Subject: Re: [PATCH 04/11] drm/msm/disp/dpu1: Add DSC support in RM

On 29-07-21, 23:23, Dmitry Baryshkov wrote:
> On 15/07/2021 09:51, Vinod Koul wrote:

> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
> > index fd2d104f0a91..4da6d72b7996 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
> > @@ -11,6 +11,7 @@
> >   #include "dpu_hw_intf.h"
> >   #include "dpu_hw_dspp.h"
> >   #include "dpu_hw_merge3d.h"
> > +#include "dpu_hw_dsc.h"
> >   #include "dpu_encoder.h"
> >   #include "dpu_trace.h"
> > @@ -75,6 +76,14 @@ int dpu_rm_destroy(struct dpu_rm *rm)
> >   			dpu_hw_intf_destroy(hw);
> >   		}
> >   	}
> > +	for (i = 0; i < ARRAY_SIZE(rm->dsc_blks); i++) {
> > +		struct dpu_hw_dsc *hw;
> > +
> > +		if (rm->intf_blks[i]) {
> 
> rm->dsc_blks[i]

Thanks for spotting, fixed!

> 
> > +			hw = to_dpu_hw_dsc(rm->dsc_blks[i]);
> > +			dpu_hw_dsc_destroy(hw);
> > +		}
> > +	}
> >   	return 0;
> >   }
> > @@ -221,6 +230,19 @@ int dpu_rm_init(struct dpu_rm *rm,
> >   		rm->dspp_blks[dspp->id - DSPP_0] = &hw->base;
> >   	}
> > +	for (i = 0; i < cat->dsc_count; i++) {
> > +		struct dpu_hw_dsc *hw;
> > +		const struct dpu_dsc_cfg *dsc = &cat->dsc[i];
> > +
> > +		hw = dpu_hw_dsc_init(dsc->id, mmio, cat);
> > +		if (IS_ERR_OR_NULL(hw)) {
> > +			rc = PTR_ERR(hw);
> > +			DPU_ERROR("failed dsc object creation: err %d\n", rc);
> > +			goto fail;
> > +		}
> > +		rm->dsc_blks[dsc->id - DSC_0] = &hw->base;
> > +	}
> > +
> >   	return 0;
> >   fail:
> > @@ -476,6 +498,9 @@ static int _dpu_rm_reserve_intf(
> >   	}
> >   	global_state->intf_to_enc_id[idx] = enc_id;
> > +
> > +	global_state->dsc_to_enc_id[0] = enc_id;
> > +	global_state->dsc_to_enc_id[1] = enc_id;
> 
> This is not correct. At least this should be guarded with an if, checking
> that DSC is requested. Also we'd need to check that DSC 0 and 1 are not
> allocated.

Correct, so I have done few changes here and for DSC block reservation..
- Calling dpu_rm_get_assigned_resources() for DSC only when DSC is
  required from dpu encoder
- moved the above code to dsc helper: _dpu_rm_reserve_dsc() as suggested
  by Abhinav as well
- Check if DSC is supported and then check if DSC 0|1 are not allocated
  and then assign as above

-- 
~Vinod