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

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Message-ID: <7d656b2265ade461cae993c691d31ab8@codeaurora.org>
Date:   Mon, 02 Aug 2021 16:24:25 -0700
From:   abhinavk@...eaurora.org
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Rob Clark <robdclark@...il.com>,
        Jonathan Marek <jonathan@...ek.ca>,
        Jeffrey Hugo <jeffrey.l.hugo@...il.com>,
        David Airlie <airlied@...ux.ie>, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        dri-devel@...ts.freedesktop.org, Daniel Vetter <daniel@...ll.ch>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        freedreno@...ts.freedesktop.org,
        Sumit Semwal <sumit.semwal@...aro.org>
Subject: Re: [Freedreno] [PATCH 04/11] drm/msm/disp/dpu1: Add DSC support in
 RM

On 2021-07-14 23:51, Vinod Koul wrote:
> This add the bits in RM to enable the DSC blocks
> 
> Signed-off-by: Vinod Koul <vkoul@...nel.org>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h |  1 +
>  drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c  | 32 +++++++++++++++++++++++++
>  drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h  |  1 +
>  3 files changed, 34 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
> b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
> index d6717d6672f7..d56c05146dfe 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
> @@ -165,6 +165,7 @@ struct dpu_global_state {
>  	uint32_t ctl_to_enc_id[CTL_MAX - CTL_0];
>  	uint32_t intf_to_enc_id[INTF_MAX - INTF_0];
>  	uint32_t dspp_to_enc_id[DSPP_MAX - DSPP_0];
> +	uint32_t dsc_to_enc_id[DSC_MAX - DSC_0];
>  };
> 
>  struct dpu_global_state
> 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]) {
same comment as dmitry on this 
https://patchwork.freedesktop.org/patch/444070/?series=90413&rev=2
> +			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;
>  	return 0;
>  }
agree with dmitry again here, why are DSCs being reserved in the 
_dpu_rm_reserve_intf function?
First, for clarity, they should be in a function of their own.
Allocating the DSCs has to also account for the PP availability of that 
DSC and other factors need to
be considered as well.
I suggest checking _sde_rm_reserve_dsc() from downstream to improve the 
DSC reservation logic.
> 
> @@ -567,6 +592,8 @@ void dpu_rm_release(struct dpu_global_state 
> *global_state,
>  		ARRAY_SIZE(global_state->ctl_to_enc_id), enc->base.id);
>  	_dpu_rm_clear_mapping(global_state->intf_to_enc_id,
>  		ARRAY_SIZE(global_state->intf_to_enc_id), enc->base.id);
> +	_dpu_rm_clear_mapping(global_state->dsc_to_enc_id,
> +		ARRAY_SIZE(global_state->dsc_to_enc_id), enc->base.id);
>  }
> 
>  int dpu_rm_reserve(
> @@ -640,6 +667,11 @@ int dpu_rm_get_assigned_resources(struct dpu_rm 
> *rm,
>  		hw_to_enc_id = global_state->dspp_to_enc_id;
>  		max_blks = ARRAY_SIZE(rm->dspp_blks);
>  		break;
> +	case DPU_HW_BLK_DSC:
> +		hw_blks = rm->dsc_blks;
> +		hw_to_enc_id = global_state->dsc_to_enc_id;
> +		max_blks = ARRAY_SIZE(rm->dsc_blks);
> +		break;
>  	default:
>  		DPU_ERROR("blk type %d not managed by rm\n", type);
>  		return 0;
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h
> b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h
> index 1f12c8d5b8aa..278d2a510b80 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h
> @@ -30,6 +30,7 @@ struct dpu_rm {
>  	struct dpu_hw_blk *intf_blks[INTF_MAX - INTF_0];
>  	struct dpu_hw_blk *dspp_blks[DSPP_MAX - DSPP_0];
>  	struct dpu_hw_blk *merge_3d_blks[MERGE_3D_MAX - MERGE_3D_0];
> +	struct dpu_hw_blk *dsc_blks[DSC_MAX - DSC_0];
> 
>  	uint32_t lm_max_width;
>  };