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Date:   Fri, 28 Oct 2022 17:25:19 +0200
From:   Marijn Suijten <marijn.suijten@somainline.org>
To:     Kalyan Thota <quic_kalyant@quicinc.com>
Cc:     dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org,
        freedreno@lists.freedesktop.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, robdclark@gmail.com,
        dianders@chromium.org, swboyd@chromium.org,
        quic_vpolimer@quicinc.com, dmitry.baryshkov@linaro.org,
        quic_abhinavk@quicinc.com
Subject: Re: [v6] drm/msm/disp/dpu1: add support for dspp sub block flush in
 sc7280
Message-ID: <20221028152519.szxtc635pcaectxp@SoMainline.org>
References: <1664680506-8336-1-git-send-email-quic_kalyant@quicinc.com>
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In-Reply-To: <1664680506-8336-1-git-send-email-quic_kalyant@quicinc.com>
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On 2022-10-01 20:15:06, Kalyan Thota wrote:
> Flush mechanism for DSPP blocks has changed in sc7280 family, it
> allows individual sub blocks to be flushed in coordination with
> master flush control.
> 
> Representation: master_flush && (PCC_flush | IGC_flush .. etc )
> 
> This change adds necessary support for the above design.
> 
> Changes in v1:
> - Few nits (Doug, Dmitry)
> - Restrict sub-block flush programming to dpu_hw_ctl file (Dmitry)
> 
> Changes in v2:
> - Move the address offset to flush macro (Dmitry)
> - Seperate ops for the sub block flush (Dmitry)
> 
> Changes in v3:
> - Reuse the DPU_DSPP_xx enum instead of a new one (Dmitry)
> 
> Changes in v4:
> - Use shorter version for unsigned int (Stephen)
> 
> Changes in v5:
> - Spurious patch please ignore.
> 
> Changes in v6:
> - Add SOB tag (Doug, Dmitry)
> 
> Signed-off-by: Kalyan Thota <quic_kalyant@quicinc.com>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c       |  2 +-
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c |  5 +++-
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h |  4 +++
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c     | 35 ++++++++++++++++++++++++--
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h     | 10 ++++++--
>  5 files changed, 50 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> index 601d687..4170fbe 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> @@ -766,7 +766,7 @@ static void _dpu_crtc_setup_cp_blocks(struct drm_crtc *crtc)
>  
>  		/* stage config flush mask */
>  		ctl->ops.update_pending_flush_dspp(ctl,
> -			mixer[i].hw_dspp->idx);
> +			mixer[i].hw_dspp->idx, DPU_DSPP_PCC);
>  	}
>  }
>  
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
> index 27f029f..0eecb2f 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
> @@ -65,7 +65,10 @@
>  	(PINGPONG_SDM845_MASK | BIT(DPU_PINGPONG_TE2))
>  
>  #define CTL_SC7280_MASK \
> -	(BIT(DPU_CTL_ACTIVE_CFG) | BIT(DPU_CTL_FETCH_ACTIVE) | BIT(DPU_CTL_VM_CFG))
> +	(BIT(DPU_CTL_ACTIVE_CFG) | \
> +	 BIT(DPU_CTL_FETCH_ACTIVE) | \
> +	 BIT(DPU_CTL_VM_CFG) | \
> +	 BIT(DPU_CTL_DSPP_SUB_BLOCK_FLUSH))
>  
>  #define MERGE_3D_SM8150_MASK (0)
>  
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> index 38aa38a..8148e91 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> @@ -161,10 +161,12 @@ enum {
>   * DSPP sub-blocks
>   * @DPU_DSPP_PCC             Panel color correction block
>   * @DPU_DSPP_GC              Gamma correction block
> + * @DPU_DSPP_IGC             Inverse Gamma correction block

Lowercase G? Otherwise capitalize Correction as well to match the IGC
abbrev., and do the same for the other abbreviations above.

>   */
>  enum {
>  	DPU_DSPP_PCC = 0x1,
>  	DPU_DSPP_GC,
> +	DPU_DSPP_IGC,
>  	DPU_DSPP_MAX
>  };
>  
> @@ -191,6 +193,7 @@ enum {
>   * @DPU_CTL_SPLIT_DISPLAY:	CTL supports video mode split display
>   * @DPU_CTL_FETCH_ACTIVE:	Active CTL for fetch HW (SSPPs)
>   * @DPU_CTL_VM_CFG:		CTL config to support multiple VMs
> + * @DPU_CTL_DSPP_BLOCK_FLUSH: CTL config to support dspp sub-block flush
>   * @DPU_CTL_MAX
>   */
>  enum {
> @@ -198,6 +201,7 @@ enum {
>  	DPU_CTL_ACTIVE_CFG,
>  	DPU_CTL_FETCH_ACTIVE,
>  	DPU_CTL_VM_CFG,
> +	DPU_CTL_DSPP_SUB_BLOCK_FLUSH,
>  	DPU_CTL_MAX
>  };
>  
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> index a35ecb6..f26f484 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> @@ -33,6 +33,7 @@
>  #define   CTL_INTF_FLUSH                0x110
>  #define   CTL_INTF_MASTER               0x134
>  #define   CTL_FETCH_PIPE_ACTIVE         0x0FC
> +#define   CTL_DSPP_n_FLUSH(n)		((0x13C) + ((n - 1) * 4))

Use spaces for indentation just like the other defines.  Replace 1 with
DSPP_0.

>  
>  #define CTL_MIXER_BORDER_OUT            BIT(24)
>  #define CTL_FLUSH_MASK_CTL              BIT(17)
> @@ -287,8 +288,9 @@ static void dpu_hw_ctl_update_pending_flush_merge_3d_v1(struct dpu_hw_ctl *ctx,
>  }
>  
>  static void dpu_hw_ctl_update_pending_flush_dspp(struct dpu_hw_ctl *ctx,
> -	enum dpu_dspp dspp)
> +	enum dpu_dspp dspp, u32 dspp_sub_blk)
>  {
> +
>  	switch (dspp) {
>  	case DSPP_0:
>  		ctx->pending_flush_mask |= BIT(13);
> @@ -307,6 +309,31 @@ static void dpu_hw_ctl_update_pending_flush_dspp(struct dpu_hw_ctl *ctx,
>  	}
>  }
>  
> +static void dpu_hw_ctl_update_pending_flush_dspp_subblocks(
> +	struct dpu_hw_ctl *ctx,	enum dpu_dspp dspp, u32 dspp_sub_blk)
> +{
> +	u32 flushbits = 0, active;
> +
> +	switch (dspp_sub_blk) {
> +	case DPU_DSPP_IGC:
> +		flushbits = BIT(2);
> +		break;
> +	case DPU_DSPP_PCC:
> +		flushbits = BIT(4);
> +		break;
> +	case DPU_DSPP_GC:
> +		flushbits = BIT(5);
> +		break;
> +	default:
> +		return;
> +	}
> +
> +	active = DPU_REG_READ(&ctx->hw, CTL_DSPP_n_FLUSH(dspp));
> +	DPU_REG_WRITE(&ctx->hw, CTL_DSPP_n_FLUSH(dspp), active | flushbits);
> +
> +	ctx->pending_flush_mask |= BIT(29);
> +}
> +
>  static u32 dpu_hw_ctl_poll_reset_status(struct dpu_hw_ctl *ctx, u32 timeout_us)
>  {
>  	struct dpu_hw_blk_reg_map *c = &ctx->hw;
> @@ -675,7 +702,11 @@ static void _setup_ctl_ops(struct dpu_hw_ctl_ops *ops,
>  	ops->setup_blendstage = dpu_hw_ctl_setup_blendstage;
>  	ops->update_pending_flush_sspp = dpu_hw_ctl_update_pending_flush_sspp;
>  	ops->update_pending_flush_mixer = dpu_hw_ctl_update_pending_flush_mixer;
> -	ops->update_pending_flush_dspp = dpu_hw_ctl_update_pending_flush_dspp;
> +	if (cap & BIT(DPU_CTL_DSPP_SUB_BLOCK_FLUSH))
> +		ops->update_pending_flush_dspp = dpu_hw_ctl_update_pending_flush_dspp_subblocks;
> +	else
> +		ops->update_pending_flush_dspp = dpu_hw_ctl_update_pending_flush_dspp;
> +
>  	if (cap & BIT(DPU_CTL_FETCH_ACTIVE))
>  		ops->set_active_pipes = dpu_hw_ctl_set_fetch_pipe_active;
>  };
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
> index 96c012e..1743572 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
> @@ -149,12 +149,18 @@ struct dpu_hw_ctl_ops {
>  
>  	/**
>  	 * OR in the given flushbits to the cached pending_flush_mask
> -	 * No effect on hardware
> +	 *
> +	 * If the hardware supports dspp sub block flush, then sub-block

sub[ -]block written with a space _and_ with a hyphen, what is it?

> +	 * flushes are written to the hardware and main dspp flush will
> +	 * be cached in the pending_flush_mask.
> +	 *
>  	 * @ctx       : ctl path ctx pointer
>  	 * @blk       : DSPP block index
> +	 * @dspp_sub_blk : DSPP sub-block index
>  	 */
>  	void (*update_pending_flush_dspp)(struct dpu_hw_ctl *ctx,
> -		enum dpu_dspp blk);
> +		enum dpu_dspp blk,  u32 dspp_sub_blk);

Double space?

- Marijn

> +
>  	/**
>  	 * Write the value of the pending_flush_mask to hardware
>  	 * @ctx       : ctl path ctx pointer
> -- 
> 2.7.4
>