Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Tue, 1 Nov 2022 12:43:04 +0100
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: [v7] drm/msm/disp/dpu1: add support for dspp sub block flush in
 sc7280
Message-ID: <20221101114304.3vsurukthhh34wmf@SoMainline.org>
References: <1667300225-14367-1-git-send-email-quic_kalyant@quicinc.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1667300225-14367-1-git-send-email-quic_kalyant@quicinc.com>
Precedence: bulk

On 2022-11-01 03:57:05, 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)
> 
> Changes in v7:
> - Cache flush mask per dspp (Dmitry)
> - Few nits (Marijn)

Thanks, but it seems like you skipped some of them.  I'll point them out
again this time, including some new formatting issues.

> 
> Signed-off-by: Kalyan Thota <quic_kalyant@quicinc.com>
> ---
>  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     | 46 ++++++++++++++++++++++++--
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h     |  7 ++--
>  5 files changed, 58 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

Here.

>   */
>  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

I even overlooked this in my review: all docs use spaces except these
use tabs... Yet you use spaces here and didn't even align the text.

Either use tabs in the line you add here, or replace the rest with
spaces and align them again.

>   * @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..fbcb7da 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) * 4))

Here.

>  
>  #define CTL_MIXER_BORDER_OUT            BIT(24)
>  #define CTL_FLUSH_MASK_CTL              BIT(17)
> @@ -110,9 +111,14 @@ static inline void dpu_hw_ctl_trigger_pending(struct dpu_hw_ctl *ctx)
>  
>  static inline void dpu_hw_ctl_clear_pending_flush(struct dpu_hw_ctl *ctx)
>  {
> +	int i;
> +
>  	trace_dpu_hw_ctl_clear_pending_flush(ctx->pending_flush_mask,
>  				     dpu_hw_ctl_get_flush_register(ctx));
>  	ctx->pending_flush_mask = 0x0;
> +
> +	for(i = 0; i < ARRAY_SIZE(ctx->pending_dspp_flush_mask); i++)
> +		ctx->pending_dspp_flush_mask[i] = 0x0;

Any idea why the other `pending_xxx_flush_mask`s aren't cleared here?

>  }
>  
>  static inline void dpu_hw_ctl_update_pending_flush(struct dpu_hw_ctl *ctx,
> @@ -130,6 +136,8 @@ static u32 dpu_hw_ctl_get_pending_flush(struct dpu_hw_ctl *ctx)
>  
>  static inline void dpu_hw_ctl_trigger_flush_v1(struct dpu_hw_ctl *ctx)
>  {
> +	int i;
> +
>  	if (ctx->pending_flush_mask & BIT(MERGE_3D_IDX))
>  		DPU_REG_WRITE(&ctx->hw, CTL_MERGE_3D_FLUSH,
>  				ctx->pending_merge_3d_flush_mask);
> @@ -140,6 +148,11 @@ static inline void dpu_hw_ctl_trigger_flush_v1(struct dpu_hw_ctl *ctx)
>  		DPU_REG_WRITE(&ctx->hw, CTL_WB_FLUSH,
>  				ctx->pending_wb_flush_mask);
>  
> +	for(i = 0; i < ARRAY_SIZE(ctx->pending_dspp_flush_mask); i++)
> +		if (ctx->pending_dspp_flush_mask[i])
> +			DPU_REG_WRITE(&ctx->hw, CTL_DSPP_n_FLUSH(i),
> +				ctx->pending_dspp_flush_mask[i]);
> +
>  	DPU_REG_WRITE(&ctx->hw, CTL_FLUSH, ctx->pending_flush_mask);
>  }
>  
> @@ -287,8 +300,9 @@ 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 +321,30 @@ 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)
> +{
> +
> +	if (dspp >= DSPP_MAX)
> +		return;
> +
> +	switch (dspp_sub_blk) {
> +	case DPU_DSPP_IGC:
> +		ctx->pending_dspp_flush_mask[dspp-DSPP_0] |= BIT(2);

Spaces around -, here and below.

- Marijn

> +		break;
> +	case DPU_DSPP_PCC:
> +		ctx->pending_dspp_flush_mask[dspp-DSPP_0] |= BIT(4);
> +		break;
> +	case DPU_DSPP_GC:
> +		ctx->pending_dspp_flush_mask[dspp-DSPP_0] |= BIT(5);
> +		break;
> +	default:
> +		return;
> +	}
> +
> +	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 +713,11 @@ 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..ff4e92c 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
> @@ -148,13 +148,15 @@ struct dpu_hw_ctl_ops {
>  		enum dpu_lm blk);
>  
>  	/**
> -	 * OR in the given flushbits to the cached pending_flush_mask
> +	 * OR in the given flushbits to the cached pending_dspp_flush_mask
>  	 * No effect on hardware
>  	 * @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);
> +
>  	/**
>  	 * Write the value of the pending_flush_mask to hardware
>  	 * @ctx       : ctl path ctx pointer
> @@ -242,6 +244,7 @@ struct dpu_hw_ctl {
>  	u32 pending_intf_flush_mask;
>  	u32 pending_wb_flush_mask;
>  	u32 pending_merge_3d_flush_mask;
> +	u32 pending_dspp_flush_mask[DSPP_MAX - DSPP_0];
>  
>  	/* ops */
>  	struct dpu_hw_ctl_ops ops;
> -- 
> 2.7.4
>