linux-kernel - Re: [PATCH v8 2/8] drm/msm/dpu: add DPU_PINGPONG

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Message-ID: <bzfwgc6akvfvupvro2jz7mi3r6mltftkng3u7oxuyrdztzjqw7@nj3dxbiu4tiz>
Date:   Sat, 13 May 2023 21:26:26 +0200
From:   Marijn Suijten <marijn.suijten@...ainline.org>
To:     Kuogee Hsieh <quic_khsieh@...cinc.com>
Cc:     dri-devel@...ts.freedesktop.org, robdclark@...il.com,
        sean@...rly.run, swboyd@...omium.org, dianders@...omium.org,
        vkoul@...nel.org, daniel@...ll.ch, airlied@...il.com,
        agross@...nel.org, dmitry.baryshkov@...aro.org,
        andersson@...nel.org, quic_abhinavk@...cinc.com,
        quic_jesszhan@...cinc.com, quic_sbillaka@...cinc.com,
        freedreno@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 2/8] drm/msm/dpu: add DPU_PINGPONG_DSC feature bit for
 DPU < 7.0.0

On 2023-05-12 11:00:17, Kuogee Hsieh wrote:
> 
> DPU < 7.0.0 requires the PINGPONG block to be involved during
> DSC setting up. Since DPU >= 7.0.0, enabling and starting the DSC
> encoder engine was moved to INTF with the help of the flush mechanism.
> Add a DPU_PINGPONG_DSC feature bit to restrict the availability of
> dpu_hw_pp_setup_dsc() and dpu_hw_pp_dsc_{enable,disable}() on the
> PINGPONG block to DPU < 7.0.0 hardware, as the registers are not
> available [in the PINGPONG block] on DPU 7.0.0 and higher anymore.

Fwiw I added the brackets in the suggestion as an "up to you to include
this or not".  Drop the brackets if you think this should be part of the
sentence.

> Add DPU_PINGPONG_DSC to PINGPONG_SDM845_MASK, PINGPONG_SDM845_TE2_MASK
> and PINGPONG_SM8150_MASK which is used for all DPU < 7.0 chipsets.
> 
> changes in v6:
> -- split patches and rearrange to keep catalog related files at this patch
> 
> changes in v7:
> -- rewording commit text as suggested at review comments
> 
> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c | 6 +++---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h | 4 +++-
>  2 files changed, 6 insertions(+), 4 deletions(-)
> 
> 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 82b58c6..78e4bf6 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
> @@ -76,13 +76,13 @@
>  	(BIT(DPU_DIM_LAYER) | BIT(DPU_MIXER_COMBINED_ALPHA))
>  
>  #define PINGPONG_SDM845_MASK \
> -	(BIT(DPU_PINGPONG_DITHER) | BIT(DPU_PINGPONG_TE))
> +	(BIT(DPU_PINGPONG_DITHER) | BIT(DPU_PINGPONG_TE) | BIT(DPU_PINGPONG_DSC))
>  
>  #define PINGPONG_SDM845_TE2_MASK \
> -	(PINGPONG_SDM845_MASK | BIT(DPU_PINGPONG_TE2))
> +	(PINGPONG_SDM845_MASK | BIT(DPU_PINGPONG_TE2) | BIT(DPU_PINGPONG_DSC))

Don't add it here, this is already in PINGPONG_SDM845_MASK.

>  
>  #define PINGPONG_SM8150_MASK \
> -	(BIT(DPU_PINGPONG_DITHER))
> +	(BIT(DPU_PINGPONG_DITHER) | BIT(DPU_PINGPONG_DSC))
>  
>  #define CTL_SC7280_MASK \
>  	(BIT(DPU_CTL_ACTIVE_CFG) | \
> 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 6ee48f0..dc0a4da 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> @@ -144,7 +144,8 @@ enum {
>   * @DPU_PINGPONG_TE2        Additional tear check block for split pipes
>   * @DPU_PINGPONG_SPLIT      PP block supports split fifo
>   * @DPU_PINGPONG_SLAVE      PP block is a suitable slave for split fifo
> - * @DPU_PINGPONG_DITHER,    Dither blocks
> + * @DPU_PINGPONG_DITHER     Dither blocks
> + * @DPU_PINGPONG_DSC        PP ops functions required for DSC

Following the other documentation wording:

    PP block supports DSC

Or:

    PP block has DSC enable/disable registers

- Marijn

>   * @DPU_PINGPONG_MAX
>   */
>  enum {
> @@ -153,6 +154,7 @@ enum {
>  	DPU_PINGPONG_SPLIT,
>  	DPU_PINGPONG_SLAVE,
>  	DPU_PINGPONG_DITHER,
> +	DPU_PINGPONG_DSC,
>  	DPU_PINGPONG_MAX
>  };
>  
> -- 
> 2.7.4
>