linux-kernel - Re: [PATCH v6 2/8] drm/msm/dpu: add DPU_PINGPONG

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Message-ID: <b4438422-f24b-7fc1-18cf-3cebdd777530@linaro.org>
Date:   Thu, 11 May 2023 07:29:12 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Kuogee Hsieh <quic_khsieh@...cinc.com>,
        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, andersson@...nel.org
Cc:     quic_abhinavk@...cinc.com, quic_jesszhan@...cinc.com,
        quic_sbillaka@...cinc.com, marijn.suijten@...ainline.org,
        freedreno@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 2/8] drm/msm/dpu: add DPU_PINGPONG_DSC feature bit for
 DPU < 7.0.0

On 11/05/2023 01:07, 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 moved to INTF with the help of the flush mechanism.

Nit: was moved.

> 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.

this looks good

> Existing call-sites to these callbacks already skip calling into
> them if the function pointer is NULL.

This is more relevant for patch 3 commit message.

> Add DPU_PINGPONG_DSC feature
> bit to all chipset with DPU < 7.0.0.

This is incorrect, as we do not change the catalog in this patch.

> 
> changes in v6:
> -- split patches and rearrange to keep catalog related files at this patch
> 
> 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))
>   
>   #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
>    * @DPU_PINGPONG_MAX
>    */
>   enum {
> @@ -153,6 +154,7 @@ enum {
>   	DPU_PINGPONG_SPLIT,
>   	DPU_PINGPONG_SLAVE,
>   	DPU_PINGPONG_DITHER,
> +	DPU_PINGPONG_DSC,
>   	DPU_PINGPONG_MAX
>   };
>   

-- 
With best wishes
Dmitry