linux-kernel - Re: [PATCH v5 2/7] drm/msm/dpu: add DPU_PINGPONG

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Message-ID: <e42qmaqhejk6gcnhgtbuztmowsxqg6tcq6snvuikibximazfmm@jimsewkykwnt>
Date:   Thu, 4 May 2023 19:35:55 +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_sbillaka@...cinc.com, freedreno@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/7] drm/msm/dpu: add DPU_PINGPONG_DSC feature bit

On 2023-05-04 09:46:40, Kuogee Hsieh wrote:
> DPU < 7.0.0 requires the  PINGPONG block to be involved during

Nit: double space.

> DSC setting up. Since DPU < 7.0.0, enabling and starting the DSC

That should be >=.

> encoder engine 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.
> Existing call-sites to these callbacks already skip calling into
> them if the function pointer is NULL.
> 
> Changes in v4:
> -- add more details commit text
> 
> Changes in v5:
> -- reword commit text suggested by Marijn
> -- delet comma
> -- use test_bit()
> 
> Reported-by: Marijn Suijten <marijn.suijten@...ainline.org>
> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

This patch isn't strictly bisectable, but I'll explain in patch 3/7.
After addressing the '<' -> '>=' typo above, this is:

Reviewed-by: Marijn Suijten <marijn.suijten@...ainline.org>

> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h  | 4 +++-
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c | 6 ++++++
>  2 files changed, 9 insertions(+), 1 deletion(-)
> 
> 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
>  };
>  
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c
> index 79e4576..e7f47a4 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c
> @@ -295,6 +295,12 @@ static void _setup_pingpong_ops(struct dpu_hw_pingpong *c,
>  	c->ops.enable_dsc = dpu_hw_pp_dsc_enable;
>  	c->ops.disable_dsc = dpu_hw_pp_dsc_disable;
>  
> +	if (test_bit(DPU_PINGPONG_DSC, &features)) {
> +		c->ops.setup_dsc = dpu_hw_pp_setup_dsc;
> +		c->ops.enable_dsc = dpu_hw_pp_dsc_enable;
> +		c->ops.disable_dsc = dpu_hw_pp_dsc_disable;
> +	}
> +
>  	if (test_bit(DPU_PINGPONG_DITHER, &features))
>  		c->ops.setup_dither = dpu_hw_pp_setup_dither;
>  };
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>