linux-kernel - Re: [PATCH v3 2/7] drm/msm/dpu: add DPU_PINGPONG

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Date:   Wed, 3 May 2023 00:19:47 +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_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 v3 2/7] drm/msm/dpu: add DPU_PINGPONG_DSC feature bit

On 03/05/2023 00:02, Kuogee Hsieh wrote:
> Legacy DPU requires PP block to be involved during DSC setting up.
> This patch adds DDPU_PINGPONG_DSC feature bit to indicate that both

DPU_PINGPONG_DSC

> dpu_hw_pp_setup_dsc() and dpu_hw_pp_dsc_enable() pingpong ops
> functions are required to complete DSC data path set up and start
> DSC engine.

Nit: as these ops were already present, I'd say that the lack of the 
flag means that these operations are not supported and must not be 
called for DSC setup/teardown.

Nevertheless:

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

> 
> Reported-by : Marijn Suijten <marijn.suijten@...ainline.org>
> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h  | 2 ++
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c | 9 ++++++---
>   2 files changed, 8 insertions(+), 3 deletions(-)
> 
> 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 71584cd..c07a6b6 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> @@ -144,6 +144,7 @@ enum {
>    * @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_DSC,	    PP ops functions required for DSC
>    * @DPU_PINGPONG_MAX
>    */
>   enum {
> @@ -152,6 +153,7 @@ 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 3822e06..f255a04 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c
> @@ -264,9 +264,12 @@ static void _setup_pingpong_ops(struct dpu_hw_pingpong *c,
>   	c->ops.get_autorefresh = dpu_hw_pp_get_autorefresh_config;
>   	c->ops.poll_timeout_wr_ptr = dpu_hw_pp_poll_timeout_wr_ptr;
>   	c->ops.get_line_count = dpu_hw_pp_get_line_count;
> -	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 (features & BIT(DPU_PINGPONG_DSC)) {
> +		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;

-- 
With best wishes
Dmitry