linux-kernel - Re: [PATCH 07/21] drm/msm/dpu: Support dynamic DSC number

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Message-ID: <CAA8EJpqZjO9rfVgVkhyCpg9qfyc13MHtz=RRhZG6ihMsVM+bSA@mail.gmail.com>
Date: Thu, 29 Aug 2024 14:10:15 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Jun Nie <jun.nie@...aro.org>
Cc: Rob Clark <robdclark@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>, 
	Sean Paul <sean@...rly.run>, Marijn Suijten <marijn.suijten@...ainline.org>, 
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, linux-arm-msm@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/21] drm/msm/dpu: Support dynamic DSC number

On Thu, 29 Aug 2024 at 13:20, Jun Nie <jun.nie@...aro.org> wrote:
>
> Do not assume DSC number as 2. Because there are 4 DSC in
> quad pipe case.

Please expand the commit message. You prefer brevity, but your
comments lack clarifications.

>
> Signed-off-by: Jun Nie <jun.nie@...aro.org>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index 6bdd9c21ff3ed..05b203be2a9bc 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -553,9 +553,9 @@ bool dpu_encoder_use_dsc_merge(struct drm_encoder *drm_enc)
>                 if (dpu_enc->phys_encs[i])
>                         intf_count++;
>
> -       /* See dpu_encoder_get_topology, we only support 2:2:1 topology */
> +       /* DSC and mixer are mapped 1:1, so reuse the mixer number */

Why? DSCmerge is a valid topology even if it is not supported yet.

>         if (dpu_enc->dsc)
> -               num_dsc = 2;
> +               num_dsc = dpu_crtc_get_lm_num(drm_enc->crtc->state);
>
>         return (num_dsc > 0) && (num_dsc > intf_count);
>  }
>
> --
> 2.34.1
>


-- 
With best wishes
Dmitry