linux-kernel - Re: [PATCH 02/21] drm/msm/dsi: fix DSC width for the bonded DSI case

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Message-ID: <CAA8EJpp_LWmuN8CFuQEAME-O44_wJXUKsR1QwahuigzSss5Rqw@mail.gmail.com>
Date: Thu, 29 Aug 2024 13:54:38 +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, Jonathan Marek <jonathan@...ek.ca>
Subject: Re: [PATCH 02/21] drm/msm/dsi: fix DSC width for the bonded DSI case

On Thu, 29 Aug 2024 at 13:19, Jun Nie <jun.nie@...aro.org> wrote:
>
> From: Jonathan Marek <jonathan@...ek.ca>
>
> For the bonded DSI case, DSC pic_width and timing calculations should use
> the width of a single panel instead of the total combined width.

What is a "single panel"? Please rephrase the commit message so that
it reads logically.

>
> Bonded DSI can be used to drive a single panel having two input
> channels, or to drive two panels with a input channel on every panel that
> behave like single panel for display controller.

Missing actual action. See Documentation/process/submitting-patches.rst

>
> Signed-off-by: Jonathan Marek <jonathan@...ek.ca>

As pointed out during internal review, missing Fixes tag. Any reason
for ignoring it?

> Signed-off-by: Jun Nie <jun.nie@...aro.org>
> ---
>  drivers/gpu/drm/msm/dsi/dsi.h         | 3 ++-
>  drivers/gpu/drm/msm/dsi/dsi_host.c    | 6 +++++-
>  drivers/gpu/drm/msm/dsi/dsi_manager.c | 2 +-
>  3 files changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/dsi/dsi.h b/drivers/gpu/drm/msm/dsi/dsi.h
> index 87496db203d6c..35b90c462f637 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi.h
> +++ b/drivers/gpu/drm/msm/dsi/dsi.h
> @@ -79,7 +79,8 @@ int msm_dsi_host_power_off(struct mipi_dsi_host *host);
>  int msm_dsi_host_set_display_mode(struct mipi_dsi_host *host,
>                                   const struct drm_display_mode *mode);
>  enum drm_mode_status msm_dsi_host_check_dsc(struct mipi_dsi_host *host,
> -                                           const struct drm_display_mode *mode);
> +                                           const struct drm_display_mode *mode,
> +                                           bool is_bonded_dsi);
>  unsigned long msm_dsi_host_get_mode_flags(struct mipi_dsi_host *host);
>  int msm_dsi_host_register(struct mipi_dsi_host *host);
>  void msm_dsi_host_unregister(struct mipi_dsi_host *host);
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index 6388bb12696ff..7a4d9c071be5a 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -2489,7 +2489,8 @@ int msm_dsi_host_set_display_mode(struct mipi_dsi_host *host,
>  }
>
>  enum drm_mode_status msm_dsi_host_check_dsc(struct mipi_dsi_host *host,
> -                                           const struct drm_display_mode *mode)
> +                                           const struct drm_display_mode *mode,
> +                                           bool is_bonded_dsi)
>  {
>         struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
>         struct drm_dsc_config *dsc = msm_host->dsc;
> @@ -2499,6 +2500,9 @@ enum drm_mode_status msm_dsi_host_check_dsc(struct mipi_dsi_host *host,
>         if (!msm_host->dsc)
>                 return MODE_OK;
>
> +       if (is_bonded_dsi)
> +               pic_width = mode->hdisplay / 2;
> +
>         if (pic_width % dsc->slice_width) {
>                 pr_err("DSI: pic_width %d has to be multiple of slice %d\n",
>                        pic_width, dsc->slice_width);
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c
> index a210b7c9e5ca2..6e915b57e14bb 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
> @@ -420,7 +420,7 @@ static enum drm_mode_status dsi_mgr_bridge_mode_valid(struct drm_bridge *bridge,
>                         return MODE_ERROR;
>         }
>
> -       return msm_dsi_host_check_dsc(host, mode);
> +       return msm_dsi_host_check_dsc(host, mode, IS_BONDED_DSI());
>  }
>
>  static int dsi_mgr_bridge_attach(struct drm_bridge *bridge,
>
> --
> 2.34.1
>


-- 
With best wishes
Dmitry