Re: [PATCH v2 6/6] drm/msm/dsi: fix DSC for the bonded DSI case

[Dmitry Baryshkov]

On Wed, 15 Nov 2023 at 01:00, Jonathan Marek <jonathan@xxxxxxxx> wrote:
>
> 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.
>
> Signed-off-by: Jonathan Marek <jonathan@xxxxxxxx>

Fixes tag?

I'll wait for the Tested-by by Marijn, otherwise LGTM.

> ---
>  drivers/gpu/drm/msm/dsi/dsi.h         |  3 ++-
>  drivers/gpu/drm/msm/dsi/dsi_host.c    | 20 +++++++++++---------
>  drivers/gpu/drm/msm/dsi/dsi_manager.c |  2 +-
>  3 files changed, 14 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/dsi/dsi.h b/drivers/gpu/drm/msm/dsi/dsi.h
> index 28379b1af63f..3a641e69447c 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi.h
> +++ b/drivers/gpu/drm/msm/dsi/dsi.h
> @@ -93,7 +93,8 @@ 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 892a463a7e03..cf06736e5a60 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -940,8 +940,7 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_bonded_dsi)
>                                mode->hdisplay, mode->vdisplay);
>                         return;
>                 }
> -

Nit: keep it please.

> -               dsc->pic_width = mode->hdisplay;
> +               dsc->pic_width = hdisplay;
>                 dsc->pic_height = mode->vdisplay;
>                 DBG("Mode %dx%d\n", dsc->pic_width, dsc->pic_height);
>
> @@ -952,6 +951,11 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_bonded_dsi)
>                 if (ret)
>                         return;
>
> +               if (msm_host->mode_flags & MIPI_DSI_MODE_VIDEO)
> +                       dsi_update_dsc_timing(msm_host, false, hdisplay);
> +               else
> +                       dsi_update_dsc_timing(msm_host, true, hdisplay);
> +
>                 /* Divide the display by 3 but keep back/font porch and
>                  * pulse width same
>                  */
> @@ -968,9 +972,6 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_bonded_dsi)
>         }
>
>         if (msm_host->mode_flags & MIPI_DSI_MODE_VIDEO) {
> -               if (msm_host->dsc)
> -                       dsi_update_dsc_timing(msm_host, false, mode->hdisplay);
> -
>                 dsi_write(msm_host, REG_DSI_ACTIVE_H,
>                         DSI_ACTIVE_H_START(ha_start) |
>                         DSI_ACTIVE_H_END(ha_end));
> @@ -989,9 +990,6 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_bonded_dsi)
>                         DSI_ACTIVE_VSYNC_VPOS_START(vs_start) |
>                         DSI_ACTIVE_VSYNC_VPOS_END(vs_end));
>         } else {                /* command mode */
> -               if (msm_host->dsc)
> -                       dsi_update_dsc_timing(msm_host, true, mode->hdisplay);
> -
>                 /* image data and 1 byte write_memory_start cmd */
>                 if (!msm_host->dsc)
>                         wc = hdisplay * dsi_get_bpp(msm_host->format) / 8 + 1;
> @@ -2479,7 +2477,8 @@ 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;
> @@ -2489,6 +2488,9 @@ 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 896f369fdd53..2ca1a7ca3659 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
> @@ -455,7 +455,7 @@ 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 const struct drm_bridge_funcs dsi_mgr_bridge_funcs = {
> --
> 2.26.1
>


-- 
With best wishes
Dmitry