Re: [linux-sunxi] [PATCH v4 1/2] drm/sun4i: Add mode_set callback to the engine

[Priit Laes <plaes@plaes.org>]

On Fri, May 28, 2021 at 11:30:35PM +0300, Roman Stratiienko wrote:
> Create callback to allow updating engine's registers on mode change.
> 
> Signed-off-by: Roman Stratiienko <r.stratiienko@gmail.com>
> Reviewed-by: Jernej Skrabec <jernej.skrabec@siol.net>
> ---
>  drivers/gpu/drm/sun4i/sun4i_crtc.c   |  3 +++
>  drivers/gpu/drm/sun4i/sunxi_engine.h | 12 ++++++++++++
>  2 files changed, 15 insertions(+)
> 
> diff --git a/drivers/gpu/drm/sun4i/sun4i_crtc.c b/drivers/gpu/drm/sun4i/sun4i_crtc.c
> index 45d9eb552d86..8f01a6b2bbef 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_crtc.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_crtc.c
> @@ -146,6 +146,9 @@ static void sun4i_crtc_mode_set_nofb(struct drm_crtc *crtc)
>  	struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
>  
>  	sun4i_tcon_mode_set(scrtc->tcon, encoder, mode);
> +
> +	if (scrtc->engine->ops->mode_set)
> +		scrtc->engine->ops->mode_set(scrtc->engine, mode);
>  }
>  
>  static const struct drm_crtc_helper_funcs sun4i_crtc_helper_funcs = {
> diff --git a/drivers/gpu/drm/sun4i/sunxi_engine.h b/drivers/gpu/drm/sun4i/sunxi_engine.h
> index 548710a936d5..7faa844646ff 100644
> --- a/drivers/gpu/drm/sun4i/sunxi_engine.h
> +++ b/drivers/gpu/drm/sun4i/sunxi_engine.h
> @@ -9,6 +9,7 @@
>  struct drm_plane;
>  struct drm_device;
>  struct drm_crtc_state;
> +struct drm_display_mode;
>  
>  struct sunxi_engine;
>  
> @@ -108,6 +109,17 @@ struct sunxi_engine_ops {
>  	 * This function is optional.
>  	 */
>  	void (*vblank_quirk)(struct sunxi_engine *engine);
> +
> +	/**
> +	 * @mode_set:
> +	 *
> +	 * This callback is used to update engine registers that
> +	 * responsible for display frame size and other mode attributes.

This sentence needs a little grammatical fixup.

> +	 *
> +	 * This function is optional.
> +	 */
> +	void (*mode_set)(struct sunxi_engine *engine,
> +			 struct drm_display_mode *mode);
>  };
>  
>  /**
> -- 
> 2.30.2
> 
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