linux-kernel - Re: [PATCH v4 1/2] drm/sun4i: Add mode

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Date:   Mon, 31 May 2021 19:24:40 +0200
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     linux-kernel@...r.kernel.org,
        Roman Stratiienko <r.stratiienko@...il.com>
Cc:     mripard@...nel.org, wens@...e.org, jernej.skrabec@...l.net,
        megous@...ous.com, linux-sunxi@...glegroups.com,
        dri-devel@...ts.freedesktop.org,
        Roman Stratiienko <r.stratiienko@...il.com>
Subject: Re: [PATCH v4 1/2] drm/sun4i: Add mode_set callback to the engine

Hi!

Dne petek, 28. maj 2021 ob 22:30:35 CEST je Roman Stratiienko napisal(a):
> Create callback to allow updating engine's registers on mode change.
> 
> Signed-off-by: Roman Stratiienko <r.stratiienko@...il.com>
> Reviewed-by: Jernej Skrabec <jernej.skrabec@...l.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 function is optional.
> +	 */
> +	void (*mode_set)(struct sunxi_engine *engine,
> +			 struct drm_display_mode *mode);

Mark mode as const.

Best regards,
Jernej

>  };
>  
>  /**
>