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

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Date:   Mon, 31 May 2021 19:48:33 +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: Re: [PATCH v4 1/2] drm/sun4i: Add mode_set callback to the engine

Dne ponedeljek, 31. maj 2021 ob 19:24:40 CEST je Jernej Škrabec napisal(a):
> 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>

BTW,  update my R-B tag with gmail address and fix issues pointed out by Plaes 
and me in order to use it.

> > ---
> >  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
> 
> >  };
> >  
> >  /**
> > 
> 
> 
>