linux-kernel - Re: [PATCH v2 1/7] drm/sun4i: tcon: Pass encoder instead of using panel for RGB setup

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Message-ID: <48d864c0da9200ff052ec0cc0879d7b00de23b7a.camel@paulk.fr>
Date:   Mon, 05 Nov 2018 11:21:09 +0100
From:   Paul Kocialkowski <contact@...lk.fr>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Chen-Yu Tsai <wens@...e.org>, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v2 1/7] drm/sun4i: tcon: Pass encoder instead of using
 panel for RGB setup

Hi,

Le lundi 05 novembre 2018 à 09:59 +0100, Maxime Ripard a écrit :
> Hi,
> 
> On Thu, Nov 01, 2018 at 09:00:39PM +0100, Paul Kocialkowski wrote:
> > Features such as dithering and pixel data edge configuration currently
> > rely on the panel registered with the TCON driver. However, bridges are
> > also supported in addition panels.
> > 
> > Instead of retrieving the connector from the panel, pass the encoder
> > from the calling function, as is done for other interfaces.
> > 
> > The connector is then retrieved from the encoder with the dedicated
> > helper. Even in the case of bridges, the connector is registered with
> > the encoder from our driver and is accessible when iterating connectors.
> > 
> > Signed-off-by: Paul Kocialkowski <contact@...lk.fr>
> > ---
> >  drivers/gpu/drm/sun4i/sun4i_tcon.c | 22 +++++++++-------------
> >  1 file changed, 9 insertions(+), 13 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
> > index f949287d926c..262ffb6b0f82 100644
> > --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
> > +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
> > @@ -478,8 +478,11 @@ static void sun4i_tcon0_mode_set_lvds(struct sun4i_tcon *tcon,
> >  }
> >  
> >  static void sun4i_tcon0_mode_set_rgb(struct sun4i_tcon *tcon,
> > +				     const struct drm_encoder *encoder,
> >  				     const struct drm_display_mode *mode)
> >  {
> > +	struct drm_connector *connector = sun4i_tcon_get_connector(encoder);
> > +	struct drm_display_info display_info = connector->display_info;
> >  	unsigned int bp, hsync, vsync;
> >  	u8 clk_delay;
> >  	u32 val = 0;
> > @@ -491,8 +494,7 @@ static void sun4i_tcon0_mode_set_rgb(struct sun4i_tcon *tcon,
> >  	sun4i_tcon0_mode_set_common(tcon, mode);
> >  
> >  	/* Set dithering if needed */
> > -	if (tcon->panel)
> > -		sun4i_tcon0_mode_set_dithering(tcon, tcon->panel->connector);
> > +	sun4i_tcon0_mode_set_dithering(tcon, connector);
> >  
> >  	/* Adjust clock delay */
> >  	clk_delay = sun4i_tcon_get_clk_delay(mode, 0);
> > @@ -556,17 +558,11 @@ static void sun4i_tcon0_mode_set_rgb(struct sun4i_tcon *tcon,
> >  	 * Following code is a way to avoid quirks all around TCON
> >  	 * and DOTCLOCK drivers.
> >  	 */
> > -	if (tcon->panel) {
> > -		struct drm_panel *panel = tcon->panel;
> > -		struct drm_connector *connector = panel->connector;
> > -		struct drm_display_info display_info = connector->display_info;
> > -
> > -		if (display_info.bus_flags & DRM_BUS_FLAG_PIXDATA_POSEDGE)
> > -			clk_set_phase(tcon->dclk, 240);
> > +	if (display_info.bus_flags & DRM_BUS_FLAG_PIXDATA_POSEDGE)
> > +		clk_set_phase(tcon->dclk, 240);
> >  
> > -		if (display_info.bus_flags & DRM_BUS_FLAG_PIXDATA_NEGEDGE)
> > -			clk_set_phase(tcon->dclk, 0);
> > -	}
> > +	if (display_info.bus_flags & DRM_BUS_FLAG_PIXDATA_NEGEDGE)
> > +		clk_set_phase(tcon->dclk, 0);
> 
> You're doing multiple things here: you're changing the function API,
> and then moving the display info checks outside of the tcon->panel
> condition.
> 
> You should do two separate patches for that.

Thanks, I'll do that in the next revision then.

Cheers,

Paul

-- 
Developer of free digital technology and hardware support.

Website: https://www.paulk.fr/
Coding blog: https://code.paulk.fr/
Git repositories: https://git.paulk.fr/ https://git.code.paulk.fr/

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