linux-kernel - Re: [linux-sunxi] [PATCH 10/15] drm/sun4i: Add support for R40 TV TCONs

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Date:   Sun, 20 May 2018 09:30:22 +0200
From:   Jernej Škrabec <jernej.skrabec@...l.net>
To:     Julian Calaby <julian.calaby@...il.com>
Cc:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        devicetree <devicetree@...r.kernel.org>,
        "Mailing List, Arm" <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:COMMON CLK FRAMEWORK" <linux-clk@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [linux-sunxi] [PATCH 10/15] drm/sun4i: Add support for R40 TV TCONs

Hi,

Dne nedelja, 20. maj 2018 ob 04:09:52 CEST je Julian Calaby napisal(a):
> Hi Jernej,
> 
> On Sun, May 20, 2018 at 11:57 AM, Julian Calaby <julian.calaby@...il.com> 
wrote:
> > Hi Jernej,
> > 
> > On Sun, May 20, 2018 at 4:31 AM, Jernej Skrabec <jernej.skrabec@...l.net> 
wrote:
> >> R40 display pipeline has a lot of possible configurations. HDMI can be
> >> connected to 2 different TCONs (out of 4) and mixers can be connected to
> >> any TCON. All this must be configured in TCON TOP.
> >> 
> >> Along with definition of TCON capabilities also add mux callback, which
> >> can configure this complex pipeline.
> >> 
> >> For now, only TCON TV is supported.
> >> 
> >> Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
> >> ---
> >> 
> >>  drivers/gpu/drm/sun4i/sun4i_tcon.c | 39 ++++++++++++++++++++++++++++++
> >>  1 file changed, 39 insertions(+)
> >> 
> >> diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c
> >> b/drivers/gpu/drm/sun4i/sun4i_tcon.c index e0c562ce1c22..81b9551e4f78
> >> 100644
> >> --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
> >> +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
> >> @@ -1274,6 +1274,31 @@ static int sun6i_tcon_set_mux(struct sun4i_tcon
> >> *tcon,>> 
> >>         return 0;
> >>  
> >>  }
> >> 
> >> +static int sun8i_r40_tcon_tv_set_mux(struct sun4i_tcon *tcon,
> >> +                                    const struct drm_encoder *encoder,
> >> +                                    int index)
> >> +{
> >> +       if (encoder->encoder_type == DRM_MODE_ENCODER_TMDS)
> >> +               sun8i_tcon_top_set_hdmi_src(tcon->tcon_top, index);
> >> +
> >> +       sun8i_tcon_top_de_config(tcon->tcon_top, tcon->id,
> >> +                                tcon_type_tv, index);
> >> +
> >> +       return 0;
> >> +}
> >> +
> >> +static int sun8i_r40_tcon_tv_set_mux_0(struct sun4i_tcon *tcon,
> >> +                                      const struct drm_encoder *encoder)
> >> +{
> >> +       return sun8i_r40_tcon_tv_set_mux(tcon, encoder, 0);
> >> +}
> >> +
> >> +static int sun8i_r40_tcon_tv_set_mux_1(struct sun4i_tcon *tcon,
> >> +                                      const struct drm_encoder *encoder)
> >> +{
> >> +       return sun8i_r40_tcon_tv_set_mux(tcon, encoder, 1);
> >> +}
> > 
> > Are TCON-TOPs going to be a common thing in new SoCs from Allwinner?
> > If so, maybe we should add an index to the TCON quirks and have a
> > common TCON-TOP set_mux function.
> 
> Actually, that only moves it up a level. Should it be a devicetree property?
> 

TCON-TOP is besides R40 part of two newest Allwinner SoCs, H6 and A63. 
However, they have only one TV TCON and one LCD TCON, so indexes are not 
needed for them (always 0). This makes R40 somewhat special. I don't think it 
makes sense to expand everything just for one SoC.

Best regards,
Jernej