linux-kernel - Re: [PATCH v3 2/9] drm/sun4i: tcon: Add TCON LCD support for R40

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Message-ID: <CAMty3ZA0e8eJZWvAh0x=KGAZVL3apdao3COvR6j3-ckv0cdvcg@mail.gmail.com>
Date:   Thu, 2 Jan 2020 21:10:31 +0530
From:   Jagan Teki <jagan@...rulasolutions.com>
To:     Maxime Ripard <mripard@...nel.org>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Rob Herring <robh+dt@...nel.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Mark Rutland <mark.rutland@....com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        linux-amarula <linux-amarula@...rulasolutions.com>
Subject: Re: [PATCH v3 2/9] drm/sun4i: tcon: Add TCON LCD support for R40

On Thu, Jan 2, 2020 at 4:24 PM Maxime Ripard <mripard@...nel.org> wrote:
>
> On Tue, Dec 31, 2019 at 06:35:21PM +0530, Jagan Teki wrote:
> > TCON LCD0, LCD1 in allwinner R40, are used for managing
> > LCD interfaces like RGB, LVDS and DSI.
> >
> > Like TCON TV0, TV1 these LCD0, LCD1 are also managed via
> > tcon top.
> >
> > Add support for it, in tcon driver.
> >
> > Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
> > ---
> > Changes for v3:
> > - none
> >
> >  drivers/gpu/drm/sun4i/sun4i_tcon.c | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
> > index fad72799b8df..69611d38c844 100644
> > --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
> > +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
> > @@ -1470,6 +1470,13 @@ static const struct sun4i_tcon_quirks sun8i_a83t_tv_quirks = {
> >       .has_channel_1          = true,
> >  };
> >
> > +static const struct sun4i_tcon_quirks sun8i_r40_lcd_quirks = {
> > +     .supports_lvds          = true,
> > +     .has_channel_0          = true,
> > +     /* TODO Need to support TCON output muxing via GPIO pins */
> > +     .set_mux                = sun8i_r40_tcon_tv_set_mux,
>
> What is this muking about? And why is it a TODO?

Muxing similar like how TCON TOP handle TV0, TV1 I have reused the
same so-that it would configure de port selection via
sun8i_tcon_top_de_config

TCON output muxing have gpio with GPIOD and GPIOH bits, which select
which of LCD or TV TCON outputs to the LCD function pins. I have
marked these has TODO for further support as mentioned by Chen-Yu in
v1[1].

[1] https://patchwork.freedesktop.org/patch/310210/?series=62062&rev=1