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

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Date:   Fri, 14 Jun 2019 17:36:26 +0530
From:   Jagan Teki <jagan@...rulasolutions.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Maxime Ripard <maxime.ripard@...tlin.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        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>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Michael Trimarchi <michael@...rulasolutions.com>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        linux-amarula <linux-amarula@...rulasolutions.com>
Subject: Re: [linux-sunxi] [PATCH 2/9] drm/sun4i: tcon: Add TCON LCD support
 for R40

On Fri, Jun 14, 2019 at 4:32 PM Chen-Yu Tsai <wens@...e.org> wrote:
>
> On Fri, Jun 14, 2019 at 6:56 PM Jagan Teki <jagan@...rulasolutions.com> wrote:
> >
> > On Fri, Jun 14, 2019 at 9:05 AM Chen-Yu Tsai <wens@...e.org> wrote:
> > >
> > > On Fri, Jun 14, 2019 at 11:19 AM Chen-Yu Tsai <wens@...e.org> wrote:
> > > >
> > > > On Fri, Jun 14, 2019 at 2:53 AM Jagan Teki <jagan@...rulasolutions.com> 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>
> > > >
> > > > Reviewed-by: Chen-Yu Tsai <wens@...e.org>
> > >
> > > I take that back.
> > >
> > > The TCON output muxing (which selects whether TCON LCD or TCON TV
> > > outputs to the GPIO pins)
> > > is not supported yet. Please at least add TODO notes, or ideally,
> >
> > Are you referring about port selection? it is support in
> > sun8i_tcon_top_de_config.
>
> No. That's supported as you already pointed out. That only selects
> which mixer outputs to which TCON.
>
> I'm talking about the GPIOD and GPIOH bits, which select which of
> LCD or TV TCON outputs to the LCD function pins. Keep in mind that
> the TV TCON's H/V SYNC signals are used in combination with the
> TV encoder RGB outputs for VGA.

Got it, so do I need to add TODO on sun8i_r40_lcd_quirks struct?