linux-kernel - Re: [PATCH v2 10/20] drm/sun4i: tcon: Move the muxing out of the mode set function

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Message-ID: <CAGb2v65Lz165B1hwk-x6T7DyPPupi1CwoGT7pHE4WvHKtsMi1Q@mail.gmail.com>
Date:   Thu, 4 May 2017 11:54:09 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     Mike Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH v2 10/20] drm/sun4i: tcon: Move the muxing out of the mode
 set function

On Wed, May 3, 2017 at 7:59 PM, Maxime Ripard
<maxime.ripard@...e-electrons.com> wrote:
> The muxing can actually happen on both channels on some SoCs, so it makes
> more sense to just move it out of the sun4i_tcon1_mode_set function and
> create a separate function that needs to be called by the encoders.
>
> Let's do that and convert the existing drivers.
>
> Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> ---
>  drivers/gpu/drm/sun4i/sun4i_rgb.c  |  1 +
>  drivers/gpu/drm/sun4i/sun4i_tcon.c | 22 ++++++++++++++++------
>  drivers/gpu/drm/sun4i/sun4i_tcon.h |  2 ++
>  drivers/gpu/drm/sun4i/sun4i_tv.c   |  1 +
>  4 files changed, 20 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/sun4i/sun4i_rgb.c b/drivers/gpu/drm/sun4i/sun4i_rgb.c
> index 67f0b91a99de..3003d290c635 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_rgb.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_rgb.c
> @@ -175,6 +175,7 @@ static void sun4i_rgb_encoder_mode_set(struct drm_encoder *encoder,
>         struct sun4i_tcon *tcon = rgb->tcon;
>
>         sun4i_tcon0_mode_set(tcon, mode);
> +       sun4i_tcon_set_mux(tcon, 0, encoder);
>
>         clk_set_rate(tcon->dclk, mode->crtc_clock * 1000);
>
> diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
> index 66a5bb9b85e9..0204d9fadb66 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
> @@ -108,6 +108,22 @@ void sun4i_tcon_enable_vblank(struct sun4i_tcon *tcon, bool enable)
>  }
>  EXPORT_SYMBOL(sun4i_tcon_enable_vblank);
>
> +void sun4i_tcon_set_mux(struct sun4i_tcon *tcon, int channel,
> +                       struct drm_encoder *encoder)

The channel doesn't really matter. What is needed is which TCON and encoder
are supposed to be muxed together. This is going to be per SoC type anyway.

I have something in the works, though it's not finished yet.
I think this works for now.

Acked-by: Chen-Yu Tsai <wens@...e.org>

> +{
> +       if (!tcon->quirks->has_unknown_mux)
> +               return;
> +
> +       if (channel != 1)
> +               return;
> +
> +       /*
> +        * FIXME: Undocumented bits
> +        */
> +       regmap_write(tcon->regs, SUN4I_TCON_MUX_CTRL_REG, 1);
> +}
> +EXPORT_SYMBOL(sun4i_tcon_set_mux);
> +
>  static int sun4i_tcon_get_clk_delay(struct drm_display_mode *mode,
>                                     int channel)
>  {
> @@ -266,12 +282,6 @@ void sun4i_tcon1_mode_set(struct sun4i_tcon *tcon,
>         regmap_update_bits(tcon->regs, SUN4I_TCON_GCTL_REG,
>                            SUN4I_TCON_GCTL_IOMAP_MASK,
>                            SUN4I_TCON_GCTL_IOMAP_TCON1);
> -
> -       /*
> -        * FIXME: Undocumented bits
> -        */
> -       if (tcon->quirks->has_unknown_mux)
> -               regmap_write(tcon->regs, SUN4I_TCON_MUX_CTRL_REG, 1);
>  }
>  EXPORT_SYMBOL(sun4i_tcon1_mode_set);
>
> diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.h b/drivers/gpu/drm/sun4i/sun4i_tcon.h
> index f636343a935d..0350936b413c 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_tcon.h
> +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.h
> @@ -190,6 +190,8 @@ void sun4i_tcon_enable_vblank(struct sun4i_tcon *tcon, bool enable);
>  /* Mode Related Controls */
>  void sun4i_tcon_switch_interlace(struct sun4i_tcon *tcon,
>                                  bool enable);
> +void sun4i_tcon_set_mux(struct sun4i_tcon *tcon, int channel,
> +                       struct drm_encoder *encoder);
>  void sun4i_tcon0_mode_set(struct sun4i_tcon *tcon,
>                           struct drm_display_mode *mode);
>  void sun4i_tcon1_mode_set(struct sun4i_tcon *tcon,
> diff --git a/drivers/gpu/drm/sun4i/sun4i_tv.c b/drivers/gpu/drm/sun4i/sun4i_tv.c
> index 49c49431a053..03c494b8159c 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_tv.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_tv.c
> @@ -393,6 +393,7 @@ static void sun4i_tv_mode_set(struct drm_encoder *encoder,
>         const struct tv_mode *tv_mode = sun4i_tv_find_tv_by_mode(mode);
>
>         sun4i_tcon1_mode_set(tcon, mode);
> +       sun4i_tcon_set_mux(tcon, 1, encoder);
>
>         /* Enable and map the DAC to the output */
>         regmap_update_bits(tv->regs, SUN4I_TVE_EN_REG,
> --
> git-series 0.8.11