linux-kernel - Re: [PATCH v3 059/105] drm/vc4: crtc: Add BCM2711 pixelvalves

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Message-ID: <CADaigPXm-ap=FxVV0_BPJmoL7A2cteVcD+EU3i954ParbyP7wA@mail.gmail.com>
Date:   Wed, 27 May 2020 12:24:43 -0700
From:   Eric Anholt <eric@...olt.net>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        linux-rpi-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Tim Gover <tim.gover@...pberrypi.com>,
        Phil Elwell <phil@...pberrypi.com>
Subject: Re: [PATCH v3 059/105] drm/vc4: crtc: Add BCM2711 pixelvalves

On Wed, May 27, 2020 at 8:50 AM Maxime Ripard <maxime@...no.tech> wrote:
>
> The BCM2711 has 5 pixelvalves, so now that our driver is ready, let's add
> support for them.
>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>
> ---
>  drivers/gpu/drm/vc4/vc4_crtc.c | 84 ++++++++++++++++++++++++++++++++++-
>  drivers/gpu/drm/vc4/vc4_regs.h |  6 +++-
>  2 files changed, 88 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
> index 9efd7cb25590..a577ed8f929f 100644
> --- a/drivers/gpu/drm/vc4/vc4_crtc.c
> +++ b/drivers/gpu/drm/vc4/vc4_crtc.c
> @@ -229,6 +229,13 @@ static u32 vc4_get_fifo_full_level(struct vc4_crtc *vc4_crtc, u32 format)
>         case PV_CONTROL_FORMAT_24:
>         case PV_CONTROL_FORMAT_DSIV_24:
>         default:
> +               /*
> +                * For some reason, the pixelvalve4 doesn't work with
> +                * the usual formula and will only work with 32.
> +                */
> +               if (vc4_crtc->data->hvs_output == 5)
> +                       return 32;
> +
>                 return fifo_len_bytes - 3 * HVS_FIFO_LATENCY_PIX;
>         }
>  }
> @@ -237,9 +244,14 @@ static u32 vc4_crtc_get_fifo_full_level_bits(struct vc4_crtc *vc4_crtc,
>                                              u32 format)
>  {
>         u32 level = vc4_get_fifo_full_level(vc4_crtc, format);
> +       u32 ret = 0;
>
> -       return VC4_SET_FIELD(level & 0x3f,
> -                            PV_CONTROL_FIFO_LEVEL);
> +       if (level > 0x3f)
> +               ret |= VC4_SET_FIELD((level >> 6) & 0x3,
> +                                    PV5_CONTROL_FIFO_LEVEL_HIGH);
> +

I would drop the conditional here (ORing in zero is fine), and also
the & 3 because it would be good to get a warning if you picked a fifo
full level that doesn't fit in the field.

> +       return ret | VC4_SET_FIELD(level & 0x3f,
> +                                  PV_CONTROL_FIFO_LEVEL);
>  }
>
>  /*
> @@ -277,6 +289,8 @@ static void vc4_crtc_pixelvalve_reset(struct drm_crtc *crtc)
>
>  static void vc4_crtc_config_pv(struct drm_crtc *crtc)
>  {
> +       struct drm_device *dev = crtc->dev;
> +       struct vc4_dev *vc4 = to_vc4_dev(dev);
>         struct drm_encoder *encoder = vc4_get_crtc_encoder(crtc);
>         struct vc4_encoder *vc4_encoder = to_vc4_encoder(encoder);
>         struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
> @@ -356,6 +370,10 @@ static void vc4_crtc_config_pv(struct drm_crtc *crtc)
>         if (is_dsi)
>                 CRTC_WRITE(PV_HACT_ACT, mode->hdisplay * pixel_rep);
>
> +       if (vc4->hvs->hvs5)
> +               CRTC_WRITE(PV_MUX_CFG,
> +                          VC4_SET_FIELD(8, PV_MUX_CFG_RGB_PIXEL_MUX_MODE));

Can we get some #defines in the reg header instead of a magic value?

Other than that, r-b.