linux-kernel - Re: [PATCH v4 25/78] drm/vc4: crtc: Remove mode_set

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Date:   Tue, 28 Jul 2020 11:38:26 +0100
From:   Dave Stevenson <dave.stevenson@...pberrypi.com>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Eric Anholt <eric@...olt.net>,
        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,
        LKML <linux-kernel@...r.kernel.org>,
        Tim Gover <tim.gover@...pberrypi.com>,
        Phil Elwell <phil@...pberrypi.com>
Subject: Re: [PATCH v4 25/78] drm/vc4: crtc: Remove mode_set_nofb

Hi Maxime

On Wed, 8 Jul 2020 at 18:43, Maxime Ripard <maxime@...no.tech> wrote:
>
> On BCM2711 to avoid stale pixels getting stuck in intermediate FIFOs, the
> pixelvalve needs to be setup each time there's a mode change or enable /
> disable sequence.
>
> Therefore, we can't really use mode_set_nofb anymore to configure it, but
> we need to move it to atomic_enable.
>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>

Reviewed-by: Dave Stevenson <dave.stevenson@...pberrypi.com>

> ---
>  drivers/gpu/drm/vc4/vc4_crtc.c | 7 +------
>  1 file changed, 1 insertion(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
> index 284a85b9d7d4..2eda2e6429ec 100644
> --- a/drivers/gpu/drm/vc4/vc4_crtc.c
> +++ b/drivers/gpu/drm/vc4/vc4_crtc.c
> @@ -376,11 +376,6 @@ static void vc4_crtc_config_pv(struct drm_crtc *crtc)
>         }
>  }
>
> -static void vc4_crtc_mode_set_nofb(struct drm_crtc *crtc)
> -{
> -       vc4_crtc_config_pv(crtc);
> -}
> -
>  static void require_hvs_enabled(struct drm_device *dev)
>  {
>         struct vc4_dev *vc4 = to_vc4_dev(dev);
> @@ -433,6 +428,7 @@ static void vc4_crtc_atomic_enable(struct drm_crtc *crtc,
>         require_hvs_enabled(dev);
>
>         vc4_crtc_pixelvalve_reset(crtc);
> +       vc4_crtc_config_pv(crtc);
>
>         CRTC_WRITE(PV_CONTROL, CRTC_READ(PV_CONTROL) | PV_CONTROL_EN);
>
> @@ -791,7 +787,6 @@ static const struct drm_crtc_funcs vc4_crtc_funcs = {
>  };
>
>  static const struct drm_crtc_helper_funcs vc4_crtc_helper_funcs = {
> -       .mode_set_nofb = vc4_crtc_mode_set_nofb,
>         .mode_valid = vc4_crtc_mode_valid,
>         .atomic_check = vc4_crtc_atomic_check,
>         .atomic_flush = vc4_hvs_atomic_flush,
> --
> git-series 0.9.1