linux-kernel - Re: [PATCH v4 72/78] drm/vc4: hdmi: Do the VID

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Date:   Tue, 28 Jul 2020 16:06:48 +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 72/78] drm/vc4: hdmi: Do the VID_CTL configuration at once

Hi Maxime

On Wed, 8 Jul 2020 at 18:44, Maxime Ripard <maxime@...no.tech> wrote:
>
> The VID_CTL setup is done in several places in the driver even though it's
> not really required. Let's simplify it a bit to do the configuration in one
> go.
>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>

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

> ---
>  drivers/gpu/drm/vc4/vc4_hdmi.c | 14 ++++++--------
>  1 file changed, 6 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> index bbe521ab000b..f56a718a3643 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> @@ -428,10 +428,6 @@ static void vc4_hdmi_set_timings(struct vc4_hdmi *vc4_hdmi,
>
>         HDMI_WRITE(HDMI_VERTB0, vertb_even);
>         HDMI_WRITE(HDMI_VERTB1, vertb);
> -
> -       HDMI_WRITE(HDMI_VID_CTL,
> -                  (vsync_pos ? 0 : VC4_HD_VID_CTL_VSYNC_LOW) |
> -                  (hsync_pos ? 0 : VC4_HD_VID_CTL_HSYNC_LOW));
>  }
>
>  static void vc4_hdmi_recenter_fifo(struct vc4_hdmi *vc4_hdmi)
> @@ -520,8 +516,6 @@ static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder)
>         if (vc4_hdmi->variant->phy_init)
>                 vc4_hdmi->variant->phy_init(vc4_hdmi, mode);
>
> -       HDMI_WRITE(HDMI_VID_CTL, 0);
> -
>         HDMI_WRITE(HDMI_SCHEDULER_CONTROL,
>                    HDMI_READ(HDMI_SCHEDULER_CONTROL) |
>                    VC4_HDMI_SCHEDULER_CONTROL_MANUAL_FORMAT |
> @@ -555,15 +549,19 @@ static void vc4_hdmi_encoder_pre_crtc_enable(struct drm_encoder *encoder)
>
>  static void vc4_hdmi_encoder_post_crtc_enable(struct drm_encoder *encoder)
>  {
> +       struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
>         struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
>         struct vc4_hdmi_encoder *vc4_encoder = to_vc4_hdmi_encoder(encoder);
> +       bool hsync_pos = mode->flags & DRM_MODE_FLAG_PHSYNC;
> +       bool vsync_pos = mode->flags & DRM_MODE_FLAG_PVSYNC;
>         int ret;
>
>         HDMI_WRITE(HDMI_VID_CTL,
> -                  HDMI_READ(HDMI_VID_CTL) |
>                    VC4_HD_VID_CTL_ENABLE |
>                    VC4_HD_VID_CTL_UNDERFLOW_ENABLE |
> -                  VC4_HD_VID_CTL_FRAME_COUNTER_RESET);
> +                  VC4_HD_VID_CTL_FRAME_COUNTER_RESET |
> +                  (vsync_pos ? 0 : VC4_HD_VID_CTL_VSYNC_LOW) |
> +                  (hsync_pos ? 0 : VC4_HD_VID_CTL_HSYNC_LOW));
>
>         if (vc4_encoder->hdmi_monitor) {
>                 HDMI_WRITE(HDMI_SCHEDULER_CONTROL,
> --
> git-series 0.9.1