linux-kernel - Re: [PATCH v8 09/10] drm/vc4: hdmi: Enable the scrambler on reconnection

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Message-ID: <CAPY8ntCiQ_42mXMYz_TF33TwAArH=o_C9MazuPmKwSosP2qrnQ@mail.gmail.com>
Date:   Tue, 2 Nov 2021 16:51:50 +0000
From:   Dave Stevenson <dave.stevenson@...pberrypi.com>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     DRI Development <dri-devel@...ts.freedesktop.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>,
        linux-rpi-kernel@...ts.infradead.org,
        LKML <linux-kernel@...r.kernel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        bcm-kernel-feedback-list@...adcom.com,
        Emma Anholt <emma@...olt.net>,
        Phil Elwell <phil@...pberrypi.com>,
        Tim Gover <tim.gover@...pberrypi.com>,
        Dom Cobley <dom@...pberrypi.com>
Subject: Re: [PATCH v8 09/10] drm/vc4: hdmi: Enable the scrambler on reconnection

On Mon, 25 Oct 2021 at 16:29, Maxime Ripard <maxime@...no.tech> wrote:
>
> If we have a state already and disconnect/reconnect the display, the
> SCDC messages won't be sent again since we didn't go through a disable /
> enable cycle.
>
> In order to fix this, let's call the vc4_hdmi_enable_scrambling function
> in the detect callback if there is a mode and it needs the scrambler to
> be enabled.
>
> Fixes: c85695a2016e ("drm/vc4: hdmi: Enable the scrambler")
> Signed-off-by: Maxime Ripard <maxime@...no.tech>

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

> ---
>  drivers/gpu/drm/vc4/vc4_hdmi.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> index d36b3b6ebed1..fab9b93e1b84 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> @@ -180,6 +180,8 @@ static void vc4_hdmi_cec_update_clk_div(struct vc4_hdmi *vc4_hdmi)
>  static void vc4_hdmi_cec_update_clk_div(struct vc4_hdmi *vc4_hdmi) {}
>  #endif
>
> +static void vc4_hdmi_enable_scrambling(struct drm_encoder *encoder);
> +
>  static enum drm_connector_status
>  vc4_hdmi_connector_detect(struct drm_connector *connector, bool force)
>  {
> @@ -216,6 +218,7 @@ vc4_hdmi_connector_detect(struct drm_connector *connector, bool force)
>                         }
>                 }
>
> +               vc4_hdmi_enable_scrambling(&vc4_hdmi->encoder.base.base);
>                 pm_runtime_put(&vc4_hdmi->pdev->dev);
>                 mutex_unlock(&vc4_hdmi->mutex);
>                 return connector_status_connected;
> --
> 2.31.1
>