linux-kernel - Re: [PATCH 12/15] drm/vc4: hdmi: Don't register the CEC adapter if there's no interrupts

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Date:   Fri, 18 Dec 2020 14:29:14 +0000
From:   Dave Stevenson <dave.stevenson@...pberrypi.com>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     Eric Anholt <eric@...olt.net>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Jason Cooper <jason@...edaemon.net>,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org,
        Marc Zyngier <maz@...nel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        LKML <linux-kernel@...r.kernel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-rpi-kernel@...ts.infradead.org,
        DRI Development <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH 12/15] drm/vc4: hdmi: Don't register the CEC adapter if
 there's no interrupts

On Thu, 10 Dec 2020 at 13:47, Maxime Ripard <maxime@...no.tech> wrote:
>
> We introduced the BCM2711 support to the vc4 HDMI controller with 5.10,
> but this was lacking any of the interrupts of the CEC controller so we
> have to deal with the backward compatibility.
>
> Do so by simply ignoring the CEC setup if the DT doesn't have the
> interrupts property.
>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>

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

> ---
>  drivers/gpu/drm/vc4/vc4_hdmi.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> index 327638d93032..69217c68d3a4 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> @@ -1655,9 +1655,15 @@ static int vc4_hdmi_cec_init(struct vc4_hdmi *vc4_hdmi)
>  {
>         struct cec_connector_info conn_info;
>         struct platform_device *pdev = vc4_hdmi->pdev;
> +       struct device *dev = &pdev->dev;
>         u32 value;
>         int ret;
>
> +       if (!of_find_property(dev->of_node, "interrupts", NULL)) {
> +               dev_warn(dev, "'interrupts' DT property is missing, no CEC\n");
> +               return 0;
> +       }
> +
>         vc4_hdmi->cec_adap = cec_allocate_adapter(&vc4_hdmi_cec_adap_ops,
>                                                   vc4_hdmi, "vc4",
>                                                   CEC_CAP_DEFAULTS |
> --
> 2.28.0
>