linux-kernel - Re: [PATCH v16 1/4] drm/bridge: dw-hdmi: introduce dw_hdmi_enable

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Date:   Thu, 3 Mar 2022 17:23:02 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     "H. Nikolaus Schaller" <hns@...delico.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Robert Foss <robert.foss@...aro.org>,
        Paul Boddie <paul@...die.org.uk>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Paul Cercueil <paul@...pouillou.net>,
        Maxime Ripard <maxime@...no.tech>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
Cc:     letux-kernel@...nphoenux.org, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Jonas Karlman <jonas@...boo.se>
Subject: Re: [PATCH v16 1/4] drm/bridge: dw-hdmi: introduce
 dw_hdmi_enable_poll()

Hi,

On 26/02/2022 18:12, H. Nikolaus Schaller wrote:
> so that specialization drivers like ingenic-dw-hdmi can enable polling.
> 
> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
> ---
>   drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 9 +++++++++
>   include/drm/bridge/dw_hdmi.h              | 1 +
>   2 files changed, 10 insertions(+)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index 4befc104d2200..43e375da131e8 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -3217,6 +3217,15 @@ static int dw_hdmi_parse_dt(struct dw_hdmi *hdmi)
>   	return 0;
>   }
>   
> +void dw_hdmi_enable_poll(struct dw_hdmi *hdmi, bool enable)
> +{
> +	if (hdmi->bridge.dev)
> +		hdmi->bridge.dev->mode_config.poll_enabled = enable;
> +	else
> +		dev_warn(hdmi->dev, "no hdmi->bridge.dev");
> +}
> +EXPORT_SYMBOL_GPL(dw_hdmi_enable_poll);
> +
>   struct dw_hdmi *dw_hdmi_probe(struct platform_device *pdev,
>   			      const struct dw_hdmi_plat_data *plat_data)
>   {
> diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
> index 2a1f85f9a8a3f..963960794b40e 100644
> --- a/include/drm/bridge/dw_hdmi.h
> +++ b/include/drm/bridge/dw_hdmi.h
> @@ -196,5 +196,6 @@ enum drm_connector_status dw_hdmi_phy_read_hpd(struct dw_hdmi *hdmi,
>   void dw_hdmi_phy_update_hpd(struct dw_hdmi *hdmi, void *data,
>   			    bool force, bool disabled, bool rxsense);
>   void dw_hdmi_phy_setup_hpd(struct dw_hdmi *hdmi, void *data);
> +void dw_hdmi_enable_poll(struct dw_hdmi *hdmi, bool enable);
>   
>   #endif /* __IMX_HDMI_H__ */

As I understand, this is because the IRQ line of the dw-hdmi IP isn't connected right ? and you use the display-connector ddc gpio instead ?

In this case I think the Ingenic DRM core should call drm_kms_helper_poll_init(drm) instead.

Neil