linux-kernel - Re: [PATCH 8/9] drm/rockchip: inno-hdmi: handle unsupported InfoFrames

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Message-Id: <DD3HR1AGS7HT.2D858FUG2L2YB@cknow.org>
Date: Sat, 27 Sep 2025 11:56:07 +0200
From: "Diederik de Haas" <didi.debian@...ow.org>
To: "Dmitry Baryshkov" <dmitry.baryshkov@....qualcomm.com>, "Maarten
 Lankhorst" <maarten.lankhorst@...ux.intel.com>, "Maxime Ripard"
 <mripard@...nel.org>, "Thomas Zimmermann" <tzimmermann@...e.de>, "David
 Airlie" <airlied@...il.com>, "Simona Vetter" <simona@...ll.ch>, "Liu Ying"
 <victor.liu@....com>, "Andrzej Hajda" <andrzej.hajda@...el.com>, "Neil
 Armstrong" <neil.armstrong@...aro.org>, "Robert Foss" <rfoss@...nel.org>,
 "Laurent Pinchart" <Laurent.pinchart@...asonboard.com>, "Jonas Karlman"
 <jonas@...boo.se>, "Jernej Skrabec" <jernej.skrabec@...il.com>, "Rob Clark"
 <robin.clark@....qualcomm.com>, "Dmitry Baryshkov" <lumag@...nel.org>,
 "Abhinav Kumar" <abhinav.kumar@...ux.dev>, "Jessica Zhang"
 <jessica.zhang@....qualcomm.com>, "Sean Paul" <sean@...rly.run>, "Marijn
 Suijten" <marijn.suijten@...ainline.org>, "Sandy Huang"
 <hjc@...k-chips.com>, Heiko Stübner <heiko@...ech.de>,
 "Andy Yan" <andy.yan@...k-chips.com>, "Chen-Yu Tsai" <wens@...e.org>,
 "Samuel Holland" <samuel@...lland.org>
Cc: <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
 <linux-arm-msm@...r.kernel.org>, <freedreno@...ts.freedesktop.org>,
 <linux-arm-kernel@...ts.infradead.org>,
 <linux-rockchip@...ts.infradead.org>, <linux-sunxi@...ts.linux.dev>
Subject: Re: [PATCH 8/9] drm/rockchip: inno-hdmi: handle unsupported
 InfoFrames

On Sat Sep 27, 2025 at 3:04 AM CEST, Dmitry Baryshkov wrote:
> Make write_hdmi_infoframe() and clear_infoframe() callbacks
> return -EOPNOTSUPP for unsupported InfoFrames and make sure that
> atomic_check() callback doesn't allow unsupported InfoFrames to be
> enabled.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
> ---
>  drivers/gpu/drm/rockchip/inno_hdmi.c | 46 +++++++++++++++++++++++++++---------
>  1 file changed, 35 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/rockchip/inno_hdmi.c b/drivers/gpu/drm/rockchip/inno_hdmi.c
> index f24827dc1421cf5e0c1be63a80da23d645cf3f24..dc2d68b9c87f7ae7b06ecbeaebc82b9689c1abfd 100644
> --- a/drivers/gpu/drm/rockchip/inno_hdmi.c
> +++ b/drivers/gpu/drm/rockchip/inno_hdmi.c
> @@ -641,11 +641,8 @@ static int inno_hdmi_disable_frame(struct drm_connector *connector,
>  {
>  	struct inno_hdmi *hdmi = connector_to_inno_hdmi(connector);
>  
> -	if (type != HDMI_INFOFRAME_TYPE_AVI) {
> -		drm_err(connector->dev,
> -			"Unsupported infoframe type: %u\n", type);
> -		return 0;
> -	}
> +	if (type != HDMI_INFOFRAME_TYPE_AVI)
> +		return -EOPNOTSUPP;
>  
>  	hdmi_writeb(hdmi, HDMI_CONTROL_PACKET_BUF_INDEX, INFOFRAME_AVI);
>  
> @@ -659,11 +656,8 @@ static int inno_hdmi_upload_frame(struct drm_connector *connector,
>  	struct inno_hdmi *hdmi = connector_to_inno_hdmi(connector);
>  	ssize_t i;
>  
> -	if (type != HDMI_INFOFRAME_TYPE_AVI) {
> -		drm_err(connector->dev,
> -			"Unsupported infoframe type: %u\n", type);
> -		return 0;
> -	}
> +	if (type != HDMI_INFOFRAME_TYPE_AVI)
> +		return -EOPNOTSUPP;
>  
>  	inno_hdmi_disable_frame(connector, type);
>  
> @@ -673,6 +667,36 @@ static int inno_hdmi_upload_frame(struct drm_connector *connector,
>  	return 0;
>  }
>  
> +static int inno_hdmi_connector_atomic_check(struct drm_connector *connector,
> +					    struct drm_atomic_state *state)
> +{
> +	struct drm_connector_state *conn_state =
> +		drm_atomic_get_new_connector_state(state, connector);
> +	int ret;
> +
> +	ret = drm_atomic_helper_connector_hdmi_check(connector, state);
> +	if (ret)
> +		return ret;
> +
> +	/* not supported by the driver */
> +	conn_state->hdmi.infoframes.spd.set = false;
> +
> +	/* FIXME: not supported by the driver */
> +	conn_state->hdmi.infoframes.hdmi.set = false;
> +
> +	/* should not happen, HDR support not enabled */
> +	if (drm_WARN_ON_ONCE(connector->dev,
> +			     connector->hdmi.infoframes.audio.set))
> +		return -EOPNOTSUPP;
> +
> +	/* should not happen, audio support not enabled */
> +	if (drm_WARN_ON_ONCE(connector->dev,
> +			     conn_state->hdmi.infoframes.hdr_drm.set))
> +		return -EOPNOTSUPP;

Looks like the comments are on the wrong line? Also in patch 7.

Cheers,
  Diederik

> +
> +	return 0;
> +}
> +
>  static const struct drm_connector_hdmi_funcs inno_hdmi_hdmi_connector_funcs = {
>  	.clear_infoframe	= inno_hdmi_disable_frame,
>  	.write_infoframe	= inno_hdmi_upload_frame,
> @@ -1029,7 +1053,7 @@ static const struct drm_connector_funcs inno_hdmi_connector_funcs = {
>  };
>  
>  static struct drm_connector_helper_funcs inno_hdmi_connector_helper_funcs = {
> -	.atomic_check = drm_atomic_helper_connector_hdmi_check,
> +	.atomic_check = inno_hdmi_connector_atomic_check,
>  	.get_modes = inno_hdmi_connector_get_modes,
>  	.mode_valid = inno_hdmi_connector_mode_valid,
>  };


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