linux-kernel - Re: [PATCH v6 04/10] drm/bridge: connector: add support for HDMI codec framework

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Message-ID: <20241216-benign-amiable-grebe-e0b3e1@houat>
Date: Mon, 16 Dec 2024 18:14:43 +0100
From: Maxime Ripard <mripard@...nel.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: 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>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
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	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, linux-sound@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org, 
	linux-mediatek@...ts.infradead.org, linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH v6 04/10] drm/bridge: connector: add support for HDMI
 codec framework

On Fri, Dec 06, 2024 at 12:15:58PM +0200, Dmitry Baryshkov wrote:
> Add necessary glue code to be able to use new HDMI codec framework from
> the DRM bridge drivers. The drm_bridge implements a limited set of the
> hdmi_codec_ops interface, with the functions accepting both
> drm_connector and drm_bridge instead of just a generic void pointer.
> 
> This framework is integrated with the DRM HDMI Connector framework, but
> can also be used for DisplayPort connectors.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
>  drivers/gpu/drm/display/drm_bridge_connector.c | 100 ++++++++++++++++++++++++-
>  include/drm/drm_bridge.h                       |  38 ++++++++++
>  2 files changed, 134 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/display/drm_bridge_connector.c b/drivers/gpu/drm/display/drm_bridge_connector.c
> index 512ced87ea18c74e182a558a686ddd83de891814..4fa1bb73d430d02d5b79a1a184c203ec9e9c66e7 100644
> --- a/drivers/gpu/drm/display/drm_bridge_connector.c
> +++ b/drivers/gpu/drm/display/drm_bridge_connector.c
> @@ -21,6 +21,8 @@
>  #include <drm/display/drm_hdmi_helper.h>
>  #include <drm/display/drm_hdmi_state_helper.h>
>  
> +#include <sound/hdmi-codec.h>
> +
>  /**
>   * DOC: overview
>   *
> @@ -368,10 +370,80 @@ static int drm_bridge_connector_write_infoframe(struct drm_connector *connector,
>  	return bridge->funcs->hdmi_write_infoframe(bridge, type, buffer, len);
>  }
>  
> +static int drm_bridge_connector_audio_startup(struct drm_connector *connector)
> +{
> +	struct drm_bridge_connector *bridge_connector =
> +		to_drm_bridge_connector(connector);
> +	struct drm_bridge *bridge;
> +
> +	bridge = bridge_connector->bridge_hdmi;
> +	if (!bridge)
> +		return -EINVAL;
> +
> +	if (bridge->funcs->hdmi_codec_audio_startup)
> +		return bridge->funcs->hdmi_codec_audio_startup(connector, bridge);
> +	else
> +		return 0;
> +}

Nit: it looks like you return in other cases, and there's no need for
that else.

I'd remove the else.

Looks good otherwise, once fixed
Reviewed-by: Maxime Ripard <mripard@...nel.org>

Maxime

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