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drm/bridge: add function interface for DisplayPort audio implementation

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It is common for the DisplayPort bridges to implement audio support. In
preparation to providing a generic framework for DP audio, add
corresponding interface to struct drm_bridge. As suggested by Maxime
for now this is mostly c&p of the corresponding HDMI audio API.

Reviewed-by: Maxime Ripard <mripard@kernel.org>
Link: https://lore.kernel.org/r/20250314-dp-hdmi-audio-v6-2-dbd228fa73d7@oss.qualcomm.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
This commit is contained in:
Dmitry Baryshkov 2025-03-14 11:36:49 +02:00
parent 5d04b41889
commit d87ecc2327
1 changed files with 82 additions and 6 deletions
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88
include/drm/drm_bridge.h
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@ -737,6 +737,65 @@ struct drm_bridge_funcs {
struct drm_bridge *bridge,
bool enable, int direction);
/**
* @dp_audio_startup:
*
* Called when ASoC starts a DisplayPort audio stream setup.
*
* This callback is optional, it can be implemented by bridges that
* set the @DRM_BRIDGE_OP_DP_AUDIO flag in their &drm_bridge->ops.
*
* Returns:
* 0 on success, a negative error code otherwise
*/
int (*dp_audio_startup)(struct drm_connector *connector,
struct drm_bridge *bridge);
/**
* @dp_audio_prepare:
* Configures DisplayPort audio stream. Can be called multiple
* times for each setup.
*
* This callback is optional but it must be implemented by bridges that
* set the @DRM_BRIDGE_OP_DP_AUDIO flag in their &drm_bridge->ops.
*
* Returns:
* 0 on success, a negative error code otherwise
*/
int (*dp_audio_prepare)(struct drm_connector *connector,
struct drm_bridge *bridge,
struct hdmi_codec_daifmt *fmt,
struct hdmi_codec_params *hparms);
/**
* @dp_audio_shutdown:
*
* Shut down the DisplayPort audio stream.
*
* This callback is optional but it must be implemented by bridges that
* set the @DRM_BRIDGE_OP_DP_AUDIO flag in their &drm_bridge->ops.
*
* Returns:
* 0 on success, a negative error code otherwise
*/
void (*dp_audio_shutdown)(struct drm_connector *connector,
struct drm_bridge *bridge);
/**
* @dp_audio_mute_stream:
*
* Mute/unmute DisplayPort audio stream.
*
* This callback is optional, it can be implemented by bridges that
* set the @DRM_BRIDGE_OP_DP_AUDIO flag in their &drm_bridge->ops.
*
* Returns:
* 0 on success, a negative error code otherwise
*/
int (*dp_audio_mute_stream)(struct drm_connector *connector,
struct drm_bridge *bridge,
bool enable, int direction);
/**
* @debugfs_init:
*
@ -830,9 +889,24 @@ enum drm_bridge_ops {
*
* Note: currently there can be at most one bridge in a chain that sets
* this bit. This is to simplify corresponding glue code in connector
* drivers.
* drivers. Also it is not possible to have a bridge in the chain that
* sets @DRM_BRIDGE_OP_DP_AUDIO if there is a bridge that sets this
* flag.
*/
DRM_BRIDGE_OP_HDMI_AUDIO = BIT(5),
/**
* @DRM_BRIDGE_OP_DP_AUDIO: The bridge provides DisplayPort audio operations.
* Bridges that set this flag must implement the
* &drm_bridge_funcs->dp_audio_prepare and
* &drm_bridge_funcs->dp_audio_shutdown callbacks.
*
* Note: currently there can be at most one bridge in a chain that sets
* this bit. This is to simplify corresponding glue code in connector
* drivers. Also it is not possible to have a bridge in the chain that
* sets @DRM_BRIDGE_OP_HDMI_AUDIO if there is a bridge that sets this
* flag.
*/
DRM_BRIDGE_OP_DP_AUDIO = BIT(6),
};
/**
@ -946,25 +1020,27 @@ struct drm_bridge {
/**
* @hdmi_audio_dev: device to be used as a parent for the HDMI Codec if
* @DRM_BRIDGE_OP_HDMI_AUDIO is set.
* either of @DRM_BRIDGE_OP_HDMI_AUDIO or @DRM_BRIDGE_OP_DP_AUDIO is set.
*/
struct device *hdmi_audio_dev;
/**
* @hdmi_audio_max_i2s_playback_channels: maximum number of playback
* I2S channels for the bridge that sets @DRM_BRIDGE_OP_HDMI_AUDIO.
* I2S channels for the @DRM_BRIDGE_OP_HDMI_AUDIO or
* @DRM_BRIDGE_OP_DP_AUDIO.
*/
int hdmi_audio_max_i2s_playback_channels;
/**
* @hdmi_audio_spdif_playback: set if this bridge has S/PDIF playback
* port for @DRM_BRIDGE_OP_HDMI_AUDIO
* port for @DRM_BRIDGE_OP_HDMI_AUDIO or @DRM_BRIDGE_OP_DP_AUDIO.
*/
unsigned int hdmi_audio_spdif_playback : 1;
/**
* @hdmi_audio_dai_port: sound DAI port for @DRM_BRIDGE_OP_HDMI_AUDIO,
* -1 if it is not used.
* @hdmi_audio_dai_port: sound DAI port for either of
* @DRM_BRIDGE_OP_HDMI_AUDIO and @DRM_BRIDGE_OP_DP_AUDIO, -1 if it is
* not used.
*/
int hdmi_audio_dai_port;
};