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.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>
---
include/drm/drm_bridge.h | 88 ++++++++++++++++++++++++++++++++++++++++++++----
1 file changed, 82 insertions(+), 6 deletions(-)
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index c6b66f733fffa77afc875e52f9d1500fcb66400f..e8d0e56bcc91c1f4c689e4e6fbd2aceaf4fc5cf1 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -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),
};
/**
@@ -934,25 +1008,27 @@ 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;
};
--
2.39.5
