[PATCH RFC 4/5] drm/bridge: connector: add support for HDMI codec framework
Dmitry Baryshkov
dmitry.baryshkov at linaro.org
Sat Jun 15 17:53:33 UTC 2024
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 at linaro.org>
---
drivers/gpu/drm/drm_bridge_connector.c | 130 ++++++++++++++++++++++++++++++++-
include/drm/drm_bridge.h | 46 ++++++++++++
2 files changed, 174 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_bridge_connector.c b/drivers/gpu/drm/drm_bridge_connector.c
index 0869b663f17e..71d6fdc2391f 100644
--- a/drivers/gpu/drm/drm_bridge_connector.c
+++ b/drivers/gpu/drm/drm_bridge_connector.c
@@ -20,6 +20,8 @@
#include <drm/drm_probe_helper.h>
#include <drm/display/drm_hdmi_state_helper.h>
+#include <sound/hdmi-codec.h>
+
/**
* DOC: overview
*
@@ -95,6 +97,14 @@ struct drm_bridge_connector {
* HDMI connector infrastructure, if any (see &DRM_BRIDGE_OP_HDMI).
*/
struct drm_bridge *bridge_hdmi;
+ /**
+ * @bridge_hdmi_codec:
+ *
+ * The bridge in the chain that implements necessary support for the
+ * HDMI Audio Codec infrastructure, if any (see
+ * &DRM_BRIDGE_OP_HDMI_CODEC).
+ */
+ struct drm_bridge *bridge_hdmi_codec;
};
#define to_drm_bridge_connector(x) \
@@ -343,10 +353,104 @@ 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 device *dev, void *data)
+{
+ struct drm_connector *connector = data;
+ struct drm_bridge_connector *bridge_connector =
+ to_drm_bridge_connector(connector);
+ struct drm_bridge *bridge;
+
+ bridge = bridge_connector->bridge_hdmi_codec;
+ if (!bridge)
+ return -EINVAL;
+
+ if (bridge->funcs->hdmi_codec_audio_startup)
+ return bridge->funcs->hdmi_codec_audio_startup(dev, connector, bridge);
+ else
+ return 0;
+}
+
+static int drm_bridge_connector_prepare(struct device *dev, void *data,
+ struct hdmi_codec_daifmt *fmt,
+ struct hdmi_codec_params *hparms)
+{
+ struct drm_connector *connector = data;
+ struct drm_bridge_connector *bridge_connector =
+ to_drm_bridge_connector(connector);
+ struct drm_bridge *bridge;
+
+ bridge = bridge_connector->bridge_hdmi_codec;
+ if (!bridge)
+ return -EINVAL;
+
+ return bridge->funcs->hdmi_codec_prepare(dev, connector, bridge, fmt, hparms);
+}
+
+static void drm_bridge_connector_audio_shutdown(struct device *dev, void *data)
+{
+ struct drm_connector *connector = data;
+ struct drm_bridge_connector *bridge_connector =
+ to_drm_bridge_connector(connector);
+ struct drm_bridge *bridge;
+
+ bridge = bridge_connector->bridge_hdmi_codec;
+ if (!bridge)
+ return;
+
+ bridge->funcs->hdmi_codec_audio_shutdown(dev, connector, bridge);
+}
+
+static int drm_bridge_connector_mute_stream(struct device *dev, void *data,
+ bool enable, int direction)
+{
+ struct drm_connector *connector = data;
+ struct drm_bridge_connector *bridge_connector =
+ to_drm_bridge_connector(connector);
+ struct drm_bridge *bridge;
+
+ bridge = bridge_connector->bridge_hdmi_codec;
+ if (!bridge)
+ return -EINVAL;
+
+ if (bridge->funcs->hdmi_codec_mute_stream)
+ return bridge->funcs->hdmi_codec_mute_stream(dev, connector, bridge,
+ enable, direction);
+ else
+ return -ENOTSUPP;
+}
+
+static int drm_bridge_connector_get_dai_id(struct snd_soc_component *comment,
+ struct device_node *endpoint,
+ void *data)
+{
+ struct drm_connector *connector = data;
+ struct drm_bridge_connector *bridge_connector =
+ to_drm_bridge_connector(connector);
+ struct drm_bridge *bridge;
+
+ bridge = bridge_connector->bridge_hdmi_codec;
+ if (!bridge)
+ return -EINVAL;
+
+ if (bridge->funcs->hdmi_codec_get_dai_id)
+ return bridge->funcs->hdmi_codec_get_dai_id(connector, bridge, endpoint);
+ else
+ return -ENOTSUPP;
+}
+
+static const struct hdmi_codec_ops drm_bridge_connector_hdmi_codec_ops = {
+ .audio_startup = drm_bridge_connector_audio_startup,
+ .prepare = drm_bridge_connector_prepare,
+ .audio_shutdown = drm_bridge_connector_audio_shutdown,
+ .mute_stream = drm_bridge_connector_mute_stream,
+ .get_dai_id = drm_bridge_connector_get_dai_id,
+};
+
static const struct drm_connector_hdmi_funcs drm_bridge_connector_hdmi_funcs = {
.tmds_char_rate_valid = drm_bridge_connector_tmds_char_rate_valid,
.clear_infoframe = drm_bridge_connector_clear_infoframe,
.write_infoframe = drm_bridge_connector_write_infoframe,
+ .codec_ops = &drm_bridge_connector_hdmi_codec_ops,
};
/* -----------------------------------------------------------------------------
@@ -427,6 +531,23 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
max_bpc = bridge->max_bpc;
}
+ if (bridge->ops & DRM_BRIDGE_OP_HDMI_CODEC) {
+ if (bridge_connector->bridge_hdmi_codec)
+ return ERR_PTR(-EBUSY);
+ if (!bridge->funcs->hdmi_codec_prepare ||
+ !bridge->funcs->hdmi_codec_audio_shutdown)
+ return ERR_PTR(-EINVAL);
+
+ bridge_connector->bridge_hdmi_codec = bridge;
+
+ connector->hdmi_codec.parent_dev = bridge->parent;
+ connector->hdmi_codec.i2s = bridge->hdmi_codec_i2s;
+ connector->hdmi_codec.spdif = bridge->hdmi_codec_spdif;
+ connector->hdmi_codec.max_i2s_channels = bridge->max_i2s_channels;
+
+ bridge->hdmi_codec = &connector->hdmi_codec;
+ }
+
if (!drm_bridge_get_next_bridge(bridge))
connector_type = bridge->type;
@@ -448,7 +569,7 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
return ERR_PTR(-EINVAL);
}
- if (bridge_connector->bridge_hdmi)
+ if (bridge_connector->bridge_hdmi) {
ret = drmm_connector_hdmi_init(drm, connector,
bridge_connector->bridge_hdmi->vendor,
bridge_connector->bridge_hdmi->product,
@@ -457,10 +578,15 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
connector_type, ddc,
supported_formats,
max_bpc);
- else
+ } else {
ret = drmm_connector_init(drm, connector,
&drm_bridge_connector_funcs,
connector_type, ddc);
+ if (!ret && bridge_connector->bridge_hdmi_codec) {
+ ret = drmm_connector_hdmi_codec_alloc(drm, connector,
+ &drm_bridge_connector_hdmi_codec_ops);
+ }
+ }
if (ret) {
kfree(bridge_connector);
return ERR_PTR(ret);
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 75019d16be64..c4a95c489b00 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -41,6 +41,8 @@ struct drm_display_info;
struct drm_minor;
struct drm_panel;
struct edid;
+struct hdmi_codec_daifmt;
+struct hdmi_codec_params;
struct i2c_adapter;
/**
@@ -676,6 +678,29 @@ struct drm_bridge_funcs {
enum hdmi_infoframe_type type,
const u8 *buffer, size_t len);
+ int (*hdmi_codec_audio_startup)(struct device *dev,
+ struct drm_connector *connector,
+ struct drm_bridge *bridge);
+
+ int (*hdmi_codec_prepare)(struct device *dev,
+ struct drm_connector *connector,
+ struct drm_bridge *bridge,
+ struct hdmi_codec_daifmt *fmt,
+ struct hdmi_codec_params *hparms);
+
+ void (*hdmi_codec_audio_shutdown)(struct device *dev,
+ struct drm_connector *connector,
+ struct drm_bridge *bridge);
+
+ int (*hdmi_codec_mute_stream)(struct device *dev,
+ struct drm_connector *connector,
+ struct drm_bridge *bridge,
+ bool enable, int direction);
+
+ int (*hdmi_codec_get_dai_id)(struct drm_connector *connector,
+ struct drm_bridge *bridge,
+ struct device_node *endpoint);
+
/**
* @debugfs_init:
*
@@ -761,6 +786,20 @@ enum drm_bridge_ops {
* drivers.
*/
DRM_BRIDGE_OP_HDMI = BIT(4),
+ /**
+ * @DRM_BRIDGE_OP_HDMI_CODEC: The bridge provides HDMI Audio Codec
+ * operations. Bridges that set this flag must implement the
+ * &drm_bridge_funcs->hdmi_codec_prepare and
+ * &drm_bridge_funcs->hdmi_codec_audio_shutdown callbacks and set the
+ * relevant field in the &drm_bridge structure.
+ *
+ * This framework can be used by both HDMI and DisplayPort bridges.
+ *
+ * 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.
+ */
+ DRM_BRIDGE_OP_HDMI_CODEC = BIT(5),
};
/**
@@ -771,6 +810,8 @@ struct drm_bridge {
struct drm_private_obj base;
/** @dev: DRM device this bridge belongs to */
struct drm_device *dev;
+ /** @parent: device corresponding to the bridge, required only for HDMI codec */
+ struct device *parent;
/** @encoder: encoder to which this bridge is connected */
struct drm_encoder *encoder;
/** @chain_node: used to form a bridge chain */
@@ -854,6 +895,11 @@ struct drm_bridge {
* @DRM_BRIDGE_OP_HDMI is set.
*/
unsigned int max_bpc;
+
+ int max_i2s_channels;
+ unsigned int hdmi_codec_i2s : 1;
+ unsigned int hdmi_codec_spdif : 1;
+ struct drm_connector_hdmi_codec *hdmi_codec;
};
static inline struct drm_bridge *
--
2.39.2
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