[PATCH v7 04/10] drm/bridge: connector: add support for HDMI codec framework

Dmitry Baryshkov
2024-12-17T00:45:04Z

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.

Reviewed-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
drivers/gpu/drm/display/drm_bridge_connector.c | 98 ++++++++++++++++++++++++--
include/drm/drm_bridge.h | 38 ++++++++++
2 files changed, 132 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..be46d2e7cb5cec262ca5dd6f42f8f31b0187a0f7 100644
--- a/drivers/gpu/drm/display/drm_bridge_connector.c
+++ b/drivers/gpu/drm/display/drm_bridge_connector.c
@@ -374,6 +374,75 @@ static const struct drm_connector_hdmi_funcs drm_bridge_connector_hdmi_funcs = {
.write_infoframe = drm_bridge_connector_write_infoframe,
};

+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 0;
+
+ return bridge->funcs->hdmi_codec_audio_startup(connector, bridge);
+}
+
+static int drm_bridge_connector_prepare(struct drm_connector *connector,
+ struct hdmi_codec_daifmt *fmt,
+ struct hdmi_codec_params *hparms)
+{
+ struct drm_bridge_connector *bridge_connector =
+ to_drm_bridge_connector(connector);
+ struct drm_bridge *bridge;
+
+ bridge = bridge_connector->bridge_hdmi;
+ if (!bridge)
+ return -EINVAL;
+
+ return bridge->funcs->hdmi_codec_prepare(connector, bridge, fmt, hparms);
+}
+
+static void drm_bridge_connector_audio_shutdown(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;
+
+ bridge->funcs->hdmi_codec_audio_shutdown(connector, bridge);
+}
+
+static int drm_bridge_connector_mute_stream(struct drm_connector *connector,
+ bool enable, int direction)
+{
+ 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_mute_stream)
+ return bridge->funcs->hdmi_codec_mute_stream(connector, bridge,
+ enable, direction);
+ else
+ return -ENOTSUPP;
+}
+
+static const struct drm_connector_hdmi_codec_funcs drm_bridge_connector_hdmi_codec_funcs = {
+ .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,
+};
+
/* -----------------------------------------------------------------------------
* Bridge Connector Initialisation
*/
@@ -473,7 +542,9 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
if (connector_type == DRM_MODE_CONNECTOR_Unknown)
return ERR_PTR(-EINVAL);

- if (bridge_connector->bridge_hdmi)
+ if (bridge_connector->bridge_hdmi) {
+ bridge = bridge_connector->bridge_hdmi;
+
ret = drmm_connector_hdmi_init(drm, connector,
bridge_connector->bridge_hdmi->vendor,
bridge_connector->bridge_hdmi->product,
@@ -482,12 +553,31 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
connector_type, ddc,
supported_formats,
max_bpc);
- else
+ if (ret)
+ return ERR_PTR(ret);
+
+ if (bridge->hdmi_codec_max_i2s_playback_channels ||
+ bridge->hdmi_codec_spdif_playback) {
+ if (!bridge->funcs->hdmi_codec_prepare ||
+ !bridge->funcs->hdmi_codec_audio_shutdown)
+ return ERR_PTR(-EINVAL);
+
+ ret = drm_connector_hdmi_audio_init(connector,
+ bridge->hdmi_codec_dev,
+ &drm_bridge_connector_hdmi_codec_funcs,
+ bridge->hdmi_codec_max_i2s_playback_channels,
+ bridge->hdmi_codec_spdif_playback,
+ bridge->hdmi_codec_dai_port);
+ if (ret)
+ return ERR_PTR(ret);
+ }
+ } else {
ret = drmm_connector_init(drm, connector,
&drm_bridge_connector_funcs,
connector_type, ddc);
- if (ret)
- return ERR_PTR(ret);
+ if (ret)
+ return ERR_PTR(ret);
+ }

drm_connector_helper_add(connector, &drm_bridge_connector_helper_funcs);

diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index e8d735b7f6a480468c88287e2517b387ceec0f22..fd7ad7315a8bfda90f02b0704c33ba0e356899fb 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 +678,21 @@ struct drm_bridge_funcs {
enum hdmi_infoframe_type type,
const u8 *buffer, size_t len);

+ int (*hdmi_codec_audio_startup)(struct drm_connector *connector,
+ struct drm_bridge *bridge);
+
+ int (*hdmi_codec_prepare)(struct drm_connector *connector,
+ struct drm_bridge *bridge,
+ struct hdmi_codec_daifmt *fmt,
+ struct hdmi_codec_params *hparms);
+
+ void (*hdmi_codec_audio_shutdown)(struct drm_connector *connector,
+ struct drm_bridge *bridge);
+
+ int (*hdmi_codec_mute_stream)(struct drm_connector *connector,
+ struct drm_bridge *bridge,
+ bool enable, int direction);
+
/**
* @debugfs_init:
*
@@ -859,6 +876,27 @@ struct drm_bridge {
* @DRM_BRIDGE_OP_HDMI is set.
*/
unsigned int max_bpc;
+
+ /**
+ * @hdmi_codec_dev: device to be used as a parent for the HDMI Codec
+ */
+ struct device *hdmi_codec_dev;
+
+ /**
+ * @hdmi_codec_max_i2s_playback_channels: maximum number of playback
+ * I2S channels for the HDMI codec
+ */
+ int hdmi_codec_max_i2s_playback_channels;
+
+ /**
+ * @hdmi_codec_spdif_playback: set if HDMI codec has S/PDIF playback port
+ */
+ unsigned int hdmi_codec_spdif_playback : 1;
+
+ /**
+ * @hdmi_codec_dai_port: sound DAI port, -1 if it is not enabled
+ */
+ int hdmi_codec_dai_port;
};

static inline struct drm_bridge *

--
2.39.5