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Message-Id: <20250206-dp-hdmi-audio-v1-1-8aa14a8c0d4d@linaro.org>
Date: Thu, 06 Feb 2025 15:51:06 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: 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>,
Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
Rob Clark <robdclark@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>,
Sean Paul <sean@...rly.run>, Marijn Suijten <marijn.suijten@...ainline.org>,
Hermes Wu <Hermes.wu@....com.tw>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org
Subject: [PATCH 1/2] drm/display: bridge-connector: add DisplayPort bridges
DRM HDMI Codec framework is useful not only for the HDMI bridges, but
also for the DisplayPort bridges. Add new DRM_BRIDGE_OP_DisplayPort
define in order to distinguish DP bridges. Create HDMI codec device
automatically for DP bridges which have declared audio support.
Note, unlike HDMI devices, which already have a framework to handle HPD
notifications in a standard way, DP drivers don't (yet?) have such a
framework. As such it is necessary to manually call
drm_connector_hdmi_audio_plugged_notify(). This requirement hopefully
can be lifted later on, if/when DRM framework gets better DisplayPort
ports support in the core layer.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
drivers/gpu/drm/display/drm_bridge_connector.c | 66 ++++++++++++++++++++------
include/drm/drm_bridge.h | 14 +++++-
2 files changed, 65 insertions(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/display/drm_bridge_connector.c b/drivers/gpu/drm/display/drm_bridge_connector.c
index 30c736fc0067e31a97db242e5b16ea8a5b4cf359..5e031395b801f9a1371dcb4ac09f3da23e4615dd 100644
--- a/drivers/gpu/drm/display/drm_bridge_connector.c
+++ b/drivers/gpu/drm/display/drm_bridge_connector.c
@@ -98,6 +98,13 @@ struct drm_bridge_connector {
* HDMI connector infrastructure, if any (see &DRM_BRIDGE_OP_HDMI).
*/
struct drm_bridge *bridge_hdmi;
+ /**
+ * @bridge_dp:
+ *
+ * The bridge in the chain that implements necessary support for the
+ * DisplayPort connector infrastructure, if any (see &DRM_BRIDGE_OP_DisplayPort).
+ */
+ struct drm_bridge *bridge_dp;
};
#define to_drm_bridge_connector(x) \
@@ -496,6 +503,25 @@ static const struct drm_connector_hdmi_audio_funcs drm_bridge_connector_hdmi_aud
.mute_stream = drm_bridge_connector_audio_mute_stream,
};
+static int drm_bridge_connector_hdmi_audio_init(struct drm_connector *connector,
+ struct drm_bridge *bridge)
+{
+ if (!bridge->hdmi_audio_max_i2s_playback_channels &&
+ !bridge->hdmi_audio_spdif_playback)
+ return 0;
+
+ if (!bridge->funcs->hdmi_audio_prepare ||
+ !bridge->funcs->hdmi_audio_shutdown)
+ return -EINVAL;
+
+ return drm_connector_hdmi_audio_init(connector,
+ bridge->hdmi_audio_dev,
+ &drm_bridge_connector_hdmi_audio_funcs,
+ bridge->hdmi_audio_max_i2s_playback_channels,
+ bridge->hdmi_audio_spdif_playback,
+ bridge->hdmi_audio_dai_port);
+}
+
/* -----------------------------------------------------------------------------
* Bridge Connector Initialisation
*/
@@ -564,6 +590,8 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
if (bridge->ops & DRM_BRIDGE_OP_HDMI) {
if (bridge_connector->bridge_hdmi)
return ERR_PTR(-EBUSY);
+ if (bridge_connector->bridge_dp)
+ return ERR_PTR(-EINVAL);
if (!bridge->funcs->hdmi_write_infoframe ||
!bridge->funcs->hdmi_clear_infoframe)
return ERR_PTR(-EINVAL);
@@ -576,6 +604,16 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
max_bpc = bridge->max_bpc;
}
+ if (bridge->ops & DRM_BRIDGE_OP_DisplayPort) {
+ if (bridge_connector->bridge_dp)
+ return ERR_PTR(-EBUSY);
+ if (bridge_connector->bridge_hdmi)
+ return ERR_PTR(-EINVAL);
+
+ bridge_connector->bridge_dp = bridge;
+
+ }
+
if (!drm_bridge_get_next_bridge(bridge))
connector_type = bridge->type;
@@ -612,21 +650,21 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
if (ret)
return ERR_PTR(ret);
- if (bridge->hdmi_audio_max_i2s_playback_channels ||
- bridge->hdmi_audio_spdif_playback) {
- if (!bridge->funcs->hdmi_audio_prepare ||
- !bridge->funcs->hdmi_audio_shutdown)
- return ERR_PTR(-EINVAL);
+ ret = drm_bridge_connector_hdmi_audio_init(connector, bridge);
+ if (ret)
+ return ERR_PTR(ret);
+ } else if (bridge_connector->bridge_dp) {
+ bridge = bridge_connector->bridge_dp;
- ret = drm_connector_hdmi_audio_init(connector,
- bridge->hdmi_audio_dev,
- &drm_bridge_connector_hdmi_audio_funcs,
- bridge->hdmi_audio_max_i2s_playback_channels,
- bridge->hdmi_audio_spdif_playback,
- bridge->hdmi_audio_dai_port);
- if (ret)
- return ERR_PTR(ret);
- }
+ ret = drmm_connector_init(drm, connector,
+ &drm_bridge_connector_funcs,
+ connector_type, ddc);
+ if (ret)
+ return ERR_PTR(ret);
+
+ ret = drm_bridge_connector_hdmi_audio_init(connector, bridge);
+ if (ret)
+ return ERR_PTR(ret);
} else {
ret = drmm_connector_init(drm, connector,
&drm_bridge_connector_funcs,
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 496dbbd2ad7edff7f091adfbe62de1e33ef0cf07..40f37444426b1b8ded25da9ba9e2963f18ad6267 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -811,9 +811,21 @@ 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. Having both HDMI and DisplayPort bridges in the same bridge
+ * chain is also not allowed.
*/
DRM_BRIDGE_OP_HDMI = BIT(4),
+ /**
+ * @DRM_BRIDGE_OP_DisplayPort: The bridge provides DisplayPort connector
+ * operations. Currently this is limited to the optional HDMI codec
+ * support.
+ *
+ * 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. Having both HDMI and DisplayPort bridges in the same bridge
+ * chain is also not allowed.
+ */
+ DRM_BRIDGE_OP_DisplayPort = BIT(5),
};
/**
--
2.39.5
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