Hi Dmitry,
Thank you for the patch.
On Sun, Feb 09, 2025 at 03:41:18PM +0200, Dmitry Baryshkov wrote:
> 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.barysh...@linaro.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),
The OP bits are not supposed to describe tbe type of bridge, but the
operations it implements. I see quite a bit of duplication between HDMI
and DisplayPort in this patch. Can we have a single bit named after the
feature that you want to support ? The bridge_hdmi and bridge_dp fields
should also be merged into a single one.
> };
>
> /**
>
--
Regards,
Laurent Pinchart
