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[2001:14ba:a0c3:3a00:264b:feff:fe8b:be8a]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-549ba7a8368sm478585e87.32.2025.03.14.02.36.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 14 Mar 2025 02:36:59 -0700 (PDT) From: Dmitry Baryshkov Date: Fri, 14 Mar 2025 11:36:49 +0200 Subject: [PATCH v6 2/4] drm/bridge: add function interface for DisplayPort audio implementation Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20250314-dp-hdmi-audio-v6-2-dbd228fa73d7@oss.qualcomm.com> References: <20250314-dp-hdmi-audio-v6-0-dbd228fa73d7@oss.qualcomm.com> In-Reply-To: <20250314-dp-hdmi-audio-v6-0-dbd228fa73d7@oss.qualcomm.com> To: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Clark , Abhinav Kumar , Sean Paul , Marijn Suijten , Hermes Wu , Dmitry Baryshkov Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=4882; i=dmitry.baryshkov@oss.qualcomm.com; h=from:subject:message-id; bh=sPGFPs8Z9BJzKH3T0QhgjGfhe3qB0nROPdLNLb450jk=; b=owEBbQGS/pANAwAKAYs8ij4CKSjVAcsmYgBn0/ixcF0KVuK5O3qMfR6zk8CJZvUE1rfBf7MgP pa+lkcaIDiJATMEAAEKAB0WIQRMcISVXLJjVvC4lX+LPIo+Aiko1QUCZ9P4sQAKCRCLPIo+Aiko 1VicCACT3fkLWM99BgjcdDqMoVZ2qL5iU7A4kGDlUS1EZSsdCxqcqblOHmzmqUNwzLd9RdUp/3h lo59QNm+mnNht9pNC4D67dPwm/pcRPGYQhoaiT4BuXb3LYm6GcJ+hF2Zu/IopztZUn0PIVq6bDL wwBV4yjwOsyWjXW2eeQYBuZSckBS9VxsI8WWvo4IVE987p+00C1Rzrb5mPG/WeuXtRd+axXAt7e 0itOGCNXFS96Q+xXEE+7KGP+zt1swUhg9f+oj8xDv+W9MoBrtjY1vXU4ecwMxWj+ln3mUrfwwNM 50DU1B51imC85WLt7ZfFfpHR/Wg01cv58amOmkvZGODGisPp X-Developer-Key: i=dmitry.baryshkov@oss.qualcomm.com; a=openpgp; fpr=8F88381DD5C873E4AE487DA5199BF1243632046A X-Authority-Analysis: v=2.4 cv=PtWTbxM3 c=1 sm=1 tr=0 ts=67d3f8bf cx=c_pps a=wEM5vcRIz55oU/E2lInRtA==:117 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=Vs1iUdzkB0EA:10 a=EUspDBNiAAAA:8 a=4Yht-t6EeviOxvws5vEA:9 a=QEXdDO2ut3YA:10 a=OIgjcC2v60KrkQgK7BGD:22 X-Proofpoint-GUID: CF1U-CFNaUTiCVYkE_78KFMxG2pCz6Rb X-Proofpoint-ORIG-GUID: CF1U-CFNaUTiCVYkE_78KFMxG2pCz6Rb X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1093,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-03-14_04,2025-03-13_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 lowpriorityscore=0 mlxscore=0 mlxlogscore=999 impostorscore=0 spamscore=0 adultscore=0 phishscore=0 bulkscore=0 clxscore=1015 malwarescore=0 suspectscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2502280000 definitions=main-2503140075 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 --- 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; };