linux-kernel - [PATCH v5 1/9] drm/connector: hdmi: allow disabling Audio Infoframe

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Message-Id: <20240607-bridge-hdmi-connector-v5-1-ab384e6021af@linaro.org>
Date: Fri, 07 Jun 2024 16:22:58 +0300
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>, Daniel Vetter <daniel@...ll.ch>, 
 Rob Clark <robdclark@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>, 
 Sean Paul <sean@...rly.run>, Marijn Suijten <marijn.suijten@...ainline.org>
Cc: dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org, 
 freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: [PATCH v5 1/9] drm/connector: hdmi: allow disabling Audio
 Infoframe

Add drm_atomic_helper_connector_hdmi_disable_audio_infoframe(), an API
to allow the driver disable sending the Audio Infoframe. This is to be
used by the drivers if setup of the infoframes is not tightly coupled
with the audio functionality and just disabling the audio playback
doesn't stop the HDMI hardware from sending the Infoframe.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 drivers/gpu/drm/display/drm_hdmi_state_helper.c | 36 +++++++++++++++++++++++++
 include/drm/display/drm_hdmi_state_helper.h     |  1 +
 2 files changed, 37 insertions(+)

diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
index ce96837eea65..731873b3bdf2 100644
--- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c
+++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
@@ -714,3 +714,39 @@ drm_atomic_helper_connector_hdmi_update_audio_infoframe(struct drm_connector *co
 	return ret;
 }
 EXPORT_SYMBOL(drm_atomic_helper_connector_hdmi_update_audio_infoframe);
+
+/**
+ * drm_atomic_helper_connector_hdmi_disable_audio_infoframe - Stop sending the Audio Infoframe
+ * @connector: A pointer to the HDMI connector
+ *
+ * This function is meant for HDMI connector drivers to stop sending their
+ * audio infoframe. It will typically be used in one of the ALSA hooks
+ * (most likely shutdown).
+ *
+ * Returns:
+ * Zero on success, error code on failure.
+ */
+int
+drm_atomic_helper_connector_hdmi_disable_audio_infoframe(struct drm_connector *connector)
+{
+	struct drm_connector_hdmi_infoframe *infoframe =
+		&connector->hdmi.infoframes.audio;
+	struct drm_display_info *info = &connector->display_info;
+	int ret;
+
+	if (!info->is_hdmi)
+		return 0;
+
+	mutex_lock(&connector->hdmi.infoframes.lock);
+
+	infoframe->set = false;
+
+	ret = clear_infoframe(connector, infoframe);
+
+	memset(&infoframe->data, 0, sizeof(infoframe->data));
+
+	mutex_unlock(&connector->hdmi.infoframes.lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(drm_atomic_helper_connector_hdmi_disable_audio_infoframe);
diff --git a/include/drm/display/drm_hdmi_state_helper.h b/include/drm/display/drm_hdmi_state_helper.h
index fbf86ff9cdfb..c3d23725f0b8 100644
--- a/include/drm/display/drm_hdmi_state_helper.h
+++ b/include/drm/display/drm_hdmi_state_helper.h
@@ -16,6 +16,7 @@ int drm_atomic_helper_connector_hdmi_check(struct drm_connector *connector,
 
 int drm_atomic_helper_connector_hdmi_update_audio_infoframe(struct drm_connector *connector,
 							    struct hdmi_audio_infoframe *frame);
+int drm_atomic_helper_connector_hdmi_disable_audio_infoframe(struct drm_connector *connector);
 int drm_atomic_helper_connector_hdmi_update_infoframes(struct drm_connector *connector,
 						       struct drm_atomic_state *state);
 

-- 
2.39.2