linux-kernel - [PATCH v4 1/9] drm/connector: hdmi: accept NULL for Audio Infoframe

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Message-Id: <20240531-bridge-hdmi-connector-v4-1-5110f7943622@linaro.org>
Date: Fri, 31 May 2024 23:07:24 +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 v4 1/9] drm/connector: hdmi: accept NULL for Audio
 Infoframe

Allow passing NULL as audio infoframe as a way to disable Audio
Infoframe generation.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 drivers/gpu/drm/display/drm_hdmi_state_helper.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
index ce96837eea65..5356723d21f5 100644
--- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c
+++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
@@ -681,7 +681,7 @@ EXPORT_SYMBOL(drm_atomic_helper_connector_hdmi_update_infoframes);
 /**
  * drm_atomic_helper_connector_hdmi_update_audio_infoframe - Update the Audio Infoframe
  * @connector: A pointer to the HDMI connector
- * @frame: A pointer to the audio infoframe to write
+ * @frame: A pointer to the audio infoframe to write or NULL to disable sending the frame
  *
  * This function is meant for HDMI connector drivers to update their
  * audio infoframe. It will typically be used in one of the ALSA hooks
@@ -704,10 +704,16 @@ drm_atomic_helper_connector_hdmi_update_audio_infoframe(struct drm_connector *co
 
 	mutex_lock(&connector->hdmi.infoframes.lock);
 
-	memcpy(&infoframe->data, frame, sizeof(infoframe->data));
-	infoframe->set = true;
+	if (frame) {
+		memcpy(&infoframe->data, frame, sizeof(infoframe->data));
+		infoframe->set = true;
+
+		ret = write_infoframe(connector, infoframe);
+	} else {
+		infoframe->set = false;
 
-	ret = write_infoframe(connector, infoframe);
+		ret = clear_infoframe(connector, infoframe);
+	}
 
 	mutex_unlock(&connector->hdmi.infoframes.lock);
 

-- 
2.39.2