Instead of writing the first byte of the infoframe (and hoping that the
rest is default / zeroes), hook Audio InfoFrame support into the
write_infoframe / clear_infoframes callbacks and use
drm_atomic_helper_connector_hdmi_update_audio_infoframe() to write the
frame.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/bridge/adv7511/adv7511_audio.c | 23 ++++++-----------------
 drivers/gpu/drm/bridge/adv7511/adv7511_drv.c   | 18 ++++++++++++++++++
 2 files changed, 24 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_audio.c b/drivers/gpu/drm/bridge/adv7511/adv7511_audio.c
index 766b1c96bc887d228492cd7ab0d61094590fa876..87e7e820810a886af8e899410c51e729200f3222 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7511_audio.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7511_audio.c
@@ -12,6 +12,8 @@
 #include <sound/soc.h>
 #include <linux/of_graph.h>
 
+#include <drm/display/drm_hdmi_state_helper.h>
+
 #include "adv7511.h"
 
 static void adv7511_calc_cts_n(unsigned int f_tmds, unsigned int fs,
@@ -155,17 +157,8 @@ int adv7511_hdmi_audio_prepare(struct drm_bridge *bridge,
 	regmap_update_bits(adv7511->regmap, ADV7511_REG_I2C_FREQ_ID_CFG,
 			   ADV7511_I2C_FREQ_ID_CFG_RATE_MASK, rate << 4);
 
-	/* send current Audio infoframe values while updating */
-	regmap_update_bits(adv7511->regmap, ADV7511_REG_INFOFRAME_UPDATE,
-			   BIT(5), BIT(5));
-
-	regmap_write(adv7511->regmap, ADV7511_REG_AUDIO_INFOFRAME(0), 0x1);
-
-	/* use Audio infoframe updated info */
-	regmap_update_bits(adv7511->regmap, ADV7511_REG_INFOFRAME_UPDATE,
-			   BIT(5), 0);
-
-	return 0;
+	return drm_atomic_helper_connector_hdmi_update_audio_infoframe(connector,
+								       &hparms->cea);
 }
 
 int adv7511_hdmi_audio_startup(struct drm_bridge *bridge,
@@ -188,15 +181,9 @@ int adv7511_hdmi_audio_startup(struct drm_bridge *bridge,
 	/* not copyrighted */
 	regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_CFG1,
 				BIT(5), BIT(5));
-	/* enable audio infoframes */
-	regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE1,
-				BIT(3), BIT(3));
 	/* AV mute disable */
 	regmap_update_bits(adv7511->regmap, ADV7511_REG_GC(0),
 				BIT(7) | BIT(6), BIT(7));
-	/* use Audio infoframe updated info */
-	regmap_update_bits(adv7511->regmap, ADV7511_REG_INFOFRAME_UPDATE,
-				BIT(5), 0);
 
 	/* enable SPDIF receiver */
 	if (adv7511->audio_source == ADV7511_AUDIO_SOURCE_SPDIF)
@@ -214,4 +201,6 @@ void adv7511_hdmi_audio_shutdown(struct drm_bridge *bridge,
 	if (adv7511->audio_source == ADV7511_AUDIO_SOURCE_SPDIF)
 		regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_CONFIG,
 				   BIT(7), 0);
+
+	drm_atomic_helper_connector_hdmi_clear_audio_infoframe(connector);
 }
diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
index 26f8310382d8d1632dda5185b2b0230b59a6063a..b9be8654130758e69ac7ccbc73a82cc25d731a5c 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
@@ -893,6 +893,9 @@ static int adv7511_bridge_hdmi_clear_infoframe(struct drm_bridge *bridge,
 	struct adv7511 *adv7511 = bridge_to_adv7511(bridge);
 
 	switch (type) {
+	case HDMI_INFOFRAME_TYPE_AUDIO:
+		adv7511_packet_disable(adv7511, ADV7511_PACKET_ENABLE_AUDIO_INFOFRAME);
+		break;
 	case HDMI_INFOFRAME_TYPE_AVI:
 		adv7511_packet_disable(adv7511, ADV7511_PACKET_ENABLE_AVI_INFOFRAME);
 		break;
@@ -917,6 +920,21 @@ static int adv7511_bridge_hdmi_write_infoframe(struct drm_bridge *bridge,
 	struct adv7511 *adv7511 = bridge_to_adv7511(bridge);
 
 	switch (type) {
+	case HDMI_INFOFRAME_TYPE_AUDIO:
+		/* send current Audio infoframe values while updating */
+		regmap_update_bits(adv7511->regmap, ADV7511_REG_INFOFRAME_UPDATE,
+				   BIT(5), BIT(5));
+
+		/* The Audio infoframe id is not configurable */
+		regmap_bulk_write(adv7511->regmap, ADV7511_REG_AUDIO_INFOFRAME_VERSION,
+				  buffer + 1, len - 1);
+
+		/* use Audio infoframe updated info */
+		regmap_update_bits(adv7511->regmap, ADV7511_REG_INFOFRAME_UPDATE,
+				   BIT(5), 0);
+
+		adv7511_packet_enable(adv7511, ADV7511_PACKET_ENABLE_AUDIO_INFOFRAME);
+		break;
 	case HDMI_INFOFRAME_TYPE_AVI:
 		/* send current AVI infoframe values while updating */
 		regmap_update_bits(adv7511->regmap, ADV7511_REG_INFOFRAME_UPDATE,

-- 
2.47.2

On Wed, 3 Sep 2025 19:21:29 +0300, Dmitry Baryshkov wrote:
> Instead of writing the first byte of the infoframe (and hoping that the
> rest is default / zeroes), hook Audio InfoFrame support into the
> write_infoframe / clear_infoframes callbacks and use
> drm_atomic_helper_connector_hdmi_update_audio_infoframe() to write the
> frame.
> 
> [ ... ]

Acked-by: Maxime Ripard <mripard@kernel.org>

Thanks!
Maxime