linux-kernel - [PATCH v2 4/6] drm/bridge: dw-hdmi: Add API dw_hdmi_set_sample

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Message-Id: <20250724072248.1517569-5-shengjiu.wang@nxp.com>
Date: Thu, 24 Jul 2025 15:22:46 +0800
From: Shengjiu Wang <shengjiu.wang@....com>
To: andrzej.hajda@...el.com,
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Subject: [PATCH v2 4/6] drm/bridge: dw-hdmi: Add API dw_hdmi_set_sample_iec958() for iec958 format

Add API dw_hdmi_set_sample_iec958() for iec958 format because audio device
driver needs iec958 information to configure this specific setting.

Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c |  5 +++++
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c          | 12 +++++++++++-
 include/drm/bridge/dw_hdmi.h                       |  3 ++-
 3 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c
index ab18f9a3bf23..df7a37eb47f4 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c
@@ -90,6 +90,11 @@ static int audio_hw_params(struct device *dev,  void *data,
 				   params->iec.status[0] & IEC958_AES0_NONAUDIO);
 	dw_hdmi_set_sample_width(dw->data.hdmi, params->sample_width);
 
+	if (daifmt->bit_fmt == SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE)
+		dw_hdmi_set_sample_iec958(dw->data.hdmi, 1);
+	else
+		dw_hdmi_set_sample_iec958(dw->data.hdmi, 0);
+
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 8d096b569cf1..3b77e73ac0ea 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -177,6 +177,7 @@ struct dw_hdmi {
 
 	spinlock_t audio_lock;
 	struct mutex audio_mutex;
+	unsigned int sample_iec958;
 	unsigned int sample_non_pcm;
 	unsigned int sample_width;
 	unsigned int sample_rate;
@@ -718,6 +719,14 @@ void dw_hdmi_set_sample_non_pcm(struct dw_hdmi *hdmi, unsigned int non_pcm)
 }
 EXPORT_SYMBOL_GPL(dw_hdmi_set_sample_non_pcm);
 
+void dw_hdmi_set_sample_iec958(struct dw_hdmi *hdmi, unsigned int iec958)
+{
+	mutex_lock(&hdmi->audio_mutex);
+	hdmi->sample_iec958 = iec958;
+	mutex_unlock(&hdmi->audio_mutex);
+}
+EXPORT_SYMBOL_GPL(dw_hdmi_set_sample_iec958);
+
 void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate)
 {
 	mutex_lock(&hdmi->audio_mutex);
@@ -849,7 +858,8 @@ static void dw_hdmi_gp_audio_enable(struct dw_hdmi *hdmi)
 				    hdmi->channels,
 				    hdmi->sample_width,
 				    hdmi->sample_rate,
-				    hdmi->sample_non_pcm);
+				    hdmi->sample_non_pcm,
+				    hdmi->sample_iec958);
 }
 
 static void dw_hdmi_gp_audio_disable(struct dw_hdmi *hdmi)
diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
index b8fc4fdf5a21..095cdd9b7424 100644
--- a/include/drm/bridge/dw_hdmi.h
+++ b/include/drm/bridge/dw_hdmi.h
@@ -145,7 +145,7 @@ struct dw_hdmi_plat_data {
 
 	/* Platform-specific audio enable/disable (optional) */
 	void (*enable_audio)(struct dw_hdmi *hdmi, int channel,
-			     int width, int rate, int non_pcm);
+			     int width, int rate, int non_pcm, int iec958);
 	void (*disable_audio)(struct dw_hdmi *hdmi);
 
 	/* Vendor PHY support */
@@ -179,6 +179,7 @@ void dw_hdmi_setup_rx_sense(struct dw_hdmi *hdmi, bool hpd, bool rx_sense);
 int dw_hdmi_set_plugged_cb(struct dw_hdmi *hdmi, hdmi_codec_plugged_cb fn,
 			   struct device *codec_dev);
 void dw_hdmi_set_sample_non_pcm(struct dw_hdmi *hdmi, unsigned int non_pcm);
+void dw_hdmi_set_sample_iec958(struct dw_hdmi *hdmi, unsigned int iec958);
 void dw_hdmi_set_sample_width(struct dw_hdmi *hdmi, unsigned int width);
 void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate);
 void dw_hdmi_set_channel_count(struct dw_hdmi *hdmi, unsigned int cnt);
-- 
2.34.1