drm/bridge: dw-hdmi: move audio channel setup out of ahb

Part of the channel count setup done in dw-hdmi ahb should
actually be done whatever the interface providing the data.

Let's move it to dw-hdmi driver instead.
Reviewed-by: Jonas Karlman <jonas@kwiboo.se>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190812120726.1528-3-jbrunet@baylibre.com

drivers/gpu/drm/bridge/synopsys/dw-hdmi-ahb-audio.c

@@ -63,10 +63,6 @@ enum {
 	HDMI_REVISION_ID = 0x0001,
 	HDMI_IH_AHBDMAAUD_STAT0 = 0x0109,
 	HDMI_IH_MUTE_AHBDMAAUD_STAT0 = 0x0189,
-	HDMI_FC_AUDICONF2 = 0x1027,
-	HDMI_FC_AUDSCONF = 0x1063,
-	HDMI_FC_AUDSCONF_LAYOUT1 = 1 << 0,
-	HDMI_FC_AUDSCONF_LAYOUT0 = 0 << 0,
 	HDMI_AHB_DMA_CONF0 = 0x3600,
 	HDMI_AHB_DMA_START = 0x3601,
 	HDMI_AHB_DMA_STOP = 0x3602,
@@ -403,7 +399,7 @@ static int dw_hdmi_prepare(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_dw_hdmi *dw = substream->private_data;
-	u8 threshold, conf0, conf1, layout, ca;
+	u8 threshold, conf0, conf1, ca;
 
 	/* Setup as per 3.0.5 FSL 4.1.0 BSP */
 	switch (dw->revision) {
@@ -434,20 +430,12 @@ static int dw_hdmi_prepare(struct snd_pcm_substream *substream)
 	conf1 = default_hdmi_channel_config[runtime->channels - 2].conf1;
 	ca = default_hdmi_channel_config[runtime->channels - 2].ca;
 
-	/*
-	 * For >2 channel PCM audio, we need to select layout 1
-	 * and set an appropriate channel map.
-	 */
-	if (runtime->channels > 2)
-		layout = HDMI_FC_AUDSCONF_LAYOUT1;
-	else
-		layout = HDMI_FC_AUDSCONF_LAYOUT0;
-
 	writeb_relaxed(threshold, dw->data.base + HDMI_AHB_DMA_THRSLD);
 	writeb_relaxed(conf0, dw->data.base + HDMI_AHB_DMA_CONF0);
 	writeb_relaxed(conf1, dw->data.base + HDMI_AHB_DMA_CONF1);
-	writeb_relaxed(layout, dw->data.base + HDMI_FC_AUDSCONF);
-	writeb_relaxed(ca, dw->data.base + HDMI_FC_AUDICONF2);
+
+	dw_hdmi_set_channel_count(dw->data.hdmi, runtime->channels);
+	dw_hdmi_set_channel_allocation(dw->data.hdmi, ca);
 
 	switch (runtime->format) {
 	case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE:

drivers/gpu/drm/bridge/synopsys/dw-hdmi.c

@@ -645,6 +645,38 @@ void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate)
 }
 EXPORT_SYMBOL_GPL(dw_hdmi_set_sample_rate);
 
+void dw_hdmi_set_channel_count(struct dw_hdmi *hdmi, unsigned int cnt)
+{
+	u8 layout;
+
+	mutex_lock(&hdmi->audio_mutex);
+
+	/*
+	 * For >2 channel PCM audio, we need to select layout 1
+	 * and set an appropriate channel map.
+	 */
+	if (cnt > 2)
+		layout = HDMI_FC_AUDSCONF_AUD_PACKET_LAYOUT_LAYOUT1;
+	else
+		layout = HDMI_FC_AUDSCONF_AUD_PACKET_LAYOUT_LAYOUT0;
+
+	hdmi_modb(hdmi, layout, HDMI_FC_AUDSCONF_AUD_PACKET_LAYOUT_MASK,
+		  HDMI_FC_AUDSCONF);
+
+	mutex_unlock(&hdmi->audio_mutex);
+}
+EXPORT_SYMBOL_GPL(dw_hdmi_set_channel_count);
+
+void dw_hdmi_set_channel_allocation(struct dw_hdmi *hdmi, unsigned int ca)
+{
+	mutex_lock(&hdmi->audio_mutex);
+
+	hdmi_writeb(hdmi, ca, HDMI_FC_AUDICONF2);
+
+	mutex_unlock(&hdmi->audio_mutex);
+}
+EXPORT_SYMBOL_GPL(dw_hdmi_set_channel_allocation);
+
 static void hdmi_enable_audio_clk(struct dw_hdmi *hdmi, bool enable)
 {
 	if (enable)

include/drm/bridge/dw_hdmi.h

@@ -155,6 +155,8 @@ void dw_hdmi_resume(struct dw_hdmi *hdmi);
 void dw_hdmi_setup_rx_sense(struct dw_hdmi *hdmi, bool hpd, bool rx_sense);
 
 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);
+void dw_hdmi_set_channel_allocation(struct dw_hdmi *hdmi, unsigned int ca);
 void dw_hdmi_audio_enable(struct dw_hdmi *hdmi);
 void dw_hdmi_audio_disable(struct dw_hdmi *hdmi);
 void dw_hdmi_set_high_tmds_clock_ratio(struct dw_hdmi *hdmi);