OMAPDSS: HDMI: Decouple wrapper enable/disable and audio start/stop

Decouple the enable/disable operation of the HDMI audio wrapper from
audio start/stop. Otherwise, an audio FIFO underflow may occur. The
audio wrapper enablement must be done after configuration and
before audio playback is started.

Signed-off-by: Axel Castaneda Gonzalez <x0055901@ti.com>
Signed-off-by: Ricardo Neri <ricardo.neri@ti.com>

drivers/video/omap2/dss/dss_features.c

@@ -577,6 +577,8 @@ static const struct ti_hdmi_ip_ops omap4_hdmi_functions = {
 	defined(CONFIG_SND_OMAP_SOC_OMAP4_HDMI_MODULE)
 	.audio_enable		=       ti_hdmi_4xxx_wp_audio_enable,
 	.audio_disable		=       ti_hdmi_4xxx_wp_audio_disable,
+	.audio_start		=       ti_hdmi_4xxx_audio_start,
+	.audio_stop		=       ti_hdmi_4xxx_audio_stop,
 #endif
 
 };

drivers/video/omap2/dss/ti_hdmi.h

@@ -113,6 +113,10 @@ struct ti_hdmi_ip_ops {
 	int (*audio_enable)(struct hdmi_ip_data *ip_data);
 
 	void (*audio_disable)(struct hdmi_ip_data *ip_data);
+
+	int (*audio_start)(struct hdmi_ip_data *ip_data);
+
+	void (*audio_stop)(struct hdmi_ip_data *ip_data);
 #endif
 
 };
@@ -190,5 +194,7 @@ void ti_hdmi_4xxx_phy_dump(struct hdmi_ip_data *ip_data, struct seq_file *s);
 	defined(CONFIG_SND_OMAP_SOC_OMAP4_HDMI_MODULE)
 int ti_hdmi_4xxx_wp_audio_enable(struct hdmi_ip_data *ip_data);
 void ti_hdmi_4xxx_wp_audio_disable(struct hdmi_ip_data *ip_data);
+int ti_hdmi_4xxx_audio_start(struct hdmi_ip_data *ip_data);
+void ti_hdmi_4xxx_audio_stop(struct hdmi_ip_data *ip_data);
 #endif
 #endif

drivers/video/omap2/dss/ti_hdmi_4xxx_ip.c

@@ -1254,21 +1254,30 @@ int hdmi_config_audio_acr(struct hdmi_ip_data *ip_data,
 
 int ti_hdmi_4xxx_wp_audio_enable(struct hdmi_ip_data *ip_data)
 {
-	REG_FLD_MOD(hdmi_av_base(ip_data),
-		    HDMI_CORE_AV_AUD_MODE, true, 0, 0);
 	REG_FLD_MOD(hdmi_wp_base(ip_data),
 		    HDMI_WP_AUDIO_CTRL, true, 31, 31);
+	return 0;
+}
+
+void ti_hdmi_4xxx_wp_audio_disable(struct hdmi_ip_data *ip_data)
+{
+	REG_FLD_MOD(hdmi_wp_base(ip_data),
+		    HDMI_WP_AUDIO_CTRL, false, 31, 31);
+}
+
+int ti_hdmi_4xxx_audio_start(struct hdmi_ip_data *ip_data)
+{
+	REG_FLD_MOD(hdmi_av_base(ip_data),
+		    HDMI_CORE_AV_AUD_MODE, true, 0, 0);
 	REG_FLD_MOD(hdmi_wp_base(ip_data),
 		    HDMI_WP_AUDIO_CTRL, true, 30, 30);
 	return 0;
 }
 
-void ti_hdmi_4xxx_wp_audio_disable(struct hdmi_ip_data *ip_data)
+void ti_hdmi_4xxx_audio_stop(struct hdmi_ip_data *ip_data)
 {
 	REG_FLD_MOD(hdmi_av_base(ip_data),
 		    HDMI_CORE_AV_AUD_MODE, false, 0, 0);
-	REG_FLD_MOD(hdmi_wp_base(ip_data),
-		    HDMI_WP_AUDIO_CTRL, false, 31, 31);
 	REG_FLD_MOD(hdmi_wp_base(ip_data),
 		    HDMI_WP_AUDIO_CTRL, false, 30, 30);
 }