OMAPDSS: HDMI: Implement DSS driver interface for audio
Implement the DSS device driver audio support interface in the HDMI
panel driver and generic driver. The implementation relies on the
IP-specific functions that are defined at DSS probe time.
A mixed locking strategy is used. The panel's mutex is used when
the state of the panel is queried as required by the audio functions.
The audio state is protected using a spinlock as users of DSS HDMI
audio functionality might start/stop audio while holding a spinlock.
The mutex and the spinlock are held and released as needed by each
individual function to protect the panel state and the audio state.
Although the panel's audio_start functions does not check whether
the panel is active, the audio _ENABLED state can be reached only
from audio_enable, which does check the state of the panel. Also,
if the panel is ever disabled, the audio state will transition
to _DISABLED. Transitions are always protected by the audio lock.
Signed-off-by: Ricardo Neri <ricardo.neri@ti.com>
diff --git a/drivers/video/omap2/dss/dss.h b/drivers/video/omap2/dss/dss.h
index d5cb19f..4aa9529 100644
--- a/drivers/video/omap2/dss/dss.h
+++ b/drivers/video/omap2/dss/dss.h
@@ -464,6 +464,14 @@
bool omapdss_hdmi_detect(void);
int hdmi_panel_init(void);
void hdmi_panel_exit(void);
+#ifdef CONFIG_OMAP4_DSS_HDMI_AUDIO
+int hdmi_audio_enable(void);
+void hdmi_audio_disable(void);
+int hdmi_audio_start(void);
+void hdmi_audio_stop(void);
+bool hdmi_mode_has_audio(void);
+int hdmi_audio_config(struct omap_dss_audio *audio);
+#endif
/* RFBI */
int rfbi_init_platform_driver(void) __init;