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@xxxxxx>
---
drivers/video/omap2/dss/dss.h | 8 ++
drivers/video/omap2/dss/hdmi.c | 42 ++++++++++
drivers/video/omap2/dss/hdmi_panel.c | 140 ++++++++++++++++++++++++++++++++++
3 files changed, 190 insertions(+), 0 deletions(-)
diff --git a/drivers/video/omap2/dss/dss.h b/drivers/video/omap2/dss/dss.h
index d4b3dff..ec4aa14 100644
--- a/drivers/video/omap2/dss/dss.h
+++ b/drivers/video/omap2/dss/dss.h
@@ -514,6 +514,14 @@ int omapdss_hdmi_read_edid(u8 *buf, int len);
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 */
#ifdef CONFIG_OMAP2_DSS_RFBI
diff --git a/drivers/video/omap2/dss/hdmi.c b/drivers/video/omap2/dss/hdmi.c
index aee0acf..388301e 100644
--- a/drivers/video/omap2/dss/hdmi.c
+++ b/drivers/video/omap2/dss/hdmi.c
@@ -673,6 +673,48 @@ int hdmi_compute_acr(u32 sample_freq, u32 *n, u32 *cts)
return 0;
}
+
+int hdmi_audio_enable(void)
+{
+ DSSDBG("audio_enable\n");
+
+ return hdmi.ip_data.ops->audio_enable(&hdmi.ip_data);
+}
+
+void hdmi_audio_disable(void)
+{
+ DSSDBG("audio_disable\n");
+
+ hdmi.ip_data.ops->audio_disable(&hdmi.ip_data);
+}
+
+int hdmi_audio_start(void)
+{
+ DSSDBG("audio_start\n");
+
+ return hdmi.ip_data.ops->audio_start(&hdmi.ip_data);
+}
+
+void hdmi_audio_stop(void)
+{
+ DSSDBG("audio_stop\n");
+
+ hdmi.ip_data.ops->audio_stop(&hdmi.ip_data);
+}
+
+bool hdmi_mode_has_audio(void)
+{
+ if (hdmi.ip_data.cfg.cm.mode == HDMI_HDMI)
+ return true;
+ else
+ return false;
+}
+
+int hdmi_audio_config(struct omap_dss_audio *audio)
+{
+ return hdmi.ip_data.ops->audio_config(&hdmi.ip_data, audio);
+}
+
#endif
/* HDMI HW IP initialisation */
diff --git a/drivers/video/omap2/dss/hdmi_panel.c b/drivers/video/omap2/dss/hdmi_panel.c
index 5e215d6..a8419c3 100644
--- a/drivers/video/omap2/dss/hdmi_panel.c
+++ b/drivers/video/omap2/dss/hdmi_panel.c
@@ -32,6 +32,10 @@
static struct {
/* This protects the panel ops, mainly when accessing the HDMI IP. */
struct mutex lock;
+#if defined(CONFIG_OMAP4_DSS_HDMI_AUDIO)
+ /* This protects the audio ops, specifically. */
+ spinlock_t audio_lock;
+#endif
} hdmi;
@@ -55,6 +59,130 @@ static void hdmi_panel_remove(struct omap_dss_device *dssdev)
}
+#if defined(CONFIG_OMAP4_DSS_HDMI_AUDIO)
+static int hdmi_panel_audio_enable(struct omap_dss_device *dssdev)
+{
+ unsigned long flags;
+ int r;
+
+ mutex_lock(&hdmi.lock);
+ spin_lock_irqsave(&hdmi.audio_lock, flags);
+
+ /* audio can be enabled only if the display is active */
+ if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE) {
+ DSSERR("display is not active\n");
+ r = -EPERM;
+ goto err;
+ }
+
+ r = hdmi_audio_enable();
+
+ if (!r)
+ dssdev->audio_state = OMAP_DSS_AUDIO_ENABLED;
+
+err:
+ spin_unlock_irqrestore(&hdmi.audio_lock, flags);
+ mutex_unlock(&hdmi.lock);
+ return r;
+}
+
+static void hdmi_panel_audio_disable(struct omap_dss_device *dssdev)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&hdmi.audio_lock, flags);
+
+ hdmi_audio_disable();
+
+ dssdev->audio_state = OMAP_DSS_AUDIO_DISABLED;
+
+ spin_unlock_irqrestore(&hdmi.audio_lock, flags);
+}
+
+static int hdmi_panel_audio_start(struct omap_dss_device *dssdev)
+{
+ unsigned long flags;
+ int r;
+
+ spin_lock_irqsave(&hdmi.audio_lock, flags);
+ /*
+ * No need to check the panel state. It was checked when trasitioning
+ * to AUDIO_ENABLED.
+ */
+ if (dssdev->audio_state != OMAP_DSS_AUDIO_ENABLED) {
+ DSSERR("audio start from invalid state\n");
+ r = -EPERM;
+ goto err;
+ }
+
+ r = hdmi_audio_start();
+
+ if (!r)
+ dssdev->audio_state = OMAP_DSS_AUDIO_PLAYING;
+
+err:
+ spin_unlock_irqrestore(&hdmi.audio_lock, flags);
+ return r;
+}
+
+static void hdmi_panel_audio_stop(struct omap_dss_device *dssdev)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&hdmi.audio_lock, flags);
+
+ hdmi_audio_stop();
+ dssdev->audio_state = OMAP_DSS_AUDIO_ENABLED;
+
+ spin_unlock_irqrestore(&hdmi.audio_lock, flags);
+}
+
+static bool hdmi_panel_audio_supported(struct omap_dss_device *dssdev)
+{
+ bool r = false;
+
+ mutex_lock(&hdmi.lock);
+
+ if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
+ goto err;
+
+ if (!hdmi_mode_has_audio())
+ goto err;
+
+ r = true;
+err:
+ mutex_unlock(&hdmi.lock);
+ return r;
+}
+
+static int hdmi_panel_audio_config(struct omap_dss_device *dssdev,
+ struct omap_dss_audio *audio)
+{
+ unsigned long flags;
+ int r;
+
+ mutex_lock(&hdmi.lock);
+ spin_lock_irqsave(&hdmi.audio_lock, flags);
+
+ /* it only makes sense to configure audio if the display is active */
+ if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE) {
+ DSSERR("display is not active\n");
+ r = -EPERM;
+ goto err;
+ }
+
+ r = hdmi_audio_config(audio);
+
+ if (!r)
+ dssdev->audio_state = OMAP_DSS_AUDIO_CONFIGURED;
+
+err:
+ spin_unlock_irqrestore(&hdmi.audio_lock, flags);
+ mutex_unlock(&hdmi.lock);
+ return r;
+}
+#endif
+
static int hdmi_panel_enable(struct omap_dss_device *dssdev)
{
int r = 0;
@@ -235,6 +363,14 @@ static struct omap_dss_driver hdmi_driver = {
.check_timings = hdmi_check_timings,
.read_edid = hdmi_read_edid,
.detect = hdmi_detect,
+#if defined(CONFIG_OMAP4_DSS_HDMI_AUDIO)
+ .audio_enable = hdmi_panel_audio_enable,
+ .audio_disable = hdmi_panel_audio_disable,
+ .audio_start = hdmi_panel_audio_start,
+ .audio_stop = hdmi_panel_audio_stop,
+ .audio_supported = hdmi_panel_audio_supported,
+ .audio_config = hdmi_panel_audio_config,
+#endif
.driver = {
.name = "hdmi_panel",
.owner = THIS_MODULE,
@@ -245,6 +381,10 @@ int hdmi_panel_init(void)
{
mutex_init(&hdmi.lock);
+#if defined(CONFIG_OMAP4_DSS_HDMI_AUDIO)
+ spin_lock_init(&hdmi.audio_lock);
+#endif
+
omap_dss_register_driver(&hdmi_driver);
return 0;
--
1.7.5.4
--
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