[U-Boot] [PATCH 22/33] sandbox: sound: Silence sound for testing

[Simon Glass]

When testing the sound system we don't need the hear the beeps. The
testing works by checking the data that would be emitted. Add a
device-tree property to silence the sound, and enable it for testing.

Signed-off-by: Simon Glass <s...@chromium.org>
---

 arch/sandbox/dts/test.dts |  1 +
 drivers/sound/sandbox.c   | 23 +++++++++++++++++++++--
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts
index 9144430cc0..5748cd60b1 100644
--- a/arch/sandbox/dts/test.dts
+++ b/arch/sandbox/dts/test.dts
@@ -389,6 +389,7 @@
        i2s: i2s {
                compatible = "sandbox,i2s";
                #sound-dai-cells = <1>;
+               sandbox,silent; /* Don't emit sounds while testing */
        };
 
        misc-test {
diff --git a/drivers/sound/sandbox.c b/drivers/sound/sandbox.c
index 600523160f..4b57ef6759 100644
--- a/drivers/sound/sandbox.c
+++ b/drivers/sound/sandbox.c
@@ -3,6 +3,8 @@
  * Copyright (c) 2013 Google, Inc
  */
 
+#define LOG_CATEGORY UCLASS_SOUND
+
 #include <common.h>
 #include <audio_codec.h>
 #include <dm.h>
@@ -20,6 +22,7 @@ struct sandbox_codec_priv {
 
 struct sandbox_i2s_priv {
        int sum;        /* Use to sum the provided audio data */
+       bool silent;    /* Sound is silent, don't use SDL */
 };
 
 struct sandbox_sound_priv {
@@ -101,12 +104,21 @@ static int sandbox_i2s_tx_data(struct udevice *dev, void 
*data,
        for (i = 0; i < data_size; i++)
                priv->sum += ((uint8_t *)data)[i];
 
-       return sandbox_sdl_sound_play(data, data_size);
+       if (!priv->silent) {
+               int ret;
+
+               ret = sandbox_sdl_sound_play(data, data_size);
+               if (ret)
+                       return ret;
+       }
+
+       return 0;
 }
 
 static int sandbox_i2s_probe(struct udevice *dev)
 {
        struct i2s_uc_priv *uc_priv = dev_get_uclass_priv(dev);
+       struct sandbox_i2s_priv *priv = dev_get_priv(dev);
 
        /* Use hard-coded values here */
        uc_priv->rfs = 256;
@@ -117,8 +129,15 @@ static int sandbox_i2s_probe(struct udevice *dev)
        uc_priv->channels = 2;
        uc_priv->id = 1;
 
+       priv->silent = dev_read_bool(dev, "sandbox,silent");
+
        /* Ignore any error here - we'll just have no sound */
-       sandbox_sdl_sound_init(uc_priv->samplingrate, uc_priv->channels);
+       if (priv->silent) {
+               log_warning("Sound is silenced\n");
+       } else if (sandbox_sdl_sound_init(uc_priv->samplingrate,
+                                         uc_priv->channels)) {
+               priv->silent = true;
+       }
 
        return 0;
 }
-- 
2.20.1.321.g9e740568ce-goog

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