ALSA: dice: Change the way to start stream

Streaming functionality can start streams when rate is given but currently
some codes are in PCM functionality.

This commit changes the way to start stream and add some arrangement
to make it easy to understand the way.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Acked-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 6 insertions, 69 deletions

diff --git a/sound/firewire/dice/dice-pcm.c b/sound/firewire/dice/dice-pcm.c
index 2e531bd30e28..b185391dc021 100644
--- a/sound/firewire/dice/dice-pcm.c
+++ b/sound/firewire/dice/dice-pcm.c
@@ -169,65 +169,11 @@ static int playback_hw_params(struct snd_pcm_substream *substream,
 			      struct snd_pcm_hw_params *hw_params)
 {
 	struct snd_dice *dice = substream->private_data;
-	unsigned int mode, rate, channels, i;
-	int err;
-
-	mutex_lock(&dice->mutex);
-	snd_dice_stream_stop(dice);
-	mutex_unlock(&dice->mutex);
-
-	err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
-					       params_buffer_bytes(hw_params));
-	if (err < 0)
-		return err;
-
-	rate = params_rate(hw_params);
-	err = snd_dice_transaction_set_rate(dice, rate);
-	if (err < 0)
-		return err;
-
-	if (snd_dice_stream_get_rate_mode(dice, rate, &mode) < 0)
-		return err;
-
-	/*
-	 * At 176.4/192.0 kHz, Dice has a quirk to transfer two PCM frames in
-	 * one data block of AMDTP packet. Thus sampling transfer frequency is
-	 * a half of PCM sampling frequency, i.e. PCM frames at 192.0 kHz are
-	 * transferred on AMDTP packets at 96 kHz. Two successive samples of a
-	 * channel are stored consecutively in the packet. This quirk is called
-	 * as 'Dual Wire'.
-	 * For this quirk, blocking mode is required and PCM buffer size should
-	 * be aligned to SYT_INTERVAL.
-	 */
-	channels = params_channels(hw_params);
-	if (mode > 1) {
-		if (channels > AMDTP_MAX_CHANNELS_FOR_PCM / 2) {
-			err = -ENOSYS;
-			return err;
-		}
-
-		rate /= 2;
-		channels *= 2;
-		dice->rx_stream.double_pcm_frames = true;
-	} else {
-		dice->rx_stream.double_pcm_frames = false;
-	}
-
-	amdtp_stream_set_parameters(&dice->rx_stream, rate, channels,
-				    dice->rx_midi_ports[mode]);
-	if (mode > 1) {
-		channels /= 2;
-
-		for (i = 0; i < channels; i++) {
-			dice->rx_stream.pcm_positions[i] = i * 2;
-			dice->rx_stream.pcm_positions[i + channels] = i * 2 + 1;
-		}
-	}
-
 	amdtp_stream_set_pcm_format(&dice->rx_stream,
 				    params_format(hw_params));
 
-	return 0;
+	return snd_pcm_lib_alloc_vmalloc_buffer(substream,
+						params_buffer_bytes(hw_params));
 }
 
 static int playback_hw_free(struct snd_pcm_substream *substream)
@@ -247,21 +193,12 @@ static int playback_prepare(struct snd_pcm_substream *substream)
 	int err;
 
 	mutex_lock(&dice->mutex);
-
-	if (amdtp_streaming_error(&dice->rx_stream))
-		snd_dice_stream_stop_packets(dice);
-
-	err = snd_dice_stream_start(dice);
-	if (err < 0) {
-		mutex_unlock(&dice->mutex);
-		return err;
-	}
-
+	err = snd_dice_stream_start(dice, substream->runtime->rate);
 	mutex_unlock(&dice->mutex);
+	if (err >= 0)
+		amdtp_stream_pcm_prepare(&dice->rx_stream);
 
-	amdtp_stream_pcm_prepare(&dice->rx_stream);
-
-	return 0;
+	return err;
 }
 
 static int playback_trigger(struct snd_pcm_substream *substream, int cmd)