ALSA: fireworks: unify substream counter

This commit is a part of preparation to perform allocation/release
of isochronous resources in pcm.hw_params/hw_free callbacks.

It's inconvenient to handle two isochronous context separately
each other. This commit unifies the counters to handle the two
at the same time.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/fireworks/fireworks.h

@@ -89,8 +89,7 @@ struct snd_efw {
 	struct amdtp_stream rx_stream;
 	struct cmp_connection out_conn;
 	struct cmp_connection in_conn;
-	unsigned int capture_substreams;
-	unsigned int playback_substreams;
+	unsigned int substreams_counter;
 
 	/* hardware metering parameters */
 	unsigned int phys_out;

sound/firewire/fireworks/fireworks_midi.c

@@ -18,7 +18,7 @@ static int midi_capture_open(struct snd_rawmidi_substream *substream)
 		goto end;
 
 	mutex_lock(&efw->mutex);
-	efw->capture_substreams++;
+	++efw->substreams_counter;
 	err = snd_efw_stream_start_duplex(efw, 0);
 	mutex_unlock(&efw->mutex);
 	if (err < 0)
@@ -38,7 +38,7 @@ static int midi_playback_open(struct snd_rawmidi_substream *substream)
 		goto end;
 
 	mutex_lock(&efw->mutex);
-	efw->playback_substreams++;
+	++efw->substreams_counter;
 	err = snd_efw_stream_start_duplex(efw, 0);
 	mutex_unlock(&efw->mutex);
 	if (err < 0)
@@ -52,7 +52,7 @@ static int midi_capture_close(struct snd_rawmidi_substream *substream)
 	struct snd_efw *efw = substream->rmidi->private_data;
 
 	mutex_lock(&efw->mutex);
-	efw->capture_substreams--;
+	--efw->substreams_counter;
 	snd_efw_stream_stop_duplex(efw);
 	mutex_unlock(&efw->mutex);
 
@@ -65,7 +65,7 @@ static int midi_playback_close(struct snd_rawmidi_substream *substream)
 	struct snd_efw *efw = substream->rmidi->private_data;
 
 	mutex_lock(&efw->mutex);
-	efw->playback_substreams--;
+	--efw->substreams_counter;
 	snd_efw_stream_stop_duplex(efw);
 	mutex_unlock(&efw->mutex);
 

sound/firewire/fireworks/fireworks_pcm.c

@@ -232,7 +232,7 @@ static int pcm_capture_hw_params(struct snd_pcm_substream *substream,
 
 	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 		mutex_lock(&efw->mutex);
-		efw->capture_substreams++;
+		++efw->substreams_counter;
 		mutex_unlock(&efw->mutex);
 	}
 
@@ -251,7 +251,7 @@ static int pcm_playback_hw_params(struct snd_pcm_substream *substream,
 
 	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 		mutex_lock(&efw->mutex);
-		efw->playback_substreams++;
+		++efw->substreams_counter;
 		mutex_unlock(&efw->mutex);
 	}
 
@@ -264,7 +264,7 @@ static int pcm_capture_hw_free(struct snd_pcm_substream *substream)
 
 	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) {
 		mutex_lock(&efw->mutex);
-		efw->capture_substreams--;
+		--efw->substreams_counter;
 		mutex_unlock(&efw->mutex);
 	}
 
@@ -278,7 +278,7 @@ static int pcm_playback_hw_free(struct snd_pcm_substream *substream)
 
 	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) {
 		mutex_lock(&efw->mutex);
-		efw->playback_substreams--;
+		--efw->substreams_counter;
 		mutex_unlock(&efw->mutex);
 	}
 

sound/firewire/fireworks/fireworks_stream.c

@@ -194,9 +194,9 @@ int snd_efw_stream_start_duplex(struct snd_efw *efw, unsigned int rate)
 	unsigned int curr_rate;
 	int err = 0;
 
-	/* Need no substreams */
-	if (efw->playback_substreams == 0 && efw->capture_substreams  == 0)
-		goto end;
+	// Need no substreams.
+	if (efw->substreams_counter == 0)
+		return -EIO;
 
 	/*
 	 * Considering JACK/FFADO streaming:
@@ -206,19 +206,15 @@ int snd_efw_stream_start_duplex(struct snd_efw *efw, unsigned int rate)
 	if (err < 0)
 		goto end;
 
-	/* packet queueing error */
-	if (amdtp_streaming_error(&efw->tx_stream))
-		stop_stream(efw, &efw->tx_stream);
-	if (amdtp_streaming_error(&efw->rx_stream))
-		stop_stream(efw, &efw->rx_stream);
-
 	/* stop streams if rate is different */
 	err = snd_efw_command_get_sampling_rate(efw, &curr_rate);
 	if (err < 0)
 		goto end;
 	if (rate == 0)
 		rate = curr_rate;
-	if (rate != curr_rate) {
+	if (rate != curr_rate ||
+	    amdtp_streaming_error(&efw->tx_stream) ||
+	    amdtp_streaming_error(&efw->rx_stream)) {
 		stop_stream(efw, &efw->tx_stream);
 		stop_stream(efw, &efw->rx_stream);
 	}
@@ -237,13 +233,12 @@ int snd_efw_stream_start_duplex(struct snd_efw *efw, unsigned int rate)
 		}
 	}
 
-	/* start slave if needed */
-	if (efw->capture_substreams > 0 &&
-	    !amdtp_stream_running(&efw->tx_stream)) {
+	if (!amdtp_stream_running(&efw->tx_stream)) {
 		err = start_stream(efw, &efw->tx_stream, rate);
 		if (err < 0) {
 			dev_err(&efw->unit->device,
 				"fail to start AMDTP slave stream:%d\n", err);
+			stop_stream(efw, &efw->tx_stream);
 			stop_stream(efw, &efw->rx_stream);
 		}
 	}
@@ -253,10 +248,8 @@ int snd_efw_stream_start_duplex(struct snd_efw *efw, unsigned int rate)
 
 void snd_efw_stream_stop_duplex(struct snd_efw *efw)
 {
-	if (efw->capture_substreams == 0) {
+	if (efw->substreams_counter == 0) {
 		stop_stream(efw, &efw->tx_stream);
-
-		if (efw->playback_substreams == 0)
 		stop_stream(efw, &efw->rx_stream);
 	}
 }