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ALSA: dice: code refactoring to stop packet streaming 

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

There're three points to finish packet streaming but no helper
functions for common operations for it. This commit adds a helper
function for operations to finish packet streaming.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2019-06-11 22:21:14 +09:00 committed by Takashi Iwai
parent 478f3a56dc
commit b3480638a5
1 changed files with 14 additions and 13 deletions
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27
sound/firewire/dice/dice-stream.c
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@ -230,6 +230,15 @@ static int keep_resources(struct snd_dice *dice,
fw_parent_device(dice->unit)->max_speed);
}
static void finish_session(struct snd_dice *dice, struct reg_params *tx_params,
struct reg_params *rx_params)
{
stop_streams(dice, AMDTP_IN_STREAM, tx_params);
stop_streams(dice, AMDTP_OUT_STREAM, rx_params);
snd_dice_transaction_clear_enable(dice);
}
static int start_streams(struct snd_dice *dice, enum amdtp_stream_direction dir,
unsigned int rate, struct reg_params *params)
{
@ -328,10 +337,8 @@ static int start_duplex_streams(struct snd_dice *dice, unsigned int rate)
if (err < 0)
return err;
/* Stop transmission. */
stop_streams(dice, AMDTP_IN_STREAM, &tx_params);
stop_streams(dice, AMDTP_OUT_STREAM, &rx_params);
snd_dice_transaction_clear_enable(dice);
// Stop transmission.
finish_session(dice, &tx_params, &rx_params);
release_resources(dice);
err = ensure_phase_lock(dice, rate);
@ -373,9 +380,7 @@ static int start_duplex_streams(struct snd_dice *dice, unsigned int rate)
return 0;
error:
stop_streams(dice, AMDTP_IN_STREAM, &tx_params);
stop_streams(dice, AMDTP_OUT_STREAM, &rx_params);
snd_dice_transaction_clear_enable(dice);
finish_session(dice, &tx_params, &rx_params);
release_resources(dice);
return err;
}
@ -449,12 +454,8 @@ void snd_dice_stream_stop_duplex(struct snd_dice *dice)
if (dice->substreams_counter > 0)
return;
snd_dice_transaction_clear_enable(dice);
if (get_register_params(dice, &tx_params, &rx_params) == 0) {
stop_streams(dice, AMDTP_IN_STREAM, &tx_params);
stop_streams(dice, AMDTP_OUT_STREAM, &rx_params);
}
if (get_register_params(dice, &tx_params, &rx_params) >= 0)
finish_session(dice, &tx_params, &rx_params);
release_resources(dice);
}