From 1bc8e12d9480e072a7818e9cc51ff901662f2d22 Mon Sep 17 00:00:00 2001 From: Takashi Sakamoto Date: Mon, 8 Feb 2016 22:54:16 +0900 Subject: ALSA: dice: limit stream to current sampling transfer frequency. In previous commit, ALSA Dice driver limits PCM substreams at current sampling transfer frequency and current number of Multi bit linear audio data channel. Thus, the driver has no need to start AMDTP streams at the other sampling transfer frequency except for current one. This is due to Dice interface design. This commit limits AMDTP stream at current sampling transfer frequency, according to the design. Signed-off-by: Takashi Sakamoto Signed-off-by: Takashi Iwai --- sound/firewire/dice/dice-stream.c | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) (limited to 'sound/firewire') diff --git a/sound/firewire/dice/dice-stream.c b/sound/firewire/dice/dice-stream.c index a6a39f7ef58d..4f74e3ef58fd 100644 --- a/sound/firewire/dice/dice-stream.c +++ b/sound/firewire/dice/dice-stream.c @@ -99,6 +99,7 @@ static int start_stream(struct snd_dice *dice, struct amdtp_stream *stream, unsigned int rate) { struct fw_iso_resources *resources; + __be32 reg[2]; unsigned int i, mode, pcm_chs, midi_ports; bool double_pcm_frames; int err; @@ -108,14 +109,20 @@ static int start_stream(struct snd_dice *dice, struct amdtp_stream *stream, goto end; if (stream == &dice->tx_stream) { resources = &dice->tx_resources; - pcm_chs = dice->tx_channels[mode]; - midi_ports = dice->tx_midi_ports[mode]; + err = snd_dice_transaction_read_tx(dice, TX_NUMBER_AUDIO, + reg, sizeof(reg)); } else { resources = &dice->rx_resources; - pcm_chs = dice->rx_channels[mode]; - midi_ports = dice->rx_midi_ports[mode]; + err = snd_dice_transaction_read_rx(dice, RX_NUMBER_AUDIO, + reg, sizeof(reg)); } + if (err < 0) + goto end; + + pcm_chs = be32_to_cpu(reg[0]); + midi_ports = be32_to_cpu(reg[1]); + /* * 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 @@ -224,8 +231,10 @@ int snd_dice_stream_start_duplex(struct snd_dice *dice, unsigned int rate) } if (rate == 0) rate = curr_rate; - if (rate != curr_rate) - stop_stream(dice, master); + if (rate != curr_rate) { + err = -EINVAL; + goto end; + } if (!amdtp_stream_running(master)) { stop_stream(dice, slave); -- cgit v1.2.3