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ALSA: dice: optimize reading of consecutive registers

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Instead of reading two consecutive register with two quadlet requests,
use one block read request.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
This commit is contained in:
Clemens Ladisch 2011-09-04 22:17:31 +02:00
parent a7304e3bf0
commit a644a9473f
1 changed files with 11 additions and 16 deletions
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27
sound/firewire/dice.c
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@ -374,8 +374,8 @@ static int dice_open(struct snd_pcm_substream *substream)
};
struct dice *dice = substream->private_data;
struct snd_pcm_runtime *runtime = substream->runtime;
__be32 clock_sel, number_audio, number_midi;
unsigned int rate_index, rate;
__be32 clock_sel, data[2];
unsigned int rate_index, number_audio, number_midi;
int err;
err = dice_try_lock(dice);
@ -393,30 +393,25 @@ static int dice_open(struct snd_pcm_substream *substream)
err = -ENXIO;
goto err_lock;
}
rate = dice_rates[rate_index];
err = snd_fw_transaction(dice->unit, TCODE_READ_QUADLET_REQUEST,
err = snd_fw_transaction(dice->unit, TCODE_READ_BLOCK_REQUEST,
rx_address(dice, RX_NUMBER_AUDIO),
&number_audio, 4);
if (err < 0)
goto err_lock;
err = snd_fw_transaction(dice->unit, TCODE_READ_QUADLET_REQUEST,
rx_address(dice, RX_NUMBER_MIDI),
&number_midi, 4);
data, 2 * 4);
if (err < 0)
goto err_lock;
number_audio = be32_to_cpu(data[0]);
number_midi = be32_to_cpu(data[1]);
runtime->hw = hardware;
runtime->hw.rates = snd_pcm_rate_to_rate_bit(rate);
runtime->hw.rates = snd_pcm_rate_to_rate_bit(dice_rates[rate_index]);
snd_pcm_limit_hw_rates(runtime);
runtime->hw.channels_min = be32_to_cpu(number_audio);
runtime->hw.channels_max = be32_to_cpu(number_audio);
runtime->hw.channels_min = number_audio;
runtime->hw.channels_max = number_audio;
amdtp_out_stream_set_parameters(&dice->stream, rate,
be32_to_cpu(number_audio),
be32_to_cpu(number_midi));
amdtp_out_stream_set_parameters(&dice->stream, dice_rates[rate_index],
number_audio, number_midi);
err = snd_pcm_hw_constraint_step(runtime, 0,
SNDRV_PCM_HW_PARAM_PERIOD_SIZE,