This commit adds a new functions and some arrangement for PCM limitation. This arrangement is due to the number of channels which each Dice device has.
I note that minimum number for period becomes 2, instead of 1 because its PCM functionality has SNDRV_PCM_INFO_BATCH, this means that the driver uses double (or more) buffering so the minimum number for period should be 2.
Signed-off-by: Takashi Sakamoto o-takashi@sakamocchi.jp --- sound/firewire/dice/dice_pcm.c | 109 +++++++++++++++++++++++++---------------- 1 file changed, 66 insertions(+), 43 deletions(-)
diff --git a/sound/firewire/dice/dice_pcm.c b/sound/firewire/dice/dice_pcm.c index 3905959..6473676 100644 --- a/sound/firewire/dice/dice_pcm.c +++ b/sound/firewire/dice/dice_pcm.c @@ -67,69 +67,92 @@ static int dice_channels_constraint(struct snd_pcm_hw_params *params, return snd_interval_refine(c, &channels); }
- -static int pcm_open(struct snd_pcm_substream *substream) +static void limit_channels_and_rates(struct snd_dice *dice, + struct snd_pcm_runtime *runtime, + unsigned int *pcm_channels) { - static const struct snd_pcm_hardware hardware = { - .info = SNDRV_PCM_INFO_MMAP | - SNDRV_PCM_INFO_MMAP_VALID | - SNDRV_PCM_INFO_BATCH | - SNDRV_PCM_INFO_INTERLEAVED | - SNDRV_PCM_INFO_BLOCK_TRANSFER, - .formats = AMDTP_OUT_PCM_FORMAT_BITS, - .channels_min = UINT_MAX, - .channels_max = 0, - .buffer_bytes_max = 16 * 1024 * 1024, - .period_bytes_min = 1, - .period_bytes_max = UINT_MAX, - .periods_min = 1, - .periods_max = UINT_MAX, - }; - struct snd_dice *dice = substream->private_data; - struct snd_pcm_runtime *runtime = substream->runtime; - unsigned int i; - int err; + struct snd_pcm_hardware *hw = &runtime->hw; + unsigned int i, rate, mode;
- err = snd_dice_stream_lock_try(dice); - if (err < 0) - goto error; + hw->channels_min = UINT_MAX; + hw->channels_max = 0; + + for (i = 0; i < ARRAY_SIZE(snd_dice_rates); ++i) { + rate = snd_dice_rates[i]; + if (snd_dice_stream_get_rate_mode(dice, rate, &mode) < 0) + continue; + hw->rates |= snd_pcm_rate_to_rate_bit(rate);
- runtime->hw = hardware; + if (pcm_channels[mode] == 0) + continue; + hw->channels_min = min(hw->channels_min, pcm_channels[mode]); + hw->channels_max = max(hw->channels_max, pcm_channels[mode]); + }
- for (i = 0; i < ARRAY_SIZE(snd_dice_rates); ++i) - if (dice->clock_caps & (1 << i)) - runtime->hw.rates |= - snd_pcm_rate_to_rate_bit(snd_dice_rates[i]); snd_pcm_limit_hw_rates(runtime); +}
- for (i = 0; i < 3; ++i) - if (dice->rx_channels[i]) { - runtime->hw.channels_min = min(runtime->hw.channels_min, - dice->rx_channels[i]); - runtime->hw.channels_max = max(runtime->hw.channels_max, - dice->rx_channels[i]); - } +static void limit_period_and_buffer(struct snd_pcm_hardware *hw) +{ + hw->periods_min = 2; /* SNDRV_PCM_INFO_BATCH */ + hw->periods_max = UINT_MAX; + + hw->period_bytes_min = 4 * hw->channels_max; /* byte for a frame */ + + /* Just to prevent from allocating much pages. */ + hw->period_bytes_max = hw->period_bytes_min * 2048; + hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min; +} + +static int init_hw_info(struct snd_dice *dice, + struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct snd_pcm_hardware *hw = &runtime->hw; + int err; + + hw->info = SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_MMAP_VALID | + SNDRV_PCM_INFO_BATCH | + SNDRV_PCM_INFO_INTERLEAVED | + SNDRV_PCM_INFO_BLOCK_TRANSFER; + hw->formats = AMDTP_OUT_PCM_FORMAT_BITS; + + limit_channels_and_rates(dice, runtime, dice->rx_channels); + limit_period_and_buffer(hw);
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, dice_rate_constraint, dice, SNDRV_PCM_HW_PARAM_CHANNELS, -1); if (err < 0) - goto err_lock; + goto end; err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, dice_channels_constraint, dice, SNDRV_PCM_HW_PARAM_RATE, -1); if (err < 0) - goto err_lock; + goto end;
err = amdtp_stream_add_pcm_hw_constraints(&dice->rx_stream, runtime); - if (err < 0) - goto err_lock; +end: + return err; +}
- return 0; +static int pcm_open(struct snd_pcm_substream *substream) +{ + struct snd_dice *dice = substream->private_data; + int err;
-err_lock: + err = snd_dice_stream_lock_try(dice); + if (err < 0) + goto end; + + err = init_hw_info(dice, substream); + if (err < 0) + goto err_locked; +end: + return err; +err_locked: snd_dice_stream_lock_release(dice); -error: return err; }