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[ALSA] oxygen: add symbols for buffer/period size constraints
Introduce symbols for the buffer/period size constraints so that their limits and relationships become clearer. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Jaroslav Kysela <perex@perex.cz>
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1 changed files with 30 additions and 16 deletions
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@ -24,6 +24,16 @@
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#include <sound/pcm_params.h>
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#include "oxygen.h"
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/* most DMA channels have a 16-bit counter for 32-bit words */
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#define BUFFER_BYTES_MAX ((1 << 16) * 4)
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/* the multichannel DMA channel has a 24-bit counter */
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#define BUFFER_BYTES_MAX_MULTICH ((1 << 24) * 4)
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#define PERIOD_BYTES_MIN 64
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#define DEFAULT_BUFFER_BYTES (BUFFER_BYTES_MAX / 2)
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#define DEFAULT_BUFFER_BYTES_MULTICH (1024 * 1024)
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static const struct snd_pcm_hardware oxygen_stereo_hardware = {
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.info = SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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@ -44,11 +54,11 @@ static const struct snd_pcm_hardware oxygen_stereo_hardware = {
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.rate_max = 192000,
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.channels_min = 2,
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.channels_max = 2,
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.buffer_bytes_max = 256 * 1024,
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.period_bytes_min = 128,
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.period_bytes_max = 128 * 1024,
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.buffer_bytes_max = BUFFER_BYTES_MAX,
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.period_bytes_min = PERIOD_BYTES_MIN,
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.period_bytes_max = BUFFER_BYTES_MAX / 2,
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.periods_min = 2,
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.periods_max = 2048,
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.periods_max = BUFFER_BYTES_MAX / PERIOD_BYTES_MIN,
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};
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static const struct snd_pcm_hardware oxygen_multichannel_hardware = {
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.info = SNDRV_PCM_INFO_MMAP |
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@ -70,11 +80,11 @@ static const struct snd_pcm_hardware oxygen_multichannel_hardware = {
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.rate_max = 192000,
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.channels_min = 2,
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.channels_max = 8,
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.buffer_bytes_max = 2048 * 1024,
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.period_bytes_min = 128,
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.period_bytes_max = 256 * 1024,
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.buffer_bytes_max = BUFFER_BYTES_MAX_MULTICH,
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.period_bytes_min = PERIOD_BYTES_MIN,
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.period_bytes_max = BUFFER_BYTES_MAX_MULTICH / 2,
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.periods_min = 2,
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.periods_max = 16384,
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.periods_max = BUFFER_BYTES_MAX_MULTICH / PERIOD_BYTES_MIN,
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};
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static const struct snd_pcm_hardware oxygen_ac97_hardware = {
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.info = SNDRV_PCM_INFO_MMAP |
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@ -88,11 +98,11 @@ static const struct snd_pcm_hardware oxygen_ac97_hardware = {
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.rate_max = 48000,
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.channels_min = 2,
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.channels_max = 2,
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.buffer_bytes_max = 256 * 1024,
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.period_bytes_min = 128,
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.period_bytes_max = 128 * 1024,
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.buffer_bytes_max = BUFFER_BYTES_MAX,
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.period_bytes_min = PERIOD_BYTES_MIN,
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.period_bytes_max = BUFFER_BYTES_MAX / 2,
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.periods_min = 2,
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.periods_max = 2048,
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.periods_max = BUFFER_BYTES_MAX / PERIOD_BYTES_MIN,
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};
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static const struct snd_pcm_hardware *const oxygen_hardware[PCM_COUNT] = {
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@ -664,12 +674,14 @@ int oxygen_pcm_init(struct oxygen *chip)
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snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream,
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SNDRV_DMA_TYPE_DEV,
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snd_dma_pci_data(chip->pci),
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512 * 1024, 2048 * 1024);
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DEFAULT_BUFFER_BYTES_MULTICH,
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BUFFER_BYTES_MAX_MULTICH);
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if (ins)
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snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream,
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SNDRV_DMA_TYPE_DEV,
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snd_dma_pci_data(chip->pci),
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128 * 1024, 256 * 1024);
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DEFAULT_BUFFER_BYTES,
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BUFFER_BYTES_MAX);
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}
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outs = !!(chip->model->pcm_dev_cfg & PLAYBACK_1_TO_SPDIF);
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@ -689,7 +701,8 @@ int oxygen_pcm_init(struct oxygen *chip)
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strcpy(pcm->name, "Digital");
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snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
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snd_dma_pci_data(chip->pci),
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128 * 1024, 256 * 1024);
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DEFAULT_BUFFER_BYTES,
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BUFFER_BYTES_MAX);
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}
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if (chip->has_ac97_1) {
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@ -719,7 +732,8 @@ int oxygen_pcm_init(struct oxygen *chip)
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strcpy(pcm->name, outs ? "Front Panel" : "Analog 2");
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snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
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snd_dma_pci_data(chip->pci),
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128 * 1024, 256 * 1024);
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DEFAULT_BUFFER_BYTES,
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BUFFER_BYTES_MAX);
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}
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return 0;
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}
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