ALSA: hda - Add Kconfig for the default buffer size
Add a Kconfig entry to specify the default buffer size. Distros using PulseAudio can choose a larger value here. Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -14,6 +14,19 @@ menuconfig SND_HDA_INTEL
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if SND_HDA_INTEL
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config SND_HDA_PREALLOC_SIZE
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int "Pre-allocated buffer size for HD-audio driver"
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range 0 32768
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default 64
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help
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Speficies the default pre-allocated buffer-size in kB for
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HD-audio driver. A larger buffer (e.g. 2048) is preferred
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for systems with PulseAudio. The default 64 is chosen just
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from the compatibility reason.
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Note that the pre-allocation size can be changed dynamically
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via a proc file (/proc/asound/card*/pcm*/sub*/prealloc), too.
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config SND_HDA_HWDEP
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bool "Build hwdep interface for HD-audio driver"
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select SND_HWDEP
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@ -2075,6 +2075,8 @@ static void azx_pcm_free(struct snd_pcm *pcm)
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}
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}
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#define MAX_PREALLOC_SIZE (32 * 1024 * 1024)
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static int
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azx_attach_pcm_stream(struct hda_bus *bus, struct hda_codec *codec,
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struct hda_pcm *cpcm)
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@ -2083,6 +2085,7 @@ azx_attach_pcm_stream(struct hda_bus *bus, struct hda_codec *codec,
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struct snd_pcm *pcm;
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struct azx_pcm *apcm;
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int pcm_dev = cpcm->device;
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unsigned int size;
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int s, err;
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if (pcm_dev >= HDA_MAX_PCMS) {
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@ -2118,9 +2121,12 @@ azx_attach_pcm_stream(struct hda_bus *bus, struct hda_codec *codec,
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snd_pcm_set_ops(pcm, s, &azx_pcm_ops);
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}
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/* buffer pre-allocation */
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size = CONFIG_SND_HDA_PREALLOC_SIZE * 1024;
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if (size > MAX_PREALLOC_SIZE)
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size = MAX_PREALLOC_SIZE;
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snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
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snd_dma_pci_data(chip->pci),
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1024 * 64, 32 * 1024 * 1024);
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size, MAX_PREALLOC_SIZE);
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return 0;
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}
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