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ALSA: hda - Add Kconfig for the default buffer size

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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>
This commit is contained in:
Takashi Iwai 2011-07-12 17:27:46 +02:00
parent 30b4503378
commit acfa634f7e
2 changed files with 20 additions and 1 deletions
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13
sound/pci/hda/Kconfig
View file

@ -14,6 +14,19 @@ menuconfig SND_HDA_INTEL
if SND_HDA_INTEL
config SND_HDA_PREALLOC_SIZE
int "Pre-allocated buffer size for HD-audio driver"
range 0 32768
default 64
help
Speficies the default pre-allocated buffer-size in kB for
HD-audio driver. A larger buffer (e.g. 2048) is preferred
for systems with PulseAudio. The default 64 is chosen just
from the compatibility reason.
Note that the pre-allocation size can be changed dynamically
via a proc file (/proc/asound/card*/pcm*/sub*/prealloc), too.
config SND_HDA_HWDEP
bool "Build hwdep interface for HD-audio driver"
select SND_HWDEP

8
sound/pci/hda/hda_intel.c
View file

@ -2075,6 +2075,8 @@ static void azx_pcm_free(struct snd_pcm *pcm)
}
}
#define MAX_PREALLOC_SIZE (32 * 1024 * 1024)
static int
azx_attach_pcm_stream(struct hda_bus *bus, struct hda_codec *codec,
struct hda_pcm *cpcm)
@ -2083,6 +2085,7 @@ azx_attach_pcm_stream(struct hda_bus *bus, struct hda_codec *codec,
struct snd_pcm *pcm;
struct azx_pcm *apcm;
int pcm_dev = cpcm->device;
unsigned int size;
int s, err;
if (pcm_dev >= HDA_MAX_PCMS) {
@ -2118,9 +2121,12 @@ azx_attach_pcm_stream(struct hda_bus *bus, struct hda_codec *codec,
snd_pcm_set_ops(pcm, s, &azx_pcm_ops);
}
/* buffer pre-allocation */
size = CONFIG_SND_HDA_PREALLOC_SIZE * 1024;
if (size > MAX_PREALLOC_SIZE)
size = MAX_PREALLOC_SIZE;
snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
snd_dma_pci_data(chip->pci),
1024 * 64, 32 * 1024 * 1024);
size, MAX_PREALLOC_SIZE);
return 0;
}