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| author | Takashi Iwai <tiwai@suse.de> | 2011-07-12 19:27:46 +0400 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2011-07-12 19:31:46 +0400 |
| commit | acfa634f7e199193ec28282e82a5a6dd8edebcb7 (patch) | |
| tree | 49193fcf5bb5c21f61d1ff7d8a7e404ce4e774ad | |
| parent | 30b4503378c976cf66201a1e81820519f6bd79ac (diff) | |
| download | linux-acfa634f7e199193ec28282e82a5a6dd8edebcb7.tar.xz | |
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>
| -rw-r--r-- | sound/pci/hda/Kconfig | 13 | ||||
| -rw-r--r-- | sound/pci/hda/hda_intel.c | 8 |
2 files changed, 20 insertions, 1 deletions
diff --git a/sound/pci/hda/Kconfig b/sound/pci/hda/Kconfig index 70762fca57ee..1f1a4ae4b791 100644 --- a/sound/pci/hda/Kconfig +++ b/sound/pci/hda/Kconfig @@ -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 diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index 25619cd18831..5ce9531cba67 100644 --- a/sound/pci/hda/hda_intel.c +++ b/sound/pci/hda/hda_intel.c @@ -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; } |