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Old 12-09-2009, 11:45 PM
Brad Figg
 
Default UBUNTU: SAUCE: Increase the default prealloc buffer for HDA audio devices (non-modem)

This allows for buffering of up to 4 seconds of audio. This is
intended to improve the audio experience. This patch is being
carried by Fedora but is not upstream.

Signed-off-by: Brad Figg <brad.figg@canonical.com>
---
sound/pci/hda/hda_intel.c | 14 +++++++++++++-
1 files changed, 13 insertions(+), 1 deletions(-)

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 6517f58..3f02c70 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -1944,6 +1944,7 @@ azx_attach_pcm_stream(struct hda_bus *bus, struct hda_codec *codec,
struct azx_pcm *apcm;
int pcm_dev = cpcm->device;
int s, err;
+ size_t prealloc_min = 64*1024; /* 64KB */

if (pcm_dev >= AZX_MAX_PCMS) {
snd_printk(KERN_ERR SFX "Invalid PCM device number %d
",
@@ -1977,10 +1978,21 @@ azx_attach_pcm_stream(struct hda_bus *bus, struct hda_codec *codec,
if (cpcm->stream[s].substreams)
snd_pcm_set_ops(pcm, s, &azx_pcm_ops);
}
+
/* buffer pre-allocation */
+
+ /* subtle, don't allocate a big buffer for modems...
+ * also, don't just test 32BIT_MASK, since azx supports
+ * 64-bit DMA in some cases.
+ */
+ /* lennart wants a 2.2MB buffer for 2sec of 48khz */
+ if (pcm->dev_class == SNDRV_PCM_CLASS_GENERIC &&
+ chip->pci->dma_mask >= DMA_32BIT_MASK)
+ prealloc_min = 4 * 1024 * 1024; /* 4MB */
+
snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
snd_dma_pci_data(chip->pci),
- 1024 * 64, 32 * 1024 * 1024);
+ prealloc_min, 32 * 1024 * 1024);
return 0;
}

--
1.6.4.4


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