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From c69fcbd1f60b0842f7c1ad2c95692ffd19c4932b Mon Sep 17 00:00:00 2001
From: Kyle McMartin <kyle@phobos.i.jkkm.org>
Date: Mon, 29 Mar 2010 23:56:08 -0400
Subject: hda_intel-prealloc-4mb-dmabuffer
---
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 4bb9067..37db515 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -1986,6 +1986,7 @@ 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 >= HDA_MAX_PCMS) {
snd_printk(KERN_ERR SFX "Invalid PCM device number %d\n",
@@ -2019,10 +2020,21 @@ 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;
}
--
1.7.0.1
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