devel/kernel/hda_intel-prealloc-4mb-dmabuffer.patch

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index c8d9178..7d3bb15 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -1774,6 +1774,7 @@ 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\n",
@@ -1807,10 +1808,21 @@ 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	diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
2	index c8d9178..7d3bb15 100644
3	--- a/sound/pci/hda/hda_intel.c
4	+++ b/sound/pci/hda/hda_intel.c
5	@@ -1774,6 +1774,7 @@ azx_attach_pcm_stream(struct hda_bus bus, struct hda_codec codec,
6	struct azx_pcm *apcm;
7	int pcm_dev = cpcm->device;
8	int s, err;
9	+ size_t prealloc_min = 641024; / 64KB */
10
11	if (pcm_dev >= AZX_MAX_PCMS) {
12	snd_printk(KERN_ERR SFX "Invalid PCM device number %d\n",
13	@@ -1807,10 +1808,21 @@ azx_attach_pcm_stream(struct hda_bus bus, struct hda_codec codec,
14	if (cpcm->stream[s].substreams)
15	snd_pcm_set_ops(pcm, s, &azx_pcm_ops);
16	}
17	+
18	/* buffer pre-allocation */
19	+
20	+ /* subtle, don't allocate a big buffer for modems...
21	+ * also, don't just test 32BIT_MASK, since azx supports
22	+ * 64-bit DMA in some cases.
23	+ */
24	+ /* lennart wants a 2.2MB buffer for 2sec of 48khz */
25	+ if (pcm->dev_class == SNDRV_PCM_CLASS_GENERIC &&
26	+ chip->pci->dma_mask >= DMA_32BIT_MASK)
27	+ prealloc_min = 4 * 1024 * 1024; /* 4MB */
28	+
29	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
30	snd_dma_pci_data(chip->pci),
31	- 1024 * 64, 32 * 1024 * 1024);
32	+ prealloc_min, 32 * 1024 * 1024);
33	return 0;
34	}
35
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