---------------------
PatchSet 3104 
Date: 2005/04/10 00:00:24
Author: jcdutton
Branch: HEAD
Tag: (none) 
Log:
Summary: Improve playback startup. Increase buffer size, and reduce xruns.

Members: 
	pci/emu10k1/p16v.c:1.4->1.5 

Index: /sound/pci/emu10k1/p16v.c
diff -u /sound/pci/emu10k1/p16v.c.old /sound/pci/emu10k1/p16v.c
--- /sound/pci/emu10k1/p16v.c.old	Sat Apr  9 15:38:25 2005
+++ /sound/pci/emu10k1/p16v.c	Sat Apr  9 16:00:24 2005
@@ -124,9 +124,9 @@
 	.rate_max =		192000,
 	.channels_min =		8, 
 	.channels_max =		8,
-	.buffer_bytes_max =	(32*1024),
+	.buffer_bytes_max =	((65536 - 64) * 8),
 	.period_bytes_min =	64,
-	.period_bytes_max =	(16*1024),
+	.period_bytes_max =	(65536 - 64),
 	.periods_min =		2,
 	.periods_max =		8,
 	.fifo_size =		0,
@@ -347,7 +347,8 @@
 	snd_emu10k1_ptr20_write(emu, PLAYBACK_LIST_SIZE, channel, (runtime->periods - 1) << 19);
 	snd_emu10k1_ptr20_write(emu, PLAYBACK_LIST_PTR, channel, 0);
 	snd_emu10k1_ptr20_write(emu, PLAYBACK_DMA_ADDR, channel, runtime->dma_addr);
-	snd_emu10k1_ptr20_write(emu, PLAYBACK_PERIOD_SIZE, channel, frames_to_bytes(runtime, runtime->period_size)<<16); // buffer size in bytes
+	//snd_emu10k1_ptr20_write(emu, PLAYBACK_PERIOD_SIZE, channel, frames_to_bytes(runtime, runtime->period_size)<<16); // buffer size in bytes
+	snd_emu10k1_ptr20_write(emu, PLAYBACK_PERIOD_SIZE, channel, 0); // buffer size in bytes
 	snd_emu10k1_ptr20_write(emu, PLAYBACK_POINTER, channel, 0);
 	snd_emu10k1_ptr20_write(emu, 0x07, channel, 0x0);
 	snd_emu10k1_ptr20_write(emu, 0x08, channel, 0);
@@ -602,7 +603,7 @@
 		if ((err = snd_pcm_lib_preallocate_pages(substream, 
 							 SNDRV_DMA_TYPE_DEV, 
 							 snd_dma_pci_data(emu->pci), 
-							 64*1024, 64*1024)) < 0) /* FIXME: 32*1024 for sound buffer, between 32and64 for Periods table. */
+							 ((65536 - 64) * 8), ((65536 - 64) * 8))) < 0) 
 			return err;
 		//snd_printk("preallocate playback substream: err=%d\n", err);
 	}