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ALSA: als4000: enable burst mode

Enable burst mode to prevent dropouts during high PCI bus usage.
The card is useless in X without this because of dropouts when anything moves
on the screen (at least with PCI VGA card). Enabling this is also recommended
by the datasheet (page 48).

Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Ondrej Zary 15 years ago
parent
dd2f8c2f81
commit
b9619230e1
1 changed files with 2 additions and 2 deletions
Unified View Show Diff Stats
  1. 2 2
      sound/pci/als4000.c

+ 2 - 2
sound/pci/als4000.c
View File 

@@ -763,9 +763,9 @@ static void snd_als4000_configure(struct snd_sb *chip)
 
 	/* SPECS_PAGE: 39 */
 
 	/* SPECS_PAGE: 39 */
 
 	for (i = ALS4K_GCR91_DMA0_ADDR; i <= ALS4K_GCR96_DMA3_MODE_COUNT; ++i)
 
 	for (i = ALS4K_GCR91_DMA0_ADDR; i <= ALS4K_GCR96_DMA3_MODE_COUNT; ++i)
 
 		snd_als4k_gcr_write(chip, i, 0);
 
 		snd_als4k_gcr_write(chip, i, 0);
 
-	
+	/* enable burst mode to prevent dropouts during high PCI bus usage */
 
 	snd_als4k_gcr_write(chip, ALS4K_GCR99_DMA_EMULATION_CTRL,
 
 	snd_als4k_gcr_write(chip, ALS4K_GCR99_DMA_EMULATION_CTRL,
 
-		snd_als4k_gcr_read(chip, ALS4K_GCR99_DMA_EMULATION_CTRL));
 
+		snd_als4k_gcr_read(chip, ALS4K_GCR99_DMA_EMULATION_CTRL) | 0x04);
 
 	spin_unlock_irq(&chip->reg_lock);
 
 	spin_unlock_irq(&chip->reg_lock);
 
 }
 
 }