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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>
This commit is contained in:
Ondrej Zary 2010-08-03 23:57:05 +02:00 committed by Takashi Iwai
parent dd2f8c2f81
commit b9619230e1
1 changed files with 2 additions and 2 deletions
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4
sound/pci/als4000.c
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@ -763,9 +763,9 @@ static void snd_als4000_configure(struct snd_sb *chip)
/* SPECS_PAGE: 39 */
for (i = ALS4K_GCR91_DMA0_ADDR; i <= ALS4K_GCR96_DMA3_MODE_COUNT; ++i)
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_read(chip, ALS4K_GCR99_DMA_EMULATION_CTRL));
snd_als4k_gcr_read(chip, ALS4K_GCR99_DMA_EMULATION_CTRL) | 0x04);
spin_unlock_irq(&chip->reg_lock);
}