Commit b9619230 authored by Ondrej Zary's avatar Ondrej Zary Committed by Takashi Iwai

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: default avatarOndrej Zary <linux@rainbow-software.org>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent dd2f8c2f
...@@ -763,9 +763,9 @@ static void snd_als4000_configure(struct snd_sb *chip) ...@@ -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);
} }
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment