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>
diff --git a/sound/pci/als4000.c b/sound/pci/als4000.c
index 6cf1de8..036a9ba 100644
--- a/sound/pci/als4000.c
+++ b/sound/pci/als4000.c
@@ -763,9 +763,9 @@
/* 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);
}