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Commit b9619230 authored by Ondrej Zary's avatar Ondrej Zary Committed by Takashi Iwai
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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: default avatarOndrej Zary <linux@rainbow-software.org>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent dd2f8c2f

sound/pci/als4000.c

+2 −2
Original line number Diff line number Diff line
@@ -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);

}