From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ondrej Zary Subject: als4000: enable burst mode Date: Tue, 3 Aug 2010 23:57:05 +0200 Message-ID: <201008032357.06661.linux@rainbow-software.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail.atlantis.sk (mail1-out1.atlantis.sk [80.94.52.55]) by alsa0.perex.cz (Postfix) with ESMTP id 831DB24463 for ; Tue, 3 Aug 2010 23:57:15 +0200 (CEST) Content-Disposition: inline List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@alsa-project.org Errors-To: alsa-devel-bounces@alsa-project.org To: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org 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-2.6.35-rc2/sound/pci/als4000.c 2010-06-06 05:43:24.000000000 +0200 +++ linux-2.6.35-rc3/sound/pci/als4000.c 2010-08-03 23:50:08.000000000 +0200 @@ -763,9 +763,9 @@ static void snd_als4000_configure(struct /* 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); } -- Ondrej Zary