Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752851AbaLCQjs (ORCPT ); Wed, 3 Dec 2014 11:39:48 -0500 Received: from fw-tnat.cambridge.arm.com ([217.140.96.140]:45310 "EHLO cam-smtp0.cambridge.arm.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752502AbaLCQjn (ORCPT ); Wed, 3 Dec 2014 11:39:43 -0500 Message-ID: <547F3CB2.5070306@arm.com> Date: Wed, 03 Dec 2014 16:39:14 +0000 From: Andrew Jackson User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.3.0 MIME-Version: 1.0 To: Jaroslav Kysela , Takashi Iwai CC: "alsa-devel@alsa-project.org" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , Rajeev Kumar , Liam Girdwood , Mark Brown , Liviu Dudau Subject: [PATCH 5/5] ASoC: dwc: Ensure FIFOs are flushed to prevent channel swap Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If the FIFOs aren't flushed, the left/right channels may be swapped: this may occur if the FIFOs are not empty when the streams start. Signed-off-by: Andrew Jackson --- sound/soc/dwc/designware_i2s.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c index 083779d..932abfd 100644 --- a/sound/soc/dwc/designware_i2s.c +++ b/sound/soc/dwc/designware_i2s.c @@ -258,6 +258,7 @@ static int dw_i2s_hw_params(struct snd_pcm_substream *substream, /* Iterate over set of channels - independently controlled. */ do { if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { + i2s_write_reg(dev->i2s_base, TXFFR, 1); i2s_write_reg(dev->i2s_base, TCR(ch_reg), xfer_resolution); i2s_write_reg(dev->i2s_base, TFCR(ch_reg), 0x02); @@ -265,6 +266,7 @@ static int dw_i2s_hw_params(struct snd_pcm_substream *substream, i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x30); i2s_write_reg(dev->i2s_base, TER(ch_reg), 1); } else { + i2s_write_reg(dev->i2s_base, RXFFR, 1); i2s_write_reg(dev->i2s_base, RCR(ch_reg), xfer_resolution); i2s_write_reg(dev->i2s_base, RFCR(ch_reg), 0x07); -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/