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authorAndrew Jackson <Andrew.Jackson@arm.com>2014-12-19 16:18:06 +0000
committerMark Brown <broonie@kernel.org>2014-12-22 15:06:03 +0000
commitdb2c1f9e38a38e0f9294b5a8a83d744f68fbe726 (patch)
tree04b6376bee6cb7c3e210023f14614731a9e1a5b3 /sound/soc
parent3475c3d034d7f276a474c8bd53f44b48c8bf669d (diff)
downloadlinux-db2c1f9e38a38e0f9294b5a8a83d744f68fbe726.tar.bz2
ASoC: dwc: Iterate over all channels
The Designware core can be configured with up to four stereo channels. Each stereo channel is individually configured so, when the driver's hw_params call is made, each requested stereo channel has to be programmed. Signed-off-by: Andrew Jackson <Andrew.Jackson@arm.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc')
-rw-r--r--sound/soc/dwc/designware_i2s.c35
1 files changed, 16 insertions, 19 deletions
diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c
index 4df19b57429c..8d18bbda661b 100644
--- a/sound/soc/dwc/designware_i2s.c
+++ b/sound/soc/dwc/designware_i2s.c
@@ -209,16 +209,9 @@ static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
switch (config->chan_nr) {
case EIGHT_CHANNEL_SUPPORT:
- ch_reg = 3;
- break;
case SIX_CHANNEL_SUPPORT:
- ch_reg = 2;
- break;
case FOUR_CHANNEL_SUPPORT:
- ch_reg = 1;
- break;
case TWO_CHANNEL_SUPPORT:
- ch_reg = 0;
break;
default:
dev_err(dev->dev, "channel not supported\n");
@@ -227,18 +220,22 @@ static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
i2s_disable_channels(dev, substream->stream);
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
- i2s_write_reg(dev->i2s_base, TCR(ch_reg), xfer_resolution);
- i2s_write_reg(dev->i2s_base, TFCR(ch_reg), 0x02);
- irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
- 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, RCR(ch_reg), xfer_resolution);
- i2s_write_reg(dev->i2s_base, RFCR(ch_reg), 0x07);
- irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
- i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x03);
- i2s_write_reg(dev->i2s_base, RER(ch_reg), 1);
+ for (ch_reg = 0; ch_reg < (config->chan_nr / 2); ch_reg++) {
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ i2s_write_reg(dev->i2s_base, TCR(ch_reg),
+ xfer_resolution);
+ i2s_write_reg(dev->i2s_base, TFCR(ch_reg), 0x02);
+ irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
+ 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, RCR(ch_reg),
+ xfer_resolution);
+ i2s_write_reg(dev->i2s_base, RFCR(ch_reg), 0x07);
+ irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
+ i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x03);
+ i2s_write_reg(dev->i2s_base, RER(ch_reg), 1);
+ }
}
i2s_write_reg(dev->i2s_base, CCR, ccr);