diff options
| author | Troy Kisky <troy.kisky@boundarydevices.com> | 2009-07-04 19:29:55 -0700 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2009-07-05 12:59:07 +0100 |
| commit | 1bef449989d0866a7db366a8153135cfa3d5cad9 (patch) | |
| tree | 39a96450614a7dc5d7e6a729b112eba3a4b12bd2 /sound/soc/davinci | |
| parent | eba575c30b93755dc0ee5e9adbb5b06d3289b62a (diff) | |
| download | op-kernel-dev-1bef449989d0866a7db366a8153135cfa3d5cad9.zip op-kernel-dev-1bef449989d0866a7db366a8153135cfa3d5cad9.tar.gz | |
ASoC: DaVinci: i2s, only start sample generator if needed
Only start sample generator if needed, and more
cleanup on davinci_mcbsp_start.
Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'sound/soc/davinci')
| -rw-r--r-- | sound/soc/davinci/davinci-i2s.c | 32 |
1 files changed, 14 insertions, 18 deletions
diff --git a/sound/soc/davinci/davinci-i2s.c b/sound/soc/davinci/davinci-i2s.c index 73a0fd8..4260965 100644 --- a/sound/soc/davinci/davinci-i2s.c +++ b/sound/soc/davinci/davinci-i2s.c @@ -146,11 +146,14 @@ static void davinci_mcbsp_start(struct davinci_mcbsp_dev *dev, spcr & ~mask); toggle_clock(dev, playback); } - /* Start the sample generator and enable transmitter/receiver */ - spcr |= DAVINCI_MCBSP_SPCR_GRST; - davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr); + if (dev->pcr & (DAVINCI_MCBSP_PCR_FSXM | DAVINCI_MCBSP_PCR_FSRM | + DAVINCI_MCBSP_PCR_CLKXM | DAVINCI_MCBSP_PCR_CLKRM)) { + /* Start the sample generator */ + spcr |= DAVINCI_MCBSP_SPCR_GRST; + davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr); + } - if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { + if (playback) { /* Stop the DMA to avoid data loss */ /* while the transmitter is out of reset to handle XSYNCERR */ if (platform->pcm_ops->trigger) { @@ -181,23 +184,16 @@ static void davinci_mcbsp_start(struct davinci_mcbsp_dev *dev, if (ret < 0) printk(KERN_DEBUG "Playback DMA start failed\n"); } - /* Enable the transmitter */ - spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG); - spcr |= DAVINCI_MCBSP_SPCR_XRST; - davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr); - - } else { - - /* Enable the reciever */ - spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG); - spcr |= DAVINCI_MCBSP_SPCR_RRST; - davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr); } - - /* Start frame sync */ + /* Enable transmitter or receiver */ spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG); - spcr |= DAVINCI_MCBSP_SPCR_FRST; + spcr |= mask; + + if (dev->pcr & (DAVINCI_MCBSP_PCR_FSXM | DAVINCI_MCBSP_PCR_FSRM)) { + /* Start frame sync */ + spcr |= DAVINCI_MCBSP_SPCR_FRST; + } davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr); } |
