diff options
| author | Matthias Reichl <hias@horus.com> | 2016-04-25 15:39:39 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2016-04-25 18:39:11 +0200 |
| commit | 60507fe191f524e82986fa737e5b27b4d3ad9289 (patch) | |
| tree | bfb9078671aab182021ec44baa8044b418ec00f9 /sound/soc/bcm | |
| parent | ASoC: bcm2835: add 24bit support (diff) | |
| download | linux-60507fe191f524e82986fa737e5b27b4d3ad9289.tar.xz linux-60507fe191f524e82986fa737e5b27b4d3ad9289.zip | |
ASoC: bcm2835: setup clock only if CPU is clock master
We only need to enable the clock if we are a clock master.
Code ported from bcm2708-i2s driver in Raspberry Pi tree.
Original work by Zoltan Szenczi.
Signed-off-by: Matthias Reichl <hias@horus.com>
Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/bcm')
| -rw-r--r-- | sound/soc/bcm/bcm2835-i2s.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/sound/soc/bcm/bcm2835-i2s.c b/sound/soc/bcm/bcm2835-i2s.c index d2663e79ece1..a0026e2d2f0a 100644 --- a/sound/soc/bcm/bcm2835-i2s.c +++ b/sound/soc/bcm/bcm2835-i2s.c @@ -276,8 +276,15 @@ static int bcm2835_i2s_hw_params(struct snd_pcm_substream *substream, /* otherwise calculate a fitting block ratio */ bclk_ratio = 2 * data_length; - /* set target clock rate*/ - clk_set_rate(dev->clk, sampling_rate * bclk_ratio); + /* Clock should only be set up here if CPU is clock master */ + switch (dev->fmt & SND_SOC_DAIFMT_MASTER_MASK) { + case SND_SOC_DAIFMT_CBS_CFS: + case SND_SOC_DAIFMT_CBS_CFM: + clk_set_rate(dev->clk, sampling_rate * bclk_ratio); + break; + default: + break; + } /* Setup the frame format */ format = BCM2835_I2S_CHEN; |