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ASoC: davinci-mcasp: Allow best effort in selecting BCLK divider 

Do not fail if the exact BLCK rate can not be produced, just print a
warning. Check that sysclk frequency is set before implicitly setting
the BCLK divider.

Signed-off-by: Jyri Sarha <jsarha@ti.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Jyri Sarha 2014-06-13 12:50:00 +03:00 committed by Mark Brown
parent 6479285d8a
commit 0929878f93
1 changed files with 9 additions and 5 deletions
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14
sound/soc/davinci/davinci-mcasp.c
View File

@ -721,14 +721,18 @@ static int davinci_mcasp_hw_params(struct snd_pcm_substream *substream,
int ret;
/* If mcasp is BCLK master we need to set BCLK divider */
if (mcasp->bclk_master) {
if (mcasp->bclk_master && mcasp->sysclk_freq) {
unsigned int bclk_freq = snd_soc_params_to_bclk(params);
unsigned int div = mcasp->sysclk_freq / bclk_freq;
if (mcasp->sysclk_freq % bclk_freq != 0) {
dev_err(mcasp->dev, "Can't produce required BCLK\n");
return -EINVAL;
if (((mcasp->sysclk_freq / div) - bclk_freq) >
(bclk_freq - (mcasp->sysclk_freq / (div+1))))
div++;
dev_warn(mcasp->dev,
"Inaccurate BCLK: %u Hz / %u != %u Hz\n",
mcasp->sysclk_freq, div, bclk_freq);
}
davinci_mcasp_set_clkdiv(
cpu_dai, 1, mcasp->sysclk_freq / bclk_freq);
davinci_mcasp_set_clkdiv(cpu_dai, 1, div);
}
ret = mcasp_common_hw_param(mcasp, substream->stream,