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| author | Nicolin Chen <nicoleotsuka@gmail.com> | 2015-02-10 21:31:43 -0800 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2015-02-11 13:46:07 +0800 |
| commit | 541b03ad6cfe0e415273f096fd8c47d2879c6c15 (patch) | |
| tree | 6ae8ed723cc29ece6e2b75dda72cc8bd3592c32c /sound | |
| parent | bfa76d49576599a4b9f9b7a71f23d73d6dcff735 (diff) | |
| download | linux-541b03ad6cfe0e415273f096fd8c47d2879c6c15.tar.gz linux-541b03ad6cfe0e415273f096fd8c47d2879c6c15.tar.bz2 linux-541b03ad6cfe0e415273f096fd8c47d2879c6c15.zip | |
ASoC: fsl_ssi: Fix the incorrect limitation of the bit clock rate
According to i.MX Reference Manual, the bit-clock frequency generated
by SSI must be never greater than 1/5 of the peripheral clock frequency.
This peripheral clock, however, is not baudclk but the IPG clock (i.e.
ssi_private->clk in the fsl_ssi driver).
So this patch just simply fixes the incorrect limitation applied to
the bit clock (baudclk) rate.
Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/soc/fsl/fsl_ssi.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c index 059496ed9ad7..d7365c5d7ec0 100644 --- a/sound/soc/fsl/fsl_ssi.c +++ b/sound/soc/fsl/fsl_ssi.c @@ -603,10 +603,6 @@ static int fsl_ssi_set_bclk(struct snd_pcm_substream *substream, factor = (div2 + 1) * (7 * psr + 1) * 2; for (i = 0; i < 255; i++) { - /* The bclk rate must be smaller than 1/5 sysclk rate */ - if (factor * (i + 1) < 5) - continue; - tmprate = freq * factor * (i + 2); if (baudclk_is_used) @@ -614,6 +610,13 @@ static int fsl_ssi_set_bclk(struct snd_pcm_substream *substream, else clkrate = clk_round_rate(ssi_private->baudclk, tmprate); + /* + * Hardware limitation: The bclk rate must be + * never greater than 1/5 IPG clock rate + */ + if (clkrate * 5 > clk_get_rate(ssi_private->clk)) + continue; + clkrate /= factor; afreq = clkrate / (i + 1); |