diff options
| author | Dong Aisheng <dong.aisheng@linaro.org> | 2012-07-20 17:20:24 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-07-24 20:17:58 +0100 |
| commit | c2e1d9073fc98f471067c0257a31b4818306ebe1 (patch) | |
| tree | 2f7a0a5020881a9e4bc4413f60849bed279c9d08 /sound | |
| parent | b8edf3e5522735c8ce78b81845f7a1a2d4a08626 (diff) | |
| download | linux-c2e1d9073fc98f471067c0257a31b4818306ebe1.tar.gz linux-c2e1d9073fc98f471067c0257a31b4818306ebe1.tar.xz | |
ASoC: mxs-saif: fix clock prepare and enable unbalance issue
Currently we directly call a clock_enable in trigger function without
a clk_prepare as pair first.
This will cause system hang immediately when run capture because
the clock was not prepared(playback does not hang because the clock was
prepared already by get_mclk before), a warning message in clock framework
may cause a deadlock to reclaim clock lock (see: pl011_console_write).
Here we prepare clock first in hw_param, then enable it in trigger
function to guarantee the balance.
Signed-off-by: Dong Aisheng <dong.aisheng@linaro.org>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/soc/mxs/mxs-saif.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/sound/soc/mxs/mxs-saif.c b/sound/soc/mxs/mxs-saif.c index aba71bfa33b1..fdbb36aa9cf5 100644 --- a/sound/soc/mxs/mxs-saif.c +++ b/sound/soc/mxs/mxs-saif.c @@ -394,9 +394,14 @@ static int mxs_saif_hw_params(struct snd_pcm_substream *substream, struct snd_soc_dai *cpu_dai) { struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai); + struct mxs_saif *master_saif; u32 scr, stat; int ret; + master_saif = mxs_saif_get_master(saif); + if (!master_saif) + return -EINVAL; + /* mclk should already be set */ if (!saif->mclk && saif->mclk_in_use) { dev_err(cpu_dai->dev, "set mclk first\n"); @@ -420,6 +425,11 @@ static int mxs_saif_hw_params(struct snd_pcm_substream *substream, return ret; } + /* prepare clk in hw_param, enable in trigger */ + clk_prepare(saif->clk); + if (saif != master_saif) + clk_prepare(master_saif->clk); + scr = __raw_readl(saif->base + SAIF_CTRL); scr &= ~BM_SAIF_CTRL_WORD_LENGTH; |