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authorDong Aisheng <dong.aisheng@linaro.org>2012-07-20 17:20:24 +0800
committerMark Brown <broonie@opensource.wolfsonmicro.com>2012-07-24 20:17:58 +0100
commitc2e1d9073fc98f471067c0257a31b4818306ebe1 (patch)
tree2f7a0a5020881a9e4bc4413f60849bed279c9d08 /sound
parentb8edf3e5522735c8ce78b81845f7a1a2d4a08626 (diff)
downloadblackbird-op-linux-c2e1d9073fc98f471067c0257a31b4818306ebe1.tar.gz
blackbird-op-linux-c2e1d9073fc98f471067c0257a31b4818306ebe1.zip
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.c10
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;
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