From c2e1d9073fc98f471067c0257a31b4818306ebe1 Mon Sep 17 00:00:00 2001 From: Dong Aisheng Date: Fri, 20 Jul 2012 17:20:24 +0800 Subject: 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 Acked-by: Shawn Guo Signed-off-by: Mark Brown --- sound/soc/mxs/mxs-saif.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'sound/soc/mxs/mxs-saif.c') 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; -- cgit From d0ba4c014934cb56f1eabb481ff8026b6d49d33c Mon Sep 17 00:00:00 2001 From: Dong Aisheng Date: Fri, 20 Jul 2012 17:20:25 +0800 Subject: ASoC: mxs-saif: set a base clock rate for EXTMASTER mode work Set an initial clock rate for the saif internal logic to work properly. This is important when working in EXTMASTER mode that uses the other saif's BITCLK&LRCLK but it still needs a basic clock which should be fast enough for the internal logic. Signed-off-by: Dong Aisheng Acked-by: Shawn Guo Signed-off-by: Mark Brown --- sound/soc/mxs/mxs-saif.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) (limited to 'sound/soc/mxs/mxs-saif.c') diff --git a/sound/soc/mxs/mxs-saif.c b/sound/soc/mxs/mxs-saif.c index fdbb36aa9cf5..b3030718c228 100644 --- a/sound/soc/mxs/mxs-saif.c +++ b/sound/soc/mxs/mxs-saif.c @@ -427,8 +427,22 @@ static int mxs_saif_hw_params(struct snd_pcm_substream *substream, /* prepare clk in hw_param, enable in trigger */ clk_prepare(saif->clk); - if (saif != master_saif) + if (saif != master_saif) { + /* + * Set an initial clock rate for the saif internal logic to work + * properly. This is important when working in EXTMASTER mode + * that uses the other saif's BITCLK&LRCLK but it still needs a + * basic clock which should be fast enough for the internal + * logic. + */ + clk_enable(saif->clk); + ret = clk_set_rate(saif->clk, 24000000); + clk_disable(saif->clk); + if (ret) + return ret; + clk_prepare(master_saif->clk); + } scr = __raw_readl(saif->base + SAIF_CTRL); -- cgit