From: Sascha Hauer s.hauer@pengutronix.de
Enable baudclk only when it is used. The baudclock is only needed in master mode and only when thr driver is active, so move enabling to fsl_ssi_startup and disabling to fsl_ssi_shutdown.
Signed-off-by: Sascha Hauer s.hauer@pengutronix.de --- sound/soc/fsl/fsl_ssi.c | 37 ++++++++++++++++++++++++++++++------- 1 file changed, 30 insertions(+), 7 deletions(-)
diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c index f2255cb..d6d3f0a3 100644 --- a/sound/soc/fsl/fsl_ssi.c +++ b/sound/soc/fsl/fsl_ssi.c @@ -236,6 +236,12 @@ static bool fsl_ssi_is_ac97(struct fsl_ssi_private *ssi_private) return !!(ssi_private->dai_fmt & SND_SOC_DAIFMT_AC97); }
+static bool fsl_ssi_is_i2s_master(struct fsl_ssi_private *ssi_private) +{ + return (ssi_private->dai_fmt & SND_SOC_DAIFMT_MASTER_MASK) == + SND_SOC_DAIFMT_CBS_CFS; +} + /** * fsl_ssi_isr: SSI interrupt handler * @@ -489,6 +495,7 @@ static int fsl_ssi_startup(struct snd_pcm_substream *substream, struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(rtd->cpu_dai); unsigned long flags; + int ret;
if (!dai->active && !fsl_ssi_is_ac97(ssi_private)) { spin_lock_irqsave(&ssi_private->baudclk_lock, flags); @@ -496,6 +503,12 @@ static int fsl_ssi_startup(struct snd_pcm_substream *substream, spin_unlock_irqrestore(&ssi_private->baudclk_lock, flags); }
+ if (fsl_ssi_is_i2s_master(ssi_private)) { + ret = clk_prepare_enable(ssi_private->baudclk); + if (ret) + return ret; + } + /* When using dual fifo mode, it is safer to ensure an even period * size. If appearing to an odd number while DMA always starts its * task from fifo0, fifo1 would be neglected at the end of each @@ -508,6 +521,17 @@ static int fsl_ssi_startup(struct snd_pcm_substream *substream, return 0; }
+static void fsl_ssi_shutdown(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct fsl_ssi_private *ssi_private = + snd_soc_dai_get_drvdata(rtd->cpu_dai); + + if (fsl_ssi_is_i2s_master(ssi_private)) + clk_disable_unprepare(ssi_private->baudclk); +} + /** * fsl_ssi_hw_params - program the sample size * @@ -576,6 +600,11 @@ static int fsl_ssi_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
ssi_private->dai_fmt = fmt;
+ if (fsl_ssi_is_i2s_master(ssi_private) && IS_ERR(ssi_private->baudclk)) { + dev_err(cpu_dai->dev, "no baudclk needed for master mode\n"); + return -EINVAL; + } + fsl_ssi_setup_reg_vals(ssi_private);
scr = read_ssi(&ssi->scr) & ~(CCSR_SSI_SCR_SYN | CCSR_SSI_SCR_I2S_MODE_MASK); @@ -910,6 +939,7 @@ static int fsl_ssi_dai_probe(struct snd_soc_dai *dai)
static const struct snd_soc_dai_ops fsl_ssi_dai_ops = { .startup = fsl_ssi_startup, + .shutdown = fsl_ssi_shutdown, .hw_params = fsl_ssi_hw_params, .set_fmt = fsl_ssi_set_dai_fmt, .set_sysclk = fsl_ssi_set_dai_sysclk, @@ -1050,8 +1080,6 @@ static int fsl_ssi_imx_probe(struct platform_device *pdev, if (IS_ERR(ssi_private->baudclk)) dev_dbg(&pdev->dev, "could not get baud clock: %ld\n", PTR_ERR(ssi_private->baudclk)); - else - clk_prepare_enable(ssi_private->baudclk);
/* * We have burstsize be "fifo_depth - 2" to match the SSI @@ -1102,9 +1130,6 @@ static int fsl_ssi_imx_probe(struct platform_device *pdev, return 0;
error_pcm: - if (!IS_ERR(ssi_private->baudclk)) - clk_disable_unprepare(ssi_private->baudclk); - clk_disable_unprepare(ssi_private->clk);
return ret; @@ -1115,8 +1140,6 @@ static void fsl_ssi_imx_clean(struct platform_device *pdev, { if (!ssi_private->use_dma) imx_pcm_fiq_exit(pdev); - if (!IS_ERR(ssi_private->baudclk)) - clk_disable_unprepare(ssi_private->baudclk); clk_disable_unprepare(ssi_private->clk); }