summaryrefslogtreecommitdiff
path: root/sound/soc/fsl/fsl_ssi.c
diff options
context:
space:
mode:
authorSascha Hauer <s.hauer@pengutronix.de>2014-05-27 10:24:20 +0200
committerMark Brown <broonie@linaro.org>2014-06-01 11:55:07 +0100
commit8dd51e23a1ef3b5f22eeff4827260b75bafba620 (patch)
tree62754178efdd7c78ddb93aa5dc9f9ceb748e97cb /sound/soc/fsl/fsl_ssi.c
parent85e59af24056ca7ffaf617cf6201c519e31dc668 (diff)
downloadkernel-8dd51e23a1ef3b5f22eeff4827260b75bafba620.tar.gz
ASoC: fsl-ssi: set bitclock in master mode from hw_params
The fsl_ssi driver uses the .set_sysclk callback to configure the bitclock for master mode. This is unnecessary since the bitclock is known in hw_params. This patch configures the bitclock from .hw_params. .set_dai_sysclk now sets a bitclock frequency which is preferred over the default calculated bitclock frequency. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Markus Pargmann <mpa@pengutronix.de> Tested-By: Michael Grzeschik <mgr@pengutronix.de> Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'sound/soc/fsl/fsl_ssi.c')
-rw-r--r--sound/soc/fsl/fsl_ssi.c40
1 files changed, 36 insertions, 4 deletions
diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c
index 18eacf5e399d..930095b1b72a 100644
--- a/sound/soc/fsl/fsl_ssi.c
+++ b/sound/soc/fsl/fsl_ssi.c
@@ -166,6 +166,7 @@ struct fsl_ssi_private {
spinlock_t baudclk_lock;
struct clk *baudclk;
struct clk *clk;
+ unsigned int bitclk_freq;
struct snd_dmaengine_dai_dma_data dma_params_tx;
struct snd_dmaengine_dai_dma_data dma_params_rx;
struct imx_pcm_fiq_params fiq_params;
@@ -236,6 +237,12 @@ 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
*
@@ -509,7 +516,7 @@ static int fsl_ssi_startup(struct snd_pcm_substream *substream,
}
/**
- * fsl_ssi_set_dai_sysclk - configure Digital Audio Interface bit clock
+ * fsl_ssi_set_bclk - configure Digital Audio Interface bit clock
*
* Note: This function can be only called when using SSI as DAI master
*
@@ -517,8 +524,9 @@ static int fsl_ssi_startup(struct snd_pcm_substream *substream,
* freq: Output BCLK frequency = samplerate * 32 (fixed) * channels
* dir: SND_SOC_CLOCK_OUT -> TxBCLK, SND_SOC_CLOCK_IN -> RxBCLK.
*/
-static int fsl_ssi_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
- int clk_id, unsigned int freq, int dir)
+static int fsl_ssi_set_bclk(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *cpu_dai,
+ struct snd_pcm_hw_params *hw_params)
{
struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(cpu_dai);
struct ccsr_ssi __iomem *ssi = ssi_private->ssi;
@@ -526,6 +534,13 @@ static int fsl_ssi_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
u32 pm = 999, div2, psr, stccr, mask, afreq, factor, i;
unsigned long flags, clkrate, baudrate, tmprate;
u64 sub, savesub = 100000;
+ unsigned int freq;
+
+ /* Prefer the explicitly set bitclock frequency */
+ if (ssi_private->bitclk_freq)
+ freq = ssi_private->bitclk_freq;
+ else
+ freq = params_channels(hw_params) * 32 * params_rate(hw_params);
/* Don't apply it to any non-baudclk circumstance */
if (IS_ERR(ssi_private->baudclk))
@@ -583,7 +598,7 @@ static int fsl_ssi_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
mask = CCSR_SSI_SxCCR_PM_MASK | CCSR_SSI_SxCCR_DIV2 |
CCSR_SSI_SxCCR_PSR;
- if (dir == SND_SOC_CLOCK_OUT || synchronous)
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK || synchronous)
write_ssi_mask(&ssi->stccr, mask, stccr);
else
write_ssi_mask(&ssi->srccr, mask, stccr);
@@ -604,6 +619,16 @@ static int fsl_ssi_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
return 0;
}
+static int fsl_ssi_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
+ int clk_id, unsigned int freq, int dir)
+{
+ struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(cpu_dai);
+
+ ssi_private->bitclk_freq = freq;
+
+ return 0;
+}
+
/**
* fsl_ssi_hw_params - program the sample size
*
@@ -627,6 +652,7 @@ static int fsl_ssi_hw_params(struct snd_pcm_substream *substream,
snd_pcm_format_width(params_format(hw_params));
u32 wl = CCSR_SSI_SxCCR_WL(sample_size);
int enabled = read_ssi(&ssi->scr) & CCSR_SSI_SCR_SSIEN;
+ int ret;
/*
* If we're in synchronous mode, and the SSI is already enabled,
@@ -635,6 +661,12 @@ static int fsl_ssi_hw_params(struct snd_pcm_substream *substream,
if (enabled && ssi_private->cpu_dai_drv.symmetric_rates)
return 0;
+ if (fsl_ssi_is_i2s_master(ssi_private)) {
+ ret = fsl_ssi_set_bclk(substream, cpu_dai, hw_params);
+ if (ret)
+ return ret;
+ }
+
/*
* FIXME: The documentation says that SxCCR[WL] should not be
* modified while the SSI is enabled. The only time this can