[alsa-devel] [PATCH V2] ASoC - Add support for upto 16 channels on OMAP MCBSP

[Jarkko Nikula]

On Thu, 05 Nov 2009 21:00:08 +0000
Liam Girdwood <lrg at slimlogic.co.uk> wrote:

> From: Graeme Gregory <gg at slimlogic.co.uk>
> 
> This patch increases the number of supported audio channels from 4
> to 16 and has been sponsored by Shotspotter Inc. It also fixes a
> FSYNC rate calculation bug when McBSP is FSYNC master.
> 
I would not call it as bug but more like an implementation
restriction :-)

But as the patch now requires that machine driver using OMAP as a
master must provide the sample rate generator input clock frequency, I
would like to hear how it will work on Pandora.

Grazvydas: are you able to test is the Pandora still playing after applying
patch [1] to omap-mcbsp.c and my patch below to omap3pandora.c?

I made an assumption that input clock frequency on Pandora is
8 * 32 * sample_rate.

-- 
Jarkko

1.
http://mailman.alsa-project.org/pipermail/alsa-devel/2009-November/022797.html

---
diff --git a/sound/soc/omap/omap3pandora.c b/sound/soc/omap/omap3pandora.c
index ad219aa..d0949fe 100644
--- a/sound/soc/omap/omap3pandora.c
+++ b/sound/soc/omap/omap3pandora.c
@@ -40,9 +40,12 @@
 
 #define PREFIX "ASoC omap3pandora: "
 
-static int omap3pandora_cmn_hw_params(struct snd_soc_dai *codec_dai,
-	struct snd_soc_dai *cpu_dai, unsigned int fmt)
+static int omap3pandora_cmn_hw_params(struct snd_pcm_substream *substream,
+	struct snd_pcm_hw_params *params, unsigned int fmt)
 {
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
+	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
 	int ret;
 
 	/* Set codec DAI configuration */
@@ -68,8 +71,9 @@ static int omap3pandora_cmn_hw_params(struct snd_soc_dai *codec_dai,
 	}
 
 	/* Set McBSP clock to external */
-	ret = snd_soc_dai_set_sysclk(cpu_dai, OMAP_MCBSP_SYSCLK_CLKS_EXT, 0,
-					    SND_SOC_CLOCK_IN);
+	ret = snd_soc_dai_set_sysclk(cpu_dai, OMAP_MCBSP_SYSCLK_CLKS_EXT,
+				     8 * 32 * params_rate(params),
+				     SND_SOC_CLOCK_IN);
 	if (ret < 0) {
 		pr_err(PREFIX "can't set cpu system clock\n");
 		return ret;
@@ -87,11 +91,7 @@ static int omap3pandora_cmn_hw_params(struct snd_soc_dai *codec_dai,
 static int omap3pandora_out_hw_params(struct snd_pcm_substream *substream,
 	struct snd_pcm_hw_params *params)
 {
-	struct snd_soc_pcm_runtime *rtd = substream->private_data;
-	struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
-	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
-
-	return omap3pandora_cmn_hw_params(codec_dai, cpu_dai,
+	return omap3pandora_cmn_hw_params(substream, params,
 					  SND_SOC_DAIFMT_I2S |
 					  SND_SOC_DAIFMT_IB_NF |
 					  SND_SOC_DAIFMT_CBS_CFS);
@@ -100,11 +100,7 @@ static int omap3pandora_out_hw_params(struct snd_pcm_substream *substream,
 static int omap3pandora_in_hw_params(struct snd_pcm_substream *substream,
 	struct snd_pcm_hw_params *params)
 {
-	struct snd_soc_pcm_runtime *rtd = substream->private_data;
-	struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
-	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
-
-	return omap3pandora_cmn_hw_params(codec_dai, cpu_dai,
+	return omap3pandora_cmn_hw_params(substream, params,
 					  SND_SOC_DAIFMT_I2S |
 					  SND_SOC_DAIFMT_NB_NF |
 					  SND_SOC_DAIFMT_CBS_CFS);