linux-kernel - [PATCH 1/9] ASoC: mcasp: Fix implicit BLCK divider setting

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Date:	Wed, 6 Aug 2014 16:47:16 +0300
From:	Jyri Sarha <jsarha@...com>
To:	<linux-kernel@...r.kernel.org>, <mturquette@...aro.org>,
	<dri-devel@...ts.freedesktop.org>, <airlied@...ux.ie>,
	<linux-omap@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<bcousson@...libre.com>
CC:	<tony@...mide.com>, <broonie@...nel.org>,
	<liam.r.girdwood@...ux.intel.com>, <peter.ujfalusi@...com>,
	<detheridge@...com>, <zonque@...il.com>, <t-kristo@...com>,
	Jyri Sarha <jsarha@...com>
Subject: [PATCH 1/9] ASoC: mcasp: Fix implicit BLCK divider setting

The implicit BLCK divider setting was broken by "ASoC: mcasp: don't
override bclk divider if it was provided by the machine"-patch. After
the BCLK divider is implicitly set for the first time the
mcasp->bclk_div gets a non zero value and the implicit setting is
"turned off".

Signed-off-by: Jyri Sarha <jsarha@...com>
---
 sound/soc/davinci/davinci-mcasp.c |   14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c
index c28508d..6a6b2ff 100644
--- a/sound/soc/davinci/davinci-mcasp.c
+++ b/sound/soc/davinci/davinci-mcasp.c
@@ -403,7 +403,8 @@ out:
 	return ret;
 }
 
-static int davinci_mcasp_set_clkdiv(struct snd_soc_dai *dai, int div_id, int div)
+static int __davinci_mcasp_set_clkdiv(struct snd_soc_dai *dai, int div_id,
+				      int div, bool explicit)
 {
 	struct davinci_mcasp *mcasp = snd_soc_dai_get_drvdata(dai);
 
@@ -420,7 +421,8 @@ static int davinci_mcasp_set_clkdiv(struct snd_soc_dai *dai, int div_id, int div
 			       ACLKXDIV(div - 1), ACLKXDIV_MASK);
 		mcasp_mod_bits(mcasp, DAVINCI_MCASP_ACLKRCTL_REG,
 			       ACLKRDIV(div - 1), ACLKRDIV_MASK);
-		mcasp->bclk_div = div;
+		if (explicit)
+			mcasp->bclk_div = div;
 		break;
 
 	case 2:		/* BCLK/LRCLK ratio */
@@ -434,6 +436,12 @@ static int davinci_mcasp_set_clkdiv(struct snd_soc_dai *dai, int div_id, int div
 	return 0;
 }
 
+static int davinci_mcasp_set_clkdiv(struct snd_soc_dai *dai, int div_id,
+				    int div)
+{
+	return __davinci_mcasp_set_clkdiv(dai, div_id, div, 1);
+}
+
 static int davinci_mcasp_set_sysclk(struct snd_soc_dai *dai, int clk_id,
 				    unsigned int freq, int dir)
 {
@@ -738,7 +746,7 @@ static int davinci_mcasp_hw_params(struct snd_pcm_substream *substream,
 				 "Inaccurate BCLK: %u Hz / %u != %u Hz\n",
 				 mcasp->sysclk_freq, div, bclk_freq);
 		}
-		davinci_mcasp_set_clkdiv(cpu_dai, 1, div);
+		__davinci_mcasp_set_clkdiv(cpu_dai, 1, div, 0);
 	}
 
 	ret = mcasp_common_hw_param(mcasp, substream->stream,
-- 
1.7.9.5

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