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From:   Olivier Moysan <olivier.moysan@st.com>
To:     <lgirdwood@gmail.com>, <broonie@kernel.org>, <perex@perex.cz>,
        <tiwai@suse.com>, <mcoquelin.stm32@gmail.com>,
        <alexandre.torgue@st.com>, <alsa-devel@alsa-project.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-stm32@st-md-mailman.stormreply.com>,
        <linux-kernel@vger.kernel.org>, <olivier.moysan@st.com>,
        <arnaud.pouliquen@st.com>, <benjamin.gaignard@st.com>
Subject: [PATCH 4/5] ASoC: stm32: sai: fix oversampling mode
Date:   Thu, 28 Feb 2019 14:19:24 +0100
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Set OSR bit if mclk/fs ratio is 512.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
---
 sound/soc/stm/stm32_sai_sub.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c
index cad415e03b5e..cb658463ccd1 100644
--- a/sound/soc/stm/stm32_sai_sub.c
+++ b/sound/soc/stm/stm32_sai_sub.c
@@ -913,7 +913,7 @@ static int stm32_sai_configure_clock(struct snd_soc_dai *cpu_dai,
 				     struct snd_pcm_hw_params *params)
 {
 	struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
-	int div = 0;
+	int div = 0, cr1 = 0;
 	int sai_clk_rate, mclk_ratio, den;
 	unsigned int rate = params_rate(params);
 
@@ -958,13 +958,19 @@ static int stm32_sai_configure_clock(struct snd_soc_dai *cpu_dai,
 		} else {
 			if (sai->mclk_rate) {
 				mclk_ratio = sai->mclk_rate / rate;
-				if ((mclk_ratio != 512) &&
-				    (mclk_ratio != 256)) {
+				if (mclk_ratio == 512) {
+					cr1 = SAI_XCR1_OSR;
+				} else if (mclk_ratio != 256) {
 					dev_err(cpu_dai->dev,
 						"Wrong mclk ratio %d\n",
 						mclk_ratio);
 					return -EINVAL;
 				}
+
+				regmap_update_bits(sai->regmap,
+						   STM_SAI_CR1_REGX,
+						   SAI_XCR1_OSR, cr1);
+
 				div = stm32_sai_get_clk_div(sai, sai_clk_rate,
 							    sai->mclk_rate);
 				if (div < 0)
-- 
2.7.4