[PATCH 4/5] ASoC: stm32: sai: fix oversampling mode

[Olivier Moysan]

Set OSR bit if mclk/fs ratio is 512.

Signed-off-by: Olivier Moysan <olivier.moy...@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