ASoC: Intel: bytcr_rt5640: enable differential mic quirk

Some Baytrail-CR devices rely on analog mics connected with
differential pairs and not the single-ended default
Add quirk and enable it for T00TAF

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 8 insertions, 1 deletions

diff --git a/sound/soc/intel/boards/bytcr_rt5640.c b/sound/soc/intel/boards/bytcr_rt5640.c
index 421a53cfa53f..085e57f95fb2 100644
--- a/sound/soc/intel/boards/bytcr_rt5640.c
+++ b/sound/soc/intel/boards/bytcr_rt5640.c
@@ -41,6 +41,7 @@ enum {
 #define BYT_RT5640_MAP(quirk)   ((quirk) & 0xff)
 #define BYT_RT5640_DMIC_EN      BIT(16)
 #define BYT_RT5640_MONO_SPEAKER BIT(17)
+#define BYT_RT5640_DIFF_MIC     BIT(18) /* defaut is single-ended */
 
 static unsigned long byt_rt5640_quirk = BYT_RT5640_DMIC1_MAP |
                                         BYT_RT5640_DMIC_EN;
@@ -148,7 +149,8 @@ static const struct dmi_system_id byt_rt5640_quirk_table[] = {
                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100TAF"),
                 },
                 .driver_data = (unsigned long *)(BYT_RT5640_IN1_MAP |
-                                                 BYT_RT5640_MONO_SPEAKER
+                                                 BYT_RT5640_MONO_SPEAKER |
+                                                 BYT_RT5640_DIFF_MIC
                                                  ),
         },
         {
@@ -223,6 +225,11 @@ static int byt_rt5640_init(struct snd_soc_pcm_runtime *runtime)
         if (ret)
                 return ret;
 
+        if (byt_rt5640_quirk & BYT_RT5640_DIFF_MIC) {
+                snd_soc_update_bits(codec,  RT5640_IN1_IN2, RT5640_IN_DF1,
+                                    RT5640_IN_DF1);
+        }
+
         if (byt_rt5640_quirk & BYT_RT5640_DMIC_EN) {
                 ret = rt5640_dmic_enable(codec, 0, 0);
                 if (ret)