[PATCH 1/4] ASoC: cs35l35: Add Boost Inductor Calculation

Charles Keepax
2017-05-18T15:32:36Z

From: Brian Austin <brian.austin@cirrus.com>

Add the Boost Inductor parameters based off the size of the inductor
on the HW setup

Signed-off-by: Brian Austin <brian.austin@cirrus.com>
Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
---
include/sound/cs35l35.h | 2 ++
sound/soc/codecs/cs35l35.c | 82 ++++++++++++++++++++++++++++++++++++++++++++++
sound/soc/codecs/cs35l35.h | 6 ++++
3 files changed, 90 insertions(+)

diff --git a/include/sound/cs35l35.h b/include/sound/cs35l35.h
index 29da899..d69cd78 100644
--- a/include/sound/cs35l35.h
+++ b/include/sound/cs35l35.h
@@ -99,6 +99,8 @@ struct cs35l35_platform_data {
bool shared_bst;
/* Specifies this amp is using an external boost supply */
bool ext_bst;
+ /* Inductor Value */
+ int boost_ind;
/* ClassH Algorithm */
struct classh_cfg classh_algo;
/* Monitor Config */
diff --git a/sound/soc/codecs/cs35l35.c b/sound/soc/codecs/cs35l35.c
index f8aef58..c6eabb8 100644
--- a/sound/soc/codecs/cs35l35.c
+++ b/sound/soc/codecs/cs35l35.c
@@ -756,6 +756,76 @@ static int cs35l35_codec_set_sysclk(struct snd_soc_codec *codec,
return ret;
}

+static int cs35l35_boost_inductor(struct cs35l35_private *cs35l35,
+ int inductor)
+{
+ struct regmap *regmap = cs35l35->regmap;
+ unsigned int bst_ipk = 0;
+
+ /*
+ * Digital Boost Converter Configuration for feedback,
+ * ramping, switching frequency, and estimation block seeding.
+ */
+
+ regmap_update_bits(regmap, CS35L35_BST_CONV_SW_FREQ,
+ CS35L35_BST_CONV_SWFREQ_MASK, 0x00);
+
+ regmap_read(regmap, CS35L35_BST_PEAK_I, &bst_ipk);
+ bst_ipk &= CS35L35_BST_IPK_MASK;
+
+ switch (inductor) {
+ case 1000: /* 1 uH */
+ regmap_write(regmap, CS35L35_BST_CONV_COEF_1, 0x24);
+ regmap_write(regmap, CS35L35_BST_CONV_COEF_2, 0x24);
+ regmap_update_bits(regmap, CS35L35_BST_CONV_SW_FREQ,
+ CS35L35_BST_CONV_LBST_MASK, 0x00);
+
+ if (bst_ipk < 0x04)
+ regmap_write(regmap, CS35L35_BST_CONV_SLOPE_COMP, 0x1B);
+ else
+ regmap_write(regmap, CS35L35_BST_CONV_SLOPE_COMP, 0x4E);
+ break;
+ case 1200: /* 1.2 uH */
+ regmap_write(regmap, CS35L35_BST_CONV_COEF_1, 0x20);
+ regmap_write(regmap, CS35L35_BST_CONV_COEF_2, 0x20);
+ regmap_update_bits(regmap, CS35L35_BST_CONV_SW_FREQ,
+ CS35L35_BST_CONV_LBST_MASK, 0x01);
+
+ if (bst_ipk < 0x04)
+ regmap_write(regmap, CS35L35_BST_CONV_SLOPE_COMP, 0x1B);
+ else
+ regmap_write(regmap, CS35L35_BST_CONV_SLOPE_COMP, 0x47);
+ break;
+ case 1500: /* 1.5uH */
+ regmap_write(regmap, CS35L35_BST_CONV_COEF_1, 0x20);
+ regmap_write(regmap, CS35L35_BST_CONV_COEF_2, 0x20);
+ regmap_update_bits(regmap, CS35L35_BST_CONV_SW_FREQ,
+ CS35L35_BST_CONV_LBST_MASK, 0x02);
+
+ if (bst_ipk < 0x04)
+ regmap_write(regmap, CS35L35_BST_CONV_SLOPE_COMP, 0x1B);
+ else
+ regmap_write(regmap, CS35L35_BST_CONV_SLOPE_COMP, 0x3C);
+ break;
+ case 2200: /* 2.2uH */
+ regmap_write(regmap, CS35L35_BST_CONV_COEF_1, 0x19);
+ regmap_write(regmap, CS35L35_BST_CONV_COEF_2, 0x25);
+ regmap_update_bits(regmap, CS35L35_BST_CONV_SW_FREQ,
+ CS35L35_BST_CONV_LBST_MASK, 0x03);
+
+ if (bst_ipk < 0x04)
+ regmap_write(regmap, CS35L35_BST_CONV_SLOPE_COMP, 0x1B);
+ else
+ regmap_write(regmap, CS35L35_BST_CONV_SLOPE_COMP, 0x23);
+ break;
+ default:
+ dev_err(cs35l35->dev, "Invalid Inductor Value %d uH\n",
+ inductor);
+ return -EINVAL;
+ }
+ return 0;
+}
+
static int cs35l35_codec_probe(struct snd_soc_codec *codec)
{
struct cs35l35_private *cs35l35 = snd_soc_codec_get_drvdata(codec);
@@ -775,6 +845,10 @@ static int cs35l35_codec_probe(struct snd_soc_codec *codec)
cs35l35->pdata.bst_ipk <<
CS35L35_BST_IPK_SHIFT);

+ ret = cs35l35_boost_inductor(cs35l35, cs35l35->pdata.boost_ind);
+ if (ret)
+ return ret;
+
if (cs35l35->pdata.gain_zc)
regmap_update_bits(cs35l35->regmap, CS35L35_PROTECT_CTL,
CS35L35_AMP_GAIN_ZC_MASK,
@@ -1198,6 +1272,14 @@ static int cs35l35_handle_of_data(struct i2c_client *i2c_client,
pdata->bst_ipk = (val32 - 1680) / 110;
}

+ ret = of_property_read_u32(np, "cirrus,boost-ind-nanohenry", &val32);
+ if (ret >= 0) {
+ pdata->boost_ind = val32;
+ } else {
+ dev_err(&i2c_client->dev, "Inductor not specified.\n");
+ return -EINVAL;
+ }
+
if (of_property_read_u32(np, "cirrus,sp-drv-strength", &val32) >= 0)
pdata->sp_drv_str = val32;
if (of_property_read_u32(np, "cirrus,sp-drv-unused", &val32) >= 0)
diff --git a/sound/soc/codecs/cs35l35.h b/sound/soc/codecs/cs35l35.h
index 5a6e43a..621bfef 100644
--- a/sound/soc/codecs/cs35l35.h
+++ b/sound/soc/codecs/cs35l35.h
@@ -200,6 +200,12 @@
#define CS35L35_SP_I2S_DRV_MASK 0x03
#define CS35L35_SP_I2S_DRV_SHIFT 0

+/* Boost Converter Config */
+#define CS35L35_BST_CONV_COEFF_MASK 0xFF
+#define CS35L35_BST_CONV_SLOPE_MASK 0xFF
+#define CS35L35_BST_CONV_LBST_MASK 0x03
+#define CS35L35_BST_CONV_SWFREQ_MASK 0xF0
+
/* Class H Algorithm Control */
#define CS35L35_CH_STEREO_MASK 0x40
#define CS35L35_CH_STEREO_SHIFT 6
--
2.1.4