ASoC: da7219: Reset codec gracefully, if still active

Currently the reset code in i2c_probe only resets the AAD part of
the device and not the entire codec. This patch updates the driver
to resolve this and ensures that if the codec is still active from
a previous boot then the audio paths are powered down prior to
reset.

Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/codecs/da7219.c b/sound/soc/codecs/da7219.c
index 9d08c11b6f14f1a55a56ce9bc2b8bd64ef67d7ac..eecb6d6c29cf13b064965a30f17ccc46abab257b 100644 (file)
--- a/sound/soc/codecs/da7219.c
+++ b/sound/soc/codecs/da7219.c
@@ -1925,7 +1925,8 @@ static int da7219_i2c_probe(struct i2c_client *i2c,
                            const struct i2c_device_id *id)
 {
        struct da7219_priv *da7219;
-       int ret;
+       unsigned int system_active, system_status;
+       int i, ret;
 
        da7219 = devm_kzalloc(&i2c->dev, sizeof(struct da7219_priv),
                              GFP_KERNEL);
@@ -1941,14 +1942,37 @@ static int da7219_i2c_probe(struct i2c_client *i2c,
                return ret;
        }
 
-       /* Software reset codec. */
+       regcache_cache_bypass(da7219->regmap, true);
+
+       /* Disable audio paths if still active from previous start */
+       regmap_read(da7219->regmap, DA7219_SYSTEM_ACTIVE, &system_active);
+       if (system_active) {
+               regmap_write(da7219->regmap, DA7219_GAIN_RAMP_CTRL,
+                            DA7219_GAIN_RAMP_RATE_NOMINAL);
+               regmap_write(da7219->regmap, DA7219_SYSTEM_MODES_INPUT, 0x00);
+               regmap_write(da7219->regmap, DA7219_SYSTEM_MODES_OUTPUT, 0x01);
+
+               for (i = 0; i < DA7219_SYS_STAT_CHECK_RETRIES; ++i) {
+                       regmap_read(da7219->regmap, DA7219_SYSTEM_STATUS,
+                                   &system_status);
+                       if (!system_status)
+                               break;
+
+                       msleep(DA7219_SYS_STAT_CHECK_DELAY);
+               }
+       }
+
+       /* Soft reset codec */
        regmap_write_bits(da7219->regmap, DA7219_ACCDET_CONFIG_1,
                          DA7219_ACCDET_EN_MASK, 0);
        regmap_write_bits(da7219->regmap, DA7219_CIF_CTRL,
-                         DA7219_CIF_REG_SOFT_RESET_MASK, 0);
+                         DA7219_CIF_REG_SOFT_RESET_MASK,
+                         DA7219_CIF_REG_SOFT_RESET_MASK);
        regmap_write_bits(da7219->regmap, DA7219_SYSTEM_ACTIVE,
                          DA7219_SYSTEM_ACTIVE_MASK, 0);
 
+       regcache_cache_bypass(da7219->regmap, false);
+
        ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_da7219,
                                     &da7219_dai, 1);
        if (ret < 0) {

diff --git a/sound/soc/codecs/da7219.h b/sound/soc/codecs/da7219.h
index 545576ddf50c85d34f2d8c28dc9482d5bc0f5222..f1b3ad835270dd706d5cdf243bb6c5afa485c2e4 100644 (file)
--- a/sound/soc/codecs/da7219.h
+++ b/sound/soc/codecs/da7219.h
@@ -578,6 +578,7 @@
 #define DA7219_GAIN_RAMP_RATE_SHIFT    0
 #define DA7219_GAIN_RAMP_RATE_MASK     (0x3 << 0)
 #define DA7219_GAIN_RAMP_RATE_X8       (0x0 << 0)
+#define DA7219_GAIN_RAMP_RATE_NOMINAL  (0x1 << 0)
 #define DA7219_GAIN_RAMP_RATE_MAX      4
 
 /* DA7219_PC_COUNT = 0x94 */
@@ -772,6 +773,10 @@
 /* SRM */
 #define DA7219_SRM_CHECK_RETRIES       8
 
+/* System Controller */
+#define DA7219_SYS_STAT_CHECK_RETRIES  6
+#define DA7219_SYS_STAT_CHECK_DELAY    50
+
 enum da7219_clk_src {
        DA7219_CLKSRC_MCLK = 0,
        DA7219_CLKSRC_MCLK_SQR,