TLV320AIC3107 on an i.MX6QP (EDM1-IMX6PLUS)

slav_slavov — Mon, 03 Jul 2017 11:38:09 GMT

Our HW team decided to use the TI Audio Codec TLV320AIC3107 on one of the boards (utilizing EDM1-IMX6PLUS module from TechNexion) mainly because of the Class D amplifier. I tried to use the /sound/soc/codecs/tlv320aic3x.c codec and the /sound/soc/fsl/imx-tlv320aic3x.c machine driver. In the DTS file, the codec was configured to be compatible with tlv320aic3007 (3007 and 3107 are similar and the functionality I need is covered by the 3007 driver). All power supplies are connected directly to the power sources and we are using a gpio pin to drive the reset pin (gpio6 3)

The first issue was that the following message was shown during boot:

tlv320aic3x-codec 2-0018: Failed to init class D: -5

Attaching an oscilloscope to the i2c lines and the reset pin showed that the reset was always set to 0 during boot up. I found out that in the “probe” function, the reset pin was only configured to output but its value was never set. So I made the following two modifications to release the RESET in the probe function and to activate it on power down:

diff --git a/sound/soc/codecs/tlv320aic3x.c b/sound/soc/codecs/tlv320aic3x.c
index 76bc41b..d805b74 100644
--- a/sound/soc/codecs/tlv320aic3x.c
+++ b/sound/soc/codecs/tlv320aic3x.c
@@ -1370,6 +1370,12 @@
        regcache_cache_only(aic3x->regmap, true);
        ret = regulator_bulk_disable(ARRAY_SIZE(aic3x->supplies),
                          aic3x->supplies);
+
+       if (gpio_is_valid(aic3x->gpio_reset)) {
+           udelay(1);
+           gpio_set_value(aic3x->gpio_reset, 0);
+       }
+
    }
out:
    return ret;
@@ -1758,6 +1764,9 @@
        if (ret != 0)
            goto err;
        gpio_direction_output(aic3x->gpio_reset, 0);
+       gpio_set_value(aic3x->gpio_reset, 0);
+       udelay(1);
+       gpio_set_value(aic3x->gpio_reset, 1);
    }
    for (i = 0; i < ARRAY_SIZE(aic3x->supplies); i++)

This removed the “Failed to init class D: -5" error message but when trying to play a simple wav file "aplay Front_Center.wav", the command just hung and never finished. Trying different settings in the DTS didn’t help and I tried to look for another machine driver. Luckily I found an alternative machine driver which worked out of the box:
https://github.com/Ansync/kernel-tgif/blob/master/sound/soc/fsl/imx-tlv320aic3x.c

The DTS settings are:

/ {
   sound {
       compatible = "fsl,imx-audio-tlv320aic3x";
       model = "tlv320aic3007";
       ssi-controller = <&EDM1_AUD_I2S_CHANNEL>;
        cpu-dai = <&EDM1_AUD_I2S_CHANNEL>;
       audio-codec = <&codec>;
       audio-routing =
           "Ext Spk", "SPOP",
           "Ext Spk", "SPOM",
           "Line Out Jack", "LLOUT",
           "Line Out Jack", "RLOUT";
       mux-int-port = <EDM1_AUD_MUX_INT>;
       mux-ext-port = <EDM1_AUD_MUX_EXT>;
   };
};

&i2c3 {
   status = "okay";
    codec: tlv320aic310x@18 {
       compatible = "ti,tlv320aic3007";
       reg = <0x18>;
       gpio-reset = <&gpio6 3 GPIO_ACTIVE_LOW>;
       clocks = <&EDM1_AUD_CLK_SRC>;
        status = "okay";
    };
};
&ssi1 {
       fsl,mode = "i2s-master";
       status = "okay";
};

Finally sound was played out of the speaker. The picture below is a snapshot of the oscilloscope screen. The signals are:
-   The Analog line is the audio output
-   Digital 4 is i2c clock
-   Digital 5 is i2c data
-   Digital 6 is the reset pin

Re: TLV320AIC3107 on an i.MX6QP (EDM1-IMX6PLUS)

igorpadykov — Mon, 03 Jul 2017 22:58:33 GMT

Hi Slav

thank for sharing this experience as it may help other customers

working with TLV320AIC3107.

Best regards
igor

Re: TLV320AIC3107 on an i.MX6QP (EDM1-IMX6PLUS)

nguyenmr — Fri, 22 Sep 2017 03:47:50 GMT

Hi Slav,

can you show me driver: /sound/soc/codecs/tlv320aic3x.c?

i use TLV320AIC3105 codec on iMX6Q, i also use your machine driver :

https://github.com/Ansync/kernel-tgif/blob/master/sound/soc/fsl/imx-tlv320aic3x.c

but when playing music, i see only have MCLK, don't have clock on BCLK, WCLK, TXC

my issue here: https://community.nxp.com/thread/460769

Thank you!

BR/Nguyen

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