Re: Sound record on Devkit8000 with DT boot issue

From: Peter Ujfalusi
Date: Mon Feb 11 2013 - 08:18:46 EST


On 02/10/2013 04:21 PM, Anil Kumar wrote:
> Hi All,
>
> I am working on Devkit8000 and adding DT support for that. I am trying
> to add sound DT node support for this boards.
> I have nearly done with this but facing issue on record. I do not have
> much knowledge of twl4030 audio codec but with
> small Hack[1] (as MainMic connected to the input jack) i am able to
> record sound on Devkit8000.
> I do not know that MICBIAS1_EN can be enable by amixer commands.
> Could you please help me to get out of this ?

You need to pass the routing information via DT for Devkit8000. This is not
done for the BeagleBoard since it works without it (no need for MICBIAS for
example)

>
>
> 1) Hack [1]
>
> diff --git a/sound/soc/codecs/twl4030.c b/sound/soc/codecs/twl4030.c
> index 63b280b..6780681 100644
> --- a/sound/soc/codecs/twl4030.c
> +++ b/sound/soc/codecs/twl4030.c
> @@ -1473,7 +1473,7 @@ static const struct snd_soc_dapm_widget
> twl4030_dapm_widgets[] = {
> SND_SOC_DAPM_SUPPLY("micbias2 select", TWL4030_REG_MICBIAS_CTL, 6, 0,
> NULL, 0),
>
> - SND_SOC_DAPM_MICBIAS("Mic Bias 1", TWL4030_REG_MICBIAS_CTL, 0, 0),
> + SND_SOC_DAPM_MICBIAS("Mic Bias 1", TWL4030_REG_MICBIAS_CTL, 0, 1),

Yes, this is HACK and it is wrong at the same time.

> SND_SOC_DAPM_MICBIAS("Mic Bias 2", TWL4030_REG_MICBIAS_CTL, 1, 0),
> SND_SOC_DAPM_MICBIAS("Headset Mic Bias", TWL4030_REG_MICBIAS_CTL, 2, 0),
>
>
> 2) Sound DT node patch for Devkit8000
>
> diff --git a/arch/arm/boot/dts/omap3-
> devkit8000.dts b/arch/arm/boot/dts/omap3-devkit8000.dts
> index dc59272..5f3eec0 100644
> --- a/arch/arm/boot/dts/omap3-devkit8000.dts
> +++ b/arch/arm/boot/dts/omap3-devkit8000.dts
> @@ -44,11 +44,22 @@
> };
>
> };
> +
> + sound {
> + compatible = "ti,omap-twl4030";
> + ti,model = "devkit8000";
> +
> + ti,mcbsp = <&mcbsp2>;
> + ti,codec = <&twl_audio>;

Here you should have something like:
ti,audio-routing =
"Ext Spk", "PREDRIVEL",
"Ext Spk", "PREDRIVER",
"MAINMIC", "Main Mic",
"Main Mic", "Mic Bias 1";

So you connect the MicBias1 to Main Mic. When you start playback MicBias1 will
be turned on for you.

> + };
> };
>
> &omap3_pmx_core {
> pinctrl-names = "default";
> - pinctrl-0 = <&i2c1_pins>;
> + pinctrl-0 = <
> + &i2c1_pins
> + &mcbsp2_pins
> + >;
>
> leds_pins: pinmux_led_pins {
> pinctrl-single,pins = <
> @@ -65,6 +76,21 @@
> 0x18c 0x118 /* I2C1_SDA */
> >;
> };
> +
> + mcbsp2_pins: pinmux_mcbsp2_pins {
> + pinctrl-single,pins = <
> + /*
> + * MCBSP2_FSX, OMAP_MUX_MODE0 | OMAP_PIN_INPUT,
> + * MCBSP2_CLKX, OMAP_MUX_MODE0 | OMAP_PIN_INPUT
> + */
> + 0x10c 0x01000100
> + /*
> + * MCBSP2_DR, OMAP_MUX_MODE0 | OMAP_PIN_INPUT,
> + * MCBSP2_DX, OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT
> + */
> + 0x110 0x00000100
> + >;
> + };
> };
>
> &i2c1 {
> @@ -74,6 +100,14 @@
> reg = <0x48>;
> interrupts = <7>; /* SYS_NIRQ cascaded to intc */
> interrupt-parent = <&intc>;
> +
> + twl_audio: audio {
> + compatible = "ti,twl4030-audio";
> + codec {
> + ti,ramp_delay_value = <3>;
> + ti,offset_cncl_path = <0x31>;
> + };
> + };
> };
> };
>
> 3) Playback amixer commands
> amixer set 'PredriveR Mixer AudioR2' on
> amixer set 'PredriveL Mixer AudioL2' on
> amixer set PreDriv 100 unmute
> amixer set 'DAC2 Digital Fine' 100
>
> Thanks,
> Anil
>


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