From: "Andrew F. Davis" <afd@ti.com>
To: Mark Brown <broonie@kernel.org>
Cc: "Mark Rutland" <mark.rutland@arm.com>,
devicetree@vger.kernel.org, alsa-devel@alsa-project.org,
"Tony Lindgren" <tony@atomide.com>,
"Liam Girdwood" <lgirdwood@gmail.com>,
linux-kernel@vger.kernel.org, "Rob Herring" <robh+dt@kernel.org>,
"Benoît Cousson" <bcousson@baylibre.com>
Subject: Re: [PATCH v2 10/19] ASoC: tlv320aic31xx: Add MICBIAS off setting
Date: Fri, 1 Dec 2017 08:56:31 -0600 [thread overview]
Message-ID: <afa96737-d17a-c854-b3a8-30730e06dd99@ti.com> (raw)
In-Reply-To: <20171201133028.svemo5qedyfqrt7y@sirena.org.uk>
On 12/01/2017 07:30 AM, Mark Brown wrote:
> On Wed, Nov 29, 2017 at 03:32:51PM -0600, Andrew F. Davis wrote:
>> Leaving microphone bias off is a valid setting and even used in the DT
>> binding document example. Add this setting here and document the same.
>
>> - ai31xx-micbias-vg - MicBias Voltage setting
>> + 0 or MICBIAS_OFF - MICBIAS output is powered off
>> 1 or MICBIAS_2_0V - MICBIAS output is powered to 2.0V
>> 2 or MICBIAS_2_5V - MICBIAS output is powered to 2.5V
>> 3 or MICBIAS_AVDD - MICBIAS output is connected to AVDD
>
> This doesn't make much sense. If we enable the microphone with a
> voltage of 0V that's not going to work terribly well - I'd expect this
> property to control the voltage set when it's enabled, not if it's
> enabled.
>
I agree about this not making much sense, but I'm not sure the right way
forward here.
Personally I wouldn't have put MicBias voltage in DT to begin with, it
is runtime configurable and depends on user runtime inserted microphone,
not really a hardware description :/
The enable/disable is controlled by a DAPM and should be wired to enable
whenever we are recording from the related microphone pin. So then
without MICBIAS_OFF the user is forced to select from the above voltages
whenever recording, which may not be correct if they are using a mic
that doesn't need bias.
The best option I think would be to drop this from DT, but I don't feel
like fighting that battle right now.
next prev parent reply other threads:[~2017-12-01 14:56 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-29 21:32 [PATCH v2 00/19] Add Headphone Detection to TLV320AIC31xx Driver Andrew F. Davis
2017-11-29 21:32 ` [PATCH v2 01/19] ASoC: tlv320aic31xx: File header and copyright cleanup Andrew F. Davis
2017-11-30 12:29 ` Mark Brown
2017-11-30 12:33 ` Applied "ASoC: tlv320aic31xx: File header and copyright cleanup" to the asoc tree Mark Brown
2017-11-29 21:32 ` [PATCH v2 02/19] ASoC: tlv320aic31xx: Change aic31xx_power_off return type to void Andrew F. Davis
2017-11-30 12:32 ` Applied "ASoC: tlv320aic31xx: Change aic31xx_power_off return type to void" to the asoc tree Mark Brown
[not found] ` <20171129213300.20021-1-afd-l0cyMroinI0@public.gmane.org>
2017-11-29 21:32 ` [PATCH v2 03/19] ASoC: tlv320aic31xx: Move ACPI table next to OF table Andrew F. Davis
2017-11-30 12:32 ` Applied "ASoC: tlv320aic31xx: Move ACPI table next to OF table" to the asoc tree Mark Brown
2017-11-29 21:32 ` [PATCH v2 08/19] ASoC: tlv320aic31xx: Switch GPIO handling to use gpiod_* API Andrew F. Davis
2017-12-04 16:47 ` Andrew F. Davis
2017-12-05 21:23 ` Andrew F. Davis
2017-12-06 12:46 ` Mark Brown
2017-11-29 21:32 ` [PATCH v2 18/19] ASoC: tlv320aic31xx: Add headphone/headset detection Andrew F. Davis
[not found] ` <20171129213300.20021-19-afd-l0cyMroinI0@public.gmane.org>
2017-12-01 13:41 ` Mark Brown
2017-12-06 17:25 ` Andrew F. Davis
2017-12-06 17:32 ` Mark Brown
2017-12-06 17:47 ` Andrew F. Davis
2017-12-06 17:52 ` Mark Brown
2017-11-29 21:32 ` [PATCH v2 04/19] ASoC: tlv320aic31xx: General source formatting cleanup Andrew F. Davis
2017-12-01 13:43 ` Applied "ASoC: tlv320aic31xx: General source formatting cleanup" to the asoc tree Mark Brown
2017-11-29 21:32 ` [PATCH v2 05/19] ASoC: tlv320aic31xx: Fix GPIO1 register definition Andrew F. Davis
2017-11-30 12:32 ` Applied "ASoC: tlv320aic31xx: Fix GPIO1 register definition" to the asoc tree Mark Brown
2017-11-29 21:32 ` [PATCH v2 06/19] ASoC: tlv320aic31xx: Reformat header file using GENMASK and BIT macros Andrew F. Davis
2017-11-29 21:32 ` [PATCH v2 07/19] ASoC: tlv320aic31xx: Merge init function into probe Andrew F. Davis
2017-11-29 21:32 ` [PATCH v2 09/19] ASoC: tlv320aic31xx: Remove platform data Andrew F. Davis
[not found] ` <20171129213300.20021-10-afd-l0cyMroinI0@public.gmane.org>
2017-12-01 13:26 ` Mark Brown
2017-12-05 21:20 ` Andrew F. Davis
2017-12-06 12:45 ` Mark Brown
2017-12-06 16:19 ` Andrew F. Davis
[not found] ` <10f1b19b-4a0a-e336-b757-933d46b5c8e9-l0cyMroinI0@public.gmane.org>
2017-12-06 17:30 ` Mark Brown
2017-12-06 17:48 ` Andrew F. Davis
[not found] ` <b6f581be-6d3a-6fc3-036f-9efc1bfc2429-l0cyMroinI0@public.gmane.org>
2017-12-06 18:15 ` Mark Brown
2017-12-06 18:40 ` Andrew F. Davis
[not found] ` <86e13e26-e8d5-35ed-6bd0-d91d9323d5e6-l0cyMroinI0@public.gmane.org>
2017-12-06 19:11 ` Mark Brown
2017-12-06 19:15 ` Andrew F. Davis
2017-11-29 21:32 ` [PATCH v2 10/19] ASoC: tlv320aic31xx: Add MICBIAS off setting Andrew F. Davis
[not found] ` <20171129213300.20021-11-afd-l0cyMroinI0@public.gmane.org>
2017-12-01 13:30 ` Mark Brown
2017-12-01 14:56 ` Andrew F. Davis [this message]
2017-12-01 17:43 ` Mark Brown
2017-11-29 21:32 ` [PATCH v2 11/19] ASoC: tlv320aic31xx: Check clock and divider before division Andrew F. Davis
2017-11-29 21:32 ` [PATCH v2 12/19] ASoC: tlv320aic31xx: Add CODEC clock slave support Andrew F. Davis
2017-12-01 13:43 ` Applied "ASoC: tlv320aic31xx: Add CODEC clock slave support" to the asoc tree Mark Brown
2017-11-29 21:32 ` [PATCH v2 13/19] ASoC: tlv320aic31xx: Fix inverted BCLK handling Andrew F. Davis
2017-12-01 13:42 ` Applied "ASoC: tlv320aic31xx: Handle inverted BCLK in non-DSP modes" to the asoc tree Mark Brown
2017-11-29 21:32 ` [PATCH v2 14/19] ASoC: tlv320aic31xx: Remove regulator notification handling Andrew F. Davis
2017-12-01 13:36 ` Mark Brown
2017-12-01 15:01 ` Andrew F. Davis
2017-12-01 15:55 ` Mark Brown
2017-11-29 21:32 ` [PATCH v2 15/19] ASoC: tlv320aic31xx: Reset registers during power up Andrew F. Davis
2017-12-01 13:37 ` Mark Brown
2017-12-01 15:04 ` Andrew F. Davis
2017-12-01 15:55 ` Mark Brown
2017-11-29 21:32 ` [PATCH v2 16/19] ASoC: tlv320aic31xx: Add short circuit detection support Andrew F. Davis
[not found] ` <20171129213300.20021-17-afd-l0cyMroinI0@public.gmane.org>
2017-12-01 13:39 ` Mark Brown
2017-12-01 15:32 ` Andrew F. Davis
2017-12-01 15:57 ` Mark Brown
2017-12-06 17:15 ` Andrew F. Davis
2017-12-06 20:22 ` Andrew F. Davis
2017-12-07 12:03 ` Mark Brown
2017-12-07 15:37 ` Andrew F. Davis
2017-12-07 17:23 ` Mark Brown
2017-11-29 21:32 ` [PATCH v2 17/19] ASoC: tlv320aic31xx: Add overflow " Andrew F. Davis
2017-11-29 21:33 ` [PATCH v2 19/19] ASoC: tlv320aic31xx: Add button press detection Andrew F. Davis
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