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From: Eric Nelson <eric.nelson@boundarydevices.com>
To: Mark Brown <broonie@kernel.org>
Cc: fabio.estevam@freescale.com, alsa-devel@alsa-project.org,
	lars@metafoo.de, tiwai@suse.de, lgirdwood@gmail.com,
	rmk+kernel@arm.linux.org.uk, jean-michel.hautbois@vodalys.com,
	troy.kisky@boundarydevices.com
Subject: Re: [RFC PATCH 6/6] ASoC: sgtl5000: Don't disable regulators in SND_SOC_BIAS_OFF
Date: Fri, 06 Mar 2015 15:35:36 -0700	[thread overview]
Message-ID: <54FA2BB8.10203@boundarydevices.com> (raw)
In-Reply-To: <20150306201646.GA21293@sirena.org.uk>

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Hi Mark,

On 03/06/2015 01:16 PM, Mark Brown wrote:
> On Thu, Feb 26, 2015 at 03:54:33PM -0700, Eric Nelson wrote:
>> Disabling the SGTL5000 through regulators would certainly save 
>> power than simply disabling the reference voltages as described 
>> in the data sheet, but won't properly restore things on resume.
> 
> Why not just fix the code, reinitializing the chip is usually
> pretty trivial?
> 

Apparently not.

I think it's fair to say that nobody has hooked up switching regulators
using this driver, since they can't function without some form of this
patch set.

Once we have working regulator support, adding code to save power
additional power here might make sense, but not until then.

In other words, these are really elaborate no-ops now.

Regards,


Eric
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  reply	other threads:[~2015-03-06 22:35 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-26 22:54 [PATCH RFC 0/6] ASoC: sgtl5000: fix use of regulators and internal LDO Eric Nelson
2015-02-26 22:54 ` [RFC PATCH 1/6] ASoC: sgtl5000: fix regulator support Eric Nelson
2015-03-06 20:04   ` Mark Brown
2015-03-06 21:09     ` Eric Nelson
2015-03-07  9:59       ` Mark Brown
2015-02-26 22:54 ` [RFC PATCH 2/6] ASoC: sgtl5000: write all default registers Eric Nelson
2015-03-06 20:14   ` Mark Brown
2015-03-06 22:24     ` Eric Nelson
2016-06-15 14:38   ` Applied "ASoC: sgtl5000: Write all default registers" to the asoc tree Mark Brown
2015-02-26 22:54 ` [RFC PATCH 3/6] ASoC: sgtl5000: initialize CHIP_ANA_POWER to power-on defaults Eric Nelson
2015-03-06 20:12   ` Mark Brown
2015-03-06 22:14     ` Eric Nelson
2015-03-07 10:28       ` Mark Brown
2015-02-26 22:54 ` [RFC PATCH 4/6] ASoC: sgtl5000: check return values Eric Nelson
2015-02-26 22:54 ` [RFC PATCH 5/6] ASoC: sgtl5000: disable internal PLL early Eric Nelson
2015-03-06 20:15   ` Mark Brown
2015-03-06 22:16     ` Eric Nelson
2016-06-15 14:38   ` Applied "ASoC: sgtl5000: Disable internal PLL early" to the asoc tree Mark Brown
2015-02-26 22:54 ` [RFC PATCH 6/6] ASoC: sgtl5000: Don't disable regulators in SND_SOC_BIAS_OFF Eric Nelson
2015-03-06 20:16   ` Mark Brown
2015-03-06 22:35     ` Eric Nelson [this message]
2015-03-07 10:41       ` Mark Brown
2015-03-06 22:49 ` [PATCH RFC 0/6] ASoC: sgtl5000: fix use of regulators and internal LDO Eric Nelson
2015-03-06 22:53   ` Russell King - ARM Linux
2015-03-06 22:58     ` Eric Nelson
2015-03-06 23:16       ` Eric Nelson
2015-03-06 23:24         ` Russell King - ARM Linux
2015-03-06 23:31           ` Eric Nelson
2015-03-07 10:45   ` Mark Brown

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