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From: Mark Brown <broonie@kernel.org>
To: Peter Geis <pgwipeout@gmail.com>
Cc: Jaehoon Chung <jh80.chung@samsung.com>,
	Ulf Hansson <ulf.hansson@linaro.org>,
	Liam Girdwood <lgirdwood@gmail.com>,
	Rob Herring <robh+dt@kernel.org>,
	linux-mmc@vger.kernel.org,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	"open list:ARM/Rockchip SoC..."
	<linux-rockchip@lists.infradead.org>,
	devicetree@vger.kernel.org
Subject: Re: [BUG] mmc_regulator_set_ocr can't cope with regulator-fixed
Date: Thu, 5 Aug 2021 14:08:42 +0100	[thread overview]
Message-ID: <20210805130842.GO26252@sirena.org.uk> (raw)
In-Reply-To: <CAMdYzYpR6br7s1RD2ze92WzJjtEDZwy9qS6YhghgXy7F91keFg@mail.gmail.com>

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On Thu, Aug 05, 2021 at 08:58:58AM -0400, Peter Geis wrote:
> On Thu, Aug 5, 2021 at 8:47 AM Mark Brown <broonie@kernel.org> wrote:

> > One thing to watch out for with this approach is if there's things that
> > really need a specific voltage to be set then you'll have to stop those
> > things happening if you've got a voltage regulator that can't deliver a
> > voltage in the required range.  I don't know if this affects MMC or not,
> > if it's just a case of being less efficient it's not such an issue.

> Yeah, but if this is a fixed regulator and it's a problem, then the
> hardware is screwed anyways.

Well, the fact that the voltage is being changed at runtime indicates
that we're changing something from whatever was in the fixed setup - it
can sometimes be that we don't have access to some higher performance or
lower power features for example.  That's not ideal but works perfectly
safely.

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  reply	other threads:[~2021-08-05 13:09 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20210804143357epcas1p1c67eca591d8bb557c11b8175baaa8550@epcas1p1.samsung.com>
2021-08-04 14:32 ` Peter Geis
2021-08-04 16:15   ` Mark Brown
2021-08-05 10:00   ` Jaehoon Chung
2021-08-05 11:38     ` Peter Geis
2021-08-05 12:46       ` Mark Brown
2021-08-05 12:58         ` Peter Geis
2021-08-05 13:08           ` Mark Brown [this message]
2021-08-06  8:14             ` Ravikumar Kattekola
2021-08-06 10:59               ` Mark Brown

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