linux-kernel - Re: [PATCH v9 1/2] regulator: Add driver for max77802 PMIC PMIC regulators

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Date:	Fri, 22 Aug 2014 13:30:54 -0500
From:	Mark Brown <broonie@...nel.org>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Cc:	Yuvaraj Cd <yuvaraj.lkml@...il.com>,
	Doug Anderson <dianders@...omium.org>,
	Olof Johansson <olof@...om.net>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Abhilash Kesavan <a.kesavan@...sung.com>,
	Prashanth G <prashanth.g@...sung.com>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	sunil joshi <joshi@...sung.com>
Subject: Re: [PATCH v9 1/2] regulator: Add driver for max77802 PMIC PMIC
 regulators

On Fri, Aug 22, 2014 at 07:53:19PM +0200, Javier Martinez Canillas wrote:
> On 08/22/2014 04:45 PM, Mark Brown wrote:
> > On Fri, Aug 22, 2014 at 02:15:46PM +0200, Javier Martinez Canillas wrote:

> >> Mark, any opinions on how this should be solved will be highly appreciated.

> > If someone could tell me what "this" is that'd help...

> Sorry for not being clear on that regard. By "this" I meant the problem
> reported by Yuvaraj.

That mail was rather lengthy and seemed to be discussing several issues.

> The problem is that one of these regulators is used as the vqmmc-supply
> (VCCQ/VDD_IO) so the mmc host controller driver disables it on
> MMC_POWER_OFF. Now AFAIK (Yuvaraj can correct me what I got wrong) this
> shouldn't be an issue since on card detection, the vqmmc supply should be
> enabled again but on Exynos the built-in card detect line is on the same
> power rail as vqmmc. That means that disabling the regulator prevents card
> insertions to be detected.

If the MMC host controller needs a supply enabling in order to do card
detection and it's supposed to be doing card detection I'd expect it to
be enabling that supply.  Why is it not doing that?

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