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

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Date:	Sat, 23 Aug 2014 00:02:00 +0200
From:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
To:	Mark Brown <broonie@...nel.org>
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

Hello Mark,

On 08/22/2014 08:30 PM, Mark Brown wrote:
> 
>> 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?
> 

Good question. I'm not that familiar with the dw_mmc host controller nor
its driver implementation so I'll let Yuvaraj or Doug to answer that.

Best regards,
Javier
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