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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <53F7BDD8.7060500@collabora.co.uk>
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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/