From mboxrd@z Thu Jan 1 00:00:00 1970 From: Javier Martinez Canillas Subject: Re: [PATCH v9 1/2] regulator: Add driver for max77802 PMIC PMIC regulators Date: Sat, 23 Aug 2014 00:02:00 +0200 Message-ID: <53F7BDD8.7060500@collabora.co.uk> References: <1408350762-15520-1-git-send-email-javier.martinez@collabora.co.uk> <1408350762-15520-2-git-send-email-javier.martinez@collabora.co.uk> <53F73472.8010609@collabora.co.uk> <20140822144531.GV24407@sirena.org.uk> <53F7838F.8060906@collabora.co.uk> <20140822183054.GY24407@sirena.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20140822183054.GY24407-GFdadSzt00ze9xe1eoZjHA@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Mark Brown Cc: Yuvaraj Cd , Doug Anderson , Olof Johansson , "devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , linux-samsung-soc , "linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org" , "linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , Abhilash Kesavan , Prashanth G , Alim Akhtar , sunil joshi List-Id: linux-samsung-soc@vger.kernel.org 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 devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html