From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lee Jones Subject: Re: [PATCH 0/3] ARM: ux500: Fix SD-card regression by using GPIO regulator Date: Mon, 20 Apr 2015 19:24:16 +0100 Message-ID: <20150420182416.GG3447@x1> References: <1429538553-17366-1-git-send-email-ulf.hansson@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <1429538553-17366-1-git-send-email-ulf.hansson-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Ulf Hansson Cc: Linus Walleij , linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Bjorn Andersson List-Id: devicetree@vger.kernel.org Where did you get this email address from? > This patchset fixes an old stability issue for detection of SD-cards. The DT > node for the GPIO regulator which controls the I/O voltage level towards the > SD-card was disabled in below commit. > > c94a4ab7af3f ("ARM: ux500: Disable the MMCI gpio-regulator by default") > > The conseqeunce from that commit, was that the initially chosen voltage level > remained, even after I/O voltage switch sequence was performed for UHS-I cards, > since no GPIO regulator could be fetched. > > Appearantly some SD-cards didn't have any problem to cope with that, but some > had. > > Recently thorough error handling was introduced for the MMCI mmc host driver, > while fetching the regulators for the SD-card. That actually made the driver to > continously return -EPROBE_DEFER while probing, which thus meant failing all the > times instead of just failing "sometimes". > > The commit that introduced the thorough error handling is: > 9369c97cc7ec ("mmc: mmci: Cascade EPROBE_DEFER from regulators") > > > Ulf Hansson (3): > ARM: ux500: Move GPIO regulator for SD-card into board DTSs > ARM: ux500: Enable GPIO regulator for SD-card for HREF boards > ARM: ux500: Enable GPIO regulator for SD-card for snowball > > arch/arm/boot/dts/ste-dbx5x0.dtsi | 17 ----------------- > arch/arm/boot/dts/ste-href.dtsi | 15 +++++++++++++++ > arch/arm/boot/dts/ste-snowball.dts | 13 +++++++++++++ > 3 files changed, 28 insertions(+), 17 deletions(-) > -- 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