From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758888AbeD0TPn (ORCPT ); Fri, 27 Apr 2018 15:15:43 -0400 Received: from mail-pg0-f54.google.com ([74.125.83.54]:36475 "EHLO mail-pg0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758707AbeD0TPl (ORCPT ); Fri, 27 Apr 2018 15:15:41 -0400 X-Google-Smtp-Source: AB8JxZpuOVeR+ZMICBXAybqtEQEqacnb1kvKF5mdU5IMD81y0qyvGJz3gK87y3mQmHko08rqlz/kcg== From: Kevin Hilman To: Jerome Brunet Cc: Carlo Caione , devicetree@vger.kernel.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] ARM64: dts: meson: disable sd-uhs modes on the libretech-cc Organization: BayLibre References: <20180426105046.14817-1-jbrunet@baylibre.com> Date: Fri, 27 Apr 2018 12:15:39 -0700 In-Reply-To: <20180426105046.14817-1-jbrunet@baylibre.com> (Jerome Brunet's message of "Thu, 26 Apr 2018 12:50:46 +0200") Message-ID: <7hvacczcis.fsf@baylibre.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Jerome Brunet writes: > There is a problem with the sd-uhs mode when doing a soft reboot. > Switching back from 1.8v to 3.3v messes with the card, which no longer > respond (timeout errors). According to the specification, we should > perform a card reset (power cycling the card) but this is something we > cannot control on this design. > > Then the only solution to restore the communication with the card is an > "unplug-plug" which is not acceptable > > Until we find a solution, if any, disable the sd-uhs modes on this design. > For the people using uhs at the moment, there will a performance drop as > a result. > > Fixes: 3cde63ebc85c ("ARM64: dts: meson-gxl: libretech-cc: enable high speed modes") > Signed-off-by: Jerome Brunet Applied to v4.17/fixes, and adding a Cc to stable. Thanks, Kevin