From mboxrd@z Thu Jan 1 00:00:00 1970 From: khilman@baylibre.com (Kevin Hilman) Date: Fri, 27 Apr 2018 12:15:39 -0700 Subject: [PATCH] ARM64: dts: meson: disable sd-uhs modes on the libretech-cc In-Reply-To: <20180426105046.14817-1-jbrunet@baylibre.com> (Jerome Brunet's message of "Thu, 26 Apr 2018 12:50:46 +0200") References: <20180426105046.14817-1-jbrunet@baylibre.com> Message-ID: <7hvacczcis.fsf@baylibre.com> To: linus-amlogic@lists.infradead.org List-Id: linus-amlogic.lists.infradead.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 From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kevin Hilman Subject: Re: [PATCH] ARM64: dts: meson: disable sd-uhs modes on the libretech-cc Date: Fri, 27 Apr 2018 12:15:39 -0700 Message-ID: <7hvacczcis.fsf@baylibre.com> References: <20180426105046.14817-1-jbrunet@baylibre.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <20180426105046.14817-1-jbrunet@baylibre.com> (Jerome Brunet's message of "Thu, 26 Apr 2018 12:50:46 +0200") Sender: linux-kernel-owner@vger.kernel.org To: Jerome Brunet Cc: Carlo Caione , devicetree@vger.kernel.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org List-Id: devicetree@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