From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752889AbbJNBQD (ORCPT ); Tue, 13 Oct 2015 21:16:03 -0400 Received: from mailout2.w1.samsung.com ([210.118.77.12]:23016 "EHLO mailout2.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752537AbbJNBQA (ORCPT ); Tue, 13 Oct 2015 21:16:00 -0400 X-AuditID: cbfec7f5-f794b6d000001495-97-561daccd6718 Subject: Re: [PATCH 3/3] ARM: dts: exynos5422-odroidxu3: Added UHS-I bus speed support To: Alim Akhtar References: <1444578364-1384-1-git-send-email-linux.amoon@gmail.com> <1444578364-1384-3-git-send-email-linux.amoon@gmail.com> <561B48B7.1040201@samsung.com> <561C4CEE.3050905@samsung.com> <561C7DF1.6000609@samsung.com> <561D9ACE.6050103@samsung.com> Cc: Anand Moon , Kukjin Kim , Javier Martinez Canillas , Lukasz Majewski , Jaehoon Chung , "devicetree@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-samsung-soc@vger.kernel.org" , Linux Kernel , Douglas Anderson From: Krzysztof Kozlowski X-Enigmail-Draft-Status: N1110 Message-id: <561DACC6.9040209@samsung.com> Date: Wed, 14 Oct 2015 10:15:50 +0900 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 MIME-version: 1.0 In-reply-to: Content-type: text/plain; charset=utf-8 Content-transfer-encoding: 7bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmpmkeLIzCtJLcpLzFFi42I5/e/4Zd2za2TDDPa80LVYeqvaYv6Rc6wW Z5cdZLN483YNk8WNX22sFq9fGFr0P37NbPHm4WZGi02Pr7FaXN41h81ixvl9TBbrNt5id+Dx mN1wkcVj56y77B6bVnWyeWxeUu+xpR/I69uyitHj8ya5APYoLpuU1JzMstQifbsEroxZh2oK FnNU9By+zdrAeJGti5GTQ0LAROL8zV3sELaYxIV764HiXBxCAksZJc60LmCCcL4wSiyf/oax i5GDQ1ggQuLEVSOQBhEBdYmX9zeyQtTMZ5GYsHoHE0iCWaCFRWLy7lAQm03AWGLz8iVQ2+Qk ersnsYDM4RXQkpgyE6yERUBVYum8ZWBHiAKNnzihgRXE5hUQlPgx+R5YOadAsET/miIQkxlo 7ZQpuRCL5CU2r3nLPIFRcBaShlkIVbOQVC1gZF7FKJpamlxQnJSea6RXnJhbXJqXrpecn7uJ ERI1X3cwLj1mdYhRgINRiYf3RaRMmBBrYllxZe4hRgkOZiUR3tQlsmFCvCmJlVWpRfnxRaU5 qcWHGKU5WJTEeWfueh8iJJCeWJKanZpakFoEk2Xi4JRqYCz8kdXZm6bA8NBVok9VwLpoZbRB nM/JHj+5N5mrZsaHe1+SUeR71a5fc6d3b57ZqdDVTpVaCvOjE9mPZ/F+e9YwnT3u86LUr+sY P39/r/pyuc+iPYvjnilkpR8rO86w5dxv9cCanNuzVD7fv/bPon7XybdqOueCOc+/u2ChueRa eeVR2ZcvfymxFGckGmoxFxUnAgA8Ao0QlgIAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 14.10.2015 10:06, Alim Akhtar wrote: > +Doug > Hello, > AFAIR, dw_mmc host controller does support UHS-I [1], specially SDR50 > and SDR104 modes. > > [1]: http://www.spinics.net/lists/linux-mmc/msg28186.html > > What I remember is, one need to set "broken-cd" property also in order > to make it work because of the vqmmc and vmmc connection on board. I > didn't find the link right now, but you can search on the web, there > was a long discussion about handling this. > Have not checked it recently, so not sure if this got broken somehow. > Please, don't top post. I am not a SD/MMC specialist (I do not feel enough confident in its internals) but the datasheet for 5422 does not mention UHS. However it mentions "High Speed DDR Mode with 200 MHz clock rate (HS400)". This does not look like UHS... https://www.sdcard.org/developers/overview/bus_speed/ This of course is not a definite proof that 5422 does not support UHS. I am just saying that I couldn't find any information that *it does*. Best regards, Krzysztof