From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753349AbbJNBkj (ORCPT ); Tue, 13 Oct 2015 21:40:39 -0400 Received: from mailout1.samsung.com ([203.254.224.24]:47253 "EHLO mailout1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752807AbbJNBkf (ORCPT ); Tue, 13 Oct 2015 21:40:35 -0400 X-AuditID: cbfee68f-f796f6d0000014a4-d7-561db290aa3f Message-id: <561DB290.5070903@samsung.com> Date: Wed, 14 Oct 2015 10:40:32 +0900 From: Jaehoon Chung User-Agent: Mozilla/5.0 (X11; Linux i686; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 MIME-version: 1.0 To: Krzysztof Kozlowski , Alim Akhtar Cc: Anand Moon , Kukjin Kim , Javier Martinez Canillas , Lukasz Majewski , "devicetree@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-samsung-soc@vger.kernel.org" , Linux Kernel , Douglas Anderson Subject: Re: [PATCH 3/3] ARM: dts: exynos5422-odroidxu3: Added UHS-I bus speed support 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> <561DACC6.9040209@samsung.com> In-reply-to: <561DACC6.9040209@samsung.com> Content-type: text/plain; charset=utf-8 Content-transfer-encoding: 7bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrDIsWRmVeSWpSXmKPExsWyRsSkRHfiJtkwgzOvmS2W3qq2mH/kHKvF 2WUH2SzevF3DZPH6haFF/2Og3JuHmxktNj2+xmpxedccNosZ5/cxWazbeIvdgdtjdsNFFo+d s+6ye2xa1cnmsXlJvceWfiCvb8sqRo/Pm+QC2KO4bFJSczLLUov07RK4MuY9ustesJWvYsu/ nYwNjLu5uxg5OSQETCQ+7f3JAmGLSVy4t54NxBYSWMEosfQdL0xN++WzQHEuoPgsRonOZ8dZ IZwHjBIzli9nAqniFdCSmPXjMmMXIwcHi4CqxMU9liBhNgEdie3fjoOViAqESTxYt5cVolxQ 4sfke2CLRQQiJPo2NDCBzGQWuMUs8bJxHdgcYaDEiatGELsOsEg8vvsV7DpOAW2JC+0X2EBq mAXUJaZMyQUJMwvIS2xe85YZpF5C4Ce7ROftKewgCRYBAYlvkw+xgNRLCMhKbDrADPGYpMTB FTdYJjCKzUJy0iyEqbOQTF3AyLyKUTS1ILmgOCm9yFivODG3uDQvXS85P3cTIzBST/971r+D 8e4B60OMAhyMSjy8Gatlw4RYE8uKK3MPMZoCHTGRWUo0OR+YDvJK4g2NzYwsTE1MjY3MLc2U xHkXSv0MFhJITyxJzU5NLUgtii8qzUktPsTIxMEp1cAYpfh7wqZVPezSe6++7uno3tEYGlNv G3HevPekwk1b6e3PxKx4ZutIVtqpOjuoT9r+acPtT3dC4pm8pq2K7RRavJA3JOfJp/VGL73s F/vbLemYVWd588NO6R0NCutXcc9Ne+P6uGA1e1Dbn5VLilee6I1WL4viOHFPo9Jnv9y2u7aP J6woLXmuxFKckWioxVxUnAgAHK7N5M8CAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFupileLIzCtJLcpLzFFi42I5/e+xoO6ETbJhBic7zC2W3qq2mH/kHKvF 2WUH2SzevF3DZPH6haFF/+PXzBZvHm5mtNj0+BqrxeVdc9gsZpzfx2SxbuMtdgduj9kNF1k8 ds66y+6xaVUnm8fmJfUeW/qBvL4tqxg9Pm+SC2CPamC0yUhNTEktUkjNS85PycxLt1XyDo53 jjc1MzDUNbS0MFdSyEvMTbVVcvEJ0HXLzAE6UUmhLDGnFCgUkFhcrKRvh2lCaIibrgVMY4Su b0gQXI+RARpIWMOYMe/RXfaCrXwVW/7tZGxg3M3dxcjJISFgItF++SwbhC0mceHeeiCbi0NI YBajROez46wQzgNGiRnLlzOBVPEKaEnM+nGZsYuRg4NFQFXi4h5LkDCbgI7E9m/HwUpEBcIk HqzbywpRLijxY/I9FhBbRCBCom9DAxPITGaBW8wSLxvXgc0RBkqcuGoEsesAi8Tju1/BLuIU 0Ja40H6BDaSGWUBdYsqUXJAws4C8xOY1b5knMAJdibBiFkLVLCRVCxiZVzFKpBYkFxQnpeca 5aWW6xUn5haX5qXrJefnbmIEp4Nn0jsYD+9yP8QowMGoxMObsVo2TIg1say4MvcQowQHs5II b+oSoBBvSmJlVWpRfnxRaU5q8SFGU2AQTGSWEk3OB6aqvJJ4Q2MTMyNLI3NDCyNjcyVx3huH GMKEBNITS1KzU1MLUotg+pg4OKUaGAN3sLOxpJXzZaxckTmTzeyuQf9T+xz9AveM2iV/HvWX ZubODpn9tUTSLIA9/N5lHj6TJoGwC85hDHcX7E/bEV94qeR3jGFS/K2LJQdL64IKbUNq6jWW ZosxM1zbwns77+1CSffrZV+tZ3JVN+5+Pu+zXJ+zLseVxJpS0SlsD4QVw3Tq0oOUWIozEg21 mIuKEwH54k9vHQMAAA== DLP-Filter: Pass X-MTR: 20000000000000000@CPGS X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/14/2015 10:15 AM, Krzysztof Kozlowski wrote: > 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... You're right. It's not UHS mode. it mentions eMMC's HS400 mode. UHS and HS400 are difference mode. eMMC mode are supported > 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*. Well, I think you want to know whether it supported or not. Then you can find the information at User manual. In mobile storage part of User manual, it described the overview. Mobile storage host supports these specification: - Secure Digital memory (SD memory version 3.0) - Secure Digital I/O SDIO (SDIO version 3.0) - etc... SD3.0 is supported UHS-I mode. If user manual of exynos5422 is mentioned this specification, it should be supported UHS-I mode. If my understanding is wrong, let me know, plz. Best Regards, Jaehoon Chung > > Best regards, > Krzysztof > >