On Wed, Oct 14, 2015 at 7:22 AM, Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx> wrote: > On 14.10.2015 10:40, Jaehoon Chung wrote: >> 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. > > Thanks! Indeed datasheet mentions that supported SD and SDIO is version > 3.0 (not 3.01... which seems irrelevant because 3.0 introduced UHS-I, > right?). > Yes, your understanding is right. SD3.0 does includes UHS-I. > Best regards, > Krzysztof -- Regards, Alim -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
