linux-kernel - Re: [PATCH 3/3] ARM: dts: exynos5422-odroidxu3: Added UHS-I bus speed support

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Date:	Wed, 14 Oct 2015 07:43:27 +0530
From:	Alim Akhtar <alim.akhtar@...il.com>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc:	Anand Moon <linux.amoon@...il.com>, Kukjin Kim <kgene@...nel.org>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Lukasz Majewski <l.majewski@...sung.com>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Douglas Anderson <dianders@...omium.org>
Subject: Re: [PATCH 3/3] ARM: dts: exynos5422-odroidxu3: Added UHS-I bus speed support

On Wed, Oct 14, 2015 at 6:45 AM, Krzysztof Kozlowski
<k.kozlowski@...sung.com> 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 sorry, but I didn't get this, what is the guide line here???

> 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
>



-- 
Regards,
Alim
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