linux-kernel - Re: [RFC/PATCH 0/2] mmc: sdhci: Workaround Intel Merrifield issue for HS200

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Date:	Fri, 20 Dec 2013 11:00:23 +0800
From:	Dong Aisheng <dongas86@...il.com>
To:	David Cohen <david.a.cohen@...ux.intel.com>
Cc:	Chris Ball <cjb@...top.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	gregkh@...uxfoundation.org,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	chuanxiao.dong@...el.com
Subject: Re: [RFC/PATCH 0/2] mmc: sdhci: Workaround Intel Merrifield issue for HS200

On Wed, Nov 13, 2013 at 5:49 AM, David Cohen
<david.a.cohen@...ux.intel.com> wrote:
> On 10/29/2013 10:58 AM, David Cohen wrote:
>>
>> Hi,
>>
>> SDHCI used to work well on Intel Merrifield until this patch was applied:
>>
>> commit 156e14b126ffb6f040bc6f1aff3c51077e42a744
>> Author: Giuseppe CAVALLARO <peppe.cavallaro@...com>
>> Date:   Wed Jun 12 08:16:38 2013 +0200
>>
>>      mmc: sdhci: fix caps2 for HS200
>>
>>      Although the HC supports HS200 (eMMC) the caps2 are always zero; this
>>      means there's no way to use the super speed mode (when init the
>> card).
>>
>>      If the HC support SDR104, for SD3.0, so it also supports HS200 for
>> eMMC
>>      and this patch just sets the MMC_CAP2_HS200 in the host caps2 field.
>>
>> Looks like there is a hw issue with unknown root cause so far.
>>
>> Is it acceptable to have the quirk I'm proposing to workaround the issue?
>
>
> Ping. Any comments here?
>

Chris,
Can you pick this one?
IMX also needs this quirk for imx6q/dl since it can not meet HS200
timing requirement.


David,
Is the unkonwn hw issue in your patch #2 resolved now?
If yes, you may not need this quirk.
I could resend it with your sign-off with IMX patches.

Regards
Dong Aisheng

> Br, David Cohen
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