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From: Stefan Roese <sr@denx.de>
To: Ulf Hansson <ulf.hansson@linaro.org>
Cc: linux-mmc <linux-mmc@vger.kernel.org>,
	linux-omap <linux-omap@vger.kernel.org>,
	Thorsten Einsbein <thorsten.eisbein@head-acoustics.de>,
	Balaji T K <balajitk@ti.com>
Subject: Re: [PATCH] mmc: omap_hsmmc: Add small delay after enabling power
Date: Fri, 12 Sep 2014 09:26:54 +0200	[thread overview]
Message-ID: <5412A03E.8060307@denx.de> (raw)
In-Reply-To: <CAPDyKFp9JKb=XOo5m7YQEQFbF4Rtn_DKP2ia3jCBMhRa6aJVZQ@mail.gmail.com>

On 11.09.2014 16:15, Ulf Hansson wrote:
> On 11 September 2014 16:11, Stefan Roese <sr@denx.de> wrote:
>> From: Thorsten Einsbein <thorsten.eisbein@head-acoustics.de>
>>
>> On the TAO3530 (OMAP3530 based) we noticed that some SD cards are not
>> detected reliably upon bootup (timeout). Especially the SanDisk Ultra
>> 8GiB seems to be problematic here. The SanDisk Extreme also has this
>> problem on this platform, but not that often. A Samsung 8 GiB type 6
>> doesn't show this problem at all.
>>
>> This patch now adds a short delay after enabling the power on the slot.
>> With this delay all cards are detected reliably.
>
> Is this delay related to regulator ramp up/down time? Then I think it
> maybe should be a part of the regulator code/DT.

Thanks for this feedback. Yes, adding "regulator-enable-ramp-delay" to 
the regulator(s) solves this issue too. I wasn't aware of that one.

The patch can be dropped.

Thanks,
Stefan


      reply	other threads:[~2014-09-12  7:26 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-11 14:11 [PATCH] mmc: omap_hsmmc: Add small delay after enabling power Stefan Roese
2014-09-11 14:15 ` Ulf Hansson
2014-09-12  7:26   ` Stefan Roese [this message]

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