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Date:	Tue, 6 Oct 2015 09:02:25 +0200
From:	Marcin Wojtas <>
To:	Andrew Lunn <>
	"" <>,
	Ulf Hansson <>,
	Sebastian Hesselbarth <>,
	Jason Cooper <>,
	Thomas Petazzoni <>,
	Gregory Clément 
	Lior Amsalem <>,
	Tawfik Bayouk <>,
	Grzegorz Jaszczyk <>
Subject: Re: [PATCH 6/8] ARM: mvebu: enable SDHCI card detection using DAT3
 pin on A388-GP

Hi Andrew,

2015-10-06 5:31 GMT+02:00 Andrew Lunn <>:
> On Tue, Oct 06, 2015 at 03:22:40AM +0200, Marcin Wojtas wrote:
>> The newest revisions of A388-GP (v1.5 and higher) support only
>> DAT3-based card detection, which is enabled by this commit. Hitherto
>> revisions, without such modification, will be impacted with a broken
>> card detection - in order to operate the cards have to be present
>> during kernel boot.
> Humm. Is this acceptable, breaking old boards?
> I would say at minimum, there should be a big fat comment at the top
> of armada-388-gp.dts explaining that this DTS file is broken on
> v0.0-v1.4.
> Or we have two .dts files for the 388-gp file, and a dtsi file.

I expected this patch would be controversial, hence I propose a
compromise: set A388-GP SDHCI to 'broken-cd' by defeault. However
Marvell insisted on HW card detection, because software polling spoils
the SD/MMC benchmarks, but this way the user would decide whether to
stay with broken-cd or switch to GPIO/DAT3 detection. What do you

Best regards,
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