linux-kernel - Re: [PATCH 6/8] ARM: mvebu: enable SDHCI card detection using DAT3 pin on A388-GP

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Message-ID: <CAPv3WKeUQ6rsYWJ3C+aX8eHTAdS4SmQ3oCjA9feFf+d-n1RvhA@mail.gmail.com>
Date:	Tue, 6 Oct 2015 09:02:25 +0200
From:	Marcin Wojtas <mw@...ihalf.com>
To:	Andrew Lunn <andrew@...n.ch>
Cc:	linux-kernel@...r.kernel.org,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Jason Cooper <jason@...edaemon.net>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Gregory Clément 
	<gregory.clement@...e-electrons.com>, nadavh@...vell.com,
	Lior Amsalem <alior@...vell.com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Grzegorz Jaszczyk <jaz@...ihalf.com>
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 <andrew@...n.ch>:
> 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
think?

Best regards,
Marcin
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