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From: Sascha Hauer <s.hauer@pengutronix.de>
To: Markus Niebel <list-09_barebox@tqsc.de>
Cc: barebox@lists.infradead.org, Markus Niebel <Markus.Niebel@tqs.de>
Subject: Re: [PATCH / RFC] MCI: imx-esdhc: implement workaround for errata ENGcm12360
Date: Tue, 10 Sep 2013 08:57:34 +0200	[thread overview]
Message-ID: <20130910065734.GB30088@pengutronix.de> (raw)
In-Reply-To: <1378387880-3844-1-git-send-email-list-09_barebox@tqsc.de>

Hi Markus,

On Thu, Sep 05, 2013 at 03:31:20PM +0200, Markus Niebel wrote:
> From: Markus Niebel <Markus.Niebel@tqs.de>
> 
> Signed-off-by: Markus Niebel <Markus.Niebel@tqs.de>
> 
> At least i.MX53 has errata ENGcm12360:
> 
> Occurs when a pending command which issues busy is completed.
> For a command with R1b response, the proper software sequence
> is to poll the DLA for R1b commands to determine busy
> state completion. The DLA polling is not working properly for
> the ESDHC module. This is relevant for all eSDHC ports (eSDHC1-4 ports)
> 
> DLA bit in PRSSTAT register cannot be
> polled to wait for busy state completion.
> 
> Updated block guide to reflect that DLA is not applicable to detect
> busy state, instead, should poll bit 24 in PRSSTAT register (DLSL[0] bit)
> to check that wait busy state is over.

I'll give it a try in the -next branch. The patch looks as if it is safe
on other SoCs, but let's see.

Sascha

-- 
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      reply	other threads:[~2013-09-10  6:57 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-09-05 13:31 Markus Niebel
2013-09-10  6:57 ` Sascha Hauer [this message]

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