linux-kernel - Re: [RFC PATCH 0/4] mmc: sdhci: Support maximum DMA latency request via PM QoS

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Message-ID: <20150325194259.GB381@amd>
Date:	Wed, 25 Mar 2015 20:43:00 +0100
From:	Pavel Machek <pavel@....cz>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Ulf Hansson <ulf.hansson@...aro.org>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Len Brown <len.brown@...el.com>,
	Kevin Hilman <khilman@...aro.org>,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/4] mmc: sdhci: Support maximum DMA latency request
 via PM QoS

Hi!

> Here are some patches to address an issue with SDHCI
> in Intel Baytrail. Intel Baytrail has been observed
> sometimes to hang if host controllers are using DMA
> while deep C-states are used. Workaround that by

I wonder if there is more information on this one? I see your address
is "@intel". For example which C states are affected, and if there's
maybe Intel errata number to quote?
									Pavel
-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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