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

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Message-ID: <20150326095117.GA637@amd>
Date:	Thu, 26 Mar 2015 10:51:17 +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

On Thu 2015-03-26 10:29:06, Adrian Hunter wrote:
> On 25/03/15 21:43, Pavel Machek wrote:
> > 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
> 
> The problem starts at C6 - I will add that to the commit message.

Better find a place for a comment in code, too...

Thanks,
									Pavel
-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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