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

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Message-ID: <5513C352.2080208@intel.com>
Date:	Thu, 26 Mar 2015 10:29:06 +0200
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Pavel Machek <pavel@....cz>
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 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.

> maybe Intel errata number to quote?

I wasn't able to find an errata number.

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