From: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
To: myungjoo.ham@samsung.com
Cc: 최찬우 <cw00.choi@samsung.com>,
"Tobias Jakobi" <liquid.acid@gmx.net>,
kgene@kernel.org, 박경민 <kyungmin.park@samsung.com>,
rafael.j.wysocki@intel.com, mark.rutland@arm.com,
"ABHILASH KESAVAN" <a.kesavan@samsung.com>,
tomasz.figa@gmail.com,
"Krzysztof Kozlowski" <k.kozlowski@samsung.com>,
"Bartlomiej Zolnierkiewicz" <b.zolnierkie@samsung.com>,
robh+dt@kernel.org, 대인기 <inki.dae@samsung.com>,
linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-samsung-soc@vger.kernel.org
Subject: Re: Re: [PATCHv3 0/8] devfreq: Add generic exynos memory-bus frequency driver
Date: Tue, 24 Feb 2015 13:22:41 +0100 [thread overview]
Message-ID: <3d11219e3af0d964bd6396c6be320276@math.uni-bielefeld.de> (raw)
In-Reply-To: <473523680.35451424740978095.JavaMail.weblogic@epmlwas05a>
Hello MyungJoo!
On 2015-02-24 02:22, MyungJoo Ham wrote:
> Unless you are willing to wait for 2 minutes after the kernal hangs,
> you may want to adjust "DEFAULT_HUNG_TASK_TIMEOUT" to shorter value
> (120 --> 5 for 5 seconds). It seems that you've cut it off in the
> middle
> of that "120 sec" wait.
Thanks for the hint! Yes, I should probably adjust this value when
doing more tests.
> If it's in D state (in kernel), gdb won't work as you are experiencing.
> Sorry for not testing with HDMI; my Exynos devices do not have HDMI. :)
Well, like I said above, the HDMI doesn't seen to be affected by the low
MIF/INT clocks. I have tested this with 1280x720 here on my Odroid X2,
but I also have another user (with a U3 if I remember correctly) who
also confirms that HDMI is working in combination with devfreq and
simple_ondemand.
I guess it's just the G2D engine that doesn't like the low clocks. Maybe
it also affects the IPP subsystem, but I have no means to test this.
With best wishes,
Tobias
prev parent reply other threads:[~2015-02-24 12:22 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-24 1:23 Re: [PATCHv3 0/8] devfreq: Add generic exynos memory-bus frequency driver MyungJoo Ham
2015-02-24 12:22 ` Tobias Jakobi [this message]
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