linux-kernel - Re: Re: [PATCHv3 0/8] devfreq: Add generic exynos memory-bus frequency driver

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Date:	Tue, 24 Feb 2015 13:22:41 +0100
From:	Tobias Jakobi <tjakobi@...h.uni-bielefeld.de>
To:	myungjoo.ham@...sung.com
Cc:	최찬우 <cw00.choi@...sung.com>,
	Tobias Jakobi <liquid.acid@....net>, kgene@...nel.org,
	박경민 
	<kyungmin.park@...sung.com>, rafael.j.wysocki@...el.com,
	mark.rutland@....com, ABHILASH KESAVAN <a.kesavan@...sung.com>,
	tomasz.figa@...il.com,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	robh+dt@...nel.org,
	대인기 
	<inki.dae@...sung.com>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org
Subject: Re: Re: [PATCHv3 0/8] devfreq: Add generic exynos memory-bus
 frequency driver

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

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