From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas-Karl Pietrowski Subject: Re: Feedback on hardware support for Odroid U3 Date: Sat, 13 Jun 2015 11:11:54 +0200 Message-ID: <16487700.5L20qaootX@home> References: <557BC91C.10007@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mail-wi0-f170.google.com ([209.85.212.170]:35929 "EHLO mail-wi0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751758AbbFMJL7 convert rfc822-to-8bit (ORCPT ); Sat, 13 Jun 2015 05:11:59 -0400 Received: by wigg3 with SMTP id g3so34253668wig.1 for ; Sat, 13 Jun 2015 02:11:58 -0700 (PDT) In-Reply-To: <557BC91C.10007@gmail.com> Sender: linux-samsung-soc-owner@vger.kernel.org List-Id: linux-samsung-soc@vger.kernel.org To: Krzysztof Kozlowski Cc: linux-samsung-soc@vger.kernel.org Am Samstag, 13. Juni 2015, 15:09:32 schrieb Krzysztof Kozlowski: > W dniu 12.06.2015 o 22:53, Thomas Pietrowski pisze: > > Hello again, > >=20 > > first after fixing my booting problems I now get different warnings= after > > boot. - config: http://pastebin.com/MHUu51pF > > - log: http://pastebin.com/9YMgMmFL > > - repo: arm-soc > > I read the last days that you are still working on the clk drivers,= so > > as these warnings appear to be related to that you might be interes= ted > > on them. >=20 > You mean the warnings on clocks (starting from runtime PM and FIMC)? = I > hit them also on Trats2. Just need to find a person (or time) who wil= l > fix it... > Ok then. I just don't remember that I had them when using 3.19.x code b= y=20 Tobias Jakobi before. I'll test his latest code later. The reason I wan= ted to=20 use code from arm-soc is that I thought his changes/patches are already= here=20 after two linux releases. However, in the past the CPU fan wasn't worki= ng at=20 all (0 RPM) and /sys/class/thermal/[...]/temp reported more than 70=B0C= (was=20 compiling a newer kernel code at this moment). Don't believe it was hea= lthy. > > Additionally my CPU fan it running at full RPM all the time. I chec= ked > > the temperature just to be sure and it says it's 20=B0C. Is this pr= oblem > > known or can I help debugging it? >=20 > After quick look at DTS, I think that on Exynos4412 Odroid family the= re > is no fan defined. No fan so cooling is done only through CPU > frequencies. The fan probably works on default setting from bootloade= r > or default register values. >=20 Just something at this point which comes to my mind. Imagine we have th= e fan=20 regulation/driver working. What happens when we simply disconnect the f= an and=20 the CPU hits higher temperatures? Will it still work on high frequencie= s or=20 will it self-protect by using lower CPU frequencies? CPU throttling and CPU cooling should be two seperate processes, isn't = it? > The stock Odroid U3 has only passive cooler. >=20 That's true, but they (hardkernel) also sell a optional fan and the soc= ket for=20 is is still there when buying the board. See,=20 http://www.hardkernel.com/main/products/prdt_info.php?g_code=3DG1387603= 58261 for=20 the optional fan. Therefore, it is not a hardware hack or whatever. > Probably support for fan could be added... If you would like to take > care of it, go for it! :) >=20 I just browsed Tobias Jakobi's "linux-odroid" repository at github and = found=20 out, that work is already made on that by people at Samsung :) https://github.com/tobiasjakobi/linux-odroid/commit/a2236c8f74321357e50= 5be0a054032325a7e3a5d Hopefully both are also in this mailing list and interested in getting = this=20 upstream. In the mean time I'll test it based on tobiasjakobi's codebas= e=20 again. Regards, Thomas