From: Michal Suchanek <hramrach@gmail.com>
To: megous@megous.com
Cc: "Jean-Francois Moine" <moinejf@free.fr>,
"Maxime Ripard" <maxime.ripard@free-electrons.com>,
"Mark Rutland" <mark.rutland@arm.com>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@vger.kernel.org>, dev <dev@linux-sunxi.org>,
"Michael Turquette" <mturquette@baylibre.com>,
"Stephen Boyd" <sboyd@codeaurora.org>,
"open list" <linux-kernel@vger.kernel.org>,
"Emilio López" <emilio@elopez.com.ar>,
"Chen-Yu Tsai" <wens@csie.org>,
"Rob Herring" <robh+dt@kernel.org>,
"open list:COMMON CLK FRAMEWORK" <linux-clk@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [linux-sunxi] Re: [PATCH v2 06/14] ARM: sun8i: clk: Add clk-factor rate application method
Date: Fri, 15 Jul 2016 16:22:31 +0200 [thread overview]
Message-ID: <CAOMqctTds7adsfvehfv8wcxbb0NOpEQE5wRff6NwfPOUa3SbRw@mail.gmail.com> (raw)
In-Reply-To: <98fd2ab2-9b1d-1494-5867-7701780fd471@megous.com>
Hello,
On 15 July 2016 at 15:48, Ondřej Jirman <megous@megous.com> wrote:
>
>
> On 15.7.2016 15:27, Jean-Francois Moine wrote:
>> On Fri, 15 Jul 2016 12:38:54 +0200
>> Ondřej Jirman <megous@megous.com> wrote:
>>
>>>> If so, then yes, trying to switch to the 24MHz oscillator before
>>>> applying the factors, and then switching back when the PLL is stable
>>>> would be a nice solution.
>>>>
>>>> I just checked, and all the SoCs we've had so far have that
>>>> possibility, so if it works, for now, I'd like to stick to that.
>>>
>>> It would need to be tested. U-boot does the change only once, while the
>>> kernel would be doing it all the time and between various frequencies
>>> and PLL settings. So the issues may show up with this solution too.
>>
>> I don't think this is a good idea: the CPU clock may be changed at any
>> time with the CPUFreq governor. I don't see the system moving from
>> 1008MHz to 24MHz and then to 1200MHz when some computation is needed!
>
> PLL lock time is around 10-20us, I'd guess based on the number of loops
> in the PLL lock wait loop. So unless you'll be switching frequencies
> many times per second, this should be barely noticeable.
>
> But I'd like a different solution too.
Do you have a patch to test this?
For me changing CPU frequency on Orange Pi One always locks up the
system. I keep running it on the u-boot setup 1.08GHz at 1.1V
Thanks
Michal
next prev parent reply other threads:[~2016-07-15 14:22 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20160625034511.7966-1-megous@megous.com>
[not found] ` <20160625034511.7966-1-megous-5qf/QAjKc83QT0dZR+AlfA@public.gmane.org>
2016-06-25 3:44 ` [PATCH v2 01/14] ARM: clk: sunxi: Add driver for the H3 THS clock megous-5qf/QAjKc83QT0dZR+AlfA
[not found] ` <20160625034511.7966-2-megous-5qf/QAjKc83QT0dZR+AlfA@public.gmane.org>
2016-06-25 7:13 ` Maxime Ripard
2016-06-25 15:23 ` Ondřej Jirman
[not found] ` <6a37450f-35fe-3296-da4b-10f7d645e2b9-5qf/QAjKc83QT0dZR+AlfA@public.gmane.org>
2016-06-28 11:52 ` Maxime Ripard
2016-06-25 3:45 ` [PATCH v2 03/14] dt-bindings: document sun8i_ths - H3 thermal sensor driver megous-5qf/QAjKc83QT0dZR+AlfA
[not found] ` <20160625034511.7966-4-megous-5qf/QAjKc83QT0dZR+AlfA@public.gmane.org>
2016-06-28 20:56 ` Rob Herring
2016-06-25 3:45 ` [PATCH v2 05/14] dt-bindings: document SY8106A regulator driver megous-5qf/QAjKc83QT0dZR+AlfA
[not found] ` <20160625034511.7966-6-megous-5qf/QAjKc83QT0dZR+AlfA@public.gmane.org>
2016-06-26 11:27 ` Mark Brown
[not found] ` <20160626112720.GL28202-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2016-06-26 15:10 ` Ondřej Jirman
[not found] ` <e8508fa7-bd98-9171-0c9a-59e059573692-5qf/QAjKc83QT0dZR+AlfA@public.gmane.org>
2016-06-26 18:52 ` Mark Brown
2016-06-25 3:45 ` [PATCH v2 06/14] ARM: sun8i: clk: Add clk-factor rate application method megous-5qf/QAjKc83QT0dZR+AlfA
[not found] ` <20160625034511.7966-7-megous-5qf/QAjKc83QT0dZR+AlfA@public.gmane.org>
2016-06-30 20:40 ` Maxime Ripard
2016-07-01 0:50 ` Ondřej Jirman
2016-07-01 5:37 ` Jean-Francois Moine
[not found] ` <20160701073710.1a1fc684ae448577bad5b0db-GANU6spQydw@public.gmane.org>
2016-07-01 6:34 ` Ondřej Jirman
[not found] ` <643c2648-ddd6-700a-68c0-2981134965c0-5qf/QAjKc83QT0dZR+AlfA@public.gmane.org>
2016-07-01 7:47 ` Jean-Francois Moine
[not found] ` <0b71ed7e-98c9-109e-85e6-ceb95131d88a-5qf/QAjKc83QT0dZR+AlfA@public.gmane.org>
2016-07-15 8:53 ` Maxime Ripard
2016-07-15 10:38 ` Ondřej Jirman
2016-07-15 13:27 ` Jean-Francois Moine
[not found] ` <20160715152756.db7375a7109fed18c2fbf43a-GANU6spQydw@public.gmane.org>
2016-07-15 13:48 ` Ondřej Jirman
2016-07-15 14:22 ` Michal Suchanek [this message]
2016-07-15 16:33 ` [linux-sunxi] " Ondřej Jirman
2016-07-21 9:51 ` Maxime Ripard
[not found] ` <085e185a-ac76-dd3f-9b0e-a7dc9c0c09f3-5qf/QAjKc83QT0dZR+AlfA@public.gmane.org>
2016-07-21 9:48 ` Maxime Ripard
2016-07-21 9:52 ` Ondřej Jirman
2016-07-26 6:32 ` Maxime Ripard
2016-07-28 11:27 ` Changed: sunxi-ng clock code - NKMP clock implementation is wrong Ondřej Jirman
2016-07-28 11:38 ` [linux-sunxi] " Chen-Yu Tsai
[not found] ` <e1b8127f-c422-46ab-384b-aeee85aa940b-5qf/QAjKc83QT0dZR+AlfA@public.gmane.org>
2016-07-28 21:00 ` Maxime Ripard
2016-07-28 22:01 ` Ondřej Jirman
[not found] ` <7c5f2835-f044-7c18-def9-52af5ce4afc3-5qf/QAjKc83QT0dZR+AlfA@public.gmane.org>
2016-07-31 10:31 ` Maxime Ripard
2016-07-31 22:01 ` Ondřej Jirman
[not found] ` <9175af7e-e1b1-df88-de2b-16f0e8d719c1-5qf/QAjKc83QT0dZR+AlfA@public.gmane.org>
2016-08-31 20:25 ` Maxime Ripard
2016-07-01 0:53 ` [PATCH v2 06/14] ARM: sun8i: clk: Add clk-factor rate application method Ondřej Jirman
[not found] ` <64d0c1e2-d818-0806-7c92-c10603b4f6f5-5qf/QAjKc83QT0dZR+AlfA@public.gmane.org>
2016-07-15 8:19 ` Maxime Ripard
2016-06-25 3:45 ` [PATCH v2 07/14] ARM: dts: sun8i: Use sun8i-h3-pll1-clk for pll1 in H3 megous-5qf/QAjKc83QT0dZR+AlfA
2016-06-25 3:45 ` [PATCH v2 08/14] ARM: dts: sun8i: Add thermal sensor node to the sun8i-h3.dtsi megous-5qf/QAjKc83QT0dZR+AlfA
2016-06-25 3:45 ` [PATCH v2 09/14] ARM: dts: sun8i: Add cpu0 label to sun8i-h3.dtsi megous-5qf/QAjKc83QT0dZR+AlfA
2016-06-25 3:45 ` [PATCH v2 10/14] ARM: dts: sun8i: Add r_twi I2C controller megous-5qf/QAjKc83QT0dZR+AlfA
[not found] ` <20160625034511.7966-11-megous-5qf/QAjKc83QT0dZR+AlfA@public.gmane.org>
2016-06-25 7:16 ` Maxime Ripard
2016-06-25 3:45 ` [PATCH v2 11/14] ARM: dts: sun8i: Add sy8106a regulator to Orange Pi PC megous-5qf/QAjKc83QT0dZR+AlfA
2016-06-25 3:45 ` [PATCH v2 12/14] ARM: dts: sun8i: Setup CPU operating points for Onrage PI PC megous-5qf/QAjKc83QT0dZR+AlfA
2016-06-25 3:45 ` [PATCH v2 13/14] ARM: dts: sun8i: Add gpio-regulator used on Orange Pi One megous-5qf/QAjKc83QT0dZR+AlfA
[not found] ` <20160625034511.7966-14-megous-5qf/QAjKc83QT0dZR+AlfA@public.gmane.org>
2016-06-25 7:18 ` Maxime Ripard
2016-06-25 3:45 ` [PATCH v2 14/14] ARM: dts: sun8i: Enable DVFS " megous-5qf/QAjKc83QT0dZR+AlfA
2016-06-30 11:13 ` [linux-sunxi] " Michal Suchanek
[not found] ` <CAOMqctTe==M1SXxbdR8y33yh51fiFGn+oSaKJXhbnpLVTn-New-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-06-30 14:19 ` Ondřej Jirman
[not found] ` <834b8045-d99f-74a3-0353-aa84b897351d-5qf/QAjKc83QT0dZR+AlfA@public.gmane.org>
2016-06-30 15:16 ` Michal Suchanek
[not found] ` <CAOMqctSbJOB67a=LiCZVUb-wUMCpeJPd81OL5epYkC2p5X1T-g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-06-30 15:32 ` Ondřej Jirman
2016-06-30 15:50 ` Michal Suchanek
[not found] ` <CAOMqctR+SBfo9UZxXuACz858ehXpa2jGHZw_-70dbUFX3Q_0CQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-06-30 15:53 ` Ondřej Jirman
2016-07-01 10:54 ` Michal Suchanek
2016-06-30 14:23 ` Siarhei Siamashka
2016-07-01 1:17 ` Ondřej Jirman
2016-07-22 0:41 ` Ondřej Jirman
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAOMqctTds7adsfvehfv8wcxbb0NOpEQE5wRff6NwfPOUa3SbRw@mail.gmail.com \
--to=hramrach@gmail.com \
--cc=dev@linux-sunxi.org \
--cc=devicetree@vger.kernel.org \
--cc=emilio@elopez.com.ar \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-clk@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mark.rutland@arm.com \
--cc=maxime.ripard@free-electrons.com \
--cc=megous@megous.com \
--cc=moinejf@free.fr \
--cc=mturquette@baylibre.com \
--cc=robh+dt@kernel.org \
--cc=sboyd@codeaurora.org \
--cc=wens@csie.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).