linux-kernel - Re: [PATCH v3 0/2] clk: improve handling of orphan clocks

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Message-ID: <7hiobw8s31.fsf@deeprootsystems.com>
Date:	Wed, 13 May 2015 07:33:54 -0700
From:	Kevin Hilman <khilman@...nel.org>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	Stephen Boyd <sboyd@...eaurora.org>,
	Heiko Stübner <heiko@...ech.de>,
	Mike Turquette <mturquette@...aro.org>,
	Doug Anderson <dianders@...omium.org>,
	linux-clk@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel\@lists.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Alex Elder <elder@...aro.org>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Max Filippov <jcmvbkbc@...il.com>,
	Sascha Hauer <kernel@...gutronix.de>,
	Zhangfei Gao <zhangfei.gao@...aro.org>,
	Santosh Shilimkar <ssantosh@...nel.org>,
	Chao Xie <chao.xie@...vell.com>,
	Jason Cooper <jason@...edaemon.net>,
	Stefan Wahren <stefan.wahren@...e.com>,
	Andrew Bresticker <abrestic@...omium.org>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	Georgi Djakov <georgi.djakov@...aro.org>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Barry Song <baohua@...nel.org>,
	Dinh Nguyen <dinguyen@...nsource.altera.com>,
	Viresh Kumar <viresh.linux@...il.com>,
	Gabriel FERNANDEZ <gabriel.fernandez@...com>,
	Emilio López 
	<emilio@...pez.com.ar>,
	Peter De Sc hrijver <pdeschrijver@...dia.com>,
	Tero Kristo <t-kristo@...com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Pawel Moll <pawel.moll@....com>,
	Michal Simek <michal.simek@...inx.com>,
	Olof Johansson <olof@...om.net>,
	Tyler Baker <tyler.baker@...aro.org>
Subject: Re: [PATCH v3 0/2] clk: improve handling of orphan clocks

Maxime Ripard <maxime.ripard@...e-electrons.com> writes:

> On Tue, May 12, 2015 at 03:35:50PM -0700, Stephen Boyd wrote:
>> On 05/08/15 03:02, Maxime Ripard wrote:
>> > On Thu, May 07, 2015 at 02:03:57PM -0700, Stephen Boyd wrote:
>> >> On 05/07/15 08:17, Kevin Hilman wrote:
>> >>> On Fri, May 1, 2015 at 4:40 PM, Stephen Boyd <sboyd@...eaurora.org> wrote:
>> >>>> On 05/01/15 15:07, Heiko Stübner wrote:
>> >>>>> Am Freitag, 1. Mai 2015, 13:52:47 schrieb Stephen Boyd:
>> >>>>>
>> >>>>>>> Instead I guess we could hook it less deep into clk_get_sys, like in the
>> >>>>>>> following patch?
>> >>>>>> It looks like it will work at least, but still I'd prefer to keep the
>> >>>>>> orphan check contained to clk.c. How about this compile tested only patch?
>> >>>>> I gave this a spin on my rk3288-firefly board. It still boots, the clock tree
>> >>>>> looks the same and it also still defers nicely in the scenario I needed it
>> >>>>> for. The implementation also looks nice - and of course much more compact than
>> >>>>> my check in two places :-) . I don't know if you want to put this as follow-up
>> >>>>> on top or fold it into the original orphan-check, so in any case
>> >>>>>
>> >>>>> Tested-by: Heiko Stuebner <heiko@...ech.de>
>> >>>>> Reviewed-by: Heiko Stuebner <heiko@...ech.de>
>> >>>> Thanks. I'm leaning towards tossing your patch 2/2 and replacing it with
>> >>>> my patch and a note that it's based on an earlier patch from you.
>> >>> It appears this has landed in linux-next in the form of 882667c1fcf1
>> >>> clk: prevent orphan clocks from being used.  A bunch of boot failures
>> >>> for sunxi in today's linux-next[1] were bisected down to that patch.
>> >>>
>> >>> I confirmed that reverting that commit on top of next/master gets
>> >>> sunxi booting again.
>> >>>
>> >>>
>> >> Thanks for the report. I've removed the two clk orphan patches from
>> >> clk-next. Would it be possible to try with next-20150507 and
>> >> clk_ignore_unused on the command line?
>> > This makes it work, but it's not really an option.
>> >
>> 
>> Hmm.. I thought it didn't fix it for Kevin. Confused.
>
> I'm too, but it does fix things here.

To be more precise on what I tested.  I used next-20150507 and tested on
4 different sunxi platforms.  First test was "normal" commandline,
second was with clk_ignore_unused appended:

  - cubie: fail, fail
  - cubie2: fail, fail
  - bananpi: fail, pass
  - cubietruck: fail, pass

So it seems to have some effect, but by itself, doesn't fix the issue.

Kevin
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