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

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Date:	Wed, 13 May 2015 22:14:26 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Kevin Hilman <khilman@...nel.org>
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@...ts.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

On Wed, May 13, 2015 at 07:33:54AM -0700, Kevin Hilman wrote:
> 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.

It's very odd, I actually tried with a cubie2 here...

I'm booting on an initramfs and not MMC though, but I can't see how
that can be related to our issue...

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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